Publish

- @0x/contracts-asset-proxy@3.0.0
 - @0x/contracts-coordinator@3.0.0
 - @0x/contracts-dev-utils@1.0.0
 - @0x/contracts-erc1155@2.0.0
 - @0x/contracts-erc20-bridge-sampler@1.0.0
 - @0x/contracts-erc20@3.0.0
 - @0x/contracts-erc721@3.0.0
 - @0x/contracts-exchange-forwarder@4.0.0
 - @0x/contracts-exchange-libs@4.0.0
 - @0x/contracts-exchange@3.0.0
 - @0x/contracts-extensions@5.0.0
 - @0x/contracts-integrations@2.0.0
 - @0x/contracts-multisig@4.0.0
 - @0x/contracts-staking@2.0.0
 - @0x/contracts-test-utils@4.0.0
 - @0x/contracts-tests@0.0.6
 - @0x/contracts-utils@4.0.0
 - 0x.js@9.0.0
 - @0x/abi-gen@5.0.0
 - @0x/assert@3.0.0
 - @0x/asset-swapper@3.0.0
 - @0x/base-contract@6.0.0
 - @0x/connect@6.0.0
 - @0x/contract-addresses@4.0.0
 - @0x/contract-artifacts@3.0.0
 - @0x/contract-wrappers-test@12.2.1
 - @0x/contract-wrappers@13.0.0
 - @0x/contracts-gen@2.0.0
 - @0x/dev-utils@3.0.0
 - ethereum-types@3.0.0
 - @0x/instant@1.0.37
 - @0x/json-schemas@5.0.0
 - @0x/migrations@5.0.0
 - @0x/monorepo-scripts@1.0.43
 - @0x/order-utils@9.0.0
 - @0x/orderbook@1.0.0
 - @0x/sol-compiler@4.0.0
 - @0x/sol-coverage@4.0.0
 - @0x/sol-doc@3.0.0
 - @0x/sol-profiler@4.0.0
 - @0x/sol-resolver@3.0.0
 - @0x/sol-trace@3.0.0
 - @0x/sol-tracing-utils@7.0.0
 - @0x/sra-spec@3.0.0
 - @0x/subproviders@6.0.0
 - @0x/tslint-config@4.0.0
 - @0x/types@3.0.0
 - @0x/typescript-typings@5.0.0
 - @0x/utils@5.0.0
 - @0x/web3-wrapper@7.0.0

.circleci/config.yml

@@ -37,7 +37,7 @@ jobs:
             - store_artifacts:
                   path: ~/repo/packages/abi-gen/test-cli/output
             - store_artifacts:
-                  path: ~/repo/packages/abi-gen-wrappers/generated_docs
+                  path: ~/repo/packages/contract-wrappers/generated_docs
     test-contracts-ganache:
         resource_class: medium+
         docker:
@@ -77,7 +77,7 @@ jobs:
             - restore_cache:
                   keys:
                       - repo-{{ .Environment.CIRCLE_SHA1 }}
-            - run: yarn wsrun test:circleci @0x/contracts-multisig @0x/contracts-utils @0x/contracts-exchange-libs @0x/contracts-erc20 @0x/contracts-erc721 @0x/contracts-erc1155 @0x/contracts-asset-proxy @0x/contracts-exchange-forwarder @0x/contracts-tests @0x/contracts-staking @0x/contracts-coordinator
+            - run: yarn wsrun test:circleci @0x/contracts-multisig @0x/contracts-utils @0x/contracts-exchange-libs @0x/contracts-erc20 @0x/contracts-erc721 @0x/contracts-erc1155 @0x/contracts-asset-proxy @0x/contracts-exchange-forwarder @0x/contracts-tests @0x/contracts-staking @0x/contracts-coordinator @0x/contracts-erc20-bridge-sampler 
             # TODO(dorothy-zbornak): Re-enable after updating this package for
             # 3.0. At that time, also remove exclusion from monorepo
             # package.json's test script.
@@ -93,8 +93,8 @@ jobs:
                   keys:
                       - repo-{{ .Environment.CIRCLE_SHA1 }}
             - run:
-                command: yarn test:publish:circleci
-                no_output_timeout: 1800
+                  command: yarn test:publish:circleci
+                  no_output_timeout: 1800
     test-doc-generation:
         docker:
             - image: nikolaik/python-nodejs:python3.7-nodejs8
@@ -104,8 +104,8 @@ jobs:
                   keys:
                       - repo-{{ .Environment.CIRCLE_SHA1 }}
             - run:
-                command: yarn test:generate_docs:circleci
-                no_output_timeout: 1200
+                  command: yarn test:generate_docs:circleci
+                  no_output_timeout: 1200
     test-rest:
         docker:
             - image: nikolaik/python-nodejs:python3.7-nodejs8
@@ -116,23 +116,16 @@ jobs:
                       - repo-{{ .Environment.CIRCLE_SHA1 }}
             - run: yarn wsrun test:circleci @0x/contracts-test-utils
             - run: yarn wsrun test:circleci @0x/abi-gen
-            # TODO (xianny): Needs to be updated for 3.0
-            # - run: yarn wsrun test:circleci @0x/asset-buyer
-            # TODO: Needs to be updated for 3.0.  At that time, also remove
-            # exclusion from monorepo package.json's test script.
-            # - run: yarn wsrun test:circleci @0x/asset-swapper
+            - run: yarn wsrun test:circleci @0x/asset-swapper
             - run: yarn wsrun test:circleci @0x/contract-artifacts
             - run: yarn wsrun test:circleci @0x/assert
             - run: yarn wsrun test:circleci @0x/base-contract
-            # TODO (xianny): Needs to be updated for 3.0
-            # - run: yarn wsrun test:circleci @0x/connect
-            - run: yarn wsrun test:circleci @0x/contract-wrappers
+            - run: yarn wsrun test:circleci @0x/connect
+            - run: yarn wsrun test:circleci @0x/contract-wrappers-test
             - run: yarn wsrun test:circleci @0x/dev-utils
             - run: yarn wsrun test:circleci @0x/json-schemas
             - run: yarn wsrun test:circleci @0x/order-utils
-            # TODO: Needs to be updated for 3.0. At that time, also remove
-            # exclusion from monorepo package.json's test script.
-            # - run: yarn wsrun test:circleci @0x/orderbook
+            - run: yarn wsrun test:circleci @0x/orderbook
             - run: yarn wsrun test:circleci @0x/sol-compiler
             - run: yarn wsrun test:circleci @0x/sol-tracing-utils
             - run: yarn wsrun test:circleci @0x/sol-doc
@@ -149,9 +142,9 @@ jobs:
                   paths:
                       - ~/repo/packages/assert/coverage/lcov.info
             - save_cache:
-                  key: coverage-asset-buyer-{{ .Environment.CIRCLE_SHA1 }}
+                  key: coverage-asset-swapper-{{ .Environment.CIRCLE_SHA1 }}
                   paths:
-                      - ~/repo/packages/asset-buyer/coverage/lcov.info
+                      - ~/repo/packages/asset-swapper/coverage/lcov.info
             - save_cache:
                   key: coverage-base-contract-{{ .Environment.CIRCLE_SHA1 }}
                   paths:
@@ -161,9 +154,9 @@ jobs:
                   paths:
                       - ~/repo/packages/connect/coverage/lcov.info
             - save_cache:
-                  key: coverage-contract-wrappers-{{ .Environment.CIRCLE_SHA1 }}
+                  key: coverage-contract-wrappers-test-{{ .Environment.CIRCLE_SHA1 }}
                   paths:
-                      - ~/repo/packages/contract-wrappers/coverage/lcov.info
+                      - ~/repo/packages/contract-wrappers-test/coverage/lcov.info
             - save_cache:
                   key: coverage-dev-utils-{{ .Environment.CIRCLE_SHA1 }}
                   paths:
@@ -202,9 +195,9 @@ jobs:
             - image: nikolaik/python-nodejs:python3.7-nodejs8
             - image: 0xorg/ganache-cli:4.4.0-beta.1
               environment:
-                  VERSION: 4.4.0-beta.1
+                  VERSION: latest
                   SNAPSHOT_NAME: 0x_ganache_snapshot-v3-beta
-            - image: 0xorg/mesh:6.0.0-beta-0xv3
+            - image: 0xorg/mesh:0xV3
               environment:
                   ETHEREUM_RPC_URL: 'http://localhost:8545'
                   ETHEREUM_NETWORK_ID: '50'
@@ -369,7 +362,7 @@ jobs:
                       - coverage-assert-{{ .Environment.CIRCLE_SHA1 }}
             - restore_cache:
                   keys:
-                      - coverage-asset-buyer-{{ .Environment.CIRCLE_SHA1 }}
+                      - coverage-asset-swapper-{{ .Environment.CIRCLE_SHA1 }}
             - restore_cache:
                   keys:
                       - coverage-base-contract-{{ .Environment.CIRCLE_SHA1 }}
@@ -378,7 +371,7 @@ jobs:
                       - coverage-connect-{{ .Environment.CIRCLE_SHA1 }}
             - restore_cache:
                   keys:
-                      - coverage-contract-wrappers-{{ .Environment.CIRCLE_SHA1 }}
+                      - coverage-contract-wrappers-test-{{ .Environment.CIRCLE_SHA1 }}
             - restore_cache:
                   keys:
                       - coverage-dev-utils-{{ .Environment.CIRCLE_SHA1 }}

.github/autolabeler.yml

@@ -19,13 +19,12 @@ contracts: ['contracts']
 @0x/sol-tracing-utils: ['packages/sol-tracing-utils']
 @0x/utils: ['packages/utils']
 @0x/tslint-config: ['packages/tslint-config']
-@0x/asset-buyer: ['packages/asset-buyer']
+@0x/asset-swapper: ['packages/asset-swapper']
 @0x/order-utils: ['packages/order-utils']
 @0x/assert: ['packages/assert']
 @0x/base-contract: ['packages/base-contract']
 @0x/typescript-typings: ['packages/typescript-typings']
 0x.js: ['packages/0x.js']
-@0x/abi-gen-wrappers: ['packages/abi-gen-wrappers']
 @0x/contract-artifacts: ['packages/contract-artifacts']
 @0x/dev-utils: ['packages/dev-utils']
 @0x/contract-wrappers: ['packages/contract-wrappers']

.gitignore

@@ -79,6 +79,8 @@ TODO.md
 .vscode
 
 # generated contract artifacts/
+contracts/erc20-bridge-sampler/generated-artifacts/
+contracts/erc20-bridge-sampler/test/generated-artifacts/
 contracts/integrations/generated-artifacts/
 contracts/integrations/test/generated-artifacts/
 contracts/staking/generated-artifacts/
@@ -111,6 +113,7 @@ packages/sol-tracing-utils/test/fixtures/artifacts/
 python-packages/contract_artifacts/src/zero_ex/contract_artifacts/artifacts/
 
 # generated truffle contract artifacts/
+contracts/erc20-bridge-sampler/build/
 contracts/staking/build/
 contracts/coordinator/build/
 contracts/exchange/build/
@@ -127,6 +130,8 @@ contracts/dev-utils/build/
 
 # generated contract wrappers
 packages/python-contract-wrappers/generated/
+contracts/erc20-bridge-sampler/generated-wrappers/
+contracts/erc20-bridge-sampler/test/generated-wrappers/
 contracts/integrations/generated-wrappers/
 contracts/integrations/test/generated-wrappers/
 contracts/staking/generated-wrappers/
@@ -166,6 +171,7 @@ python-packages/contract_wrappers/src/zero_ex/contract_wrappers/dummy_erc721_tok
 python-packages/contract_wrappers/src/zero_ex/contract_wrappers/dutch_auction/__init__.py
 python-packages/contract_wrappers/src/zero_ex/contract_wrappers/erc1155_mintable/__init__.py
 python-packages/contract_wrappers/src/zero_ex/contract_wrappers/erc1155_proxy/__init__.py
+python-packages/contract_wrappers/src/zero_ex/contract_wrappers/erc20_bridge_proxy/__init__.py
 python-packages/contract_wrappers/src/zero_ex/contract_wrappers/erc20_proxy/__init__.py
 python-packages/contract_wrappers/src/zero_ex/contract_wrappers/erc721_proxy/__init__.py
 python-packages/contract_wrappers/src/zero_ex/contract_wrappers/erc721_token/__init__.py
@@ -180,6 +186,7 @@ python-packages/contract_wrappers/src/zero_ex/contract_wrappers/staking_proxy/__
 python-packages/contract_wrappers/src/zero_ex/contract_wrappers/static_call_proxy/__init__.py
 python-packages/contract_wrappers/src/zero_ex/contract_wrappers/weth9/__init__.py
 python-packages/contract_wrappers/src/zero_ex/contract_wrappers/zrx_token/__init__.py
+python-packages/contract_wrappers/src/zero_ex/contract_wrappers/zrx_vault/__init__.py
 
 # solc-bin in sol-compiler
 packages/sol-compiler/solc_bin/

.prettierignore

@@ -36,6 +36,10 @@ lib
 /contracts/erc20/test/generated-wrappers
 /contracts/erc20/generated-artifacts
 /contracts/erc20/test/generated-artifacts
+/contracts/erc20-bridge-sampler/generated-wrappers
+/contracts/erc20-bridge-sampler/test/generated-wrappers
+/contracts/erc20-bridge-sampler/generated-artifacts
+/contracts/erc20-bridge-sampler/test/generated-artifacts
 /contracts/erc721/generated-wrappers
 /contracts/erc721/test/generated-wrappers
 /contracts/erc721/generated-artifacts

CODEOWNERS

@@ -5,8 +5,8 @@
 # https://git-scm.com/docs/gitignore#_pattern_format
 
 # Website
-packages/asset-buyer/  @BMillman19 @fragosti @steveklebanoff
-packages/instant/  @BMillman19 @fragosti @steveklebanoff
+packages/asset-swapper/  @BMillman19 @fragosti @dave4506
+packages/instant/  @BMillman19 @fragosti @dave4506
 
 # Dev tools & setup
 .circleci/ @LogvinovLeon

README.md

@@ -61,11 +61,9 @@ These packages are all under development. See [/contracts/README.md](/contracts/
 | [`@0x/order-utils`](/packages/order-utils)               | [![npm](https://img.shields.io/npm/v/@0x/order-utils.svg)](https://www.npmjs.com/package/@0x/order-utils)               | A set of utilities for generating, parsing, signing and validating 0x orders                      |
 | [`@0x/json-schemas`](/packages/json-schemas)             | [![npm](https://img.shields.io/npm/v/@0x/json-schemas.svg)](https://www.npmjs.com/package/@0x/json-schemas)             | 0x-related JSON schemas                                                                           |  |
 | [`@0x/migrations`](/packages/migrations)                 | [![npm](https://img.shields.io/npm/v/@0x/migrations.svg)](https://www.npmjs.com/package/@0x/migrations)                 | Migration tool for deploying 0x smart contracts on private testnets                               |
-| [`@0x/contract-artifacts`](/packages/contract-artifacts) | [![npm](https://img.shields.io/npm/v/@0x/contract-artifacts.svg)](https://www.npmjs.com/package/@0x/contract-artifacts) | 0x smart contract compilation artifacts                                                           |
-| [`@0x/abi-gen-wrappers`](/packages/abi-gen-wrappers)     | [![npm](https://img.shields.io/npm/v/@0x/abi-gen-wrappers.svg)](https://www.npmjs.com/package/@0x/abi-gen-wrappers)     | Low-level 0x smart contract wrappers generated using `@0x/abi-gen`                                |
+| [`@0x/contract-artifacts`](/packages/contract-artifacts) | [![npm](https://img.shields.io/npm/v/@0x/contract-artifacts.svg)](https://www.npmjs.com/package/@0x/contract-artifacts) | 0x smart contract compilation artifacts                                                           |  |
 | [`@0x/sra-spec`](/packages/sra-spec)                     | [![npm](https://img.shields.io/npm/v/@0x/sra-spec.svg)](https://www.npmjs.com/package/@0x/sra-spec)                     | OpenAPI specification for the Standard Relayer API                                                |
 | [`@0x/connect`](/packages/connect)                       | [![npm](https://img.shields.io/npm/v/@0x/connect.svg)](https://www.npmjs.com/package/@0x/connect)                       | An HTTP/WS client for interacting with the Standard Relayer API                                   |
-| [`@0x/asset-buyer`](/packages/asset-buyer)               | [![npm](https://img.shields.io/npm/v/@0x/asset-buyer.svg)](https://www.npmjs.com/package/@0x/asset-buyer)               | Convenience package for discovering and buying assets with Ether                                  |
 | [`@0x/asset-swapper`](/packages/asset-swapper)           | [![npm](https://img.shields.io/npm/v/@0x/asset-swapper.svg)](https://www.npmjs.com/package/@0x/asset-swapper)           | Convenience package for discovering and performing swaps for any ERC20 Assets                     |
 
 #### Ethereum tooling

contracts/README.md

@@ -13,4 +13,4 @@
 
 #### Development
 
-Building solidity files will update the contract artifact in `{package-name}/generated-artifacts/{contract}.json`, but does not automatically update the `abi-gen-wrappers` package, which are generated from the artifact JSON. To ensure consistency, clean and rebuild `abi-gen-wrappers` after any changes to the artifact JSON.
+Building solidity files will update the contract artifact in `{package-name}/generated-artifacts/{contract}.json`, but does not automatically update the `contract-artifacts` or `contract-wrappers` packages, which are generated from the artifact JSON. See `contract-artifacts/README.md` for instructions on updating these packages.

contracts/asset-proxy/CHANGELOG.json

@@ -1,4 +1,64 @@
 [
+    {
+        "version": "3.0.0",
+        "changes": [
+            {
+                "note": "Implement `KyberBridge`.",
+                "pr": 2352
+            },
+            {
+                "note": "Drastically reduced bundle size by adding .npmignore, only exporting specific artifacts/wrappers/utils",
+                "pr": 2330
+            },
+            {
+                "note": "ERC20Wrapper and ERC1155ProxyWrapper constructors now require an instance of DevUtilsContract",
+                "pr": 2034
+            },
+            {
+                "note": "Disallow the zero address from being made an authorized address in MixinAuthorizable, and created an archive directory that includes an old version of Ownable",
+                "pr": 2019
+            },
+            {
+                "note": "Remove `LibAssetProxyIds` contract",
+                "pr": 2055
+            },
+            {
+                "note": "Compile and export all contracts, artifacts, and wrappers by default",
+                "pr": 2055
+            },
+            {
+                "note": "Remove unused dependency on IAuthorizable in IAssetProxy",
+                "pr": 1910
+            },
+            {
+                "note": "Add `ERC20BridgeProxy`",
+                "pr": 2220
+            },
+            {
+                "note": "Add `Eth2DaiBridge`",
+                "pr": 2221
+            },
+            {
+                "note": "Add `UniswapBridge`",
+                "pr": 2233
+            },
+            {
+                "note": "Replaced `SafeMath` with `LibSafeMath`",
+                "pr": 2254
+            }
+        ],
+        "timestamp": 1575296764
+    },
+    {
+        "version": "2.3.0-beta.4",
+        "changes": [
+            {
+                "note": "Implement `KyberBridge`.",
+                "pr": 2352
+            }
+        ],
+        "timestamp": 1575290197
+    },
     {
         "version": "2.3.0-beta.3",
         "changes": [

contracts/asset-proxy/CHANGELOG.md

@@ -5,6 +5,24 @@ Edit the package's CHANGELOG.json file only.
 
 CHANGELOG
 
+## v3.0.0 - _December 2, 2019_
+
+    * Implement `KyberBridge`. (#2352)
+    * Drastically reduced bundle size by adding .npmignore, only exporting specific artifacts/wrappers/utils (#2330)
+    * ERC20Wrapper and ERC1155ProxyWrapper constructors now require an instance of DevUtilsContract (#2034)
+    * Disallow the zero address from being made an authorized address in MixinAuthorizable, and created an archive directory that includes an old version of Ownable (#2019)
+    * Remove `LibAssetProxyIds` contract (#2055)
+    * Compile and export all contracts, artifacts, and wrappers by default (#2055)
+    * Remove unused dependency on IAuthorizable in IAssetProxy (#1910)
+    * Add `ERC20BridgeProxy` (#2220)
+    * Add `Eth2DaiBridge` (#2221)
+    * Add `UniswapBridge` (#2233)
+    * Replaced `SafeMath` with `LibSafeMath` (#2254)
+
+## v2.3.0-beta.4 - _December 2, 2019_
+
+    * Implement `KyberBridge`. (#2352)
+
 ## v2.3.0-beta.3 - _November 20, 2019_
 
     * Dependencies updated

contracts/asset-proxy/contracts/src/bridges/Eth2DaiBridge.sol

@@ -22,6 +22,7 @@ pragma experimental ABIEncoderV2;
 import "@0x/contracts-erc20/contracts/src/interfaces/IERC20Token.sol";
 import "@0x/contracts-erc20/contracts/src/LibERC20Token.sol";
 import "@0x/contracts-exchange-libs/contracts/src/IWallet.sol";
+import "@0x/contracts-utils/contracts/src/DeploymentConstants.sol";
 import "../interfaces/IERC20Bridge.sol";
 import "../interfaces/IEth2Dai.sol";
 
@@ -29,11 +30,9 @@ import "../interfaces/IEth2Dai.sol";
 // solhint-disable space-after-comma
 contract Eth2DaiBridge is
     IERC20Bridge,
-    IWallet
+    IWallet,
+    DeploymentConstants
 {
-    /* Mainnet addresses */
-    address constant public ETH2DAI_ADDRESS = 0x39755357759cE0d7f32dC8dC45414CCa409AE24e;
-
     /// @dev Callback for `IERC20Bridge`. Tries to buy `amount` of
     ///      `toTokenAddress` tokens by selling the entirety of the opposing asset
     ///      (DAI or WETH) to the Eth2Dai contract, then transfers the bought
@@ -61,8 +60,8 @@ contract Eth2DaiBridge is
         LibERC20Token.approve(fromTokenAddress, address(exchange), uint256(-1));
 
         // Try to sell all of this contract's `fromTokenAddress` token balance.
-        uint256 boughtAmount = _getEth2DaiContract().sellAllAmount(
-            address(fromTokenAddress),
+        uint256 boughtAmount = exchange.sellAllAmount(
+            fromTokenAddress,
             IERC20Token(fromTokenAddress).balanceOf(address(this)),
             toTokenAddress,
             amount
@@ -93,6 +92,6 @@ contract Eth2DaiBridge is
         view
         returns (IEth2Dai exchange)
     {
-        return IEth2Dai(ETH2DAI_ADDRESS);
+        return IEth2Dai(_getEth2DaiAddress());
     }
 }

contracts/asset-proxy/contracts/src/bridges/KyberBridge.sol

@@ -0,0 +1,166 @@
+/*
+
+  Copyright 2019 ZeroEx Intl.
+
+  Licensed under the Apache License, Version 2.0 (the "License");
+  you may not use this file except in compliance with the License.
+  You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+  Unless required by applicable law or agreed to in writing, software
+  distributed under the License is distributed on an "AS IS" BASIS,
+  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  See the License for the specific language governing permissions and
+  limitations under the License.
+
+*/
+
+pragma solidity ^0.5.9;
+pragma experimental ABIEncoderV2;
+
+import "@0x/contracts-erc20/contracts/src/interfaces/IERC20Token.sol";
+import "@0x/contracts-erc20/contracts/src/interfaces/IEtherToken.sol";
+import "@0x/contracts-erc20/contracts/src/LibERC20Token.sol";
+import "@0x/contracts-exchange-libs/contracts/src/IWallet.sol";
+import "@0x/contracts-utils/contracts/src/DeploymentConstants.sol";
+import "../interfaces/IERC20Bridge.sol";
+import "../interfaces/IKyberNetworkProxy.sol";
+
+
+// solhint-disable space-after-comma
+contract KyberBridge is
+    IERC20Bridge,
+    IWallet,
+    DeploymentConstants
+{
+    // @dev Structure used internally to get around stack limits.
+    struct TradeState {
+        IKyberNetworkProxy kyber;
+        IEtherToken weth;
+        address fromTokenAddress;
+        uint256 fromTokenBalance;
+        uint256 payableAmount;
+    }
+
+    /// @dev Kyber ETH pseudo-address.
+    address constant public KYBER_ETH_ADDRESS = 0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE;
+    /// @dev `bridgeTransferFrom()` failure result.
+    bytes4 constant private BRIDGE_FAILED = 0x0;
+    /// @dev Precision of Kyber rates.
+    uint256 constant private KYBER_RATE_BASE = 10 ** 18;
+
+    // solhint-disable no-empty-blocks
+    /// @dev Payable fallback to receive ETH from Kyber.
+    function ()
+        external
+        payable
+    {}
+
+    /// @dev Callback for `IKyberBridge`. Tries to buy `amount` of
+    ///      `toTokenAddress` tokens by selling the entirety of the opposing asset
+    ///      to the `KyberNetworkProxy` contract, then transfers the bought
+    ///      tokens to `to`.
+    /// @param toTokenAddress The token to give to `to`.
+    /// @param to The recipient of the bought tokens.
+    /// @param amount Minimum amount of `toTokenAddress` tokens to buy.
+    /// @param bridgeData The abi-encoeded "from" token address.
+    /// @return success The magic bytes if successful.
+    function bridgeTransferFrom(
+        address toTokenAddress,
+        address /* from */,
+        address to,
+        uint256 amount,
+        bytes calldata bridgeData
+    )
+        external
+        returns (bytes4 success)
+    {
+        TradeState memory state;
+        state.kyber = _getKyberContract();
+        state.weth = _getWETHContract();
+        // Decode the bridge data to get the `fromTokenAddress`.
+        (state.fromTokenAddress) = abi.decode(bridgeData, (address));
+        state.fromTokenBalance = IERC20Token(state.fromTokenAddress).balanceOf(address(this));
+        if (state.fromTokenBalance == 0) {
+            // Return failure if no input tokens.
+            return BRIDGE_FAILED;
+        }
+        if (state.fromTokenAddress == toTokenAddress) {
+            // Just transfer the tokens if they're the same.
+            LibERC20Token.transfer(state.fromTokenAddress, to, state.fromTokenBalance);
+            return BRIDGE_SUCCESS;
+        } else if (state.fromTokenAddress != address(state.weth)) {
+            // If the input token is not WETH, grant an allowance to the exchange
+            // to spend them.
+            LibERC20Token.approve(state.fromTokenAddress, address(state.kyber), uint256(-1));
+        } else {
+            // If the input token is WETH, unwrap it and attach it to the call.
+            state.fromTokenAddress = KYBER_ETH_ADDRESS;
+            state.payableAmount = state.fromTokenBalance;
+            state.weth.withdraw(state.fromTokenBalance);
+        }
+        bool isToTokenWeth = toTokenAddress == address(state.weth);
+
+        // Try to sell all of this contract's input token balance through
+        // `KyberNetworkProxy.trade()`.
+        uint256 boughtAmount = state.kyber.trade.value(state.payableAmount)(
+            // Input token.
+            state.fromTokenAddress,
+            // Sell amount.
+            state.fromTokenBalance,
+            // Output token.
+            isToTokenWeth ? KYBER_ETH_ADDRESS : toTokenAddress,
+            // Transfer to this contract if converting to ETH, otherwise
+            // transfer directly to the recipient.
+            isToTokenWeth ? address(uint160(address(this))) : address(uint160(to)),
+            // Buy as much as possible.
+            uint256(-1),
+            // Compute the minimum conversion rate, which is expressed in units with
+            // 18 decimal places.
+            (KYBER_RATE_BASE * amount) / state.fromTokenBalance,
+            // No affiliate address.
+            address(0)
+        );
+        // Wrap ETH output and transfer to recipient.
+        if (isToTokenWeth) {
+            state.weth.deposit.value(boughtAmount)();
+            state.weth.transfer(to, boughtAmount);
+        }
+        return BRIDGE_SUCCESS;
+    }
+
+    /// @dev `SignatureType.Wallet` callback, so that this bridge can be the maker
+    ///      and sign for itself in orders. Always succeeds.
+    /// @return magicValue Magic success bytes, always.
+    function isValidSignature(
+        bytes32,
+        bytes calldata
+    )
+        external
+        view
+        returns (bytes4 magicValue)
+    {
+        return LEGACY_WALLET_MAGIC_VALUE;
+    }
+
+    /// @dev Overridable way to get the `KyberNetworkProxy` contract.
+    /// @return kyber The `IKyberNetworkProxy` contract.
+    function _getKyberContract()
+        internal
+        view
+        returns (IKyberNetworkProxy kyber)
+    {
+        return IKyberNetworkProxy(_getKyberNetworkProxyAddress());
+    }
+
+    /// @dev Overridable way to get the WETH contract.
+    /// @return weth The WETH contract.
+    function _getWETHContract()
+        internal
+        view
+        returns (IEtherToken weth)
+    {
+        return IEtherToken(_getWETHAddress());
+    }
+}

contracts/asset-proxy/contracts/src/bridges/UniswapBridge.sol

@@ -23,6 +23,7 @@ import "@0x/contracts-erc20/contracts/src/interfaces/IERC20Token.sol";
 import "@0x/contracts-erc20/contracts/src/interfaces/IEtherToken.sol";
 import "@0x/contracts-erc20/contracts/src/LibERC20Token.sol";
 import "@0x/contracts-exchange-libs/contracts/src/IWallet.sol";
+import "@0x/contracts-utils/contracts/src/DeploymentConstants.sol";
 import "../interfaces/IUniswapExchangeFactory.sol";
 import "../interfaces/IUniswapExchange.sol";
 import "../interfaces/IERC20Bridge.sol";
@@ -32,12 +33,9 @@ import "../interfaces/IERC20Bridge.sol";
 // solhint-disable not-rely-on-time
 contract UniswapBridge is
     IERC20Bridge,
-    IWallet
+    IWallet,
+    DeploymentConstants
 {
-    /* Mainnet addresses */
-    address constant private UNISWAP_EXCHANGE_FACTORY_ADDRESS = 0xc0a47dFe034B400B47bDaD5FecDa2621de6c4d95;
-    address constant private WETH_ADDRESS = 0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2;
-
     // Struct to hold `bridgeTransferFrom()` local variables in memory and to avoid
     // stack overflows.
     struct WithdrawToState {
@@ -170,7 +168,7 @@ contract UniswapBridge is
         view
         returns (IEtherToken token)
     {
-        return IEtherToken(WETH_ADDRESS);
+        return IEtherToken(_getWETHAddress());
     }
 
     /// @dev Overridable way to get the uniswap exchange factory contract.
@@ -180,7 +178,7 @@ contract UniswapBridge is
         view
         returns (IUniswapExchangeFactory factory)
     {
-        return IUniswapExchangeFactory(UNISWAP_EXCHANGE_FACTORY_ADDRESS);
+        return IUniswapExchangeFactory(_getUniswapExchangeFactoryAddress());
     }
 
     /// @dev Grants an unlimited allowance to the exchange for its token
@@ -212,7 +210,9 @@ contract UniswapBridge is
         if (fromTokenAddress == address(getWethContract())) {
             exchangeTokenAddress = toTokenAddress;
         }
-        exchange = getUniswapExchangeFactoryContract().getExchange(exchangeTokenAddress);
+        exchange = IUniswapExchange(
+            getUniswapExchangeFactoryContract().getExchange(exchangeTokenAddress)
+        );
         require(address(exchange) != address(0), "NO_UNISWAP_EXCHANGE_FOR_TOKEN");
         return exchange;
     }

contracts/asset-proxy/contracts/src/interfaces/IKyberNetworkProxy.sol

@@ -0,0 +1,46 @@
+/*
+
+  Copyright 2019 ZeroEx Intl.
+
+  Licensed under the Apache License, Version 2.0 (the "License");
+  you may not use this file except in compliance with the License.
+  You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+  Unless required by applicable law or agreed to in writing, software
+  distributed under the License is distributed on an "AS IS" BASIS,
+  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  See the License for the specific language governing permissions and
+  limitations under the License.
+
+*/
+
+pragma solidity ^0.5.9;
+
+
+interface IKyberNetworkProxy {
+
+    /// @dev Sells `sellTokenAddress` tokens for `buyTokenAddress` tokens.
+    /// @param sellTokenAddress Token to sell.
+    /// @param sellAmount Amount of tokens to sell.
+    /// @param buyTokenAddress Token to buy.
+    /// @param recipientAddress Address to send bought tokens to.
+    /// @param maxBuyTokenAmount A limit on the amount of tokens to buy.
+    /// @param minConversionRate The minimal conversion rate. If actual rate
+    ///        is lower, trade is canceled.
+    /// @param walletId The wallet ID to send part of the fees
+    /// @return boughtAmount Amount of tokens bought.
+    function trade(
+        address sellTokenAddress,
+        uint256 sellAmount,
+        address buyTokenAddress,
+        address payable recipientAddress,
+        uint256 maxBuyTokenAmount,
+        uint256 minConversionRate,
+        address walletId
+    )
+        external
+        payable
+        returns(uint256 boughtAmount);
+}

contracts/asset-proxy/contracts/src/interfaces/IUniswapExchange.sol

@@ -67,11 +67,4 @@ interface IUniswapExchange {
     )
         external
         returns (uint256 tokensBought);
-
-    /// @dev Retrieves the token that is associated with this exchange.
-    /// @return tokenAddress The token address.
-    function toTokenAddress()
-        external
-        view
-        returns (address tokenAddress);
 }

contracts/asset-proxy/contracts/src/interfaces/IUniswapExchangeFactory.sol

@@ -28,5 +28,5 @@ interface IUniswapExchangeFactory {
     function getExchange(address tokenAddress)
         external
         view
-        returns (IUniswapExchange);
+        returns (address);
 }

contracts/asset-proxy/contracts/test/TestKyberBridge.sol

@@ -0,0 +1,322 @@
+/*
+
+  Copyright 2019 ZeroEx Intl.
+
+  Licensed under the Apache License, Version 2.0 (the "License");
+  you may not use this file except in compliance with the License.
+  You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+  Unless required by applicable law or agreed to in writing, software
+  distributed under the License is distributed on an "AS IS" BASIS,
+  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  See the License for the specific language governing permissions and
+  limitations under the License.
+
+*/
+
+pragma solidity ^0.5.9;
+pragma experimental ABIEncoderV2;
+
+import "@0x/contracts-erc20/contracts/src/interfaces/IERC20Token.sol";
+import "../src/bridges/KyberBridge.sol";
+import "../src/interfaces/IKyberNetworkProxy.sol";
+
+
+// solhint-disable no-simple-event-func-name
+interface ITestContract {
+
+    function wethWithdraw(
+        address payable ownerAddress,
+        uint256 amount
+    )
+        external;
+
+    function wethDeposit(
+        address ownerAddress
+    )
+        external
+        payable;
+
+    function tokenTransfer(
+        address ownerAddress,
+        address recipientAddress,
+        uint256 amount
+    )
+        external
+        returns (bool success);
+
+    function tokenApprove(
+        address ownerAddress,
+        address spenderAddress,
+        uint256 allowance
+    )
+        external
+        returns (bool success);
+
+    function tokenBalanceOf(
+        address ownerAddress
+    )
+        external
+        view
+        returns (uint256 balance);
+}
+
+
+/// @dev A minimalist ERC20/WETH token.
+contract TestToken {
+
+    ITestContract private _testContract;
+
+    constructor() public {
+        _testContract = ITestContract(msg.sender);
+    }
+
+    function approve(address spender, uint256 allowance)
+        external
+        returns (bool)
+    {
+        return _testContract.tokenApprove(
+            msg.sender,
+            spender,
+            allowance
+        );
+    }
+
+    function transfer(address recipient, uint256 amount)
+        external
+        returns (bool)
+    {
+        return _testContract.tokenTransfer(
+            msg.sender,
+            recipient,
+            amount
+        );
+    }
+
+    function withdraw(uint256 amount)
+        external
+    {
+        return _testContract.wethWithdraw(msg.sender, amount);
+    }
+
+    function deposit()
+        external
+        payable
+    {
+        return _testContract.wethDeposit.value(msg.value)(msg.sender);
+    }
+
+    function balanceOf(address owner)
+        external
+        view
+        returns (uint256)
+    {
+        return _testContract.tokenBalanceOf(owner);
+    }
+}
+
+
+/// @dev KyberBridge overridden to mock tokens and implement IKyberBridge.
+contract TestKyberBridge is
+    KyberBridge,
+    ITestContract,
+    IKyberNetworkProxy
+{
+    event KyberBridgeTrade(
+        uint256 msgValue,
+        address sellTokenAddress,
+        uint256 sellAmount,
+        address buyTokenAddress,
+        address payable recipientAddress,
+        uint256 maxBuyTokenAmount,
+        uint256 minConversionRate,
+        address walletId
+    );
+
+    event KyberBridgeWethWithdraw(
+        address ownerAddress,
+        uint256 amount
+    );
+
+    event KyberBridgeWethDeposit(
+        uint256 msgValue,
+        address ownerAddress,
+        uint256 amount
+    );
+
+    event KyberBridgeTokenApprove(
+        address tokenAddress,
+        address ownerAddress,
+        address spenderAddress,
+        uint256 allowance
+    );
+
+    event KyberBridgeTokenTransfer(
+        address tokenAddress,
+        address ownerAddress,
+        address recipientAddress,
+        uint256 amount
+    );
+
+    IEtherToken public weth;
+    mapping (address => mapping (address => uint256)) private _tokenBalances;
+    uint256 private _nextFillAmount;
+
+    constructor() public {
+        weth = IEtherToken(address(new TestToken()));
+    }
+
+    /// @dev Implementation of `IKyberNetworkProxy.trade()`
+    function trade(
+        address sellTokenAddress,
+        uint256 sellAmount,
+        address buyTokenAddress,
+        address payable recipientAddress,
+        uint256 maxBuyTokenAmount,
+        uint256 minConversionRate,
+        address walletId
+    )
+        external
+        payable
+        returns(uint256 boughtAmount)
+    {
+        emit KyberBridgeTrade(
+            msg.value,
+            sellTokenAddress,
+            sellAmount,
+            buyTokenAddress,
+            recipientAddress,
+            maxBuyTokenAmount,
+            minConversionRate,
+            walletId
+        );
+        return _nextFillAmount;
+    }
+
+    function createToken()
+        external
+        returns (address tokenAddress)
+    {
+        return address(new TestToken());
+    }
+
+    function setNextFillAmount(uint256 amount)
+        external
+        payable
+    {
+        if (msg.value != 0) {
+            require(amount == msg.value, "VALUE_AMOUNT_MISMATCH");
+            grantTokensTo(address(weth), address(this), msg.value);
+        }
+        _nextFillAmount = amount;
+    }
+
+    function wethDeposit(
+        address ownerAddress
+    )
+        external
+        payable
+    {
+        require(msg.sender == address(weth), "ONLY_WETH");
+        grantTokensTo(address(weth), ownerAddress, msg.value);
+        emit KyberBridgeWethDeposit(
+            msg.value,
+            ownerAddress,
+            msg.value
+        );
+    }
+
+    function wethWithdraw(
+        address payable ownerAddress,
+        uint256 amount
+    )
+        external
+    {
+        require(msg.sender == address(weth), "ONLY_WETH");
+        _tokenBalances[address(weth)][ownerAddress] -= amount;
+        ownerAddress.transfer(amount);
+        emit KyberBridgeWethWithdraw(
+            ownerAddress,
+            amount
+        );
+    }
+
+    function tokenApprove(
+        address ownerAddress,
+        address spenderAddress,
+        uint256 allowance
+    )
+        external
+        returns (bool success)
+    {
+        emit KyberBridgeTokenApprove(
+            msg.sender,
+            ownerAddress,
+            spenderAddress,
+            allowance
+        );
+        return true;
+    }
+
+    function tokenTransfer(
+        address ownerAddress,
+        address recipientAddress,
+        uint256 amount
+    )
+        external
+        returns (bool success)
+    {
+        _tokenBalances[msg.sender][ownerAddress] -= amount;
+        _tokenBalances[msg.sender][recipientAddress] += amount;
+        emit KyberBridgeTokenTransfer(
+            msg.sender,
+            ownerAddress,
+            recipientAddress,
+            amount
+        );
+        return true;
+    }
+
+    function tokenBalanceOf(
+        address ownerAddress
+    )
+        external
+        view
+        returns (uint256 balance)
+    {
+        return _tokenBalances[msg.sender][ownerAddress];
+    }
+
+    function grantTokensTo(address tokenAddress, address ownerAddress, uint256 amount)
+        public
+        payable
+    {
+        _tokenBalances[tokenAddress][ownerAddress] += amount;
+        if (tokenAddress != address(weth)) {
+            // Send back ether if not WETH.
+            msg.sender.transfer(msg.value);
+        } else {
+            require(msg.value == amount, "VALUE_AMOUNT_MISMATCH");
+        }
+    }
+
+    // @dev overridden to point to this contract.
+    function _getKyberContract()
+        internal
+        view
+        returns (IKyberNetworkProxy kyber)
+    {
+        return IKyberNetworkProxy(address(this));
+    }
+
+    // @dev overridden to point to test WETH.
+    function _getWETHContract()
+        internal
+        view
+        returns (IEtherToken weth_)
+    {
+        return weth;
+    }
+}

contracts/asset-proxy/contracts/test/TestUniswapBridge.sol

@@ -407,9 +407,9 @@ contract TestUniswapBridge is
     function getExchange(address tokenAddress)
         external
         view
-        returns (IUniswapExchange)
+        returns (address)
     {
-        return IUniswapExchange(_testExchanges[tokenAddress]);
+        return address(_testExchanges[tokenAddress]);
     }
 
     // @dev Use `wethToken`.

contracts/asset-proxy/package.json

@@ -1,6 +1,6 @@
 {
     "name": "@0x/contracts-asset-proxy",
-    "version": "2.3.0-beta.3",
+    "version": "3.0.0",
     "engines": {
         "node": ">=6.12"
     },
@@ -38,8 +38,8 @@
         "docs:json": "typedoc --excludePrivate --excludeExternals --excludeProtected --ignoreCompilerErrors --target ES5 --tsconfig typedoc-tsconfig.json --json $JSON_FILE_PATH $PROJECT_FILES"
     },
     "config": {
-        "publicInterfaceContracts": "ERC1155Proxy,ERC20Proxy,ERC721Proxy,MultiAssetProxy,StaticCallProxy,ERC20BridgeProxy,Eth2DaiBridge,IAssetData,IAssetProxy,UniswapBridge,TestStaticCallTarget",
-        "abis": "./test/generated-artifacts/@(ERC1155Proxy|ERC20BridgeProxy|ERC20Proxy|ERC721Proxy|Eth2DaiBridge|IAssetData|IAssetProxy|IAssetProxyDispatcher|IAuthorizable|IERC20Bridge|IEth2Dai|IUniswapExchange|IUniswapExchangeFactory|MixinAssetProxyDispatcher|MixinAuthorizable|MultiAssetProxy|Ownable|StaticCallProxy|TestERC20Bridge|TestEth2DaiBridge|TestStaticCallTarget|TestUniswapBridge|UniswapBridge).json",
+        "publicInterfaceContracts": "ERC1155Proxy,ERC20Proxy,ERC721Proxy,MultiAssetProxy,StaticCallProxy,ERC20BridgeProxy,Eth2DaiBridge,IAssetData,IAssetProxy,UniswapBridge,KyberBridge,TestStaticCallTarget",
+        "abis": "./test/generated-artifacts/@(ERC1155Proxy|ERC20BridgeProxy|ERC20Proxy|ERC721Proxy|Eth2DaiBridge|IAssetData|IAssetProxy|IAssetProxyDispatcher|IAuthorizable|IERC20Bridge|IEth2Dai|IKyberNetworkProxy|IUniswapExchange|IUniswapExchangeFactory|KyberBridge|MixinAssetProxyDispatcher|MixinAuthorizable|MultiAssetProxy|Ownable|StaticCallProxy|TestERC20Bridge|TestEth2DaiBridge|TestKyberBridge|TestStaticCallTarget|TestUniswapBridge|UniswapBridge).json",
         "abis:comment": "This list is auto-generated by contracts-gen. Don't edit manually."
     },
     "repository": {
@@ -52,15 +52,15 @@
     },
     "homepage": "https://github.com/0xProject/0x-monorepo/contracts/protocol/README.md",
     "devDependencies": {
-        "@0x/abi-gen": "^4.4.0-beta.3",
-        "@0x/contracts-gen": "^1.1.0-beta.3",
-        "@0x/contracts-test-utils": "^3.2.0-beta.3",
-        "@0x/contracts-utils": "^3.3.0-beta.3",
-        "@0x/dev-utils": "^2.4.0-beta.3",
-        "@0x/sol-compiler": "^3.2.0-beta.3",
+        "@0x/abi-gen": "^5.0.0",
+        "@0x/contracts-gen": "^2.0.0",
+        "@0x/contracts-test-utils": "^4.0.0",
+        "@0x/contracts-utils": "^4.0.0",
+        "@0x/dev-utils": "^3.0.0",
+        "@0x/sol-compiler": "^4.0.0",
         "@0x/ts-doc-gen": "^0.0.22",
-        "@0x/tslint-config": "^3.1.0-beta.2",
-        "@0x/types": "^2.5.0-beta.2",
+        "@0x/tslint-config": "^4.0.0",
+        "@0x/types": "^3.0.0",
         "@types/lodash": "4.14.104",
         "@types/mocha": "^5.2.7",
         "@types/node": "*",
@@ -80,16 +80,16 @@
         "typescript": "3.0.1"
     },
     "dependencies": {
-        "@0x/base-contract": "^5.5.0-beta.3",
-        "@0x/contracts-dev-utils": "^0.1.0-beta.3",
-        "@0x/contracts-erc1155": "^1.2.0-beta.3",
-        "@0x/contracts-erc20": "^2.3.0-beta.3",
-        "@0x/contracts-erc721": "^2.2.0-beta.3",
-        "@0x/order-utils": "^8.5.0-beta.3",
-        "@0x/typescript-typings": "^4.4.0-beta.2",
-        "@0x/utils": "^4.6.0-beta.2",
-        "@0x/web3-wrapper": "^6.1.0-beta.2",
-        "ethereum-types": "^2.2.0-beta.2",
+        "@0x/base-contract": "^6.0.0",
+        "@0x/contracts-dev-utils": "^1.0.0",
+        "@0x/contracts-erc1155": "^2.0.0",
+        "@0x/contracts-erc20": "^3.0.0",
+        "@0x/contracts-erc721": "^3.0.0",
+        "@0x/order-utils": "^9.0.0",
+        "@0x/typescript-typings": "^5.0.0",
+        "@0x/utils": "^5.0.0",
+        "@0x/web3-wrapper": "^7.0.0",
+        "ethereum-types": "^3.0.0",
         "lodash": "^4.17.11"
     },
     "publishConfig": {

contracts/asset-proxy/src/artifacts.ts

@@ -12,6 +12,7 @@ import * as ERC721Proxy from '../generated-artifacts/ERC721Proxy.json';
 import * as Eth2DaiBridge from '../generated-artifacts/Eth2DaiBridge.json';
 import * as IAssetData from '../generated-artifacts/IAssetData.json';
 import * as IAssetProxy from '../generated-artifacts/IAssetProxy.json';
+import * as KyberBridge from '../generated-artifacts/KyberBridge.json';
 import * as MultiAssetProxy from '../generated-artifacts/MultiAssetProxy.json';
 import * as StaticCallProxy from '../generated-artifacts/StaticCallProxy.json';
 import * as TestStaticCallTarget from '../generated-artifacts/TestStaticCallTarget.json';
@@ -27,5 +28,6 @@ export const artifacts = {
     IAssetData: IAssetData as ContractArtifact,
     IAssetProxy: IAssetProxy as ContractArtifact,
     UniswapBridge: UniswapBridge as ContractArtifact,
+    KyberBridge: KyberBridge as ContractArtifact,
     TestStaticCallTarget: TestStaticCallTarget as ContractArtifact,
 };

contracts/asset-proxy/src/index.ts

@@ -16,7 +16,7 @@ export {
 export { ERC20Wrapper } from './erc20_wrapper';
 export { ERC721Wrapper } from './erc721_wrapper';
 export { ERC1155ProxyWrapper } from './erc1155_proxy_wrapper';
-export { Erc1155Wrapper, ERC1155MintableContract } from '@0x/contracts-erc1155';
+export { ERC1155MintableContract, Erc1155Wrapper } from '@0x/contracts-erc1155';
 export { DummyERC20TokenContract } from '@0x/contracts-erc20';
 export { DummyERC721TokenContract } from '@0x/contracts-erc721';
 export {

contracts/asset-proxy/src/wrappers.ts

@@ -10,6 +10,7 @@ export * from '../generated-wrappers/erc721_proxy';
 export * from '../generated-wrappers/eth2_dai_bridge';
 export * from '../generated-wrappers/i_asset_data';
 export * from '../generated-wrappers/i_asset_proxy';
+export * from '../generated-wrappers/kyber_bridge';
 export * from '../generated-wrappers/multi_asset_proxy';
 export * from '../generated-wrappers/static_call_proxy';
 export * from '../generated-wrappers/test_static_call_target';

contracts/asset-proxy/test/artifacts.ts

@@ -16,8 +16,10 @@ import * as IAssetProxyDispatcher from '../test/generated-artifacts/IAssetProxyD
 import * as IAuthorizable from '../test/generated-artifacts/IAuthorizable.json';
 import * as IERC20Bridge from '../test/generated-artifacts/IERC20Bridge.json';
 import * as IEth2Dai from '../test/generated-artifacts/IEth2Dai.json';
+import * as IKyberNetworkProxy from '../test/generated-artifacts/IKyberNetworkProxy.json';
 import * as IUniswapExchange from '../test/generated-artifacts/IUniswapExchange.json';
 import * as IUniswapExchangeFactory from '../test/generated-artifacts/IUniswapExchangeFactory.json';
+import * as KyberBridge from '../test/generated-artifacts/KyberBridge.json';
 import * as MixinAssetProxyDispatcher from '../test/generated-artifacts/MixinAssetProxyDispatcher.json';
 import * as MixinAuthorizable from '../test/generated-artifacts/MixinAuthorizable.json';
 import * as MultiAssetProxy from '../test/generated-artifacts/MultiAssetProxy.json';
@@ -25,6 +27,7 @@ import * as Ownable from '../test/generated-artifacts/Ownable.json';
 import * as StaticCallProxy from '../test/generated-artifacts/StaticCallProxy.json';
 import * as TestERC20Bridge from '../test/generated-artifacts/TestERC20Bridge.json';
 import * as TestEth2DaiBridge from '../test/generated-artifacts/TestEth2DaiBridge.json';
+import * as TestKyberBridge from '../test/generated-artifacts/TestKyberBridge.json';
 import * as TestStaticCallTarget from '../test/generated-artifacts/TestStaticCallTarget.json';
 import * as TestUniswapBridge from '../test/generated-artifacts/TestUniswapBridge.json';
 import * as UniswapBridge from '../test/generated-artifacts/UniswapBridge.json';
@@ -39,6 +42,7 @@ export const artifacts = {
     MultiAssetProxy: MultiAssetProxy as ContractArtifact,
     StaticCallProxy: StaticCallProxy as ContractArtifact,
     Eth2DaiBridge: Eth2DaiBridge as ContractArtifact,
+    KyberBridge: KyberBridge as ContractArtifact,
     UniswapBridge: UniswapBridge as ContractArtifact,
     IAssetData: IAssetData as ContractArtifact,
     IAssetProxy: IAssetProxy as ContractArtifact,
@@ -46,10 +50,12 @@ export const artifacts = {
     IAuthorizable: IAuthorizable as ContractArtifact,
     IERC20Bridge: IERC20Bridge as ContractArtifact,
     IEth2Dai: IEth2Dai as ContractArtifact,
+    IKyberNetworkProxy: IKyberNetworkProxy as ContractArtifact,
     IUniswapExchange: IUniswapExchange as ContractArtifact,
     IUniswapExchangeFactory: IUniswapExchangeFactory as ContractArtifact,
     TestERC20Bridge: TestERC20Bridge as ContractArtifact,
     TestEth2DaiBridge: TestEth2DaiBridge as ContractArtifact,
+    TestKyberBridge: TestKyberBridge as ContractArtifact,
     TestStaticCallTarget: TestStaticCallTarget as ContractArtifact,
     TestUniswapBridge: TestUniswapBridge as ContractArtifact,
 };

contracts/asset-proxy/test/kyber_bridge.ts

@@ -0,0 +1,272 @@
+import {
+    blockchainTests,
+    constants,
+    expect,
+    getRandomInteger,
+    hexLeftPad,
+    hexRandom,
+    randomAddress,
+    verifyEventsFromLogs,
+} from '@0x/contracts-test-utils';
+import { AssetProxyId } from '@0x/types';
+import { BigNumber } from '@0x/utils';
+import { DecodedLogs } from 'ethereum-types';
+import * as _ from 'lodash';
+
+import { artifacts } from './artifacts';
+
+import { TestKyberBridgeContract, TestKyberBridgeEvents } from './wrappers';
+
+blockchainTests.resets('KyberBridge unit tests', env => {
+    const KYBER_ETH_ADDRESS = '0xeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee';
+    let testContract: TestKyberBridgeContract;
+
+    before(async () => {
+        testContract = await TestKyberBridgeContract.deployFrom0xArtifactAsync(
+            artifacts.TestKyberBridge,
+            env.provider,
+            env.txDefaults,
+            artifacts,
+        );
+    });
+
+    describe('isValidSignature()', () => {
+        it('returns success bytes', async () => {
+            const LEGACY_WALLET_MAGIC_VALUE = '0xb0671381';
+            const result = await testContract.isValidSignature(hexRandom(), hexRandom(_.random(0, 32))).callAsync();
+            expect(result).to.eq(LEGACY_WALLET_MAGIC_VALUE);
+        });
+    });
+
+    describe('bridgeTransferFrom()', () => {
+        let fromTokenAddress: string;
+        let toTokenAddress: string;
+        let wethAddress: string;
+
+        before(async () => {
+            wethAddress = await testContract.weth().callAsync();
+            fromTokenAddress = await testContract.createToken().callAsync();
+            await testContract.createToken().awaitTransactionSuccessAsync();
+            toTokenAddress = await testContract.createToken().callAsync();
+            await testContract.createToken().awaitTransactionSuccessAsync();
+        });
+
+        const STATIC_KYBER_TRADE_ARGS = {
+            maxBuyTokenAmount: constants.MAX_UINT256,
+            walletId: constants.NULL_ADDRESS,
+        };
+
+        interface TransferFromOpts {
+            toTokenAddress: string;
+            fromTokenAddress: string;
+            toAddress: string;
+            // Amount to pass into `bridgeTransferFrom()`
+            amount: BigNumber;
+            // Amount to convert in `trade()`.
+            fillAmount: BigNumber;
+            // Token balance of the bridge.
+            fromTokenBalance: BigNumber;
+        }
+
+        interface TransferFromResult {
+            opts: TransferFromOpts;
+            result: string;
+            logs: DecodedLogs;
+        }
+
+        function createTransferFromOpts(opts?: Partial<TransferFromOpts>): TransferFromOpts {
+            return {
+                fromTokenAddress,
+                toTokenAddress,
+                toAddress: randomAddress(),
+                amount: getRandomInteger(1, 10e18),
+                fillAmount: getRandomInteger(1, 10e18),
+                fromTokenBalance: getRandomInteger(1, 10e18),
+                ...opts,
+            };
+        }
+
+        async function withdrawToAsync(opts?: Partial<TransferFromOpts>): Promise<TransferFromResult> {
+            const _opts = createTransferFromOpts(opts);
+            // Fund the contract with input tokens.
+            await testContract
+                .grantTokensTo(_opts.fromTokenAddress, testContract.address, _opts.fromTokenBalance)
+                .awaitTransactionSuccessAsync({ value: _opts.fromTokenBalance });
+            // Fund the contract with output tokens.
+            await testContract.setNextFillAmount(_opts.fillAmount).awaitTransactionSuccessAsync({
+                value: _opts.toTokenAddress === wethAddress ? _opts.fillAmount : constants.ZERO_AMOUNT,
+            });
+            // Call bridgeTransferFrom().
+            const bridgeTransferFromFn = testContract.bridgeTransferFrom(
+                // Output token
+                _opts.toTokenAddress,
+                // Random maker address.
+                randomAddress(),
+                // Recipient address.
+                _opts.toAddress,
+                // Transfer amount.
+                _opts.amount,
+                // ABI-encode the input token address as the bridge data.
+                hexLeftPad(_opts.fromTokenAddress),
+            );
+            const result = await bridgeTransferFromFn.callAsync();
+            const { logs } = await bridgeTransferFromFn.awaitTransactionSuccessAsync();
+            return {
+                opts: _opts,
+                result,
+                logs: (logs as any) as DecodedLogs,
+            };
+        }
+
+        function getMinimumConversionRate(opts: TransferFromOpts): BigNumber {
+            return opts.amount
+                .times(constants.ONE_ETHER)
+                .div(opts.fromTokenBalance)
+                .integerValue(BigNumber.ROUND_DOWN);
+        }
+
+        it('returns magic bytes on success', async () => {
+            const BRIDGE_SUCCESS_RETURN_DATA = AssetProxyId.ERC20Bridge;
+            const { result } = await withdrawToAsync();
+            expect(result).to.eq(BRIDGE_SUCCESS_RETURN_DATA);
+        });
+
+        it('can trade token -> token', async () => {
+            const { opts, logs } = await withdrawToAsync();
+            verifyEventsFromLogs(
+                logs,
+                [
+                    {
+                        sellTokenAddress: opts.fromTokenAddress,
+                        buyTokenAddress: opts.toTokenAddress,
+                        sellAmount: opts.fromTokenBalance,
+                        recipientAddress: opts.toAddress,
+                        minConversionRate: getMinimumConversionRate(opts),
+                        msgValue: constants.ZERO_AMOUNT,
+                        ...STATIC_KYBER_TRADE_ARGS,
+                    },
+                ],
+                TestKyberBridgeEvents.KyberBridgeTrade,
+            );
+        });
+
+        it('can trade token -> ETH', async () => {
+            const { opts, logs } = await withdrawToAsync({
+                toTokenAddress: wethAddress,
+            });
+            verifyEventsFromLogs(
+                logs,
+                [
+                    {
+                        sellTokenAddress: opts.fromTokenAddress,
+                        buyTokenAddress: KYBER_ETH_ADDRESS,
+                        sellAmount: opts.fromTokenBalance,
+                        recipientAddress: testContract.address,
+                        minConversionRate: getMinimumConversionRate(opts),
+                        msgValue: constants.ZERO_AMOUNT,
+                        ...STATIC_KYBER_TRADE_ARGS,
+                    },
+                ],
+                TestKyberBridgeEvents.KyberBridgeTrade,
+            );
+        });
+
+        it('can trade ETH -> token', async () => {
+            const { opts, logs } = await withdrawToAsync({
+                fromTokenAddress: wethAddress,
+            });
+            verifyEventsFromLogs(
+                logs,
+                [
+                    {
+                        sellTokenAddress: KYBER_ETH_ADDRESS,
+                        buyTokenAddress: opts.toTokenAddress,
+                        sellAmount: opts.fromTokenBalance,
+                        recipientAddress: opts.toAddress,
+                        minConversionRate: getMinimumConversionRate(opts),
+                        msgValue: opts.fromTokenBalance,
+                        ...STATIC_KYBER_TRADE_ARGS,
+                    },
+                ],
+                TestKyberBridgeEvents.KyberBridgeTrade,
+            );
+        });
+
+        it('does nothing if bridge has no token balance', async () => {
+            const { logs } = await withdrawToAsync({
+                fromTokenBalance: constants.ZERO_AMOUNT,
+            });
+            expect(logs).to.be.length(0);
+        });
+
+        it('only transfers the token if trading the same token', async () => {
+            const { opts, logs } = await withdrawToAsync({
+                toTokenAddress: fromTokenAddress,
+            });
+            verifyEventsFromLogs(
+                logs,
+                [
+                    {
+                        tokenAddress: fromTokenAddress,
+                        ownerAddress: testContract.address,
+                        recipientAddress: opts.toAddress,
+                        amount: opts.fromTokenBalance,
+                    },
+                ],
+                TestKyberBridgeEvents.KyberBridgeTokenTransfer,
+            );
+        });
+
+        it('grants Kyber an allowance when selling non-WETH', async () => {
+            const { opts, logs } = await withdrawToAsync();
+            verifyEventsFromLogs(
+                logs,
+                [
+                    {
+                        tokenAddress: opts.fromTokenAddress,
+                        ownerAddress: testContract.address,
+                        spenderAddress: testContract.address,
+                        allowance: constants.MAX_UINT256,
+                    },
+                ],
+                TestKyberBridgeEvents.KyberBridgeTokenApprove,
+            );
+        });
+
+        it('does not grant Kyber an allowance when selling WETH', async () => {
+            const { logs } = await withdrawToAsync({
+                fromTokenAddress: wethAddress,
+            });
+            verifyEventsFromLogs(logs, [], TestKyberBridgeEvents.KyberBridgeTokenApprove);
+        });
+
+        it('withdraws WETH and passes it to Kyber when selling WETH', async () => {
+            const { opts, logs } = await withdrawToAsync({
+                fromTokenAddress: wethAddress,
+            });
+            expect(logs[0].event).to.eq(TestKyberBridgeEvents.KyberBridgeWethWithdraw);
+            expect(logs[0].args).to.deep.eq({
+                ownerAddress: testContract.address,
+                amount: opts.fromTokenBalance,
+            });
+            expect(logs[1].event).to.eq(TestKyberBridgeEvents.KyberBridgeTrade);
+            expect(logs[1].args.msgValue).to.bignumber.eq(opts.fromTokenBalance);
+        });
+
+        it('wraps WETH and transfers it to the recipient when buyng WETH', async () => {
+            const { opts, logs } = await withdrawToAsync({
+                toTokenAddress: wethAddress,
+            });
+            expect(logs[0].event).to.eq(TestKyberBridgeEvents.KyberBridgeTokenApprove);
+            expect(logs[0].args.tokenAddress).to.eq(opts.fromTokenAddress);
+            expect(logs[1].event).to.eq(TestKyberBridgeEvents.KyberBridgeTrade);
+            expect(logs[1].args.recipientAddress).to.eq(testContract.address);
+            expect(logs[2].event).to.eq(TestKyberBridgeEvents.KyberBridgeWethDeposit);
+            expect(logs[2].args).to.deep.eq({
+                msgValue: opts.fillAmount,
+                ownerAddress: testContract.address,
+                amount: opts.fillAmount,
+            });
+        });
+    });
+});

contracts/asset-proxy/test/wrappers.ts

@@ -14,8 +14,10 @@ export * from '../test/generated-wrappers/i_asset_proxy_dispatcher';
 export * from '../test/generated-wrappers/i_authorizable';
 export * from '../test/generated-wrappers/i_erc20_bridge';
 export * from '../test/generated-wrappers/i_eth2_dai';
+export * from '../test/generated-wrappers/i_kyber_network_proxy';
 export * from '../test/generated-wrappers/i_uniswap_exchange';
 export * from '../test/generated-wrappers/i_uniswap_exchange_factory';
+export * from '../test/generated-wrappers/kyber_bridge';
 export * from '../test/generated-wrappers/mixin_asset_proxy_dispatcher';
 export * from '../test/generated-wrappers/mixin_authorizable';
 export * from '../test/generated-wrappers/multi_asset_proxy';
@@ -23,6 +25,7 @@ export * from '../test/generated-wrappers/ownable';
 export * from '../test/generated-wrappers/static_call_proxy';
 export * from '../test/generated-wrappers/test_erc20_bridge';
 export * from '../test/generated-wrappers/test_eth2_dai_bridge';
+export * from '../test/generated-wrappers/test_kyber_bridge';
 export * from '../test/generated-wrappers/test_static_call_target';
 export * from '../test/generated-wrappers/test_uniswap_bridge';
 export * from '../test/generated-wrappers/uniswap_bridge';

contracts/asset-proxy/tsconfig.json

@@ -10,6 +10,7 @@
         "generated-artifacts/Eth2DaiBridge.json",
         "generated-artifacts/IAssetData.json",
         "generated-artifacts/IAssetProxy.json",
+        "generated-artifacts/KyberBridge.json",
         "generated-artifacts/MultiAssetProxy.json",
         "generated-artifacts/StaticCallProxy.json",
         "generated-artifacts/TestStaticCallTarget.json",
@@ -25,8 +26,10 @@
         "test/generated-artifacts/IAuthorizable.json",
         "test/generated-artifacts/IERC20Bridge.json",
         "test/generated-artifacts/IEth2Dai.json",
+        "test/generated-artifacts/IKyberNetworkProxy.json",
         "test/generated-artifacts/IUniswapExchange.json",
         "test/generated-artifacts/IUniswapExchangeFactory.json",
+        "test/generated-artifacts/KyberBridge.json",
         "test/generated-artifacts/MixinAssetProxyDispatcher.json",
         "test/generated-artifacts/MixinAuthorizable.json",
         "test/generated-artifacts/MultiAssetProxy.json",
@@ -34,6 +37,7 @@
         "test/generated-artifacts/StaticCallProxy.json",
         "test/generated-artifacts/TestERC20Bridge.json",
         "test/generated-artifacts/TestEth2DaiBridge.json",
+        "test/generated-artifacts/TestKyberBridge.json",
         "test/generated-artifacts/TestStaticCallTarget.json",
         "test/generated-artifacts/TestUniswapBridge.json",
         "test/generated-artifacts/UniswapBridge.json"

contracts/coordinator/CHANGELOG.json

@@ -1,4 +1,71 @@
 [
+    {
+        "version": "3.0.0",
+        "changes": [
+            {
+                "note": "Drastically reduced bundle size by adding .npmignore, only exporting specific artifacts/wrappers/utils",
+                "pr": 2330
+            },
+            {
+                "note": "Introduced new export CoordinatorRevertErrors",
+                "pr": 2321
+            },
+            {
+                "note": "Added dependency on @0x/contracts-utils",
+                "pr": 2321
+            },
+            {
+                "note": "Add chainId to domain separator",
+                "pr": 1742
+            },
+            {
+                "note": "Inherit Exchange domain constants from `exchange-libs` to reduce code duplication",
+                "pr": 1742
+            },
+            {
+                "note": "Update domain separator",
+                "pr": 1742
+            },
+            {
+                "note": "Refactor contract to use new ITransactions interface",
+                "pr": 1753
+            },
+            {
+                "note": "Add verifyingContractIfExists arg to LibEIP712CoordinatorDomain constructor",
+                "pr": 1753
+            },
+            {
+                "note": "Remove LibZeroExTransaction contract",
+                "pr": 1753
+            },
+            {
+                "note": "Update tests for arbitrary fee tokens (ZEIP-28).",
+                "pr": 1819
+            },
+            {
+                "note": "Update for new `marketXOrders` consolidation.",
+                "pr": 2042
+            },
+            {
+                "note": "Use built in selectors instead of hard coded constants",
+                "pr": 2055
+            },
+            {
+                "note": "Compile and export all contracts, artifacts, and wrappers by default",
+                "pr": 2055
+            }
+        ],
+        "timestamp": 1575296764
+    },
+    {
+        "version": "2.1.0-beta.4",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ],
+        "timestamp": 1575290197
+    },
     {
         "version": "2.1.0-beta.3",
         "changes": [

contracts/coordinator/CHANGELOG.md

@@ -5,6 +5,26 @@ Edit the package's CHANGELOG.json file only.
 
 CHANGELOG
 
+## v3.0.0 - _December 2, 2019_
+
+    * Drastically reduced bundle size by adding .npmignore, only exporting specific artifacts/wrappers/utils (#2330)
+    * Introduced new export CoordinatorRevertErrors (#2321)
+    * Added dependency on @0x/contracts-utils (#2321)
+    * Add chainId to domain separator (#1742)
+    * Inherit Exchange domain constants from `exchange-libs` to reduce code duplication (#1742)
+    * Update domain separator (#1742)
+    * Refactor contract to use new ITransactions interface (#1753)
+    * Add verifyingContractIfExists arg to LibEIP712CoordinatorDomain constructor (#1753)
+    * Remove LibZeroExTransaction contract (#1753)
+    * Update tests for arbitrary fee tokens (ZEIP-28). (#1819)
+    * Update for new `marketXOrders` consolidation. (#2042)
+    * Use built in selectors instead of hard coded constants (#2055)
+    * Compile and export all contracts, artifacts, and wrappers by default (#2055)
+
+## v2.1.0-beta.4 - _December 2, 2019_
+
+    * Dependencies updated
+
 ## v2.1.0-beta.3 - _November 20, 2019_
 
     * Dependencies updated

contracts/coordinator/package.json

@@ -1,6 +1,6 @@
 {
     "name": "@0x/contracts-coordinator",
-    "version": "2.1.0-beta.3",
+    "version": "3.0.0",
     "engines": {
         "node": ">=6.12"
     },
@@ -52,19 +52,19 @@
     },
     "homepage": "https://github.com/0xProject/0x-monorepo/contracts/extensions/README.md",
     "devDependencies": {
-        "@0x/abi-gen": "^4.4.0-beta.3",
-        "@0x/contracts-asset-proxy": "^2.3.0-beta.3",
-        "@0x/contracts-dev-utils": "^0.1.0-beta.3",
-        "@0x/contracts-erc20": "^2.3.0-beta.3",
-        "@0x/contracts-exchange": "^2.2.0-beta.3",
-        "@0x/contracts-gen": "^1.1.0-beta.3",
-        "@0x/contracts-test-utils": "^3.2.0-beta.3",
-        "@0x/dev-utils": "^2.4.0-beta.3",
-        "@0x/order-utils": "^8.5.0-beta.3",
-        "@0x/sol-compiler": "^3.2.0-beta.3",
+        "@0x/abi-gen": "^5.0.0",
+        "@0x/contracts-asset-proxy": "^3.0.0",
+        "@0x/contracts-dev-utils": "^1.0.0",
+        "@0x/contracts-erc20": "^3.0.0",
+        "@0x/contracts-exchange": "^3.0.0",
+        "@0x/contracts-gen": "^2.0.0",
+        "@0x/contracts-test-utils": "^4.0.0",
+        "@0x/dev-utils": "^3.0.0",
+        "@0x/order-utils": "^9.0.0",
+        "@0x/sol-compiler": "^4.0.0",
         "@0x/ts-doc-gen": "^0.0.22",
-        "@0x/tslint-config": "^3.1.0-beta.2",
-        "@0x/web3-wrapper": "^6.1.0-beta.2",
+        "@0x/tslint-config": "^4.0.0",
+        "@0x/web3-wrapper": "^7.0.0",
         "@types/lodash": "4.14.104",
         "@types/mocha": "^5.2.7",
         "@types/node": "*",
@@ -84,12 +84,16 @@
         "typescript": "3.0.1"
     },
     "dependencies": {
-        "@0x/base-contract": "^5.5.0-beta.3",
-        "@0x/contracts-utils": "^3.3.0-beta.3",
-        "@0x/types": "^2.5.0-beta.2",
-        "@0x/typescript-typings": "^4.4.0-beta.2",
-        "@0x/utils": "^4.6.0-beta.2",
-        "ethereum-types": "^2.2.0-beta.2"
+        "@0x/assert": "^3.0.0",
+        "@0x/base-contract": "^6.0.0",
+        "@0x/contract-addresses": "^4.0.0",
+        "@0x/contracts-utils": "^4.0.0",
+        "@0x/json-schemas": "^5.0.0",
+        "@0x/types": "^3.0.0",
+        "@0x/typescript-typings": "^5.0.0",
+        "@0x/utils": "^5.0.0",
+        "ethereum-types": "^3.0.0",
+        "http-status-codes": "^1.3.2"
     },
     "publishConfig": {
         "access": "public"

contracts/coordinator/src/client/index.ts

@@ -0,0 +1,820 @@
+import { SendTransactionOpts } from '@0x/base-contract';
+import { getContractAddressesForChainOrThrow } from '@0x/contract-addresses';
+import { ExchangeContract } from '@0x/contracts-exchange';
+import { ExchangeFunctionName } from '@0x/contracts-test-utils';
+import { devConstants } from '@0x/dev-utils';
+import { schemas } from '@0x/json-schemas';
+import { generatePseudoRandomSalt, signatureUtils } from '@0x/order-utils';
+import { Order, SignedOrder, SignedZeroExTransaction, ZeroExTransaction } from '@0x/types';
+import { BigNumber, fetchAsync } from '@0x/utils';
+import { Web3Wrapper } from '@0x/web3-wrapper';
+import { CallData, ContractAbi, SupportedProvider, TxData } from 'ethereum-types';
+import * as HttpStatus from 'http-status-codes';
+import { flatten } from 'lodash';
+
+import { artifacts } from '../artifacts';
+import { CoordinatorContract, CoordinatorRegistryContract } from '../wrappers';
+
+import { assert } from './utils/assert';
+import {
+    CoordinatorServerApprovalResponse,
+    CoordinatorServerCancellationResponse,
+    CoordinatorServerError,
+    CoordinatorServerErrorMsg,
+    CoordinatorServerResponse,
+} from './utils/coordinator_server_types';
+
+import { decorators } from './utils/decorators';
+
+export { CoordinatorServerErrorMsg, CoordinatorServerCancellationResponse };
+
+const DEFAULT_TX_DATA = {
+    gas: devConstants.GAS_LIMIT,
+    gasPrice: new BigNumber(1),
+    value: new BigNumber(150000), // DEFAULT_PROTOCOL_FEE_MULTIPLIER
+};
+
+// tx expiration time will be set to (now + default_approval - time_buffer)
+const DEFAULT_APPROVAL_EXPIRATION_TIME_SECONDS = 90;
+const DEFAULT_EXPIRATION_TIME_BUFFER_SECONDS = 30;
+
+/**
+ * This class includes all the functionality related to filling or cancelling orders through
+ * the 0x V2 Coordinator extension contract.
+ */
+export class CoordinatorClient {
+    public abi: ContractAbi = artifacts.Coordinator.compilerOutput.abi;
+    public chainId: number;
+    public address: string;
+    public exchangeAddress: string;
+    public registryAddress: string;
+
+    private readonly _web3Wrapper: Web3Wrapper;
+    private readonly _contractInstance: CoordinatorContract;
+    private readonly _registryInstance: CoordinatorRegistryContract;
+    private readonly _exchangeInstance: ExchangeContract;
+    private readonly _feeRecipientToEndpoint: { [feeRecipient: string]: string } = {};
+    private readonly _txDefaults: CallData = DEFAULT_TX_DATA;
+
+    /**
+     * Validates that the 0x transaction has been approved by all of the feeRecipients that correspond to each order in the transaction's Exchange calldata.
+     * Throws an error if the transaction approvals are not valid. Will not detect failures that would occur when the transaction is executed on the Exchange contract.
+     * @param transaction 0x transaction containing salt, signerAddress, and data.
+     * @param txOrigin Required signer of Ethereum transaction calling this function.
+     * @param transactionSignature Proof that the transaction has been signed by the signer.
+     * @param approvalSignatures Array of signatures that correspond to the feeRecipients of each order in the transaction's Exchange calldata.
+     */
+    @decorators.asyncZeroExErrorHandler
+    public async assertValidCoordinatorApprovalsOrThrowAsync(
+        transaction: ZeroExTransaction,
+        txOrigin: string,
+        transactionSignature: string,
+        approvalSignatures: string[],
+    ): Promise<void> {
+        assert.doesConformToSchema('transaction', transaction, schemas.zeroExTransactionSchema);
+        assert.isETHAddressHex('txOrigin', txOrigin);
+        assert.isHexString('transactionSignature', transactionSignature);
+        for (const approvalSignature of approvalSignatures) {
+            assert.isHexString('approvalSignature', approvalSignature);
+        }
+        return this._contractInstance
+            .assertValidCoordinatorApprovals(transaction, txOrigin, transactionSignature, approvalSignatures)
+            .callAsync();
+    }
+    /**
+     * Instantiate CoordinatorClient
+     * @param web3Wrapper Web3Wrapper instance to use.
+     * @param chainId Desired chainId.
+     * @param address The address of the Coordinator contract. If undefined, will
+     * default to the known address corresponding to the chainId.
+     * @param exchangeAddress The address of the Exchange contract. If undefined, will
+     * default to the known address corresponding to the chainId.
+     * @param registryAddress The address of the CoordinatorRegistry contract. If undefined, will
+     * default to the known address corresponding to the chainId.
+     */
+    constructor(
+        address: string,
+        provider: SupportedProvider,
+        chainId: number,
+        txDefaults?: Partial<TxData>,
+        exchangeAddress?: string,
+        registryAddress?: string,
+    ) {
+        this.chainId = chainId;
+        const contractAddresses = getContractAddressesForChainOrThrow(this.chainId);
+        this.address = address === undefined ? contractAddresses.coordinator : address;
+        this.exchangeAddress = exchangeAddress === undefined ? contractAddresses.exchange : exchangeAddress;
+        this.registryAddress = registryAddress === undefined ? contractAddresses.coordinatorRegistry : registryAddress;
+        this._web3Wrapper = new Web3Wrapper(provider);
+        this._txDefaults = { ...txDefaults, ...DEFAULT_TX_DATA };
+        this._contractInstance = new CoordinatorContract(
+            this.address,
+            this._web3Wrapper.getProvider(),
+            this._web3Wrapper.getContractDefaults(),
+        );
+        this._registryInstance = new CoordinatorRegistryContract(
+            this.registryAddress,
+            this._web3Wrapper.getProvider(),
+            this._web3Wrapper.getContractDefaults(),
+        );
+        this._exchangeInstance = new ExchangeContract(
+            this.exchangeAddress,
+            this._web3Wrapper.getProvider(),
+            this._web3Wrapper.getContractDefaults(),
+        );
+    }
+
+    /**
+     * Fills a signed order with an amount denominated in baseUnits of the taker asset. Under-the-hood, this
+     * method uses the `feeRecipientAddress` of the order to look up the coordinator server endpoint registered in the
+     * coordinator registry contract. It requests an approval from that coordinator server before
+     * submitting the order and approval as a 0x transaction to the coordinator extension contract. The coordinator extension
+     * contract validates approvals and then fills the order via the Exchange contract.
+     * @param   order                   An object that conforms to the Order interface.
+     * @param   takerAssetFillAmount    The amount of the order (in taker asset baseUnits) that you wish to fill.
+     * @param   signature               Signature corresponding to the order.
+     * @param   txData                  Transaction data. The `from` field should be the user Ethereum address who would like
+     *                                  to fill these orders. Must be available via the Provider supplied at instantiation.
+     * @param   sendTxOpts              Optional arguments for sending the transaction.
+     * @return  Transaction hash.
+     */
+    @decorators.asyncZeroExErrorHandler
+    public async fillOrderAsync(
+        order: Order,
+        takerAssetFillAmount: BigNumber,
+        signature: string,
+        txData: TxData,
+        sendTxOpts: Partial<SendTransactionOpts> = { shouldValidate: true },
+    ): Promise<string> {
+        assert.doesConformToSchema('order', order, schemas.orderSchema);
+        assert.isValidBaseUnitAmount('takerAssetFillAmount', takerAssetFillAmount);
+        return this._executeTxThroughCoordinatorAsync(
+            ExchangeFunctionName.FillOrder,
+            txData,
+            sendTxOpts,
+            [order],
+            order,
+            takerAssetFillAmount,
+            signature,
+        );
+    }
+
+    /**
+     * Attempts to fill a specific amount of an order. If the entire amount specified cannot be filled,
+     * the fill order is abandoned.
+     * @param   order                   An object that conforms to the Order interface.
+     * @param   takerAssetFillAmount    The amount of the order (in taker asset baseUnits) that you wish to fill.
+     * @param   signature               Signature corresponding to the order.
+     * @param   txData                  Transaction data. The `from` field should be the user Ethereum address who would like
+     *                                  to fill these orders. Must be available via the Provider supplied at instantiation.
+     * @param   sendTxOpts              Optional arguments for sending the transaction.
+     * @return  Transaction hash.
+     */
+    @decorators.asyncZeroExErrorHandler
+    public async fillOrKillOrderAsync(
+        order: Order,
+        takerAssetFillAmount: BigNumber,
+        signature: string,
+        txData: TxData,
+        sendTxOpts: Partial<SendTransactionOpts> = { shouldValidate: true },
+    ): Promise<string> {
+        assert.doesConformToSchema('order', order, schemas.orderSchema);
+        assert.isValidBaseUnitAmount('takerAssetFillAmount', takerAssetFillAmount);
+        return this._executeTxThroughCoordinatorAsync(
+            ExchangeFunctionName.FillOrKillOrder,
+            txData,
+            sendTxOpts,
+            [order],
+            order,
+            takerAssetFillAmount,
+            signature,
+        );
+    }
+
+    /**
+     * Batch version of fillOrderAsync. Executes multiple fills atomically in a single transaction.
+     * If any `feeRecipientAddress` in the batch is not registered to a coordinator server through the CoordinatorRegistryContract, the whole batch fails.
+     * @param   orders                  An array of orders to fill.
+     * @param   takerAssetFillAmounts   The amounts of the orders (in taker asset baseUnits) that you wish to fill.
+     * @param   signatures              Signatures corresponding to the orders.
+     * @param   txData                  Transaction data. The `from` field should be the user Ethereum address who would like
+     *                                  to fill these orders. Must be available via the Provider supplied at instantiation.
+     * @param   sendTxOpts              Optional arguments for sending the transaction.
+     * @return  Transaction hash.
+     */
+    @decorators.asyncZeroExErrorHandler
+    public async batchFillOrdersAsync(
+        orders: Order[],
+        takerAssetFillAmounts: BigNumber[],
+        signatures: string[],
+        txData: TxData,
+        sendTxOpts?: Partial<SendTransactionOpts>,
+    ): Promise<string> {
+        return this._batchFillAsync(
+            ExchangeFunctionName.BatchFillOrders,
+            orders,
+            takerAssetFillAmounts,
+            signatures,
+            txData,
+            sendTxOpts,
+        );
+    }
+    /**
+     * No throw version of batchFillOrdersAsync
+     * @param   orders                  An array of orders to fill.
+     * @param   takerAssetFillAmounts   The amounts of the orders (in taker asset baseUnits) that you wish to fill.
+     * @param   signatures              Signatures corresponding to the orders.
+     * @param   txData                  Transaction data. The `from` field should be the user Ethereum address who would like
+     *                                  to fill these orders. Must be available via the Provider supplied at instantiation.
+     * @param   sendTxOpts              Optional arguments for sending the transaction.
+     * @return  Transaction hash.
+     */
+
+    public async batchFillOrdersNoThrowAsync(
+        orders: Order[],
+        takerAssetFillAmounts: BigNumber[],
+        signatures: string[],
+        txData: TxData,
+        sendTxOpts?: Partial<SendTransactionOpts>,
+    ): Promise<string> {
+        return this._batchFillAsync(
+            ExchangeFunctionName.BatchFillOrdersNoThrow,
+            orders,
+            takerAssetFillAmounts,
+            signatures,
+            txData,
+            sendTxOpts,
+        );
+    }
+    /**
+     * Batch version of fillOrKillOrderAsync. Executes multiple fills atomically in a single transaction.
+     * @param   orders                  An array of orders to fill.
+     * @param   takerAssetFillAmounts   The amounts of the orders (in taker asset baseUnits) that you wish to fill.
+     * @param   signatures              Signatures corresponding to the orders.
+     * @param   txData                  Transaction data. The `from` field should be the user Ethereum address who would like
+     *                                  to fill these orders. Must be available via the Provider supplied at instantiation.
+     * @param   sendTxOpts              Optional arguments for sending the transaction.
+     * @return  Transaction hash.
+     */
+    @decorators.asyncZeroExErrorHandler
+    public async batchFillOrKillOrdersAsync(
+        orders: Order[],
+        takerAssetFillAmounts: BigNumber[],
+        signatures: string[],
+        txData: TxData,
+        sendTxOpts?: Partial<SendTransactionOpts>,
+    ): Promise<string> {
+        return this._batchFillAsync(
+            ExchangeFunctionName.BatchFillOrKillOrders,
+            orders,
+            takerAssetFillAmounts,
+            signatures,
+            txData,
+            sendTxOpts,
+        );
+    }
+
+    /**
+     * Executes multiple calls of fillOrder until total amount of makerAsset is bought by taker.
+     * If any fill reverts, the error is caught and ignored. Finally, reverts if < makerAssetFillAmount has been bought.
+     * NOTE: This function does not enforce that the makerAsset is the same for each order.
+     * @param orders                Array of order specifications.
+     * @param makerAssetFillAmount  Desired amount of makerAsset to buy.
+     * @param signatures            Proofs that orders have been signed by makers.
+     * @param txData                Transaction data. The `from` field should be the user Ethereum address who would like
+     *                              to fill these orders. Must be available via the Provider supplied at instantiation.
+     * @param sendTxOpts            Optional arguments for sending the transaction.
+     * @return  Transaction hash.
+     */
+    @decorators.asyncZeroExErrorHandler
+    public async marketBuyOrdersFillOrKillAsync(
+        orders: Order[],
+        makerAssetFillAmount: BigNumber,
+        signatures: string[],
+        txData: TxData,
+        sendTxOpts: SendTransactionOpts = { shouldValidate: true },
+    ): Promise<string> {
+        return this._marketBuySellOrdersAsync(
+            ExchangeFunctionName.MarketBuyOrdersFillOrKill,
+            orders,
+            makerAssetFillAmount,
+            signatures,
+            txData,
+            sendTxOpts,
+        );
+    }
+
+    /**
+     * No throw version of marketBuyOrdersFillOrKillAsync
+     * @param   orders               An array of orders to fill.
+     * @param   makerAssetFillAmount Maker asset fill amount.
+     * @param   signatures           Signatures corresponding to the orders.
+     * @param   txData               Transaction data. The `from` field should be the user Ethereum address who would like
+     *                               to fill these orders. Must be available via the Provider supplied at instantiation.
+     * @param   sendTxOpts           Optional arguments for sending the transaction.
+     * @return  Transaction hash.
+     */
+    @decorators.asyncZeroExErrorHandler
+    public async marketBuyOrdersNoThrowAsync(
+        orders: Order[],
+        makerAssetFillAmount: BigNumber,
+        signatures: string[],
+        txData: TxData,
+        sendTxOpts: SendTransactionOpts = { shouldValidate: true },
+    ): Promise<string> {
+        return this._marketBuySellOrdersAsync(
+            ExchangeFunctionName.MarketBuyOrdersNoThrow,
+            orders,
+            makerAssetFillAmount,
+            signatures,
+            txData,
+            sendTxOpts,
+        );
+    }
+    /**
+     * Executes multiple calls of fillOrder until total amount of takerAsset is sold by taker.
+     * If any fill reverts, the error is caught and ignored. Finally, reverts if < takerAssetFillAmount has been sold.
+     * NOTE: This function does not enforce that the takerAsset is the same for each order.
+     * @param orders                 Array of order specifications.
+     * @param takerAssetFillAmount   Desired amount of takerAsset to sell.
+     * @param signatures             Proofs that orders have been signed by makers.
+     * @param txData                 Transaction data. The `from` field should be the user Ethereum address who would like
+     *                               to fill these orders. Must be available via the Provider supplied at instantiation.
+     * @param sendTxOpts             Optional arguments for sending the transaction.
+     * @return  Transaction hash.
+     */
+    @decorators.asyncZeroExErrorHandler
+    public async marketSellOrdersFillOrKillAsync(
+        orders: Order[],
+        takerAssetFillAmount: BigNumber,
+        signatures: string[],
+        txData: TxData,
+        sendTxOpts: SendTransactionOpts = { shouldValidate: true },
+    ): Promise<string> {
+        return this._marketBuySellOrdersAsync(
+            ExchangeFunctionName.MarketSellOrdersFillOrKill,
+            orders,
+            takerAssetFillAmount,
+            signatures,
+            txData,
+            sendTxOpts,
+        );
+    }
+
+    /**
+     * No throw version of marketSellOrdersAsync
+     * @param   orders               An array of orders to fill.
+     * @param   takerAssetFillAmount Taker asset fill amount.
+     * @param   signatures           Signatures corresponding to the orders.
+     * @param   txData               Transaction data. The `from` field should be the user Ethereum address who would like
+     *                               to fill these orders. Must be available via the Provider supplied at instantiation.
+     * @param   sendTxOpts           Optional arguments for sending the transaction.
+     * @return  Transaction hash.
+     */
+    @decorators.asyncZeroExErrorHandler
+    public async marketSellOrdersNoThrowAsync(
+        orders: Order[],
+        takerAssetFillAmount: BigNumber,
+        signatures: string[],
+        txData: TxData,
+        sendTxOpts: SendTransactionOpts = { shouldValidate: true },
+    ): Promise<string> {
+        return this._marketBuySellOrdersAsync(
+            ExchangeFunctionName.MarketSellOrdersNoThrow,
+            orders,
+            takerAssetFillAmount,
+            signatures,
+            txData,
+            sendTxOpts,
+        );
+    }
+
+    /**
+     * Cancels an order on-chain by submitting an Ethereum transaction.
+     * @param   order       An object that conforms to the Order interface. The order you would like to cancel.
+     * @param   txData      Transaction data. The `from` field should be the maker's Ethereum address. Must be available
+     *                      via the Provider supplied at instantiation.
+     * @param   sendTxOpts  Optional arguments for sending the transaction.
+     * @return  Transaction hash.
+     */
+    @decorators.asyncZeroExErrorHandler
+    public async hardCancelOrderAsync(
+        order: Order,
+        txData: TxData,
+        sendTxOpts: SendTransactionOpts = { shouldValidate: true },
+    ): Promise<string> {
+        assert.doesConformToSchema('order', order, schemas.orderSchema);
+        return this._executeTxThroughCoordinatorAsync(
+            ExchangeFunctionName.CancelOrder,
+            txData,
+            sendTxOpts,
+            [order],
+            order,
+        );
+    }
+
+    /**
+     * Batch version of hardCancelOrderAsync. Cancels orders on-chain by submitting an Ethereum transaction.
+     * Executes multiple cancels atomically in a single transaction.
+     * @param   orders      An array of orders to cancel.
+     * @param   txData      Transaction data. The `from` field should be the maker's Ethereum address. Must be available
+     *                      via the Provider supplied at instantiation.
+     * @param   sendTxOpts  Optional arguments for sending the transaction.
+     * @return  Transaction hash.
+     */
+    @decorators.asyncZeroExErrorHandler
+    public async batchHardCancelOrdersAsync(
+        orders: Order[],
+        txData: TxData,
+        sendTxOpts: SendTransactionOpts = { shouldValidate: true },
+    ): Promise<string> {
+        assert.doesConformToSchema('orders', orders, schemas.ordersSchema);
+        return this._executeTxThroughCoordinatorAsync(
+            ExchangeFunctionName.BatchCancelOrders,
+            txData,
+            sendTxOpts,
+            orders,
+            orders,
+        );
+    }
+
+    /**
+     * Cancels orders on-chain by submitting an Ethereum transaction.
+     * Cancels all orders created by makerAddress with a salt less than or equal to the targetOrderEpoch
+     * and senderAddress equal to coordinator extension contract address.
+     * @param   targetOrderEpoch    Target order epoch.
+     * @param   txData              Transaction data. The `from` field should be the maker's Ethereum address. Must be available
+     *                              via the Provider supplied at instantiation.
+     * @param   sendTxOpts          Optional arguments for sending the transaction.
+     * @return  Transaction hash.
+     */
+    @decorators.asyncZeroExErrorHandler
+    public async hardCancelOrdersUpToAsync(
+        targetOrderEpoch: BigNumber,
+        txData: TxData,
+        sendTxOpts: SendTransactionOpts = { shouldValidate: true },
+    ): Promise<string> {
+        assert.isBigNumber('targetOrderEpoch', targetOrderEpoch);
+        return this._executeTxThroughCoordinatorAsync(
+            ExchangeFunctionName.CancelOrdersUpTo,
+            txData,
+            sendTxOpts,
+            [],
+            targetOrderEpoch,
+        );
+    }
+    /**
+     * Soft cancel a given order.
+     * Soft cancels are recorded only on coordinator operator servers and do not involve an Ethereum transaction.
+     * See [soft cancels](https://github.com/0xProject/0x-protocol-specification/blob/master/v2/coordinator-specification.md#soft-cancels).
+     * @param   order           An object that conforms to the Order or SignedOrder interface. The order you would like to cancel.
+     * @return  CoordinatorServerCancellationResponse. See [Cancellation Response](https://github.com/0xProject/0x-protocol-specification/blob/master/v2/coordinator-specification.md#response).
+     */
+    @decorators.asyncZeroExErrorHandler
+    public async softCancelAsync(order: Order): Promise<CoordinatorServerCancellationResponse> {
+        assert.doesConformToSchema('order', order, schemas.orderSchema);
+        assert.isETHAddressHex('feeRecipientAddress', order.feeRecipientAddress);
+        assert.isSenderAddressAsync('makerAddress', order.makerAddress, this._web3Wrapper);
+
+        const data = this._exchangeInstance.cancelOrder(order).getABIEncodedTransactionData();
+        const transaction = await this._generateSignedZeroExTransactionAsync(data, order.makerAddress);
+        const endpoint = await this._getServerEndpointOrThrowAsync(order);
+
+        const response = await this._executeServerRequestAsync(transaction, order.makerAddress, endpoint);
+        if (response.isError) {
+            const approvedOrders = new Array();
+            const cancellations = new Array();
+            const errors = [
+                {
+                    ...response,
+                    orders: [order],
+                },
+            ];
+            throw new CoordinatorServerError(
+                CoordinatorServerErrorMsg.CancellationFailed,
+                approvedOrders,
+                cancellations,
+                errors,
+            );
+        } else {
+            return response.body as CoordinatorServerCancellationResponse;
+        }
+    }
+    /**
+     * Batch version of softCancelOrderAsync. Requests multiple soft cancels
+     * @param   orders                An array of orders to cancel.
+     * @return  CoordinatorServerCancellationResponse. See [Cancellation Response](https://github.com/0xProject/0x-protocol-specification/blob/master/v2/coordinator-specification.md#response).
+     */
+    @decorators.asyncZeroExErrorHandler
+    public async batchSoftCancelAsync(orders: SignedOrder[]): Promise<CoordinatorServerCancellationResponse[]> {
+        assert.doesConformToSchema('orders', orders, schemas.ordersSchema);
+        const makerAddress = getMakerAddressOrThrow(orders);
+        assert.isSenderAddressAsync('makerAddress', makerAddress, this._web3Wrapper);
+        const data = this._exchangeInstance.batchCancelOrders(orders).getABIEncodedTransactionData();
+        const transaction = await this._generateSignedZeroExTransactionAsync(data, makerAddress);
+
+        // make server requests
+        const errorResponses: CoordinatorServerResponse[] = [];
+        const successResponses: CoordinatorServerCancellationResponse[] = [];
+        const serverEndpointsToOrders = await this._mapServerEndpointsToOrdersAsync(orders);
+        for (const endpoint of Object.keys(serverEndpointsToOrders)) {
+            const response = await this._executeServerRequestAsync(transaction, makerAddress, endpoint);
+            if (response.isError) {
+                errorResponses.push(response);
+            } else {
+                successResponses.push(response.body as CoordinatorServerCancellationResponse);
+            }
+        }
+
+        // if no errors
+        if (errorResponses.length === 0) {
+            return successResponses;
+        } else {
+            // lookup orders with errors
+            const errorsWithOrders = errorResponses.map(resp => {
+                const endpoint = resp.coordinatorOperator;
+                const _orders = serverEndpointsToOrders[endpoint];
+                return {
+                    ...resp,
+                    orders: _orders,
+                };
+            });
+
+            const approvedOrders = new Array();
+            const cancellations = successResponses;
+            // return errors and approvals
+            throw new CoordinatorServerError(
+                CoordinatorServerErrorMsg.CancellationFailed,
+                approvedOrders,
+                cancellations,
+                errorsWithOrders,
+            );
+        }
+    }
+
+    /**
+     * Recovers the address of a signer given a hash and signature.
+     * @param hash Any 32 byte hash.
+     * @param signature Proof that the hash has been signed by signer.
+     * @returns Signer address.
+     */
+    @decorators.asyncZeroExErrorHandler
+    public async getSignerAddressAsync(hash: string, signature: string): Promise<string> {
+        assert.isHexString('hash', hash);
+        assert.isHexString('signature', signature);
+        const signerAddress = await this._contractInstance.getSignerAddress(hash, signature).callAsync();
+        return signerAddress;
+    }
+
+    private async _marketBuySellOrdersAsync(
+        exchangeFn: ExchangeFunctionName,
+        orders: Order[],
+        assetFillAmount: BigNumber,
+        signatures: string[],
+        txData: TxData,
+        sendTxOpts: SendTransactionOpts = { shouldValidate: true },
+    ): Promise<string> {
+        assert.doesConformToSchema('orders', orders, schemas.ordersSchema);
+        assert.isBigNumber('assetFillAmount', assetFillAmount);
+        return this._executeTxThroughCoordinatorAsync(
+            exchangeFn,
+            txData,
+            sendTxOpts,
+            orders,
+            orders,
+            assetFillAmount,
+            signatures,
+        );
+    }
+
+    private async _batchFillAsync(
+        exchangeFn: ExchangeFunctionName,
+        orders: Order[],
+        takerAssetFillAmounts: BigNumber[],
+        signatures: string[],
+        txData: TxData,
+        sendTxOpts: SendTransactionOpts = { shouldValidate: true },
+    ): Promise<string> {
+        assert.doesConformToSchema('orders', orders, schemas.ordersSchema);
+        takerAssetFillAmounts.forEach(takerAssetFillAmount =>
+            assert.isValidBaseUnitAmount('takerAssetFillAmount', takerAssetFillAmount),
+        );
+        return this._executeTxThroughCoordinatorAsync(
+            exchangeFn,
+            txData,
+            sendTxOpts,
+            orders,
+            orders,
+            takerAssetFillAmounts,
+            signatures,
+        );
+    }
+
+    private async _executeTxThroughCoordinatorAsync(
+        exchangeFn: ExchangeFunctionName,
+        txData: TxData,
+        sendTxOpts: Partial<SendTransactionOpts>,
+        ordersNeedingApprovals: Order[],
+        ...args: any[] // tslint:disable-line:trailing-comma
+    ): Promise<string> {
+        assert.isETHAddressHex('takerAddress', txData.from);
+        await assert.isSenderAddressAsync('takerAddress', txData.from, this._web3Wrapper);
+
+        // get ABI encoded transaction data for the desired exchange method
+        const data = (this._exchangeInstance as any)[exchangeFn](...args).getABIEncodedTransactionData();
+
+        // generate and sign a ZeroExTransaction
+        const signedZrxTx = await this._generateSignedZeroExTransactionAsync(data, txData.from, txData.gasPrice);
+
+        // get approval signatures from registered coordinator operators
+        const approvalSignatures = await this._getApprovalsAsync(signedZrxTx, ordersNeedingApprovals, txData.from);
+
+        // execute the transaction through the Coordinator Contract
+        const txDataWithDefaults = {
+            ...this._txDefaults,
+            ...txData, // override defaults
+        };
+        const txHash = this._contractInstance
+            .executeTransaction(signedZrxTx, txData.from, signedZrxTx.signature, approvalSignatures)
+            .sendTransactionAsync(txDataWithDefaults, sendTxOpts);
+        return txHash;
+    }
+
+    private async _generateSignedZeroExTransactionAsync(
+        data: string,
+        signerAddress: string,
+        gasPrice?: BigNumber | string | number,
+    ): Promise<SignedZeroExTransaction> {
+        const transaction: ZeroExTransaction = {
+            salt: generatePseudoRandomSalt(),
+            signerAddress,
+            data,
+            domain: {
+                verifyingContract: this.exchangeAddress,
+                chainId: await this._web3Wrapper.getChainIdAsync(),
+            },
+            expirationTimeSeconds: new BigNumber(
+                Math.floor(Date.now() / 1000) +
+                    DEFAULT_APPROVAL_EXPIRATION_TIME_SECONDS -
+                    DEFAULT_EXPIRATION_TIME_BUFFER_SECONDS,
+            ),
+            gasPrice: gasPrice ? new BigNumber(gasPrice) : new BigNumber(1),
+        };
+        const signedZrxTx = await signatureUtils.ecSignTransactionAsync(
+            this._web3Wrapper.getProvider(),
+            transaction,
+            transaction.signerAddress,
+        );
+        return signedZrxTx;
+    }
+
+    private async _getApprovalsAsync(
+        transaction: SignedZeroExTransaction,
+        orders: Order[],
+        txOrigin: string,
+    ): Promise<string[]> {
+        const coordinatorOrders = orders.filter(o => o.senderAddress === this.address);
+        if (coordinatorOrders.length === 0) {
+            return [];
+        }
+        const serverEndpointsToOrders = await this._mapServerEndpointsToOrdersAsync(coordinatorOrders);
+
+        // make server requests
+        const errorResponses: CoordinatorServerResponse[] = [];
+        const approvalResponses: CoordinatorServerResponse[] = [];
+        for (const endpoint of Object.keys(serverEndpointsToOrders)) {
+            const response = await this._executeServerRequestAsync(transaction, txOrigin, endpoint);
+            if (response.isError) {
+                errorResponses.push(response);
+            } else {
+                approvalResponses.push(response);
+            }
+        }
+
+        // if no errors
+        if (errorResponses.length === 0) {
+            // concatenate all approval responses
+            return approvalResponses.reduce(
+                (accumulator, response) =>
+                    accumulator.concat((response.body as CoordinatorServerApprovalResponse).signatures),
+                [] as string[],
+            );
+        } else {
+            // format errors and approvals
+            // concatenate approvals
+            const notCoordinatorOrders = orders.filter(o => o.senderAddress !== this.address);
+            const approvedOrdersNested = approvalResponses.map(resp => {
+                const endpoint = resp.coordinatorOperator;
+                return serverEndpointsToOrders[endpoint];
+            });
+            const approvedOrders = flatten(approvedOrdersNested.concat(notCoordinatorOrders));
+
+            // lookup orders with errors
+            const errorsWithOrders = errorResponses.map(resp => {
+                const endpoint = resp.coordinatorOperator;
+                return {
+                    ...resp,
+                    orders: serverEndpointsToOrders[endpoint],
+                };
+            });
+
+            // throw informative error
+            const cancellations = new Array();
+            throw new CoordinatorServerError(
+                CoordinatorServerErrorMsg.FillFailed,
+                approvedOrders,
+                cancellations,
+                errorsWithOrders,
+            );
+        }
+    }
+
+    private async _getServerEndpointOrThrowAsync(order: Order): Promise<string> {
+        const cached = this._feeRecipientToEndpoint[order.feeRecipientAddress];
+        const endpoint =
+            cached !== undefined
+                ? cached
+                : await _fetchServerEndpointOrThrowAsync(order.feeRecipientAddress, this._registryInstance);
+        return endpoint;
+
+        async function _fetchServerEndpointOrThrowAsync(
+            feeRecipient: string,
+            registryInstance: CoordinatorRegistryContract,
+        ): Promise<string> {
+            const coordinatorOperatorEndpoint = await registryInstance.getCoordinatorEndpoint(feeRecipient).callAsync();
+            if (coordinatorOperatorEndpoint === '' || coordinatorOperatorEndpoint === undefined) {
+                throw new Error(
+                    `No Coordinator server endpoint found in Coordinator Registry for feeRecipientAddress: ${feeRecipient}. Registry contract address: [${
+                        registryInstance.address
+                    }] Order: [${JSON.stringify(order)}]`,
+                );
+            }
+            return coordinatorOperatorEndpoint;
+        }
+    }
+
+    private async _executeServerRequestAsync(
+        signedTransaction: SignedZeroExTransaction,
+        txOrigin: string,
+        endpoint: string,
+    ): Promise<CoordinatorServerResponse> {
+        const requestPayload = {
+            signedTransaction,
+            txOrigin,
+        };
+        const response = await fetchAsync(`${endpoint}/v2/request_transaction?chainId=${this.chainId}`, {
+            body: JSON.stringify(requestPayload),
+            method: 'POST',
+            headers: {
+                'Content-Type': 'application/json; charset=utf-8',
+            },
+        });
+
+        const isError = response.status !== HttpStatus.OK;
+        const isValidationError = response.status === HttpStatus.BAD_REQUEST;
+        const json = isError && !isValidationError ? undefined : await response.json();
+
+        const result = {
+            isError,
+            status: response.status,
+            body: isError ? undefined : json,
+            error: isError ? json : undefined,
+            request: requestPayload,
+            coordinatorOperator: endpoint,
+        };
+
+        return result;
+    }
+
+    private async _mapServerEndpointsToOrdersAsync(
+        coordinatorOrders: Order[],
+    ): Promise<{ [endpoint: string]: Order[] }> {
+        const groupByFeeRecipient: { [feeRecipient: string]: Order[] } = {};
+        for (const order of coordinatorOrders) {
+            const feeRecipient = order.feeRecipientAddress;
+            if (groupByFeeRecipient[feeRecipient] === undefined) {
+                groupByFeeRecipient[feeRecipient] = [] as Order[];
+            }
+            groupByFeeRecipient[feeRecipient].push(order);
+        }
+        const serverEndpointsToOrders: { [endpoint: string]: Order[] } = {};
+        for (const orders of Object.values(groupByFeeRecipient)) {
+            const endpoint = await this._getServerEndpointOrThrowAsync(orders[0]);
+            if (serverEndpointsToOrders[endpoint] === undefined) {
+                serverEndpointsToOrders[endpoint] = [];
+            }
+            serverEndpointsToOrders[endpoint] = serverEndpointsToOrders[endpoint].concat(orders);
+        }
+        return serverEndpointsToOrders;
+    }
+}
+
+function getMakerAddressOrThrow(orders: Array<Order | SignedOrder>): string {
+    const uniqueMakerAddresses = new Set(orders.map(o => o.makerAddress));
+    if (uniqueMakerAddresses.size > 1) {
+        throw new Error(`All orders in a batch must have the same makerAddress`);
+    }
+    return orders[0].makerAddress;
+}
+
+// tslint:disable:max-file-line-count

contracts/coordinator/src/client/utils/assert.ts

@@ -4,7 +4,6 @@ import { Schema } from '@0x/json-schemas'; // tslint:disable-line:no-unused-vari
 import { Order } from '@0x/types'; // tslint:disable-line:no-unused-variable
 import { BigNumber } from '@0x/utils'; // tslint:disable-line:no-unused-variable
 import { Web3Wrapper } from '@0x/web3-wrapper';
-import * as _ from 'lodash';
 
 export const assert = {
     ...sharedAssert,

contracts/coordinator/src/client/utils/coordinator_server_types.ts

@@ -2,10 +2,6 @@ import { Order, SignedOrder, SignedZeroExTransaction } from '@0x/types';
 import { BigNumber } from '@0x/utils';
 
 export interface CoordinatorServerApprovalResponse {
-    signatures: string[];
-    expirationTimeSeconds: BigNumber[];
-}
-export interface CoordinatorServerApprovalRawResponse {
     signatures: string[];
     expirationTimeSeconds: BigNumber;
 }
@@ -24,7 +20,7 @@ export interface CoordinatorOutstandingFillSignatures {
 export interface CoordinatorServerResponse {
     isError: boolean;
     status: number;
-    body?: CoordinatorServerCancellationResponse | CoordinatorServerApprovalRawResponse;
+    body?: CoordinatorServerCancellationResponse | CoordinatorServerApprovalResponse;
     error?: any;
     request: CoordinatorServerRequest;
     coordinatorOperator: string;
@@ -38,12 +34,12 @@ export interface CoordinatorServerRequest {
 
 export class CoordinatorServerError extends Error {
     public message: CoordinatorServerErrorMsg;
-    public approvedOrders?: SignedOrder[] = [];
+    public approvedOrders?: Order[] = [];
     public cancellations?: CoordinatorServerCancellationResponse[] = [];
     public errors: CoordinatorServerResponse[];
     constructor(
         message: CoordinatorServerErrorMsg,
-        approvedOrders: SignedOrder[],
+        approvedOrders: Order[],
         cancellations: CoordinatorServerCancellationResponse[],
         errors: CoordinatorServerResponse[],
     ) {

contracts/coordinator/src/index.ts

@@ -7,10 +7,19 @@ export {
     LibCoordinatorRichErrorsContract,
     LibEIP712CoordinatorDomainContract,
 } from './wrappers';
-export import CoordinatorRevertErrors = require('./revert_errors');
+export { CoordinatorRevertErrors } from '@0x/utils';
+export { CoordinatorServerCancellationResponse } from './client/index';
 export { ApprovalFactory } from './approval_factory';
 export { SignedCoordinatorApproval } from './types';
-export { SignatureType, SignedZeroExTransaction, EIP712DomainWithDefaultSchema } from '@0x/types';
+export {
+    Order,
+    SignedOrder,
+    SignatureType,
+    SignedZeroExTransaction,
+    EIP712DomainWithDefaultSchema,
+    ZeroExTransaction,
+} from '@0x/types';
+export { AwaitTransactionSuccessOpts, SendTransactionOpts } from '@0x/base-contract';
 export {
     ContractArtifact,
     ContractChains,
@@ -38,4 +47,20 @@ export {
     ConstructorStateMutability,
     TupleDataItem,
     StateMutability,
+    SupportedProvider,
+    TxData,
+    TxDataPayable,
+    Web3JsProvider,
+    GanacheProvider,
+    EIP1193Provider,
+    ZeroExProvider,
+    EIP1193Event,
+    JSONRPCRequestPayload,
+    JSONRPCErrorCallback,
+    Web3JsV1Provider,
+    Web3JsV2Provider,
+    Web3JsV3Provider,
+    JSONRPCResponsePayload,
+    JSONRPCResponseError,
 } from 'ethereum-types';
+export { CoordinatorClient, CoordinatorServerErrorMsg } from './client/index';

contracts/coordinator/src/types.ts

@@ -1,4 +1,5 @@
 import { SignedZeroExTransaction } from '@0x/types';
+import { BigNumber } from '@0x/utils';
 
 export interface CoordinatorApproval {
     transaction: SignedZeroExTransaction;
@@ -8,3 +9,9 @@ export interface CoordinatorApproval {
 export interface SignedCoordinatorApproval extends CoordinatorApproval {
     signature: string;
 }
+
+export interface CoordinatorTransaction {
+    salt: BigNumber;
+    signerAddress: string;
+    data: string;
+}

contracts/coordinator/test/mixins.ts

@@ -12,9 +12,7 @@ import {
 } from '@0x/contracts-test-utils';
 import { LibBytesRevertErrors } from '@0x/contracts-utils';
 import { SignatureType, SignedOrder } from '@0x/types';
-import { BigNumber } from '@0x/utils';
-
-import CoordinatorRevertErrors = require('../src/revert_errors');
+import { BigNumber, CoordinatorRevertErrors } from '@0x/utils';
 
 import { ApprovalFactory } from '../src/approval_factory';
 

contracts/dev-utils/CHANGELOG.json

@@ -1,4 +1,55 @@
 [
+    {
+        "version": "1.0.0",
+        "changes": [
+            {
+                "note": "Drastically reduced bundle size by adding .npmignore, only exporting specific artifacts/wrappers/utils",
+                "pr": 2330
+            },
+            {
+                "note": "Add new method getOrderHash() to DevUtils contract",
+                "pr": 2321
+            },
+            {
+                "note": "Add new method getTransactionHash() to DevUtils contract",
+                "pr": 2321
+            },
+            {
+                "note": "Add `encodeStaticCallAssetData` and `decodeStaticCallAssetData` in LibAssetData",
+                "pr": 2034
+            },
+            {
+                "note": "Add `revertIfInvalidAssetData` in LibAssetData",
+                "pr": 2034
+            },
+            {
+                "note": "Use built in selectors instead of hard coded constants",
+                "pr": 2055
+            },
+            {
+                "note": "Compile and export all contracts, artifacts, and wrappers by default",
+                "pr": 2055
+            },
+            {
+                "note": "Add `marketBuy/SellOrdersNoThrow` and `marketBuy/SellOrdersFillOrKill` to `LibTransactionDecoder`.",
+                "pr": 2075
+            },
+            {
+                "note": "`run_mocha` package script runs with `UNLIMITED_CONTRACT_SIZE=true` environment variable.",
+                "pr": 2075
+            }
+        ],
+        "timestamp": 1575296764
+    },
+    {
+        "version": "0.1.0-beta.4",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ],
+        "timestamp": 1575290197
+    },
     {
         "version": "0.1.0-beta.3",
         "changes": [

contracts/dev-utils/CHANGELOG.md

@@ -5,6 +5,22 @@ Edit the package's CHANGELOG.json file only.
 
 CHANGELOG
 
+## v1.0.0 - _December 2, 2019_
+
+    * Drastically reduced bundle size by adding .npmignore, only exporting specific artifacts/wrappers/utils (#2330)
+    * Add new method getOrderHash() to DevUtils contract (#2321)
+    * Add new method getTransactionHash() to DevUtils contract (#2321)
+    * Add `encodeStaticCallAssetData` and `decodeStaticCallAssetData` in LibAssetData (#2034)
+    * Add `revertIfInvalidAssetData` in LibAssetData (#2034)
+    * Use built in selectors instead of hard coded constants (#2055)
+    * Compile and export all contracts, artifacts, and wrappers by default (#2055)
+    * Add `marketBuy/SellOrdersNoThrow` and `marketBuy/SellOrdersFillOrKill` to `LibTransactionDecoder`. (#2075)
+    * `run_mocha` package script runs with `UNLIMITED_CONTRACT_SIZE=true` environment variable. (#2075)
+
+## v0.1.0-beta.4 - _December 2, 2019_
+
+    * Dependencies updated
+
 ## v0.1.0-beta.3 - _November 20, 2019_
 
     * Dependencies updated

contracts/dev-utils/package.json

@@ -1,6 +1,6 @@
 {
     "name": "@0x/contracts-dev-utils",
-    "version": "0.1.0-beta.3",
+    "version": "1.0.0",
     "engines": {
         "node": ">=6.12"
     },
@@ -41,13 +41,14 @@
     },
     "homepage": "https://github.com/0xProject/0x-monorepo/contracts/dev-utils/README.md",
     "devDependencies": {
-        "@0x/abi-gen": "^4.4.0-beta.3",
-        "@0x/assert": "^2.2.0-beta.2",
-        "@0x/contracts-gen": "^1.1.0-beta.3",
-        "@0x/sol-compiler": "^3.2.0-beta.3",
+        "@0x/abi-gen": "^5.0.0",
+        "@0x/assert": "^3.0.0",
+        "@0x/contracts-gen": "^2.0.0",
+        "@0x/sol-compiler": "^4.0.0",
         "@0x/ts-doc-gen": "^0.0.22",
-        "@0x/tslint-config": "^3.1.0-beta.2",
+        "@0x/tslint-config": "^4.0.0",
         "@types/node": "*",
+        "ethereum-types": "^3.0.0",
         "ethers": "~4.0.4",
         "npm-run-all": "^4.1.2",
         "shx": "^0.2.2",
@@ -58,8 +59,7 @@
         "typescript": "3.0.1"
     },
     "dependencies": {
-        "@0x/base-contract": "^5.5.0-beta.3",
-        "ethereum-types": "^2.2.0-beta.2"
+        "@0x/base-contract": "^6.0.0"
     },
     "publishConfig": {
         "access": "public"

contracts/erc1155/CHANGELOG.json

@@ -1,4 +1,31 @@
 [
+    {
+        "version": "2.0.0",
+        "changes": [
+            {
+                "note": "Drastically reduced bundle size by adding .npmignore, only exporting specific artifacts/wrappers/utils",
+                "pr": 2330
+            },
+            {
+                "note": "Add `mintKnownFungibleTokensAsync()`, `isNonFungibleItemAsync()`, `isFungibleItemAsync()`, `getOwnerOfAsync()`, `getBalanceAsync()` to `Erc1155Wrapper`.",
+                "pr": 1819
+            },
+            {
+                "note": "Replaced `SafeMath` with `LibSafeMath`",
+                "pr": 2254
+            }
+        ],
+        "timestamp": 1575296764
+    },
+    {
+        "version": "1.2.0-beta.4",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ],
+        "timestamp": 1575290197
+    },
     {
         "version": "1.2.0-beta.3",
         "changes": [

contracts/erc1155/CHANGELOG.md

@@ -5,6 +5,16 @@ Edit the package's CHANGELOG.json file only.
 
 CHANGELOG
 
+## v2.0.0 - _December 2, 2019_
+
+    * Drastically reduced bundle size by adding .npmignore, only exporting specific artifacts/wrappers/utils (#2330)
+    * Add `mintKnownFungibleTokensAsync()`, `isNonFungibleItemAsync()`, `isFungibleItemAsync()`, `getOwnerOfAsync()`, `getBalanceAsync()` to `Erc1155Wrapper`. (#1819)
+    * Replaced `SafeMath` with `LibSafeMath` (#2254)
+
+## v1.2.0-beta.4 - _December 2, 2019_
+
+    * Dependencies updated
+
 ## v1.2.0-beta.3 - _November 20, 2019_
 
     * Dependencies updated

contracts/erc1155/package.json

@@ -1,6 +1,6 @@
 {
     "name": "@0x/contracts-erc1155",
-    "version": "1.2.0-beta.3",
+    "version": "2.0.0",
     "engines": {
         "node": ">=6.12"
     },
@@ -52,14 +52,15 @@
     },
     "homepage": "https://github.com/0xProject/0x-monorepo/contracts/tokens/README.md",
     "devDependencies": {
-        "@0x/abi-gen": "^4.4.0-beta.3",
-        "@0x/contracts-gen": "^1.1.0-beta.3",
-        "@0x/contracts-utils": "^3.3.0-beta.3",
-        "@0x/dev-utils": "^2.4.0-beta.3",
-        "@0x/sol-compiler": "^3.2.0-beta.3",
+        "@0x/abi-gen": "^5.0.0",
+        "@0x/contracts-gen": "^2.0.0",
+        "@0x/contracts-utils": "^4.0.0",
+        "@0x/dev-utils": "^3.0.0",
+        "@0x/sol-compiler": "^4.0.0",
         "@0x/ts-doc-gen": "^0.0.22",
-        "@0x/tslint-config": "^3.1.0-beta.2",
-        "@0x/types": "^2.5.0-beta.2",
+        "@0x/tslint-config": "^4.0.0",
+        "@0x/types": "^3.0.0",
+        "@0x/typescript-typings": "^5.0.0",
         "@types/lodash": "4.14.104",
         "@types/mocha": "^5.2.7",
         "@types/node": "*",
@@ -67,6 +68,7 @@
         "chai-as-promised": "^7.1.0",
         "chai-bignumber": "^3.0.0",
         "dirty-chai": "^2.0.1",
+        "ethereum-types": "^3.0.0",
         "make-promises-safe": "^1.1.0",
         "mocha": "^6.2.0",
         "npm-run-all": "^4.1.2",
@@ -78,12 +80,10 @@
         "typescript": "3.0.1"
     },
     "dependencies": {
-        "@0x/base-contract": "^5.5.0-beta.3",
-        "@0x/contracts-test-utils": "^3.2.0-beta.3",
-        "@0x/typescript-typings": "^4.4.0-beta.2",
-        "@0x/utils": "^4.6.0-beta.2",
-        "@0x/web3-wrapper": "^6.1.0-beta.2",
-        "ethereum-types": "^2.2.0-beta.2",
+        "@0x/base-contract": "^6.0.0",
+        "@0x/contracts-test-utils": "^4.0.0",
+        "@0x/utils": "^5.0.0",
+        "@0x/web3-wrapper": "^7.0.0",
         "lodash": "^4.17.11"
     },
     "publishConfig": {

contracts/erc1155/src/erc1155_wrapper.ts

@@ -1,27 +1,16 @@
-import { LogDecoder } from '@0x/contracts-test-utils';
 import { BigNumber } from '@0x/utils';
-import { Web3Wrapper } from '@0x/web3-wrapper';
-import * as chai from 'chai';
 import { LogWithDecodedArgs, Provider, TransactionReceiptWithDecodedLogs } from 'ethereum-types';
 import * as _ from 'lodash';
 
 import { ERC1155MintableContract, ERC1155TransferSingleEventArgs } from './wrappers';
 
-import { artifacts } from './artifacts';
-
-const expect = chai.expect;
-
 export class Erc1155Wrapper {
     private readonly _erc1155Contract: ERC1155MintableContract;
-    private readonly _web3Wrapper: Web3Wrapper;
     private readonly _contractOwner: string;
-    private readonly _logDecoder: LogDecoder;
 
     constructor(contractInstance: ERC1155MintableContract, provider: Provider, contractOwner: string) {
         this._erc1155Contract = contractInstance;
-        this._web3Wrapper = new Web3Wrapper(provider);
         this._contractOwner = contractOwner;
-        this._logDecoder = new LogDecoder(this._web3Wrapper, artifacts);
     }
     public getContract(): ERC1155MintableContract {
         return this._erc1155Contract;
@@ -40,11 +29,11 @@ export class Erc1155Wrapper {
     ): Promise<TransactionReceiptWithDecodedLogs> {
         const spender = delegatedSpender === undefined ? from : delegatedSpender;
         const callbackDataHex = callbackData === undefined ? '0x' : callbackData;
-        const tx = await this._logDecoder.getTxWithDecodedLogsAsync(
-            await this._erc1155Contract.safeTransferFrom(from, to, token, value, callbackDataHex).sendTransactionAsync({
+        const tx = await this._erc1155Contract
+            .safeTransferFrom(from, to, token, value, callbackDataHex)
+            .awaitTransactionSuccessAsync({
                 from: spender,
-            }),
-        );
+            });
         return tx;
     }
     public async safeBatchTransferFromAsync(
@@ -57,11 +46,9 @@ export class Erc1155Wrapper {
     ): Promise<TransactionReceiptWithDecodedLogs> {
         const spender = delegatedSpender === undefined ? from : delegatedSpender;
         const callbackDataHex = callbackData === undefined ? '0x' : callbackData;
-        const tx = await this._logDecoder.getTxWithDecodedLogsAsync(
-            await this._erc1155Contract
-                .safeBatchTransferFrom(from, to, tokens, values, callbackDataHex)
-                .sendTransactionAsync({ from: spender }),
-        );
+        const tx = await this._erc1155Contract
+            .safeBatchTransferFrom(from, to, tokens, values, callbackDataHex)
+            .awaitTransactionSuccessAsync({ from: spender });
         return tx;
     }
     public async mintFungibleTokensAsync(
@@ -70,11 +57,9 @@ export class Erc1155Wrapper {
     ): Promise<BigNumber> {
         const tokenUri = 'dummyFungibleToken';
         const tokenIsNonFungible = false;
-        const tx = await this._logDecoder.getTxWithDecodedLogsAsync(
-            await this._erc1155Contract.create(tokenUri, tokenIsNonFungible).sendTransactionAsync({
-                from: this._contractOwner,
-            }),
-        );
+        const tx = await this._erc1155Contract.create(tokenUri, tokenIsNonFungible).awaitTransactionSuccessAsync({
+            from: this._contractOwner,
+        });
         // tslint:disable-next-line no-unnecessary-type-assertion
         const createFungibleTokenLog = tx.logs[0] as LogWithDecodedArgs<ERC1155TransferSingleEventArgs>;
         const tokenId = createFungibleTokenLog.args.id;
@@ -99,11 +84,9 @@ export class Erc1155Wrapper {
     public async mintNonFungibleTokensAsync(beneficiaries: string[]): Promise<[BigNumber, BigNumber[]]> {
         const tokenUri = 'dummyNonFungibleToken';
         const tokenIsNonFungible = true;
-        const tx = await this._logDecoder.getTxWithDecodedLogsAsync(
-            await this._erc1155Contract.create(tokenUri, tokenIsNonFungible).sendTransactionAsync({
-                from: this._contractOwner,
-            }),
-        );
+        const tx = await this._erc1155Contract.create(tokenUri, tokenIsNonFungible).awaitTransactionSuccessAsync({
+            from: this._contractOwner,
+        });
         // tslint:disable-next-line no-unnecessary-type-assertion
         const createFungibleTokenLog = tx.logs[0] as LogWithDecodedArgs<ERC1155TransferSingleEventArgs>;
         const token = createFungibleTokenLog.args.id;
@@ -125,11 +108,9 @@ export class Erc1155Wrapper {
         beneficiary: string,
         isApproved: boolean,
     ): Promise<TransactionReceiptWithDecodedLogs> {
-        const tx = await this._logDecoder.getTxWithDecodedLogsAsync(
-            await this._erc1155Contract.setApprovalForAll(beneficiary, isApproved).sendTransactionAsync({
-                from: owner,
-            }),
-        );
+        const tx = await this._erc1155Contract.setApprovalForAll(beneficiary, isApproved).awaitTransactionSuccessAsync({
+            from: owner,
+        });
         return tx;
     }
     public async isApprovedForAllAsync(owner: string, beneficiary: string): Promise<boolean> {
@@ -151,7 +132,9 @@ export class Erc1155Wrapper {
         });
         const balances = await this.getBalancesAsync(ownersExtended, tokensExtended);
         _.each(balances, (balance: BigNumber, i: number) => {
-            expect(balance, `${ownersExtended[i]}${tokensExtended[i]}`).to.be.bignumber.equal(expectedBalances[i]);
+            if (!balance.isEqualTo(expectedBalances[i])) {
+                throw new Error(`${ownersExtended[i]}${tokensExtended[i]} balance not equal ${expectedBalances[i]}`);
+            }
         });
     }
     public async isNonFungibleItemAsync(tokenId: BigNumber): Promise<boolean> {

contracts/erc20-bridge-sampler/.npmignore

@@ -0,0 +1,10 @@
+# Blacklist all files
+.*
+*
+# Whitelist lib
+!lib/**/*
+# Whitelist Solidity contracts
+!contracts/src/**/*
+# Blacklist tests in lib
+/lib/test/*
+# Package specific ignore

contracts/erc20-bridge-sampler/CHANGELOG.json

@@ -0,0 +1,30 @@
+[
+    {
+        "version": "1.0.0",
+        "changes": [
+            {
+                "note": "Created package.",
+                "pr": 2344
+            }
+        ],
+        "timestamp": 1575296764
+    },
+    {
+        "version": "1.0.0-beta.2",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ],
+        "timestamp": 1575290197
+    },
+    {
+        "version": "1.0.0-beta.1",
+        "changes": [
+            {
+                "note": "Created package.",
+                "pr": 2344
+            }
+        ]
+    }
+]

contracts/erc20-bridge-sampler/CHANGELOG.md

@@ -0,0 +1,18 @@
+<!--
+changelogUtils.file is auto-generated using the monorepo-scripts package. Don't edit directly.
+Edit the package's CHANGELOG.json file only.
+-->
+
+CHANGELOG
+
+## v1.0.0 - _December 2, 2019_
+
+    * Created package. (#2344)
+
+## v1.0.0-beta.2 - _December 2, 2019_
+
+    * Dependencies updated
+
+## v1.0.0-beta.1 - _Invalid date_
+
+    * Created package. (#2344)

contracts/erc20-bridge-sampler/DEPLOYS.json

@@ -0,0 +1 @@
+[]

contracts/erc20-bridge-sampler/README.md

@@ -0,0 +1,67 @@
+## ERC20BridgeSampler
+
+This package contains contracts used in DEX aggregation.
+
+This is an MVP implementation, which agnostically samples DEXes for off-chain sorting and order generation. It is entirely read-only and never not touches any funds.
+
+## Installation
+
+**Install**
+
+```bash
+npm install @0x/contracts-erc20-bridge-sampler --save
+```
+
+## Contributing
+
+We strongly recommend that the community help us make improvements and determine the future direction of the protocol. To report bugs within this package, please create an issue in this repository.
+
+For proposals regarding the 0x protocol's smart contract architecture, message format, or additional functionality, go to the [0x Improvement Proposals (ZEIPs)](https://github.com/0xProject/ZEIPs) repository and follow the contribution guidelines provided therein.
+
+Please read our [contribution guidelines](../../CONTRIBUTING.md) before getting started.
+
+### Install Dependencies
+
+If you don't have yarn workspaces enabled (Yarn < v1.0) - enable them:
+
+```bash
+yarn config set workspaces-experimental true
+```
+
+Then install dependencies
+
+```bash
+yarn install
+```
+
+### Build
+
+To build this package and all other monorepo packages that it depends on, run the following from the monorepo root directory:
+
+```bash
+PKG=@0x/contracts-erc20-bridge-sampler yarn build
+```
+
+Or continuously rebuild on change:
+
+```bash
+PKG=@0x/contracts-erc20-bridge-sampler yarn watch
+```
+
+### Clean
+
+```bash
+yarn clean
+```
+
+### Lint
+
+```bash
+yarn lint
+```
+
+### Run Tests
+
+```bash
+yarn test
+```

contracts/erc20-bridge-sampler/compiler.json

@@ -0,0 +1,26 @@
+{
+    "artifactsDir": "./test/generated-artifacts",
+    "contractsDir": "./contracts",
+    "useDockerisedSolc": false,
+    "isOfflineMode": false,
+    "compilerSettings": {
+        "evmVersion": "constantinople",
+        "optimizer": {
+            "enabled": true,
+            "runs": 1000000,
+            "details": { "yul": true, "deduplicate": true, "cse": true, "constantOptimizer": true }
+        },
+        "outputSelection": {
+            "*": {
+                "*": [
+                    "abi",
+                    "devdoc",
+                    "evm.bytecode.object",
+                    "evm.bytecode.sourceMap",
+                    "evm.deployedBytecode.object",
+                    "evm.deployedBytecode.sourceMap"
+                ]
+            }
+        }
+    }
+}

contracts/erc20-bridge-sampler/contracts/src/DeploymentConstants.sol

@@ -0,0 +1,92 @@
+/*
+
+  Copyright 2019 ZeroEx Intl.
+
+  Licensed under the Apache License, Version 2.0 (the "License");
+  you may not use this file except in compliance with the License.
+  You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+  Unless required by applicable law or agreed to in writing, software
+  distributed under the License is distributed on an "AS IS" BASIS,
+  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  See the License for the specific language governing permissions and
+  limitations under the License.
+
+*/
+
+pragma solidity ^0.5.9;
+pragma experimental ABIEncoderV2;
+
+import "@0x/contracts-asset-proxy/contracts/src/interfaces/IUniswapExchangeFactory.sol";
+import "@0x/contracts-exchange/contracts/src/interfaces/IExchange.sol";
+import "./IEth2Dai.sol";
+import "./IKyberNetwork.sol";
+
+
+contract DeploymentConstants {
+
+    /// @dev Address of the 0x Exchange contract.
+    address constant public EXCHANGE_ADDRESS = 0x080bf510FCbF18b91105470639e9561022937712;
+    /// @dev Address of the Eth2Dai MatchingMarket contract.
+    address constant public ETH2DAI_ADDRESS = 0x39755357759cE0d7f32dC8dC45414CCa409AE24e;
+    /// @dev Address of the UniswapExchangeFactory contract.
+    address constant public UNISWAP_EXCHANGE_FACTORY_ADDRESS = 0xc0a47dFe034B400B47bDaD5FecDa2621de6c4d95;
+    /// @dev Address of the KyberNeworkProxy contract.
+    address constant public KYBER_NETWORK_PROXY_ADDRESS = 0x818E6FECD516Ecc3849DAf6845e3EC868087B755;
+    /// @dev Address of the WETH contract.
+    address constant public WETH_ADDRESS = 0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2;
+    /// @dev Kyber ETH pseudo-address.
+    address constant public KYBER_ETH_ADDRESS = 0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE;
+
+    /// @dev An overridable way to retrieve the 0x Exchange contract.
+    /// @return zeroex The 0x Exchange contract.
+    function _getExchangeContract()
+        internal
+        view
+        returns (IExchange zeroex)
+    {
+        return IExchange(EXCHANGE_ADDRESS);
+    }
+
+    /// @dev An overridable way to retrieve the Eth2Dai exchange contract.
+    /// @return eth2dai The Eth2Dai exchange contract.
+    function _getEth2DaiContract()
+        internal
+        view
+        returns (IEth2Dai eth2dai)
+    {
+        return IEth2Dai(ETH2DAI_ADDRESS);
+    }
+
+    /// @dev An overridable way to retrieve the Uniswap exchange factory contract.
+    /// @return uniswap The UniswapExchangeFactory contract.
+    function _getUniswapExchangeFactoryContract()
+        internal
+        view
+        returns (IUniswapExchangeFactory uniswap)
+    {
+        return IUniswapExchangeFactory(UNISWAP_EXCHANGE_FACTORY_ADDRESS);
+    }
+
+    /// @dev An overridable way to retrieve the Kyber network proxy contract.
+    /// @return kyber The KyberNeworkProxy contract.
+    function _getKyberNetworkContract()
+        internal
+        view
+        returns (IKyberNetwork kyber)
+    {
+        return IKyberNetwork(KYBER_NETWORK_PROXY_ADDRESS);
+    }
+
+    /// @dev An overridable way to retrieve the WETH contract address.
+    /// @return weth The WETH contract address.
+    function _getWETHAddress()
+        internal
+        view
+        returns (address weth)
+    {
+        return WETH_ADDRESS;
+    }
+}

contracts/erc20-bridge-sampler/contracts/src/ERC20BridgeSampler.sol

@@ -0,0 +1,451 @@
+/*
+
+  Copyright 2019 ZeroEx Intl.
+
+  Licensed under the Apache License, Version 2.0 (the "License");
+  you may not use this file except in compliance with the License.
+  You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+  Unless required by applicable law or agreed to in writing, software
+  distributed under the License is distributed on an "AS IS" BASIS,
+  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  See the License for the specific language governing permissions and
+  limitations under the License.
+
+*/
+
+pragma solidity ^0.5.9;
+pragma experimental ABIEncoderV2;
+
+import "@0x/contracts-asset-proxy/contracts/src/interfaces/IUniswapExchangeFactory.sol";
+import "@0x/contracts-erc20/contracts/src/LibERC20Token.sol";
+import "@0x/contracts-exchange/contracts/src/interfaces/IExchange.sol";
+import "@0x/contracts-exchange-libs/contracts/src/LibOrder.sol";
+import "./IERC20BridgeSampler.sol";
+import "./IEth2Dai.sol";
+import "./IKyberNetwork.sol";
+import "./IUniswapExchangeQuotes.sol";
+import "./DeploymentConstants.sol";
+
+
+contract ERC20BridgeSampler is
+    IERC20BridgeSampler,
+    DeploymentConstants
+{
+    bytes4 constant internal ERC20_PROXY_ID = 0xf47261b0; // bytes4(keccak256("ERC20Token(address)"));
+
+    /// @dev Query native orders and sample sell quotes on multiple DEXes at once.
+    /// @param orders Native orders to query.
+    /// @param sources Address of each DEX. Passing in an unsupported DEX will throw.
+    /// @param takerTokenAmounts Taker token sell amount for each sample.
+    /// @return orderInfos `OrderInfo`s for each order in `orders`.
+    /// @return makerTokenAmountsBySource Maker amounts bought for each source at
+    ///         each taker token amount. First indexed by source index, then sample
+    ///         index.
+    function queryOrdersAndSampleSells(
+        LibOrder.Order[] memory orders,
+        address[] memory sources,
+        uint256[] memory takerTokenAmounts
+    )
+        public
+        view
+        returns (
+            LibOrder.OrderInfo[] memory orderInfos,
+            uint256[][] memory makerTokenAmountsBySource
+        )
+    {
+        require(orders.length != 0, "EMPTY_ORDERS");
+        orderInfos = queryOrders(orders);
+        makerTokenAmountsBySource = sampleSells(
+            sources,
+            _assetDataToTokenAddress(orders[0].takerAssetData),
+            _assetDataToTokenAddress(orders[0].makerAssetData),
+            takerTokenAmounts
+        );
+    }
+
+    /// @dev Query native orders and sample buy quotes on multiple DEXes at once.
+    /// @param orders Native orders to query.
+    /// @param sources Address of each DEX. Passing in an unsupported DEX will throw.
+    /// @param makerTokenAmounts Maker token buy amount for each sample.
+    /// @return orderInfos `OrderInfo`s for each order in `orders`.
+    /// @return takerTokenAmountsBySource Taker amounts sold for each source at
+    ///         each maker token amount. First indexed by source index, then sample
+    ///         index.
+    function queryOrdersAndSampleBuys(
+        LibOrder.Order[] memory orders,
+        address[] memory sources,
+        uint256[] memory makerTokenAmounts
+    )
+        public
+        view
+        returns (
+            LibOrder.OrderInfo[] memory orderInfos,
+            uint256[][] memory makerTokenAmountsBySource
+        )
+    {
+        require(orders.length != 0, "EMPTY_ORDERS");
+        orderInfos = queryOrders(orders);
+        makerTokenAmountsBySource = sampleBuys(
+            sources,
+            _assetDataToTokenAddress(orders[0].takerAssetData),
+            _assetDataToTokenAddress(orders[0].makerAssetData),
+            makerTokenAmounts
+        );
+    }
+
+    /// @dev Queries the status of several native orders.
+    /// @param orders Native orders to query.
+    /// @return orderInfos Order info for each respective order.
+    function queryOrders(LibOrder.Order[] memory orders)
+        public
+        view
+        returns (LibOrder.OrderInfo[] memory orderInfos)
+    {
+        uint256 numOrders = orders.length;
+        orderInfos = new LibOrder.OrderInfo[](numOrders);
+        for (uint256 i = 0; i < numOrders; i++) {
+            orderInfos[i] = _getExchangeContract().getOrderInfo(orders[i]);
+        }
+    }
+
+    /// @dev Sample sell quotes on multiple DEXes at once.
+    /// @param sources Address of each DEX. Passing in an unsupported DEX will throw.
+    /// @param takerToken Address of the taker token (what to sell).
+    /// @param makerToken Address of the maker token (what to buy).
+    /// @param takerTokenAmounts Taker token sell amount for each sample.
+    /// @return makerTokenAmountsBySource Maker amounts bought for each source at
+    ///         each taker token amount. First indexed by source index, then sample
+    ///         index.
+    function sampleSells(
+        address[] memory sources,
+        address takerToken,
+        address makerToken,
+        uint256[] memory takerTokenAmounts
+    )
+        public
+        view
+        returns (uint256[][] memory makerTokenAmountsBySource)
+    {
+        uint256 numSources = sources.length;
+        makerTokenAmountsBySource = new uint256[][](numSources);
+        for (uint256 i = 0; i < numSources; i++) {
+            makerTokenAmountsBySource[i] = _sampleSellSource(
+                sources[i],
+                takerToken,
+                makerToken,
+                takerTokenAmounts
+            );
+        }
+    }
+
+    /// @dev Query native orders and sample buy quotes on multiple DEXes at once.
+    /// @param sources Address of each DEX. Passing in an unsupported DEX will throw.
+    /// @param takerToken Address of the taker token (what to sell).
+    /// @param makerToken Address of the maker token (what to buy).
+    /// @param makerTokenAmounts Maker token buy amount for each sample.
+    /// @return takerTokenAmountsBySource Taker amounts sold for each source at
+    ///         each maker token amount. First indexed by source index, then sample
+    ///         index.
+    function sampleBuys(
+        address[] memory sources,
+        address takerToken,
+        address makerToken,
+        uint256[] memory makerTokenAmounts
+    )
+        public
+        view
+        returns (uint256[][] memory takerTokenAmountsBySource)
+    {
+        uint256 numSources = sources.length;
+        takerTokenAmountsBySource = new uint256[][](numSources);
+        for (uint256 i = 0; i < numSources; i++) {
+            takerTokenAmountsBySource[i] = _sampleBuySource(
+                sources[i],
+                takerToken,
+                makerToken,
+                makerTokenAmounts
+            );
+        }
+    }
+
+    /// @dev Sample sell quotes from Kyber.
+    /// @param takerToken Address of the taker token (what to sell).
+    /// @param makerToken Address of the maker token (what to buy).
+    /// @param takerTokenAmounts Taker token sell amount for each sample.
+    /// @return makerTokenAmounts Maker amounts bought at each taker token
+    ///         amount.
+    function sampleSellsFromKyberNetwork(
+        address takerToken,
+        address makerToken,
+        uint256[] memory takerTokenAmounts
+    )
+        public
+        view
+        returns (uint256[] memory makerTokenAmounts)
+    {
+        _assertValidPair(makerToken, takerToken);
+        address _takerToken = takerToken == _getWETHAddress() ? KYBER_ETH_ADDRESS : takerToken;
+        address _makerToken = makerToken == _getWETHAddress() ? KYBER_ETH_ADDRESS : makerToken;
+        uint256 takerTokenDecimals = _getTokenDecimals(takerToken);
+        uint256 makerTokenDecimals = _getTokenDecimals(makerToken);
+        uint256 numSamples = takerTokenAmounts.length;
+        makerTokenAmounts = new uint256[](numSamples);
+        for (uint256 i = 0; i < numSamples; i++) {
+            (uint256 rate,) = _getKyberNetworkContract().getExpectedRate(
+                _takerToken,
+                _makerToken,
+                takerTokenAmounts[i]
+            );
+            makerTokenAmounts[i] =
+                rate *
+                takerTokenAmounts[i] *
+                10 ** makerTokenDecimals /
+                10 ** takerTokenDecimals /
+                10 ** 18;
+        }
+    }
+
+    /// @dev Sample sell quotes from Eth2Dai/Oasis.
+    /// @param takerToken Address of the taker token (what to sell).
+    /// @param makerToken Address of the maker token (what to buy).
+    /// @param takerTokenAmounts Taker token sell amount for each sample.
+    /// @return makerTokenAmounts Maker amounts bought at each taker token
+    ///         amount.
+    function sampleSellsFromEth2Dai(
+        address takerToken,
+        address makerToken,
+        uint256[] memory takerTokenAmounts
+    )
+        public
+        view
+        returns (uint256[] memory makerTokenAmounts)
+    {
+        _assertValidPair(makerToken, takerToken);
+        uint256 numSamples = takerTokenAmounts.length;
+        makerTokenAmounts = new uint256[](numSamples);
+        for (uint256 i = 0; i < numSamples; i++) {
+            makerTokenAmounts[i] = _getEth2DaiContract().getBuyAmount(
+                makerToken,
+                takerToken,
+                takerTokenAmounts[i]
+            );
+        }
+    }
+
+    /// @dev Sample buy quotes from Eth2Dai/Oasis.
+    /// @param takerToken Address of the taker token (what to sell).
+    /// @param makerToken Address of the maker token (what to buy).
+    /// @param takerTokenAmounts Maker token sell amount for each sample.
+    /// @return takerTokenAmounts Taker amounts sold at each maker token
+    ///         amount.
+    function sampleBuysFromEth2Dai(
+        address takerToken,
+        address makerToken,
+        uint256[] memory makerTokenAmounts
+    )
+        public
+        view
+        returns (uint256[] memory takerTokenAmounts)
+    {
+        _assertValidPair(makerToken, takerToken);
+        uint256 numSamples = makerTokenAmounts.length;
+        takerTokenAmounts = new uint256[](numSamples);
+        for (uint256 i = 0; i < numSamples; i++) {
+            takerTokenAmounts[i] = _getEth2DaiContract().getPayAmount(
+                takerToken,
+                makerToken,
+                makerTokenAmounts[i]
+            );
+        }
+    }
+
+    /// @dev Sample sell quotes from Uniswap.
+    /// @param takerToken Address of the taker token (what to sell).
+    /// @param makerToken Address of the maker token (what to buy).
+    /// @param takerTokenAmounts Taker token sell amount for each sample.
+    /// @return makerTokenAmounts Maker amounts bought at each taker token
+    ///         amount.
+    function sampleSellsFromUniswap(
+        address takerToken,
+        address makerToken,
+        uint256[] memory takerTokenAmounts
+    )
+        public
+        view
+        returns (uint256[] memory makerTokenAmounts)
+    {
+        _assertValidPair(makerToken, takerToken);
+        uint256 numSamples = takerTokenAmounts.length;
+        makerTokenAmounts = new uint256[](numSamples);
+        IUniswapExchangeQuotes takerTokenExchange = takerToken == _getWETHAddress() ?
+            IUniswapExchangeQuotes(0) : _getUniswapExchange(takerToken);
+        IUniswapExchangeQuotes makerTokenExchange = makerToken == _getWETHAddress() ?
+            IUniswapExchangeQuotes(0) : _getUniswapExchange(makerToken);
+        for (uint256 i = 0; i < numSamples; i++) {
+            if (makerToken == _getWETHAddress()) {
+                makerTokenAmounts[i] = takerTokenExchange.getTokenToEthInputPrice(
+                    takerTokenAmounts[i]
+                );
+            } else if (takerToken == _getWETHAddress()) {
+                makerTokenAmounts[i] = makerTokenExchange.getEthToTokenInputPrice(
+                    takerTokenAmounts[i]
+                );
+            } else {
+                uint256 ethBought = takerTokenExchange.getTokenToEthInputPrice(
+                    takerTokenAmounts[i]
+                );
+                makerTokenAmounts[i] = makerTokenExchange.getEthToTokenInputPrice(
+                    ethBought
+                );
+            }
+        }
+    }
+
+    /// @dev Sample buy quotes from Uniswap.
+    /// @param takerToken Address of the taker token (what to sell).
+    /// @param makerToken Address of the maker token (what to buy).
+    /// @param makerTokenAmounts Maker token sell amount for each sample.
+    /// @return takerTokenAmounts Taker amounts sold at each maker token
+    ///         amount.
+    function sampleBuysFromUniswap(
+        address takerToken,
+        address makerToken,
+        uint256[] memory makerTokenAmounts
+    )
+        public
+        view
+        returns (uint256[] memory takerTokenAmounts)
+    {
+        _assertValidPair(makerToken, takerToken);
+        uint256 numSamples = makerTokenAmounts.length;
+        takerTokenAmounts = new uint256[](numSamples);
+        IUniswapExchangeQuotes takerTokenExchange = takerToken == _getWETHAddress() ?
+            IUniswapExchangeQuotes(0) : _getUniswapExchange(takerToken);
+        IUniswapExchangeQuotes makerTokenExchange = makerToken == _getWETHAddress() ?
+            IUniswapExchangeQuotes(0) : _getUniswapExchange(makerToken);
+        for (uint256 i = 0; i < numSamples; i++) {
+            if (makerToken == _getWETHAddress()) {
+                takerTokenAmounts[i] = takerTokenExchange.getTokenToEthOutputPrice(
+                    makerTokenAmounts[i]
+                );
+            } else if (takerToken == _getWETHAddress()) {
+                takerTokenAmounts[i] = makerTokenExchange.getEthToTokenOutputPrice(
+                    makerTokenAmounts[i]
+                );
+            } else {
+                uint256 ethSold = makerTokenExchange.getEthToTokenOutputPrice(
+                    makerTokenAmounts[i]
+                );
+                takerTokenAmounts[i] = takerTokenExchange.getTokenToEthOutputPrice(
+                    ethSold
+                );
+            }
+        }
+    }
+
+    /// @dev Overridable way to get token decimals.
+    /// @param tokenAddress Address of the token.
+    /// @return decimals The decimal places for the token.
+    function _getTokenDecimals(address tokenAddress)
+        internal
+        view
+        returns (uint8 decimals)
+    {
+        return LibERC20Token.decimals(tokenAddress);
+    }
+
+    /// @dev Samples a supported sell source, defined by its address.
+    /// @param takerToken Address of the taker token (what to sell).
+    /// @param makerToken Address of the maker token (what to buy).
+    /// @param takerTokenAmounts Taker token sell amount for each sample.
+    /// @return makerTokenAmounts Maker amounts bought at each taker token
+    ///         amount.
+    function _sampleSellSource(
+        address source,
+        address takerToken,
+        address makerToken,
+        uint256[] memory takerTokenAmounts
+    )
+        private
+        view
+        returns (uint256[] memory makerTokenAmounts)
+    {
+        if (source == address(_getEth2DaiContract())) {
+            return sampleSellsFromEth2Dai(takerToken, makerToken, takerTokenAmounts);
+        }
+        if (source == address(_getUniswapExchangeFactoryContract())) {
+            return sampleSellsFromUniswap(takerToken, makerToken, takerTokenAmounts);
+        }
+        if (source == address(_getKyberNetworkContract())) {
+            return sampleSellsFromKyberNetwork(takerToken, makerToken, takerTokenAmounts);
+        }
+        revert("UNSUPPORTED_SOURCE");
+    }
+
+    /// @dev Samples a supported buy source, defined by its address.
+    /// @param takerToken Address of the taker token (what to sell).
+    /// @param makerToken Address of the maker token (what to buy).
+    /// @param makerTokenAmounts Maker token sell amount for each sample.
+    /// @return takerTokenAmounts Taker amounts sold at each maker token
+    ///         amount.
+    function _sampleBuySource(
+        address source,
+        address takerToken,
+        address makerToken,
+        uint256[] memory makerTokenAmounts
+    )
+        private
+        view
+        returns (uint256[] memory takerTokenAmounts)
+    {
+        if (source == address(_getEth2DaiContract())) {
+            return sampleBuysFromEth2Dai(takerToken, makerToken, makerTokenAmounts);
+        }
+        if (source == address(_getUniswapExchangeFactoryContract())) {
+            return sampleBuysFromUniswap(takerToken, makerToken, makerTokenAmounts);
+        }
+        revert("UNSUPPORTED_SOURCE");
+    }
+
+    /// @dev Retrive an existing Uniswap exchange contract.
+    ///      Throws if the exchange does not exist.
+    /// @param tokenAddress Address of the token contract.
+    /// @return exchange `IUniswapExchangeQuotes` for the token.
+    function _getUniswapExchange(address tokenAddress)
+        private
+        view
+        returns (IUniswapExchangeQuotes exchange)
+    {
+        exchange = IUniswapExchangeQuotes(
+            address(_getUniswapExchangeFactoryContract().getExchange(tokenAddress))
+        );
+        require(address(exchange) != address(0), "UNSUPPORTED_UNISWAP_EXCHANGE");
+    }
+
+    /// @dev Extract the token address from ERC20 proxy asset data.
+    /// @param assetData ERC20 asset data.
+    /// @return tokenAddress The decoded token address.
+    function _assetDataToTokenAddress(bytes memory assetData)
+        private
+        pure
+        returns (address tokenAddress)
+    {
+        require(assetData.length == 36, "INVALID_ASSET_DATA");
+        bytes4 selector;
+        assembly {
+            selector := and(mload(add(assetData, 0x20)), 0xFFFFFFFF00000000000000000000000000000000000000000000000000000000)
+            tokenAddress := mload(add(assetData, 0x24))
+        }
+        require(selector == ERC20_PROXY_ID, "UNSUPPORTED_ASSET_PROXY");
+    }
+
+    function _assertValidPair(address makerToken, address takerToken)
+        private
+        pure
+    {
+        require(makerToken != takerToken, "INVALID_TOKEN_PAIR");
+    }
+}

contracts/erc20-bridge-sampler/contracts/src/IERC20BridgeSampler.sol

@@ -0,0 +1,111 @@
+/*
+
+  Copyright 2019 ZeroEx Intl.
+
+  Licensed under the Apache License, Version 2.0 (the "License");
+  you may not use this file except in compliance with the License.
+  You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+  Unless required by applicable law or agreed to in writing, software
+  distributed under the License is distributed on an "AS IS" BASIS,
+  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  See the License for the specific language governing permissions and
+  limitations under the License.
+
+*/
+
+pragma solidity ^0.5.9;
+pragma experimental ABIEncoderV2;
+
+import "@0x/contracts-exchange/contracts/src/interfaces/IExchange.sol";
+import "@0x/contracts-exchange-libs/contracts/src/LibOrder.sol";
+
+
+interface IERC20BridgeSampler {
+
+    /// @dev Query native orders and sample sell orders on multiple DEXes at once.
+    /// @param orders Native orders to query.
+    /// @param sources Address of each DEX. Passing in an unknown DEX will throw.
+    /// @param takerTokenAmounts Taker sell amount for each sample.
+    /// @return orderInfos `OrderInfo`s for each order in `orders`.
+    /// @return makerTokenAmountsBySource Maker amounts bought for each source at
+    ///         each taker token amount. First indexed by source index, then sample
+    ///         index.
+    function queryOrdersAndSampleSells(
+        LibOrder.Order[] calldata orders,
+        address[] calldata sources,
+        uint256[] calldata takerTokenAmounts
+    )
+        external
+        view
+        returns (
+            LibOrder.OrderInfo[] memory orderInfos,
+            uint256[][] memory makerTokenAmountsBySource
+        );
+
+    /// @dev Query native orders and sample buy orders on multiple DEXes at once.
+    /// @param orders Native orders to query.
+    /// @param sources Address of each DEX. Passing in an unknown DEX will throw.
+    /// @param makerTokenAmounts Maker sell amount for each sample.
+    /// @return orderInfos `OrderInfo`s for each order in `orders`.
+    /// @return takerTokenAmountsBySource Taker amounts sold for each source at
+    ///         each maker token amount. First indexed by source index, then sample
+    ///         index.
+    function queryOrdersAndSampleBuys(
+        LibOrder.Order[] calldata orders,
+        address[] calldata sources,
+        uint256[] calldata makerTokenAmounts
+    )
+        external
+        view
+        returns (
+            LibOrder.OrderInfo[] memory orderInfos,
+            uint256[][] memory makerTokenAmountsBySource
+        );
+
+    /// @dev Queries the status of several native orders.
+    /// @param orders Native orders to query.
+    /// @return orderInfos Order info for each respective order.
+    function queryOrders(LibOrder.Order[] calldata orders)
+        external
+        view
+        returns (LibOrder.OrderInfo[] memory orderInfos);
+
+    /// @dev Sample sell quotes on multiple DEXes at once.
+    /// @param sources Address of each DEX. Passing in an unsupported DEX will throw.
+    /// @param takerToken Address of the taker token (what to sell).
+    /// @param makerToken Address of the maker token (what to buy).
+    /// @param takerTokenAmounts Taker token sell amount for each sample.
+    /// @return makerTokenAmountsBySource Maker amounts bought for each source at
+    ///         each taker token amount. First indexed by source index, then sample
+    ///         index.
+    function sampleSells(
+        address[] calldata sources,
+        address takerToken,
+        address makerToken,
+        uint256[] calldata takerTokenAmounts
+    )
+        external
+        view
+        returns (uint256[][] memory makerTokenAmountsBySource);
+
+    /// @dev Query native orders and sample buy quotes on multiple DEXes at once.
+    /// @param sources Address of each DEX. Passing in an unsupported DEX will throw.
+    /// @param takerToken Address of the taker token (what to sell).
+    /// @param makerToken Address of the maker token (what to buy).
+    /// @param makerTokenAmounts Maker token buy amount for each sample.
+    /// @return takerTokenAmountsBySource Taker amounts sold for each source at
+    ///         each maker token amount. First indexed by source index, then sample
+    ///         index.
+    function sampleBuys(
+        address[] calldata sources,
+        address takerToken,
+        address makerToken,
+        uint256[] calldata makerTokenAmounts
+    )
+        external
+        view
+        returns (uint256[][] memory takerTokenAmountsBySource);
+}

contracts/erc20-bridge-sampler/contracts/src/IEth2Dai.sol

@@ -0,0 +1,41 @@
+/*
+
+  Copyright 2019 ZeroEx Intl.
+
+  Licensed under the Apache License, Version 2.0 (the "License");
+  you may not use this file except in compliance with the License.
+  You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+  Unless required by applicable law or agreed to in writing, software
+  distributed under the License is distributed on an "AS IS" BASIS,
+  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  See the License for the specific language governing permissions and
+  limitations under the License.
+
+*/
+
+pragma solidity ^0.5.9;
+
+
+interface IEth2Dai {
+
+    function getBuyAmount(
+        address buyToken,
+        address payToken,
+        uint256 payAmount
+    )
+        external
+        view
+        returns (uint256 buyAmount);
+
+    function getPayAmount(
+        address payToken,
+        address buyToken,
+        uint256 buyAmount
+    )
+        external
+        view
+        returns (uint256 payAmount);
+}

contracts/erc20-bridge-sampler/contracts/src/IKyberNetwork.sol

@@ -0,0 +1,32 @@
+/*
+
+  Copyright 2019 ZeroEx Intl.
+
+  Licensed under the Apache License, Version 2.0 (the "License");
+  you may not use this file except in compliance with the License.
+  You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+  Unless required by applicable law or agreed to in writing, software
+  distributed under the License is distributed on an "AS IS" BASIS,
+  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  See the License for the specific language governing permissions and
+  limitations under the License.
+
+*/
+
+pragma solidity ^0.5.9;
+
+
+interface IKyberNetwork {
+
+    function getExpectedRate(
+        address fromToken,
+        address toToken,
+        uint256 fromAmount
+    )
+        external
+        view
+        returns (uint256 expectedRate, uint256 slippageRate);
+}

contracts/erc20-bridge-sampler/contracts/src/IUniswapExchangeQuotes.sol

@@ -0,0 +1,51 @@
+/*
+
+  Copyright 2019 ZeroEx Intl.
+
+  Licensed under the Apache License, Version 2.0 (the "License");
+  you may not use this file except in compliance with the License.
+  You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+  Unless required by applicable law or agreed to in writing, software
+  distributed under the License is distributed on an "AS IS" BASIS,
+  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  See the License for the specific language governing permissions and
+  limitations under the License.
+
+*/
+
+pragma solidity ^0.5.9;
+
+
+interface IUniswapExchangeQuotes {
+
+    function getEthToTokenInputPrice(
+        uint256 ethSold
+    )
+        external
+        view
+        returns (uint256 tokensBought);
+
+    function getEthToTokenOutputPrice(
+        uint256 tokensBought
+    )
+        external
+        view
+        returns (uint256 ethSold);
+
+    function getTokenToEthInputPrice(
+        uint256 tokensSold
+    )
+        external
+        view
+        returns (uint256 ethBought);
+
+    function getTokenToEthOutputPrice(
+        uint256 ethBought
+    )
+        external
+        view
+        returns (uint256 tokensSold);
+}

contracts/erc20-bridge-sampler/contracts/test/TestERC20BridgeSampler.sol

@@ -0,0 +1,349 @@
+/*
+
+  Copyright 2019 ZeroEx Intl.
+
+  Licensed under the Apache License, Version 2.0 (the "License");
+  you may not use this file except in compliance with the License.
+  You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+  Unless required by applicable law or agreed to in writing, software
+  distributed under the License is distributed on an "AS IS" BASIS,
+  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  See the License for the specific language governing permissions and
+  limitations under the License.
+
+*/
+pragma solidity ^0.5.9;
+pragma experimental ABIEncoderV2;
+
+import "@0x/contracts-asset-proxy/contracts/src/interfaces/IUniswapExchangeFactory.sol";
+import "@0x/contracts-exchange/contracts/src/interfaces/IExchange.sol";
+import "@0x/contracts-exchange-libs/contracts/src/LibOrder.sol";
+import "../src/ERC20BridgeSampler.sol";
+import "../src/IEth2Dai.sol";
+import "../src/IKyberNetwork.sol";
+
+
+library LibDeterministicQuotes {
+
+    address private constant WETH_ADDRESS = 0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2;
+    uint256 private constant RATE_DENOMINATOR = 1 ether;
+    uint256 private constant MIN_RATE = RATE_DENOMINATOR / 100;
+    uint256 private constant MAX_RATE = 100 * RATE_DENOMINATOR;
+    uint8 private constant MIN_DECIMALS = 4;
+    uint8 private constant MAX_DECIMALS = 20;
+
+    function getDeterministicSellQuote(
+        bytes32 salt,
+        address sellToken,
+        address buyToken,
+        uint256 sellAmount
+    )
+        internal
+        pure
+        returns (uint256 buyAmount)
+    {
+        uint256 sellBase = uint256(10) ** getDeterministicTokenDecimals(sellToken);
+        uint256 buyBase = uint256(10) ** getDeterministicTokenDecimals(buyToken);
+        uint256 rate = getDeterministicRate(salt, sellToken, buyToken);
+        return sellAmount * rate * buyBase / sellBase / RATE_DENOMINATOR;
+    }
+
+    function getDeterministicBuyQuote(
+        bytes32 salt,
+        address sellToken,
+        address buyToken,
+        uint256 buyAmount
+    )
+        internal
+        pure
+        returns (uint256 sellAmount)
+    {
+        uint256 sellBase = uint256(10) ** getDeterministicTokenDecimals(sellToken);
+        uint256 buyBase = uint256(10) ** getDeterministicTokenDecimals(buyToken);
+        uint256 rate = getDeterministicRate(salt, sellToken, buyToken);
+        return buyAmount * RATE_DENOMINATOR * sellBase / rate / buyBase;
+    }
+
+    function getDeterministicTokenDecimals(address token)
+        internal
+        pure
+        returns (uint8 decimals)
+    {
+        if (token == WETH_ADDRESS) {
+            return 18;
+        }
+        bytes32 seed = keccak256(abi.encodePacked(token));
+        return uint8(uint256(seed) % (MAX_DECIMALS - MIN_DECIMALS)) + MIN_DECIMALS;
+    }
+
+    function getDeterministicRate(bytes32 salt, address sellToken, address buyToken)
+        internal
+        pure
+        returns (uint256 rate)
+    {
+        bytes32 seed = keccak256(abi.encodePacked(salt, sellToken, buyToken));
+        return uint256(seed) % (MAX_RATE - MIN_RATE) + MIN_RATE;
+    }
+}
+
+
+contract TestERC20BridgeSamplerUniswapExchange is
+    IUniswapExchangeQuotes,
+    DeploymentConstants
+{
+    bytes32 constant private BASE_SALT = 0x1d6a6a0506b0b4a554b907a4c29d9f4674e461989d9c1921feb17b26716385ab;
+
+    address public tokenAddress;
+    bytes32 public salt;
+
+    constructor(address _tokenAddress) public {
+        tokenAddress = _tokenAddress;
+        salt = keccak256(abi.encodePacked(BASE_SALT, _tokenAddress));
+    }
+
+    // Deterministic `IUniswapExchangeQuotes.getEthToTokenInputPrice()`.
+    function getEthToTokenInputPrice(
+        uint256 ethSold
+    )
+        external
+        view
+        returns (uint256 tokensBought)
+    {
+        return LibDeterministicQuotes.getDeterministicSellQuote(
+            salt,
+            tokenAddress,
+            WETH_ADDRESS,
+            ethSold
+        );
+    }
+
+    // Deterministic `IUniswapExchangeQuotes.getEthToTokenOutputPrice()`.
+    function getEthToTokenOutputPrice(
+        uint256 tokensBought
+    )
+        external
+        view
+        returns (uint256 ethSold)
+    {
+        return LibDeterministicQuotes.getDeterministicBuyQuote(
+            salt,
+            WETH_ADDRESS,
+            tokenAddress,
+            tokensBought
+        );
+    }
+
+    // Deterministic `IUniswapExchangeQuotes.getTokenToEthInputPrice()`.
+    function getTokenToEthInputPrice(
+        uint256 tokensSold
+    )
+        external
+        view
+        returns (uint256 ethBought)
+    {
+        return LibDeterministicQuotes.getDeterministicSellQuote(
+            salt,
+            tokenAddress,
+            WETH_ADDRESS,
+            tokensSold
+        );
+    }
+
+    // Deterministic `IUniswapExchangeQuotes.getTokenToEthOutputPrice()`.
+    function getTokenToEthOutputPrice(
+        uint256 ethBought
+    )
+        external
+        view
+        returns (uint256 tokensSold)
+    {
+        return LibDeterministicQuotes.getDeterministicBuyQuote(
+            salt,
+            WETH_ADDRESS,
+            tokenAddress,
+            ethBought
+        );
+    }
+}
+
+
+contract TestERC20BridgeSamplerKyberNetwork is
+    IKyberNetwork,
+    DeploymentConstants
+{
+    bytes32 constant private SALT = 0x0ff3ca9d46195c39f9a12afb74207b4970349fb3cfb1e459bbf170298d326bc7;
+    address constant public ETH_ADDRESS = 0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE;
+
+    // Deterministic `IKyberNetwork.getExpectedRate()`.
+    function getExpectedRate(
+        address fromToken,
+        address toToken,
+        uint256
+    )
+        external
+        view
+        returns (uint256 expectedRate, uint256)
+    {
+        fromToken = fromToken == ETH_ADDRESS ? WETH_ADDRESS : fromToken;
+        toToken = toToken == ETH_ADDRESS ? WETH_ADDRESS : toToken;
+        expectedRate = LibDeterministicQuotes.getDeterministicRate(
+            SALT,
+            fromToken,
+            toToken
+        );
+    }
+}
+
+
+contract TestERC20BridgeSamplerEth2Dai is
+    IEth2Dai
+{
+    bytes32 constant private SALT = 0xb713b61bb9bb2958a0f5d1534b21e94fc68c4c0c034b0902ed844f2f6cd1b4f7;
+
+    // Deterministic `IEth2Dai.getBuyAmount()`.
+    function getBuyAmount(
+        address buyToken,
+        address payToken,
+        uint256 payAmount
+    )
+        external
+        view
+        returns (uint256 buyAmount)
+    {
+        return LibDeterministicQuotes.getDeterministicSellQuote(
+            SALT,
+            payToken,
+            buyToken,
+            payAmount
+        );
+    }
+
+    // Deterministic `IEth2Dai.getPayAmount()`.
+    function getPayAmount(
+        address payToken,
+        address buyToken,
+        uint256 buyAmount
+    )
+        external
+        view
+        returns (uint256 payAmount)
+    {
+        return LibDeterministicQuotes.getDeterministicBuyQuote(
+            SALT,
+            payToken,
+            buyToken,
+            buyAmount
+        );
+    }
+}
+
+
+contract TestERC20BridgeSamplerUniswapExchangeFactory is
+    IUniswapExchangeFactory
+{
+    mapping (address => IUniswapExchangeQuotes) private _exchangesByToken;
+
+    // Creates Uniswap exchange contracts for tokens.
+    function createTokenExchanges(address[] calldata tokenAddresses)
+        external
+    {
+        for (uint256 i = 0; i < tokenAddresses.length; i++) {
+            address tokenAddress = tokenAddresses[i];
+            _exchangesByToken[tokenAddress] =
+                new TestERC20BridgeSamplerUniswapExchange(tokenAddress);
+        }
+    }
+
+    // `IUniswapExchangeFactory.getExchange()`.
+    function getExchange(address tokenAddress)
+        external
+        view
+        returns (address)
+    {
+        return address(_exchangesByToken[tokenAddress]);
+    }
+}
+
+
+contract TestERC20BridgeSampler is
+    ERC20BridgeSampler
+{
+    TestERC20BridgeSamplerUniswapExchangeFactory public uniswap;
+    TestERC20BridgeSamplerEth2Dai public eth2Dai;
+    TestERC20BridgeSamplerKyberNetwork public kyber;
+
+    constructor() public {
+        uniswap = new TestERC20BridgeSamplerUniswapExchangeFactory();
+        eth2Dai = new TestERC20BridgeSamplerEth2Dai();
+        kyber = new TestERC20BridgeSamplerKyberNetwork();
+    }
+
+    // Creates Uniswap exchange contracts for tokens.
+    function createTokenExchanges(address[] calldata tokenAddresses)
+        external
+    {
+        uniswap.createTokenExchanges(tokenAddresses);
+    }
+
+    // `IExchange.getOrderInfo()`, overridden to return deterministic order infos.
+    function getOrderInfo(LibOrder.Order memory order)
+        public
+        pure
+        returns (LibOrder.OrderInfo memory orderInfo)
+    {
+        // The order hash is just the hash of the salt.
+        bytes32 orderHash = keccak256(abi.encode(order.salt));
+        // Everything else is derived from the hash.
+        orderInfo.orderHash = orderHash;
+        orderInfo.orderStatus = uint8(uint256(orderHash) % uint8(-1));
+        orderInfo.orderTakerAssetFilledAmount = uint256(orderHash) % order.takerAssetAmount;
+    }
+
+    // Overriden to return deterministic decimals.
+    function _getTokenDecimals(address tokenAddress)
+        internal
+        view
+        returns (uint8 decimals)
+    {
+        return LibDeterministicQuotes.getDeterministicTokenDecimals(tokenAddress);
+    }
+
+    // Overriden to point to a this contract.
+    function _getExchangeContract()
+        internal
+        view
+        returns (IExchange zeroex)
+    {
+        return IExchange(address(this));
+    }
+
+    // Overriden to point to a custom contract.
+    function _getEth2DaiContract()
+        internal
+        view
+        returns (IEth2Dai eth2dai_)
+    {
+        return eth2Dai;
+    }
+
+    // Overriden to point to a custom contract.
+    function _getUniswapExchangeFactoryContract()
+        internal
+        view
+        returns (IUniswapExchangeFactory uniswap_)
+    {
+        return uniswap;
+    }
+
+    // Overriden to point to a custom contract.
+    function _getKyberNetworkContract()
+        internal
+        view
+        returns (IKyberNetwork kyber_)
+    {
+        return kyber;
+    }
+}

contracts/erc20-bridge-sampler/package.json

@@ -0,0 +1,92 @@
+{
+    "name": "@0x/contracts-erc20-bridge-sampler",
+    "version": "1.0.0",
+    "engines": {
+        "node": ">=6.12"
+    },
+    "description": "Sampler contracts for the 0x asset-swapper",
+    "main": "lib/src/index.js",
+    "directories": {
+        "test": "test"
+    },
+    "scripts": {
+        "build": "yarn pre_build && tsc -b",
+        "build:ci": "yarn build",
+        "pre_build": "run-s compile contracts:gen generate_contract_wrappers contracts:copy",
+        "test": "yarn run_mocha",
+        "rebuild_and_test": "run-s build test",
+        "test:coverage": "SOLIDITY_COVERAGE=true run-s build run_mocha coverage:report:text coverage:report:lcov",
+        "test:profiler": "SOLIDITY_PROFILER=true run-s build run_mocha profiler:report:html",
+        "test:trace": "SOLIDITY_REVERT_TRACE=true run-s build run_mocha",
+        "run_mocha": "mocha --require source-map-support/register --require make-promises-safe 'lib/test/**/*.js' --timeout 100000 --bail --exit",
+        "compile": "sol-compiler",
+        "watch": "sol-compiler -w",
+        "clean": "shx rm -rf lib test/generated-artifacts test/generated-wrappers generated-artifacts generated-wrappers",
+        "generate_contract_wrappers": "abi-gen --debug --abis  ${npm_package_config_abis} --output test/generated-wrappers --backend ethers",
+        "lint": "tslint --format stylish --project . --exclude ./generated-wrappers/**/* --exclude ./test/generated-wrappers/**/* --exclude ./generated-artifacts/**/* --exclude ./test/generated-artifacts/**/* --exclude **/lib/**/* && yarn lint-contracts",
+        "fix": "tslint --fix --format stylish --project . --exclude ./generated-wrappers/**/* --exclude ./generated-artifacts/**/* --exclude ./test/generated-wrappers/**/* --exclude ./test/generated-artifacts/**/* --exclude **/lib/**/* && yarn lint-contracts",
+        "coverage:report:text": "istanbul report text",
+        "coverage:report:html": "istanbul report html && open coverage/index.html",
+        "profiler:report:html": "istanbul report html && open coverage/index.html",
+        "coverage:report:lcov": "istanbul report lcov",
+        "test:circleci": "yarn test",
+        "contracts:gen": "contracts-gen generate",
+        "contracts:copy": "contracts-gen copy",
+        "lint-contracts": "solhint -c ../.solhint.json contracts/**/**/**/**/*.sol",
+        "compile:truffle": "truffle compile"
+    },
+    "config": {
+        "publicInterfaceContracts": "ERC20BridgeSampler,IERC20BridgeSampler",
+        "abis:comment": "This list is auto-generated by contracts-gen. Don't edit manually.",
+        "abis": "./test/generated-artifacts/@(DeploymentConstants|ERC20BridgeSampler|IERC20BridgeSampler|IEth2Dai|IKyberNetwork|IUniswapExchangeQuotes|TestERC20BridgeSampler).json"
+    },
+    "repository": {
+        "type": "git",
+        "url": "https://github.com/0xProject/0x-monorepo.git"
+    },
+    "license": "Apache-2.0",
+    "bugs": {
+        "url": "https://github.com/0xProject/0x-monorepo/issues"
+    },
+    "homepage": "https://github.com/0xProject/0x-monorepo/contracts/protocol/README.md",
+    "devDependencies": {
+        "@0x/abi-gen": "^5.0.0",
+        "@0x/contracts-asset-proxy": "^3.0.0",
+        "@0x/contracts-erc20": "^3.0.0",
+        "@0x/contracts-exchange": "^3.0.0",
+        "@0x/contracts-exchange-libs": "^4.0.0",
+        "@0x/contracts-gen": "^2.0.0",
+        "@0x/contracts-test-utils": "^4.0.0",
+        "@0x/contracts-utils": "^4.0.0",
+        "@0x/dev-utils": "^3.0.0",
+        "@0x/sol-compiler": "^4.0.0",
+        "@0x/tslint-config": "^4.0.0",
+        "@0x/web3-wrapper": "^7.0.0",
+        "@types/lodash": "4.14.104",
+        "@types/mocha": "^5.2.7",
+        "@types/node": "*",
+        "chai": "^4.0.1",
+        "chai-as-promised": "^7.1.0",
+        "chai-bignumber": "^3.0.0",
+        "dirty-chai": "^2.0.1",
+        "make-promises-safe": "^1.1.0",
+        "mocha": "^6.2.0",
+        "npm-run-all": "^4.1.2",
+        "shx": "^0.2.2",
+        "solhint": "^1.4.1",
+        "truffle": "^5.0.32",
+        "tslint": "5.11.0",
+        "typescript": "3.0.1"
+    },
+    "dependencies": {
+        "@0x/base-contract": "^6.0.0",
+        "@0x/types": "^3.0.0",
+        "@0x/typescript-typings": "^5.0.0",
+        "@0x/utils": "^5.0.0",
+        "ethereum-types": "^3.0.0",
+        "lodash": "^4.17.11"
+    },
+    "publishConfig": {
+        "access": "public"
+    }
+}

contracts/erc20-bridge-sampler/src/artifacts.ts

@@ -0,0 +1,13 @@
+/*
+ * -----------------------------------------------------------------------------
+ * Warning: This file is auto-generated by contracts-gen. Don't edit manually.
+ * -----------------------------------------------------------------------------
+ */
+import { ContractArtifact } from 'ethereum-types';
+
+import * as ERC20BridgeSampler from '../generated-artifacts/ERC20BridgeSampler.json';
+import * as IERC20BridgeSampler from '../generated-artifacts/IERC20BridgeSampler.json';
+export const artifacts = {
+    ERC20BridgeSampler: ERC20BridgeSampler as ContractArtifact,
+    IERC20BridgeSampler: IERC20BridgeSampler as ContractArtifact,
+};

contracts/erc20-bridge-sampler/src/index.ts

@@ -0,0 +1,2 @@
+export * from './wrappers';
+export * from './artifacts';

contracts/erc20-bridge-sampler/src/wrappers.ts

@@ -0,0 +1,7 @@
+/*
+ * -----------------------------------------------------------------------------
+ * Warning: This file is auto-generated by contracts-gen. Don't edit manually.
+ * -----------------------------------------------------------------------------
+ */
+export * from '../generated-wrappers/erc20_bridge_sampler';
+export * from '../generated-wrappers/i_erc20_bridge_sampler';

contracts/erc20-bridge-sampler/test/artifacts.ts

@@ -0,0 +1,23 @@
+/*
+ * -----------------------------------------------------------------------------
+ * Warning: This file is auto-generated by contracts-gen. Don't edit manually.
+ * -----------------------------------------------------------------------------
+ */
+import { ContractArtifact } from 'ethereum-types';
+
+import * as DeploymentConstants from '../test/generated-artifacts/DeploymentConstants.json';
+import * as ERC20BridgeSampler from '../test/generated-artifacts/ERC20BridgeSampler.json';
+import * as IERC20BridgeSampler from '../test/generated-artifacts/IERC20BridgeSampler.json';
+import * as IEth2Dai from '../test/generated-artifacts/IEth2Dai.json';
+import * as IKyberNetwork from '../test/generated-artifacts/IKyberNetwork.json';
+import * as IUniswapExchangeQuotes from '../test/generated-artifacts/IUniswapExchangeQuotes.json';
+import * as TestERC20BridgeSampler from '../test/generated-artifacts/TestERC20BridgeSampler.json';
+export const artifacts = {
+    DeploymentConstants: DeploymentConstants as ContractArtifact,
+    ERC20BridgeSampler: ERC20BridgeSampler as ContractArtifact,
+    IERC20BridgeSampler: IERC20BridgeSampler as ContractArtifact,
+    IEth2Dai: IEth2Dai as ContractArtifact,
+    IKyberNetwork: IKyberNetwork as ContractArtifact,
+    IUniswapExchangeQuotes: IUniswapExchangeQuotes as ContractArtifact,
+    TestERC20BridgeSampler: TestERC20BridgeSampler as ContractArtifact,
+};

contracts/erc20-bridge-sampler/test/erc20-bridge-sampler.ts

@@ -0,0 +1,852 @@
+import {
+    blockchainTests,
+    constants,
+    expect,
+    getRandomInteger,
+    getRandomPortion,
+    hexConcat,
+    hexHash,
+    hexLeftPad,
+    hexRandom,
+    randomAddress,
+    toHex,
+} from '@0x/contracts-test-utils';
+import { Order, OrderInfo } from '@0x/types';
+import { BigNumber } from '@0x/utils';
+import * as _ from 'lodash';
+
+import { artifacts } from './artifacts';
+import { TestERC20BridgeSamplerContract } from './wrappers';
+
+blockchainTests('erc20-bridge-sampler', env => {
+    let testContract: TestERC20BridgeSamplerContract;
+    let allSources: { [name: string]: string };
+    const RATE_DENOMINATOR = constants.ONE_ETHER;
+    const MIN_RATE = new BigNumber('0.01');
+    const MAX_RATE = new BigNumber('100');
+    const MIN_DECIMALS = 4;
+    const MAX_DECIMALS = 20;
+    const WETH_ADDRESS = '0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2';
+    const KYBER_SALT = '0x0ff3ca9d46195c39f9a12afb74207b4970349fb3cfb1e459bbf170298d326bc7';
+    const ETH2DAI_SALT = '0xb713b61bb9bb2958a0f5d1534b21e94fc68c4c0c034b0902ed844f2f6cd1b4f7';
+    const UNISWAP_BASE_SALT = '0x1d6a6a0506b0b4a554b907a4c29d9f4674e461989d9c1921feb17b26716385ab';
+    const ERC20_PROXY_ID = '0xf47261b0';
+    const INVALID_ASSET_PROXY_ASSET_DATA = hexConcat('0xf47261b1', hexLeftPad(randomAddress()));
+    const INVALID_ASSET_DATA = hexRandom(37);
+    const SELL_SOURCES = ['Eth2Dai', 'Kyber', 'Uniswap'];
+    const BUY_SOURCES = ['Eth2Dai', 'Uniswap'];
+    const EMPTY_ORDERS_ERROR = 'EMPTY_ORDERS';
+    const UNSUPPORTED_ASSET_PROXY_ERROR = 'UNSUPPORTED_ASSET_PROXY';
+    const INVALID_ASSET_DATA_ERROR = 'INVALID_ASSET_DATA';
+    const UNSUPPORTED_UNISWAP_EXCHANGE_ERROR = 'UNSUPPORTED_UNISWAP_EXCHANGE';
+    const UNSUPPORTED_SOURCE_ERROR = 'UNSUPPORTED_SOURCE';
+    const INVALID_TOKEN_PAIR_ERROR = 'INVALID_TOKEN_PAIR';
+
+    before(async () => {
+        testContract = await TestERC20BridgeSamplerContract.deployFrom0xArtifactAsync(
+            artifacts.TestERC20BridgeSampler,
+            env.provider,
+            env.txDefaults,
+            {},
+        );
+        allSources = _.zipObject(
+            ['Uniswap', 'Eth2Dai', 'Kyber'],
+            [
+                await testContract.uniswap().callAsync(),
+                await testContract.eth2Dai().callAsync(),
+                await testContract.kyber().callAsync(),
+            ],
+        );
+    });
+
+    function getPackedHash(...args: string[]): string {
+        return hexHash(hexConcat(...args.map(a => toHex(a))));
+    }
+
+    function getUniswapExchangeSalt(tokenAddress: string): string {
+        return getPackedHash(UNISWAP_BASE_SALT, tokenAddress);
+    }
+
+    function getDeterministicRate(salt: string, sellToken: string, buyToken: string): BigNumber {
+        const hash = getPackedHash(salt, sellToken, buyToken);
+        const _minRate = RATE_DENOMINATOR.times(MIN_RATE);
+        const _maxRate = RATE_DENOMINATOR.times(MAX_RATE);
+        return new BigNumber(hash)
+            .mod(_maxRate.minus(_minRate))
+            .plus(_minRate)
+            .div(RATE_DENOMINATOR);
+    }
+
+    function getDeterministicTokenDecimals(token: string): number {
+        if (token === WETH_ADDRESS) {
+            return 18;
+        }
+        // HACK(dorothy-zbornak): Linter will complain about the addition not being
+        // between two numbers, even though they are.
+        // tslint:disable-next-line restrict-plus-operands
+        return new BigNumber(getPackedHash(token)).mod(MAX_DECIMALS - MIN_DECIMALS).toNumber() + MIN_DECIMALS;
+    }
+
+    function getDeterministicSellQuote(
+        salt: string,
+        sellToken: string,
+        buyToken: string,
+        sellAmount: BigNumber,
+    ): BigNumber {
+        const sellBase = new BigNumber(10).pow(getDeterministicTokenDecimals(sellToken));
+        const buyBase = new BigNumber(10).pow(getDeterministicTokenDecimals(buyToken));
+        const rate = getDeterministicRate(salt, sellToken, buyToken);
+        return sellAmount
+            .times(rate)
+            .times(buyBase)
+            .dividedToIntegerBy(sellBase);
+    }
+
+    function getDeterministicBuyQuote(
+        salt: string,
+        sellToken: string,
+        buyToken: string,
+        buyAmount: BigNumber,
+    ): BigNumber {
+        const sellBase = new BigNumber(10).pow(getDeterministicTokenDecimals(sellToken));
+        const buyBase = new BigNumber(10).pow(getDeterministicTokenDecimals(buyToken));
+        const rate = getDeterministicRate(salt, sellToken, buyToken);
+        return buyAmount
+            .times(sellBase)
+            .dividedToIntegerBy(rate)
+            .dividedToIntegerBy(buyBase);
+    }
+
+    function areAddressesEqual(a: string, b: string): boolean {
+        return a.toLowerCase() === b.toLowerCase();
+    }
+
+    function getDeterministicUniswapSellQuote(sellToken: string, buyToken: string, sellAmount: BigNumber): BigNumber {
+        if (areAddressesEqual(buyToken, WETH_ADDRESS)) {
+            return getDeterministicSellQuote(getUniswapExchangeSalt(sellToken), sellToken, WETH_ADDRESS, sellAmount);
+        }
+        if (areAddressesEqual(sellToken, WETH_ADDRESS)) {
+            return getDeterministicSellQuote(getUniswapExchangeSalt(buyToken), buyToken, WETH_ADDRESS, sellAmount);
+        }
+        const ethBought = getDeterministicSellQuote(
+            getUniswapExchangeSalt(sellToken),
+            sellToken,
+            WETH_ADDRESS,
+            sellAmount,
+        );
+        return getDeterministicSellQuote(getUniswapExchangeSalt(buyToken), buyToken, WETH_ADDRESS, ethBought);
+    }
+
+    function getDeterministicUniswapBuyQuote(sellToken: string, buyToken: string, buyAmount: BigNumber): BigNumber {
+        if (areAddressesEqual(buyToken, WETH_ADDRESS)) {
+            return getDeterministicBuyQuote(getUniswapExchangeSalt(sellToken), WETH_ADDRESS, sellToken, buyAmount);
+        }
+        if (areAddressesEqual(sellToken, WETH_ADDRESS)) {
+            return getDeterministicBuyQuote(getUniswapExchangeSalt(buyToken), WETH_ADDRESS, buyToken, buyAmount);
+        }
+        const ethSold = getDeterministicBuyQuote(getUniswapExchangeSalt(buyToken), WETH_ADDRESS, buyToken, buyAmount);
+        return getDeterministicBuyQuote(getUniswapExchangeSalt(sellToken), WETH_ADDRESS, sellToken, ethSold);
+    }
+
+    function getDeterministicSellQuotes(
+        sellToken: string,
+        buyToken: string,
+        sources: string[],
+        sampleAmounts: BigNumber[],
+    ): BigNumber[][] {
+        const quotes: BigNumber[][] = [];
+        for (const source of sources) {
+            const sampleOutputs = [];
+            for (const amount of sampleAmounts) {
+                if (source === 'Kyber' || source === 'Eth2Dai') {
+                    sampleOutputs.push(
+                        getDeterministicSellQuote(
+                            source === 'Kyber' ? KYBER_SALT : ETH2DAI_SALT,
+                            sellToken,
+                            buyToken,
+                            amount,
+                        ),
+                    );
+                } else if (source === 'Uniswap') {
+                    sampleOutputs.push(getDeterministicUniswapSellQuote(sellToken, buyToken, amount));
+                }
+            }
+            quotes.push(sampleOutputs);
+        }
+        return quotes;
+    }
+
+    function getDeterministicBuyQuotes(
+        sellToken: string,
+        buyToken: string,
+        sources: string[],
+        sampleAmounts: BigNumber[],
+    ): BigNumber[][] {
+        const quotes: BigNumber[][] = [];
+        for (const source of sources) {
+            const sampleOutputs = [];
+            for (const amount of sampleAmounts) {
+                if (source === 'Eth2Dai') {
+                    sampleOutputs.push(getDeterministicBuyQuote(ETH2DAI_SALT, sellToken, buyToken, amount));
+                } else if (source === 'Uniswap') {
+                    sampleOutputs.push(getDeterministicUniswapBuyQuote(sellToken, buyToken, amount));
+                }
+            }
+            quotes.push(sampleOutputs);
+        }
+        return quotes;
+    }
+
+    function getDeterministicOrderInfo(order: Order): OrderInfo {
+        const hash = getPackedHash(toHex(order.salt, 32));
+        return {
+            orderHash: hash,
+            orderStatus: new BigNumber(hash).mod(255).toNumber(),
+            orderTakerAssetFilledAmount: new BigNumber(hash).mod(order.takerAssetAmount),
+        };
+    }
+
+    function getERC20AssetData(tokenAddress: string): string {
+        return hexConcat(ERC20_PROXY_ID, hexLeftPad(tokenAddress));
+    }
+
+    function getSampleAmounts(tokenAddress: string, count?: number): BigNumber[] {
+        const tokenDecimals = getDeterministicTokenDecimals(tokenAddress);
+        const _upperLimit = getRandomPortion(getRandomInteger(1, 1000).times(10 ** tokenDecimals));
+        const _count = count || _.random(1, 16);
+        const d = _upperLimit.div(_count);
+        return _.times(_count, i => d.times((i + 1) / _count).integerValue());
+    }
+
+    function createOrder(makerToken: string, takerToken: string): Order {
+        return {
+            chainId: 1337,
+            exchangeAddress: randomAddress(),
+            makerAddress: randomAddress(),
+            takerAddress: randomAddress(),
+            senderAddress: randomAddress(),
+            feeRecipientAddress: randomAddress(),
+            makerAssetAmount: getRandomInteger(1, 1e18),
+            takerAssetAmount: getRandomInteger(1, 1e18),
+            makerFee: getRandomInteger(1, 1e18),
+            takerFee: getRandomInteger(1, 1e18),
+            makerAssetData: getERC20AssetData(makerToken),
+            takerAssetData: getERC20AssetData(takerToken),
+            makerFeeAssetData: getERC20AssetData(randomAddress()),
+            takerFeeAssetData: getERC20AssetData(randomAddress()),
+            salt: new BigNumber(hexRandom()),
+            expirationTimeSeconds: getRandomInteger(0, 2 ** 32),
+        };
+    }
+
+    function createOrders(makerToken: string, takerToken: string, count?: number): Order[] {
+        return _.times(count || _.random(1, 16), () => createOrder(makerToken, takerToken));
+    }
+
+    describe('queryOrders()', () => {
+        const MAKER_TOKEN = randomAddress();
+        const TAKER_TOKEN = randomAddress();
+
+        it('returns the results of `getOrderInfo()` for each order', async () => {
+            const orders = createOrders(MAKER_TOKEN, TAKER_TOKEN);
+            const expected = orders.map(getDeterministicOrderInfo);
+            const actual = await testContract.queryOrders(orders).callAsync();
+            expect(actual).to.deep.eq(expected);
+        });
+
+        it('returns empty for no orders', async () => {
+            const actual = await testContract.queryOrders([]).callAsync();
+            expect(actual).to.deep.eq([]);
+        });
+    });
+
+    describe('queryOrdersAndSampleSells()', () => {
+        const MAKER_TOKEN = randomAddress();
+        const TAKER_TOKEN = randomAddress();
+
+        before(async () => {
+            await testContract.createTokenExchanges([MAKER_TOKEN, TAKER_TOKEN]).awaitTransactionSuccessAsync();
+        });
+
+        it('returns the results of `getOrderInfo()` for each order', async () => {
+            const takerTokenAmounts = getSampleAmounts(TAKER_TOKEN);
+            const orders = createOrders(MAKER_TOKEN, TAKER_TOKEN);
+            const expectedOrderInfos = orders.map(getDeterministicOrderInfo);
+            const [orderInfos] = await testContract
+                .queryOrdersAndSampleSells(orders, SELL_SOURCES.map(n => allSources[n]), takerTokenAmounts)
+                .callAsync();
+            expect(orderInfos).to.deep.eq(expectedOrderInfos);
+        });
+
+        it('can return quotes for all sources', async () => {
+            const sampleAmounts = getSampleAmounts(TAKER_TOKEN);
+            const expectedQuotes = getDeterministicSellQuotes(TAKER_TOKEN, MAKER_TOKEN, SELL_SOURCES, sampleAmounts);
+            const [, quotes] = await testContract
+                .queryOrdersAndSampleSells(
+                    createOrders(MAKER_TOKEN, TAKER_TOKEN),
+                    SELL_SOURCES.map(n => allSources[n]),
+                    sampleAmounts,
+                )
+                .callAsync();
+            expect(quotes).to.deep.eq(expectedQuotes);
+        });
+
+        it('throws if no orders are passed in', async () => {
+            const tx = testContract
+                .queryOrdersAndSampleSells([], SELL_SOURCES.map(n => allSources[n]), getSampleAmounts(TAKER_TOKEN))
+                .callAsync();
+            return expect(tx).to.revertWith(EMPTY_ORDERS_ERROR);
+        });
+
+        it('throws with an unsupported source', async () => {
+            const tx = testContract
+                .queryOrdersAndSampleSells(
+                    createOrders(MAKER_TOKEN, TAKER_TOKEN),
+                    [...SELL_SOURCES.map(n => allSources[n]), randomAddress()],
+                    getSampleAmounts(TAKER_TOKEN),
+                )
+                .callAsync();
+            return expect(tx).to.revertWith(UNSUPPORTED_SOURCE_ERROR);
+        });
+
+        it('throws with non-ERC20 maker asset data', async () => {
+            const tx = testContract
+                .queryOrdersAndSampleSells(
+                    createOrders(MAKER_TOKEN, TAKER_TOKEN).map(o => ({
+                        ...o,
+                        makerAssetData: INVALID_ASSET_PROXY_ASSET_DATA,
+                    })),
+                    SELL_SOURCES.map(n => allSources[n]),
+                    getSampleAmounts(TAKER_TOKEN),
+                )
+                .callAsync();
+            return expect(tx).to.revertWith(UNSUPPORTED_ASSET_PROXY_ERROR);
+        });
+
+        it('throws with non-ERC20 taker asset data', async () => {
+            const tx = testContract
+                .queryOrdersAndSampleSells(
+                    createOrders(MAKER_TOKEN, TAKER_TOKEN).map(o => ({
+                        ...o,
+                        takerAssetData: INVALID_ASSET_PROXY_ASSET_DATA,
+                    })),
+                    SELL_SOURCES.map(n => allSources[n]),
+                    getSampleAmounts(TAKER_TOKEN),
+                )
+                .callAsync();
+            return expect(tx).to.revertWith(UNSUPPORTED_ASSET_PROXY_ERROR);
+        });
+
+        it('throws with invalid maker asset data', async () => {
+            const tx = testContract
+                .queryOrdersAndSampleSells(
+                    createOrders(MAKER_TOKEN, TAKER_TOKEN).map(o => ({
+                        ...o,
+                        makerAssetData: INVALID_ASSET_DATA,
+                    })),
+                    SELL_SOURCES.map(n => allSources[n]),
+                    getSampleAmounts(TAKER_TOKEN),
+                )
+                .callAsync();
+            return expect(tx).to.revertWith(INVALID_ASSET_DATA_ERROR);
+        });
+
+        it('throws with invalid taker asset data', async () => {
+            const tx = testContract
+                .queryOrdersAndSampleSells(
+                    createOrders(MAKER_TOKEN, TAKER_TOKEN).map(o => ({
+                        ...o,
+                        takerAssetData: INVALID_ASSET_DATA,
+                    })),
+                    SELL_SOURCES.map(n => allSources[n]),
+                    getSampleAmounts(TAKER_TOKEN),
+                )
+                .callAsync();
+            return expect(tx).to.revertWith(INVALID_ASSET_DATA_ERROR);
+        });
+    });
+
+    describe('queryOrdersAndSampleBuys()', () => {
+        const MAKER_TOKEN = randomAddress();
+        const TAKER_TOKEN = randomAddress();
+
+        before(async () => {
+            await testContract.createTokenExchanges([MAKER_TOKEN, TAKER_TOKEN]).awaitTransactionSuccessAsync();
+        });
+
+        it('returns the results of `getOrderInfo()` for each order', async () => {
+            const takerTokenAmounts = getSampleAmounts(MAKER_TOKEN);
+            const orders = createOrders(MAKER_TOKEN, TAKER_TOKEN);
+            const expectedOrderInfos = orders.map(getDeterministicOrderInfo);
+            const [orderInfos] = await testContract
+                .queryOrdersAndSampleBuys(orders, BUY_SOURCES.map(n => allSources[n]), takerTokenAmounts)
+                .callAsync();
+            expect(orderInfos).to.deep.eq(expectedOrderInfos);
+        });
+
+        it('can return quotes for all sources', async () => {
+            const sampleAmounts = getSampleAmounts(MAKER_TOKEN);
+            const expectedQuotes = getDeterministicBuyQuotes(TAKER_TOKEN, MAKER_TOKEN, BUY_SOURCES, sampleAmounts);
+            const [, quotes] = await testContract
+                .queryOrdersAndSampleBuys(
+                    createOrders(MAKER_TOKEN, TAKER_TOKEN),
+                    BUY_SOURCES.map(n => allSources[n]),
+                    sampleAmounts,
+                )
+                .callAsync();
+            expect(quotes).to.deep.eq(expectedQuotes);
+        });
+
+        it('throws if no orders are passed in', async () => {
+            const tx = testContract
+                .queryOrdersAndSampleBuys([], BUY_SOURCES.map(n => allSources[n]), getSampleAmounts(MAKER_TOKEN))
+                .callAsync();
+            return expect(tx).to.revertWith(EMPTY_ORDERS_ERROR);
+        });
+
+        it('throws with an unsupported source', async () => {
+            const tx = testContract
+                .queryOrdersAndSampleBuys(
+                    createOrders(MAKER_TOKEN, TAKER_TOKEN),
+                    [...BUY_SOURCES.map(n => allSources[n]), randomAddress()],
+                    getSampleAmounts(MAKER_TOKEN),
+                )
+                .callAsync();
+            return expect(tx).to.revertWith(UNSUPPORTED_SOURCE_ERROR);
+        });
+
+        it('throws if kyber is passed in as a source', async () => {
+            const sources = [...BUY_SOURCES, 'Kyber'];
+            const tx = testContract
+                .queryOrdersAndSampleBuys(
+                    createOrders(MAKER_TOKEN, TAKER_TOKEN),
+                    sources.map(n => allSources[n]),
+                    getSampleAmounts(MAKER_TOKEN),
+                )
+                .callAsync();
+            return expect(tx).to.revertWith(UNSUPPORTED_SOURCE_ERROR);
+        });
+
+        it('throws with non-ERC20 maker asset data', async () => {
+            const tx = testContract
+                .queryOrdersAndSampleBuys(
+                    createOrders(MAKER_TOKEN, TAKER_TOKEN).map(o => ({
+                        ...o,
+                        makerAssetData: INVALID_ASSET_PROXY_ASSET_DATA,
+                    })),
+                    BUY_SOURCES.map(n => allSources[n]),
+                    getSampleAmounts(MAKER_TOKEN),
+                )
+                .callAsync();
+            return expect(tx).to.revertWith(UNSUPPORTED_ASSET_PROXY_ERROR);
+        });
+
+        it('throws with non-ERC20 taker asset data', async () => {
+            const tx = testContract
+                .queryOrdersAndSampleBuys(
+                    createOrders(MAKER_TOKEN, TAKER_TOKEN).map(o => ({
+                        ...o,
+                        takerAssetData: INVALID_ASSET_PROXY_ASSET_DATA,
+                    })),
+                    BUY_SOURCES.map(n => allSources[n]),
+                    getSampleAmounts(MAKER_TOKEN),
+                )
+                .callAsync();
+            return expect(tx).to.revertWith(UNSUPPORTED_ASSET_PROXY_ERROR);
+        });
+
+        it('throws with invalid maker asset data', async () => {
+            const tx = testContract
+                .queryOrdersAndSampleBuys(
+                    createOrders(MAKER_TOKEN, TAKER_TOKEN).map(o => ({
+                        ...o,
+                        makerAssetData: INVALID_ASSET_DATA,
+                    })),
+                    BUY_SOURCES.map(n => allSources[n]),
+                    getSampleAmounts(MAKER_TOKEN),
+                )
+                .callAsync();
+            return expect(tx).to.revertWith(INVALID_ASSET_DATA_ERROR);
+        });
+
+        it('throws with invalid taker asset data', async () => {
+            const tx = testContract
+                .queryOrdersAndSampleBuys(
+                    createOrders(MAKER_TOKEN, TAKER_TOKEN).map(o => ({
+                        ...o,
+                        takerAssetData: INVALID_ASSET_DATA,
+                    })),
+                    BUY_SOURCES.map(n => allSources[n]),
+                    getSampleAmounts(MAKER_TOKEN),
+                )
+                .callAsync();
+            return expect(tx).to.revertWith(INVALID_ASSET_DATA_ERROR);
+        });
+    });
+
+    describe('sampleSells()', () => {
+        const MAKER_TOKEN = randomAddress();
+        const TAKER_TOKEN = randomAddress();
+
+        before(async () => {
+            await testContract.createTokenExchanges([MAKER_TOKEN, TAKER_TOKEN]).awaitTransactionSuccessAsync();
+        });
+
+        it('returns empty quotes with no sample amounts', async () => {
+            const emptyQuotes = _.times(SELL_SOURCES.length, () => []);
+            const quotes = await testContract
+                .sampleSells(SELL_SOURCES.map(n => allSources[n]), TAKER_TOKEN, MAKER_TOKEN, [])
+                .callAsync();
+            expect(quotes).to.deep.eq(emptyQuotes);
+        });
+
+        it('can return quotes for all sources', async () => {
+            const sampleAmounts = getSampleAmounts(TAKER_TOKEN);
+            const expectedQuotes = getDeterministicSellQuotes(TAKER_TOKEN, MAKER_TOKEN, SELL_SOURCES, sampleAmounts);
+            const quotes = await testContract
+                .sampleSells(SELL_SOURCES.map(n => allSources[n]), TAKER_TOKEN, MAKER_TOKEN, sampleAmounts)
+                .callAsync();
+            expect(quotes).to.deep.eq(expectedQuotes);
+        });
+
+        it('can return quotes for some sources', async () => {
+            const sampleAmounts = getSampleAmounts(TAKER_TOKEN);
+            const sources = _.sampleSize(SELL_SOURCES, 1);
+            const expectedQuotes = getDeterministicSellQuotes(TAKER_TOKEN, MAKER_TOKEN, sources, sampleAmounts);
+            const quotes = await testContract
+                .sampleSells(sources.map(n => allSources[n]), TAKER_TOKEN, MAKER_TOKEN, sampleAmounts)
+                .callAsync();
+            expect(quotes).to.deep.eq(expectedQuotes);
+        });
+
+        it('throws with an unsupported source', async () => {
+            const tx = testContract
+                .sampleSells(
+                    [...SELL_SOURCES.map(n => allSources[n]), randomAddress()],
+                    TAKER_TOKEN,
+                    MAKER_TOKEN,
+                    getSampleAmounts(TAKER_TOKEN),
+                )
+                .callAsync();
+            return expect(tx).to.revertWith(UNSUPPORTED_SOURCE_ERROR);
+        });
+    });
+
+    describe('sampleBuys()', () => {
+        const MAKER_TOKEN = randomAddress();
+        const TAKER_TOKEN = randomAddress();
+
+        before(async () => {
+            await testContract.createTokenExchanges([MAKER_TOKEN, TAKER_TOKEN]).awaitTransactionSuccessAsync();
+        });
+
+        it('returns empty quotes with no sample amounts', async () => {
+            const emptyQuotes = _.times(BUY_SOURCES.length, () => []);
+            const quotes = await testContract
+                .sampleBuys(BUY_SOURCES.map(n => allSources[n]), TAKER_TOKEN, MAKER_TOKEN, [])
+                .callAsync();
+            expect(quotes).to.deep.eq(emptyQuotes);
+        });
+
+        it('can return quotes for all sources', async () => {
+            const sampleAmounts = getSampleAmounts(MAKER_TOKEN);
+            const expectedQuotes = getDeterministicBuyQuotes(TAKER_TOKEN, MAKER_TOKEN, BUY_SOURCES, sampleAmounts);
+            const quotes = await testContract
+                .sampleBuys(BUY_SOURCES.map(n => allSources[n]), TAKER_TOKEN, MAKER_TOKEN, sampleAmounts)
+                .callAsync();
+            expect(quotes).to.deep.eq(expectedQuotes);
+        });
+
+        it('can return quotes for some sources', async () => {
+            const sampleAmounts = getSampleAmounts(MAKER_TOKEN);
+            const sources = _.sampleSize(BUY_SOURCES, 1);
+            const expectedQuotes = getDeterministicBuyQuotes(TAKER_TOKEN, MAKER_TOKEN, sources, sampleAmounts);
+            const quotes = await testContract
+                .sampleBuys(sources.map(n => allSources[n]), TAKER_TOKEN, MAKER_TOKEN, sampleAmounts)
+                .callAsync();
+            expect(quotes).to.deep.eq(expectedQuotes);
+        });
+
+        it('throws with an unsupported source', async () => {
+            const tx = testContract
+                .sampleBuys(
+                    [...BUY_SOURCES.map(n => allSources[n]), randomAddress()],
+                    TAKER_TOKEN,
+                    MAKER_TOKEN,
+                    getSampleAmounts(MAKER_TOKEN),
+                )
+                .callAsync();
+            return expect(tx).to.revertWith(UNSUPPORTED_SOURCE_ERROR);
+        });
+
+        it('throws if kyber is passed in as a source', async () => {
+            const sources = [...BUY_SOURCES, 'Kyber'];
+            const tx = testContract
+                .sampleBuys(sources.map(n => allSources[n]), TAKER_TOKEN, MAKER_TOKEN, getSampleAmounts(MAKER_TOKEN))
+                .callAsync();
+            return expect(tx).to.revertWith(UNSUPPORTED_SOURCE_ERROR);
+        });
+    });
+
+    describe('sampleSellsFromKyberNetwork()', () => {
+        const MAKER_TOKEN = randomAddress();
+        const TAKER_TOKEN = randomAddress();
+
+        before(async () => {
+            await testContract.createTokenExchanges([MAKER_TOKEN, TAKER_TOKEN]).awaitTransactionSuccessAsync();
+        });
+
+        it('throws if tokens are the same', async () => {
+            const tx = testContract.sampleSellsFromKyberNetwork(MAKER_TOKEN, MAKER_TOKEN, []).callAsync();
+            return expect(tx).to.revertWith(INVALID_TOKEN_PAIR_ERROR);
+        });
+
+        it('can return no quotes', async () => {
+            const quotes = await testContract.sampleSellsFromKyberNetwork(TAKER_TOKEN, MAKER_TOKEN, []).callAsync();
+            expect(quotes).to.deep.eq([]);
+        });
+
+        it('can return many quotes', async () => {
+            const sampleAmounts = getSampleAmounts(TAKER_TOKEN);
+            const [expectedQuotes] = getDeterministicSellQuotes(TAKER_TOKEN, MAKER_TOKEN, ['Kyber'], sampleAmounts);
+            const quotes = await testContract
+                .sampleSellsFromKyberNetwork(TAKER_TOKEN, MAKER_TOKEN, sampleAmounts)
+                .callAsync();
+            expect(quotes).to.deep.eq(expectedQuotes);
+        });
+
+        it('can quote token -> ETH', async () => {
+            const sampleAmounts = getSampleAmounts(TAKER_TOKEN);
+            const [expectedQuotes] = getDeterministicSellQuotes(TAKER_TOKEN, WETH_ADDRESS, ['Kyber'], sampleAmounts);
+            const quotes = await testContract
+                .sampleSellsFromKyberNetwork(TAKER_TOKEN, WETH_ADDRESS, sampleAmounts)
+                .callAsync();
+            expect(quotes).to.deep.eq(expectedQuotes);
+        });
+
+        it('can quote ETH -> token', async () => {
+            const sampleAmounts = getSampleAmounts(TAKER_TOKEN);
+            const [expectedQuotes] = getDeterministicSellQuotes(WETH_ADDRESS, TAKER_TOKEN, ['Kyber'], sampleAmounts);
+            const quotes = await testContract
+                .sampleSellsFromKyberNetwork(WETH_ADDRESS, TAKER_TOKEN, sampleAmounts)
+                .callAsync();
+            expect(quotes).to.deep.eq(expectedQuotes);
+        });
+    });
+
+    describe('sampleSellsFromEth2Dai()', () => {
+        const MAKER_TOKEN = randomAddress();
+        const TAKER_TOKEN = randomAddress();
+
+        before(async () => {
+            await testContract.createTokenExchanges([MAKER_TOKEN, TAKER_TOKEN]).awaitTransactionSuccessAsync();
+        });
+
+        it('throws if tokens are the same', async () => {
+            const tx = testContract.sampleSellsFromEth2Dai(MAKER_TOKEN, MAKER_TOKEN, []).callAsync();
+            return expect(tx).to.revertWith(INVALID_TOKEN_PAIR_ERROR);
+        });
+
+        it('can return no quotes', async () => {
+            const quotes = await testContract.sampleSellsFromEth2Dai(TAKER_TOKEN, MAKER_TOKEN, []).callAsync();
+            expect(quotes).to.deep.eq([]);
+        });
+
+        it('can return many quotes', async () => {
+            const sampleAmounts = getSampleAmounts(TAKER_TOKEN);
+            const [expectedQuotes] = getDeterministicSellQuotes(TAKER_TOKEN, MAKER_TOKEN, ['Eth2Dai'], sampleAmounts);
+            const quotes = await testContract
+                .sampleSellsFromEth2Dai(TAKER_TOKEN, MAKER_TOKEN, sampleAmounts)
+                .callAsync();
+            expect(quotes).to.deep.eq(expectedQuotes);
+        });
+
+        it('can quote token -> ETH', async () => {
+            const sampleAmounts = getSampleAmounts(TAKER_TOKEN);
+            const [expectedQuotes] = getDeterministicSellQuotes(TAKER_TOKEN, WETH_ADDRESS, ['Eth2Dai'], sampleAmounts);
+            const quotes = await testContract
+                .sampleSellsFromEth2Dai(TAKER_TOKEN, WETH_ADDRESS, sampleAmounts)
+                .callAsync();
+            expect(quotes).to.deep.eq(expectedQuotes);
+        });
+
+        it('can quote ETH -> token', async () => {
+            const sampleAmounts = getSampleAmounts(TAKER_TOKEN);
+            const [expectedQuotes] = getDeterministicSellQuotes(WETH_ADDRESS, TAKER_TOKEN, ['Eth2Dai'], sampleAmounts);
+            const quotes = await testContract
+                .sampleSellsFromEth2Dai(WETH_ADDRESS, TAKER_TOKEN, sampleAmounts)
+                .callAsync();
+            expect(quotes).to.deep.eq(expectedQuotes);
+        });
+    });
+
+    describe('sampleBuysFromEth2Dai()', () => {
+        const MAKER_TOKEN = randomAddress();
+        const TAKER_TOKEN = randomAddress();
+
+        before(async () => {
+            await testContract.createTokenExchanges([MAKER_TOKEN, TAKER_TOKEN]).awaitTransactionSuccessAsync();
+        });
+
+        it('throws if tokens are the same', async () => {
+            const tx = testContract.sampleBuysFromEth2Dai(MAKER_TOKEN, MAKER_TOKEN, []).callAsync();
+            return expect(tx).to.revertWith(INVALID_TOKEN_PAIR_ERROR);
+        });
+
+        it('can return no quotes', async () => {
+            const quotes = await testContract.sampleBuysFromEth2Dai(TAKER_TOKEN, MAKER_TOKEN, []).callAsync();
+            expect(quotes).to.deep.eq([]);
+        });
+
+        it('can return many quotes', async () => {
+            const sampleAmounts = getSampleAmounts(MAKER_TOKEN);
+            const [expectedQuotes] = getDeterministicBuyQuotes(TAKER_TOKEN, MAKER_TOKEN, ['Eth2Dai'], sampleAmounts);
+            const quotes = await testContract
+                .sampleBuysFromEth2Dai(TAKER_TOKEN, MAKER_TOKEN, sampleAmounts)
+                .callAsync();
+            expect(quotes).to.deep.eq(expectedQuotes);
+        });
+
+        it('can quote token -> ETH', async () => {
+            const sampleAmounts = getSampleAmounts(MAKER_TOKEN);
+            const [expectedQuotes] = getDeterministicBuyQuotes(TAKER_TOKEN, WETH_ADDRESS, ['Eth2Dai'], sampleAmounts);
+            const quotes = await testContract
+                .sampleBuysFromEth2Dai(TAKER_TOKEN, WETH_ADDRESS, sampleAmounts)
+                .callAsync();
+            expect(quotes).to.deep.eq(expectedQuotes);
+        });
+
+        it('can quote ETH -> token', async () => {
+            const sampleAmounts = getSampleAmounts(MAKER_TOKEN);
+            const [expectedQuotes] = getDeterministicBuyQuotes(WETH_ADDRESS, TAKER_TOKEN, ['Eth2Dai'], sampleAmounts);
+            const quotes = await testContract
+                .sampleBuysFromEth2Dai(WETH_ADDRESS, TAKER_TOKEN, sampleAmounts)
+                .callAsync();
+            expect(quotes).to.deep.eq(expectedQuotes);
+        });
+    });
+
+    describe('sampleSellsFromUniswap()', () => {
+        const MAKER_TOKEN = randomAddress();
+        const TAKER_TOKEN = randomAddress();
+
+        before(async () => {
+            await testContract.createTokenExchanges([MAKER_TOKEN, TAKER_TOKEN]).awaitTransactionSuccessAsync();
+        });
+
+        it('throws if tokens are the same', async () => {
+            const tx = testContract.sampleSellsFromUniswap(MAKER_TOKEN, MAKER_TOKEN, []).callAsync();
+            return expect(tx).to.revertWith(INVALID_TOKEN_PAIR_ERROR);
+        });
+
+        it('can return no quotes', async () => {
+            const quotes = await testContract.sampleSellsFromUniswap(TAKER_TOKEN, MAKER_TOKEN, []).callAsync();
+            expect(quotes).to.deep.eq([]);
+        });
+
+        it('can return many quotes', async () => {
+            const sampleAmounts = getSampleAmounts(TAKER_TOKEN);
+            const [expectedQuotes] = getDeterministicSellQuotes(TAKER_TOKEN, MAKER_TOKEN, ['Uniswap'], sampleAmounts);
+            const quotes = await testContract
+                .sampleSellsFromUniswap(TAKER_TOKEN, MAKER_TOKEN, sampleAmounts)
+                .callAsync();
+            expect(quotes).to.deep.eq(expectedQuotes);
+        });
+
+        it('can quote token -> ETH', async () => {
+            const sampleAmounts = getSampleAmounts(TAKER_TOKEN);
+            const [expectedQuotes] = getDeterministicSellQuotes(TAKER_TOKEN, WETH_ADDRESS, ['Uniswap'], sampleAmounts);
+            const quotes = await testContract
+                .sampleSellsFromUniswap(TAKER_TOKEN, WETH_ADDRESS, sampleAmounts)
+                .callAsync();
+            expect(quotes).to.deep.eq(expectedQuotes);
+        });
+
+        it('can quote ETH -> token', async () => {
+            const sampleAmounts = getSampleAmounts(TAKER_TOKEN);
+            const [expectedQuotes] = getDeterministicSellQuotes(WETH_ADDRESS, TAKER_TOKEN, ['Uniswap'], sampleAmounts);
+            const quotes = await testContract
+                .sampleSellsFromUniswap(WETH_ADDRESS, TAKER_TOKEN, sampleAmounts)
+                .callAsync();
+            expect(quotes).to.deep.eq(expectedQuotes);
+        });
+
+        it('throws if no exchange exists for the maker token', async () => {
+            const nonExistantToken = randomAddress();
+            const tx = testContract
+                .sampleSellsFromUniswap(TAKER_TOKEN, nonExistantToken, getSampleAmounts(TAKER_TOKEN))
+                .callAsync();
+            return expect(tx).to.revertWith(UNSUPPORTED_UNISWAP_EXCHANGE_ERROR);
+        });
+
+        it('throws if no exchange exists for the taker token', async () => {
+            const nonExistantToken = randomAddress();
+            const tx = testContract
+                .sampleSellsFromUniswap(nonExistantToken, MAKER_TOKEN, getSampleAmounts(nonExistantToken))
+                .callAsync();
+            return expect(tx).to.revertWith(UNSUPPORTED_UNISWAP_EXCHANGE_ERROR);
+        });
+    });
+
+    describe('sampleBuysFromUniswap()', () => {
+        const MAKER_TOKEN = randomAddress();
+        const TAKER_TOKEN = randomAddress();
+
+        before(async () => {
+            await testContract.createTokenExchanges([MAKER_TOKEN, TAKER_TOKEN]).awaitTransactionSuccessAsync();
+        });
+
+        it('throws if tokens are the same', async () => {
+            const tx = testContract.sampleBuysFromUniswap(MAKER_TOKEN, MAKER_TOKEN, []).callAsync();
+            return expect(tx).to.revertWith(INVALID_TOKEN_PAIR_ERROR);
+        });
+
+        it('can return no quotes', async () => {
+            const quotes = await testContract.sampleBuysFromUniswap(TAKER_TOKEN, MAKER_TOKEN, []).callAsync();
+            expect(quotes).to.deep.eq([]);
+        });
+
+        it('can return many quotes', async () => {
+            const sampleAmounts = getSampleAmounts(MAKER_TOKEN);
+            const [expectedQuotes] = getDeterministicBuyQuotes(TAKER_TOKEN, MAKER_TOKEN, ['Uniswap'], sampleAmounts);
+            const quotes = await testContract
+                .sampleBuysFromUniswap(TAKER_TOKEN, MAKER_TOKEN, sampleAmounts)
+                .callAsync();
+            expect(quotes).to.deep.eq(expectedQuotes);
+        });
+
+        it('can quote token -> ETH', async () => {
+            const sampleAmounts = getSampleAmounts(MAKER_TOKEN);
+            const [expectedQuotes] = getDeterministicBuyQuotes(TAKER_TOKEN, WETH_ADDRESS, ['Uniswap'], sampleAmounts);
+            const quotes = await testContract
+                .sampleBuysFromUniswap(TAKER_TOKEN, WETH_ADDRESS, sampleAmounts)
+                .callAsync();
+            expect(quotes).to.deep.eq(expectedQuotes);
+        });
+
+        it('can quote ETH -> token', async () => {
+            const sampleAmounts = getSampleAmounts(MAKER_TOKEN);
+            const [expectedQuotes] = getDeterministicBuyQuotes(WETH_ADDRESS, TAKER_TOKEN, ['Uniswap'], sampleAmounts);
+            const quotes = await testContract
+                .sampleBuysFromUniswap(WETH_ADDRESS, TAKER_TOKEN, sampleAmounts)
+                .callAsync();
+            expect(quotes).to.deep.eq(expectedQuotes);
+        });
+
+        it('throws if no exchange exists for the maker token', async () => {
+            const nonExistantToken = randomAddress();
+            const tx = testContract
+                .sampleBuysFromUniswap(TAKER_TOKEN, nonExistantToken, getSampleAmounts(TAKER_TOKEN))
+                .callAsync();
+            return expect(tx).to.revertWith(UNSUPPORTED_UNISWAP_EXCHANGE_ERROR);
+        });
+
+        it('throws if no exchange exists for the taker token', async () => {
+            const nonExistantToken = randomAddress();
+            const tx = testContract
+                .sampleBuysFromUniswap(nonExistantToken, MAKER_TOKEN, getSampleAmounts(nonExistantToken))
+                .callAsync();
+            return expect(tx).to.revertWith(UNSUPPORTED_UNISWAP_EXCHANGE_ERROR);
+        });
+    });
+});

contracts/erc20-bridge-sampler/test/wrappers.ts

@@ -0,0 +1,12 @@
+/*
+ * -----------------------------------------------------------------------------
+ * Warning: This file is auto-generated by contracts-gen. Don't edit manually.
+ * -----------------------------------------------------------------------------
+ */
+export * from '../test/generated-wrappers/deployment_constants';
+export * from '../test/generated-wrappers/erc20_bridge_sampler';
+export * from '../test/generated-wrappers/i_erc20_bridge_sampler';
+export * from '../test/generated-wrappers/i_eth2_dai';
+export * from '../test/generated-wrappers/i_kyber_network';
+export * from '../test/generated-wrappers/i_uniswap_exchange_quotes';
+export * from '../test/generated-wrappers/test_erc20_bridge_sampler';

contracts/erc20-bridge-sampler/truffle-config.js

@@ -0,0 +1,96 @@
+/**
+ * Use this file to configure your truffle project. It's seeded with some
+ * common settings for different networks and features like migrations,
+ * compilation and testing. Uncomment the ones you need or modify
+ * them to suit your project as necessary.
+ *
+ * More information about configuration can be found at:
+ *
+ * truffleframework.com/docs/advanced/configuration
+ *
+ * To deploy via Infura you'll need a wallet provider (like truffle-hdwallet-provider)
+ * to sign your transactions before they're sent to a remote public node. Infura accounts
+ * are available for free at: infura.io/register.
+ *
+ * You'll also need a mnemonic - the twelve word phrase the wallet uses to generate
+ * public/private key pairs. If you're publishing your code to GitHub make sure you load this
+ * phrase from a file you've .gitignored so it doesn't accidentally become public.
+ *
+ */
+
+// const HDWalletProvider = require('truffle-hdwallet-provider');
+// const infuraKey = "fj4jll3k.....";
+//
+// const fs = require('fs');
+// const mnemonic = fs.readFileSync(".secret").toString().trim();
+
+module.exports = {
+    /**
+     * Networks define how you connect to your ethereum client and let you set the
+     * defaults web3 uses to send transactions. If you don't specify one truffle
+     * will spin up a development blockchain for you on port 9545 when you
+     * run `develop` or `test`. You can ask a truffle command to use a specific
+     * network from the command line, e.g
+     *
+     * $ truffle test --network <network-name>
+     */
+
+    networks: {
+        // Useful for testing. The `development` name is special - truffle uses it by default
+        // if it's defined here and no other network is specified at the command line.
+        // You should run a client (like ganache-cli, geth or parity) in a separate terminal
+        // tab if you use this network and you must also set the `host`, `port` and `network_id`
+        // options below to some value.
+        //
+        // development: {
+        //  host: "127.0.0.1",     // Localhost (default: none)
+        //  port: 8545,            // Standard Ethereum port (default: none)
+        //  network_id: "*",       // Any network (default: none)
+        // },
+        // Another network with more advanced options...
+        // advanced: {
+        // port: 8777,             // Custom port
+        // network_id: 1342,       // Custom network
+        // gas: 8500000,           // Gas sent with each transaction (default: ~6700000)
+        // gasPrice: 20000000000,  // 20 gwei (in wei) (default: 100 gwei)
+        // from: <address>,        // Account to send txs from (default: accounts[0])
+        // websockets: true        // Enable EventEmitter interface for web3 (default: false)
+        // },
+        // Useful for deploying to a public network.
+        // NB: It's important to wrap the provider as a function.
+        // ropsten: {
+        // provider: () => new HDWalletProvider(mnemonic, `https://ropsten.infura.io/v3/YOUR-PROJECT-ID`),
+        // network_id: 3,       // Ropsten's id
+        // gas: 5500000,        // Ropsten has a lower block limit than mainnet
+        // confirmations: 2,    // # of confs to wait between deployments. (default: 0)
+        // timeoutBlocks: 200,  // # of blocks before a deployment times out  (minimum/default: 50)
+        // skipDryRun: true     // Skip dry run before migrations? (default: false for public nets )
+        // },
+        // Useful for private networks
+        // private: {
+        // provider: () => new HDWalletProvider(mnemonic, `https://network.io`),
+        // network_id: 2111,   // This network is yours, in the cloud.
+        // production: true    // Treats this network as if it was a public net. (default: false)
+        // }
+    },
+
+    // Set default mocha options here, use special reporters etc.
+    mocha: {
+        // timeout: 100000
+    },
+
+    // Configure your compilers
+    compilers: {
+        solc: {
+            version: '0.5.9',
+            settings: {
+                evmVersion: 'constantinople',
+                optimizer: {
+                    enabled: true,
+                    runs: 1000000,
+                    details: { yul: true, deduplicate: true, cse: true, constantOptimizer: true },
+                },
+            },
+        },
+    },
+};

contracts/erc20-bridge-sampler/tsconfig.json

@@ -0,0 +1,17 @@
+{
+    "extends": "../../tsconfig",
+    "compilerOptions": { "outDir": "lib", "rootDir": ".", "resolveJsonModule": true },
+    "include": ["./src/**/*", "./test/**/*", "./generated-wrappers/**/*"],
+    "files": [
+        "generated-artifacts/ERC20BridgeSampler.json",
+        "generated-artifacts/IERC20BridgeSampler.json",
+        "test/generated-artifacts/DeploymentConstants.json",
+        "test/generated-artifacts/ERC20BridgeSampler.json",
+        "test/generated-artifacts/IERC20BridgeSampler.json",
+        "test/generated-artifacts/IEth2Dai.json",
+        "test/generated-artifacts/IKyberNetwork.json",
+        "test/generated-artifacts/IUniswapExchangeQuotes.json",
+        "test/generated-artifacts/TestERC20BridgeSampler.json"
+    ],
+    "exclude": ["./deploy/solc/solc_bin"]
+}

contracts/erc20-bridge-sampler/tslint.json

@@ -0,0 +1,10 @@
+{
+    "extends": ["@0x/tslint-config"],
+    "rules": {
+        "custom-no-magic-numbers": false,
+        "max-file-line-count": false
+    },
+    "linterOptions": {
+        "exclude": ["src/artifacts.ts", "test/artifacts.ts"]
+    }
+}

contracts/erc20/CHANGELOG.json

@@ -1,4 +1,35 @@
 [
+    {
+        "version": "3.0.0",
+        "changes": [
+            {
+                "note": "Drastically reduced bundle size by adding .npmignore, only exporting specific artifacts/wrappers/utils",
+                "pr": 2330
+            },
+            {
+                "note": "Add `decimals()` to `LibERC20Token`.",
+                "pr": 2344
+            },
+            {
+                "note": "Create `LibERC20Token`",
+                "pr": 2309
+            },
+            {
+                "note": "Replaced `SafeMath` with `LibSafeMath`",
+                "pr": 2254
+            }
+        ],
+        "timestamp": 1575296764
+    },
+    {
+        "version": "2.3.0-beta.4",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ],
+        "timestamp": 1575290197
+    },
     {
         "version": "2.3.0-beta.3",
         "changes": [
@@ -14,6 +45,10 @@
             {
                 "note": "Drastically reduced bundle size by adding .npmignore, only exporting specific artifacts/wrappers/utils",
                 "pr": 2330
+            },
+            {
+                "note": "Add `decimals()` to `LibERC20Token`.",
+                "pr": 2344
             }
         ],
         "timestamp": 1574030254

contracts/erc20/CHANGELOG.md

@@ -5,6 +5,17 @@ Edit the package's CHANGELOG.json file only.
 
 CHANGELOG
 
+## v3.0.0 - _December 2, 2019_
+
+    * Drastically reduced bundle size by adding .npmignore, only exporting specific artifacts/wrappers/utils (#2330)
+    * Add `decimals()` to `LibERC20Token`. (#2344)
+    * Create `LibERC20Token` (#2309)
+    * Replaced `SafeMath` with `LibSafeMath` (#2254)
+
+## v2.3.0-beta.4 - _December 2, 2019_
+
+    * Dependencies updated
+
 ## v2.3.0-beta.3 - _November 20, 2019_
 
     * Dependencies updated
@@ -12,6 +23,7 @@ CHANGELOG
 ## v2.3.0-beta.2 - _November 17, 2019_
 
     * Drastically reduced bundle size by adding .npmignore, only exporting specific artifacts/wrappers/utils (#2330)
+    * Add `decimals()` to `LibERC20Token`. (#2344)
 
 ## v2.3.0-beta.1 - _November 7, 2019_
 

contracts/erc20/contracts/src/LibERC20Token.sol

@@ -24,6 +24,7 @@ import "../src/interfaces/IERC20Token.sol";
 
 
 library LibERC20Token {
+    bytes constant private DECIMALS_CALL_DATA = hex"313ce567";
 
     /// @dev Calls `IERC20Token(token).approve()`.
     ///      Reverts if `false` is returned or if the return
@@ -91,6 +92,21 @@ library LibERC20Token {
         _callWithOptionalBooleanResult(token, callData);
     }
 
+    /// @dev Retrieves the number of decimals for a token.
+    ///      Returns `18` if the call reverts.
+    /// @return The number of decimals places for the token.
+    function decimals(address token)
+        internal
+        view
+        returns (uint8 tokenDecimals)
+    {
+        tokenDecimals = 18;
+        (bool didSucceed, bytes memory resultData) = token.staticcall(DECIMALS_CALL_DATA);
+        if (didSucceed && resultData.length == 32) {
+            tokenDecimals = uint8(LibBytes.readUint256(resultData, 0));
+        }
+    }
+
     /// @dev Executes a call on address `target` with calldata `callData`
     ///      and asserts that either nothing was returned or a single boolean
     ///      was returned equal to `true`.

contracts/erc20/contracts/test/TestLibERC20Token.sol

@@ -69,4 +69,16 @@ contract TestLibERC20Token {
         target.setBehavior(shouldRevert, revertData, returnData);
         LibERC20Token.transferFrom(address(target), from, to, amount);
     }
+
+    function testDecimals(
+        bool shouldRevert,
+        bytes calldata revertData,
+        bytes calldata returnData
+    )
+        external
+        returns (uint8)
+    {
+        target.setBehavior(shouldRevert, revertData, returnData);
+        return LibERC20Token.decimals(address(target));
+    }
 }

contracts/erc20/contracts/test/TestLibERC20TokenTarget.sol

@@ -87,6 +87,14 @@ contract TestLibERC20TokenTarget {
         _execute();
     }
 
+    function decimals()
+        external
+        view
+        returns (uint8)
+    {
+        _execute();
+    }
+
     function _execute() private view {
         if (_shouldRevert) {
             bytes memory revertData = _revertData;

contracts/erc20/package.json

@@ -1,6 +1,6 @@
 {
     "name": "@0x/contracts-erc20",
-    "version": "2.3.0-beta.3",
+    "version": "3.0.0",
     "engines": {
         "node": ">=6.12"
     },
@@ -51,16 +51,18 @@
     },
     "homepage": "https://github.com/0xProject/0x-monorepo/contracts/tokens/README.md",
     "devDependencies": {
-        "@0x/abi-gen": "^4.4.0-beta.3",
-        "@0x/contracts-gen": "^1.1.0-beta.3",
-        "@0x/contracts-test-utils": "^3.2.0-beta.3",
-        "@0x/contracts-utils": "^3.3.0-beta.3",
-        "@0x/dev-utils": "^2.4.0-beta.3",
-        "@0x/sol-compiler": "^3.2.0-beta.3",
+        "@0x/abi-gen": "^5.0.0",
+        "@0x/contracts-gen": "^2.0.0",
+        "@0x/contracts-test-utils": "^4.0.0",
+        "@0x/contracts-utils": "^4.0.0",
+        "@0x/dev-utils": "^3.0.0",
+        "@0x/sol-compiler": "^4.0.0",
         "@0x/ts-doc-gen": "^0.0.22",
-        "@0x/tslint-config": "^3.1.0-beta.2",
-        "@0x/utils": "^4.6.0-beta.2",
-        "@0x/web3-wrapper": "^6.1.0-beta.2",
+        "@0x/tslint-config": "^4.0.0",
+        "@0x/types": "^3.0.0",
+        "@0x/typescript-typings": "^5.0.0",
+        "@0x/utils": "^5.0.0",
+        "@0x/web3-wrapper": "^7.0.0",
         "@types/lodash": "4.14.104",
         "@types/mocha": "^5.2.7",
         "@types/node": "*",
@@ -68,6 +70,7 @@
         "chai-as-promised": "^7.1.0",
         "chai-bignumber": "^3.0.0",
         "dirty-chai": "^2.0.1",
+        "ethereum-types": "^3.0.0",
         "lodash": "^4.17.11",
         "make-promises-safe": "^1.1.0",
         "mocha": "^6.2.0",
@@ -79,10 +82,7 @@
         "typescript": "3.0.1"
     },
     "dependencies": {
-        "@0x/base-contract": "^5.5.0-beta.3",
-        "@0x/types": "^2.5.0-beta.2",
-        "@0x/typescript-typings": "^4.4.0-beta.2",
-        "ethereum-types": "^2.2.0-beta.2"
+        "@0x/base-contract": "^6.0.0"
     },
     "publishConfig": {
         "access": "public"

contracts/erc20/test/lib_erc20_token.ts

@@ -16,6 +16,7 @@ import { artifacts } from './artifacts';
 blockchainTests('LibERC20Token', env => {
     let testContract: TestLibERC20TokenContract;
     const REVERT_STRING = 'WHOOPSIE';
+    const ENCODED_REVERT = new StringRevertError(REVERT_STRING).encode();
     const ENCODED_TRUE = hexLeftPad(1);
     const ENCODED_FALSE = hexLeftPad(0);
     const ENCODED_TWO = hexLeftPad(2);
@@ -31,16 +32,12 @@ blockchainTests('LibERC20Token', env => {
         );
     });
 
-    function encodeRevert(message: string): string {
-        return new StringRevertError(message).encode();
-    }
-
     describe('approve()', () => {
         it('calls the target with the correct arguments', async () => {
             const spender = randomAddress();
             const allowance = getRandomInteger(0, 100e18);
             const { logs } = await testContract
-                .testApprove(false, encodeRevert(REVERT_STRING), ENCODED_TRUE, spender, allowance)
+                .testApprove(false, ENCODED_REVERT, ENCODED_TRUE, spender, allowance)
                 .awaitTransactionSuccessAsync();
             expect(logs).to.be.length(1);
             verifyEventsFromLogs(logs, [{ spender, allowance }], TestLibERC20TokenTargetEvents.ApproveCalled);
@@ -50,7 +47,7 @@ blockchainTests('LibERC20Token', env => {
             const spender = randomAddress();
             const allowance = getRandomInteger(0, 100e18);
             await testContract
-                .testApprove(false, encodeRevert(REVERT_STRING), ENCODED_TRUE, spender, allowance)
+                .testApprove(false, ENCODED_REVERT, ENCODED_TRUE, spender, allowance)
                 .awaitTransactionSuccessAsync();
         });
 
@@ -58,7 +55,7 @@ blockchainTests('LibERC20Token', env => {
             const spender = randomAddress();
             const allowance = getRandomInteger(0, 100e18);
             await testContract
-                .testApprove(false, encodeRevert(REVERT_STRING), constants.NULL_BYTES, spender, allowance)
+                .testApprove(false, ENCODED_REVERT, constants.NULL_BYTES, spender, allowance)
                 .awaitTransactionSuccessAsync();
         });
 
@@ -66,7 +63,7 @@ blockchainTests('LibERC20Token', env => {
             const spender = randomAddress();
             const allowance = getRandomInteger(0, 100e18);
             const tx = testContract
-                .testApprove(false, encodeRevert(REVERT_STRING), ENCODED_FALSE, spender, allowance)
+                .testApprove(false, ENCODED_REVERT, ENCODED_FALSE, spender, allowance)
                 .awaitTransactionSuccessAsync();
             const expectedError = new RawRevertError(ENCODED_FALSE);
             return expect(tx).to.revertWith(expectedError);
@@ -76,7 +73,7 @@ blockchainTests('LibERC20Token', env => {
             const spender = randomAddress();
             const allowance = getRandomInteger(0, 100e18);
             const tx = testContract
-                .testApprove(false, encodeRevert(REVERT_STRING), ENCODED_TWO, spender, allowance)
+                .testApprove(false, ENCODED_REVERT, ENCODED_TWO, spender, allowance)
                 .awaitTransactionSuccessAsync();
             const expectedError = new RawRevertError(ENCODED_TWO);
             return expect(tx).to.revertWith(expectedError);
@@ -86,7 +83,7 @@ blockchainTests('LibERC20Token', env => {
             const spender = randomAddress();
             const allowance = getRandomInteger(0, 100e18);
             const tx = testContract
-                .testApprove(false, encodeRevert(REVERT_STRING), ENCODED_SHORT_TRUE, spender, allowance)
+                .testApprove(false, ENCODED_REVERT, ENCODED_SHORT_TRUE, spender, allowance)
                 .awaitTransactionSuccessAsync();
             const expectedError = new RawRevertError(ENCODED_SHORT_TRUE);
             return expect(tx).to.revertWith(expectedError);
@@ -96,7 +93,7 @@ blockchainTests('LibERC20Token', env => {
             const spender = randomAddress();
             const allowance = getRandomInteger(0, 100e18);
             const tx = testContract
-                .testApprove(false, encodeRevert(REVERT_STRING), ENCODED_LONG_TRUE, spender, allowance)
+                .testApprove(false, ENCODED_REVERT, ENCODED_LONG_TRUE, spender, allowance)
                 .awaitTransactionSuccessAsync();
             const expectedError = new RawRevertError(ENCODED_LONG_TRUE);
             return expect(tx).to.revertWith(expectedError);
@@ -106,7 +103,7 @@ blockchainTests('LibERC20Token', env => {
             const spender = randomAddress();
             const allowance = getRandomInteger(0, 100e18);
             const tx = testContract
-                .testApprove(true, encodeRevert(REVERT_STRING), ENCODED_TRUE, spender, allowance)
+                .testApprove(true, ENCODED_REVERT, ENCODED_TRUE, spender, allowance)
                 .awaitTransactionSuccessAsync();
             return expect(tx).to.revertWith(REVERT_STRING);
         });
@@ -126,7 +123,7 @@ blockchainTests('LibERC20Token', env => {
             const to = randomAddress();
             const amount = getRandomInteger(0, 100e18);
             const { logs } = await testContract
-                .testTransfer(false, encodeRevert(REVERT_STRING), ENCODED_TRUE, to, amount)
+                .testTransfer(false, ENCODED_REVERT, ENCODED_TRUE, to, amount)
                 .awaitTransactionSuccessAsync();
             expect(logs).to.be.length(1);
             verifyEventsFromLogs(logs, [{ to, amount }], TestLibERC20TokenTargetEvents.TransferCalled);
@@ -136,7 +133,7 @@ blockchainTests('LibERC20Token', env => {
             const to = randomAddress();
             const amount = getRandomInteger(0, 100e18);
             await testContract
-                .testTransfer(false, encodeRevert(REVERT_STRING), ENCODED_TRUE, to, amount)
+                .testTransfer(false, ENCODED_REVERT, ENCODED_TRUE, to, amount)
                 .awaitTransactionSuccessAsync();
         });
 
@@ -144,7 +141,7 @@ blockchainTests('LibERC20Token', env => {
             const to = randomAddress();
             const amount = getRandomInteger(0, 100e18);
             await testContract
-                .testTransfer(false, encodeRevert(REVERT_STRING), constants.NULL_BYTES, to, amount)
+                .testTransfer(false, ENCODED_REVERT, constants.NULL_BYTES, to, amount)
                 .awaitTransactionSuccessAsync();
         });
 
@@ -152,7 +149,7 @@ blockchainTests('LibERC20Token', env => {
             const to = randomAddress();
             const amount = getRandomInteger(0, 100e18);
             const tx = testContract
-                .testTransfer(false, encodeRevert(REVERT_STRING), ENCODED_FALSE, to, amount)
+                .testTransfer(false, ENCODED_REVERT, ENCODED_FALSE, to, amount)
                 .awaitTransactionSuccessAsync();
             const expectedError = new RawRevertError(ENCODED_FALSE);
             return expect(tx).to.revertWith(expectedError);
@@ -162,7 +159,7 @@ blockchainTests('LibERC20Token', env => {
             const to = randomAddress();
             const amount = getRandomInteger(0, 100e18);
             const tx = testContract
-                .testTransfer(false, encodeRevert(REVERT_STRING), ENCODED_TWO, to, amount)
+                .testTransfer(false, ENCODED_REVERT, ENCODED_TWO, to, amount)
                 .awaitTransactionSuccessAsync();
             const expectedError = new RawRevertError(ENCODED_TWO);
             return expect(tx).to.revertWith(expectedError);
@@ -172,7 +169,7 @@ blockchainTests('LibERC20Token', env => {
             const to = randomAddress();
             const amount = getRandomInteger(0, 100e18);
             const tx = testContract
-                .testTransfer(false, encodeRevert(REVERT_STRING), ENCODED_SHORT_TRUE, to, amount)
+                .testTransfer(false, ENCODED_REVERT, ENCODED_SHORT_TRUE, to, amount)
                 .awaitTransactionSuccessAsync();
             const expectedError = new RawRevertError(ENCODED_SHORT_TRUE);
             return expect(tx).to.revertWith(expectedError);
@@ -182,7 +179,7 @@ blockchainTests('LibERC20Token', env => {
             const to = randomAddress();
             const amount = getRandomInteger(0, 100e18);
             const tx = testContract
-                .testTransfer(false, encodeRevert(REVERT_STRING), ENCODED_LONG_TRUE, to, amount)
+                .testTransfer(false, ENCODED_REVERT, ENCODED_LONG_TRUE, to, amount)
                 .awaitTransactionSuccessAsync();
             const expectedError = new RawRevertError(ENCODED_LONG_TRUE);
             return expect(tx).to.revertWith(expectedError);
@@ -192,7 +189,7 @@ blockchainTests('LibERC20Token', env => {
             const to = randomAddress();
             const amount = getRandomInteger(0, 100e18);
             const tx = testContract
-                .testTransfer(true, encodeRevert(REVERT_STRING), ENCODED_TRUE, to, amount)
+                .testTransfer(true, ENCODED_REVERT, ENCODED_TRUE, to, amount)
                 .awaitTransactionSuccessAsync();
             return expect(tx).to.revertWith(REVERT_STRING);
         });
@@ -213,7 +210,7 @@ blockchainTests('LibERC20Token', env => {
             const to = randomAddress();
             const amount = getRandomInteger(0, 100e18);
             const { logs } = await testContract
-                .testTransferFrom(false, encodeRevert(REVERT_STRING), ENCODED_TRUE, owner, to, amount)
+                .testTransferFrom(false, ENCODED_REVERT, ENCODED_TRUE, owner, to, amount)
                 .awaitTransactionSuccessAsync();
             expect(logs).to.be.length(1);
             verifyEventsFromLogs(logs, [{ from: owner, to, amount }], TestLibERC20TokenTargetEvents.TransferFromCalled);
@@ -224,7 +221,7 @@ blockchainTests('LibERC20Token', env => {
             const to = randomAddress();
             const amount = getRandomInteger(0, 100e18);
             await testContract
-                .testTransferFrom(false, encodeRevert(REVERT_STRING), ENCODED_TRUE, owner, to, amount)
+                .testTransferFrom(false, ENCODED_REVERT, ENCODED_TRUE, owner, to, amount)
                 .awaitTransactionSuccessAsync();
         });
 
@@ -233,7 +230,7 @@ blockchainTests('LibERC20Token', env => {
             const to = randomAddress();
             const amount = getRandomInteger(0, 100e18);
             await testContract
-                .testTransferFrom(false, encodeRevert(REVERT_STRING), constants.NULL_BYTES, owner, to, amount)
+                .testTransferFrom(false, ENCODED_REVERT, constants.NULL_BYTES, owner, to, amount)
                 .awaitTransactionSuccessAsync();
         });
 
@@ -242,7 +239,7 @@ blockchainTests('LibERC20Token', env => {
             const to = randomAddress();
             const amount = getRandomInteger(0, 100e18);
             const tx = testContract
-                .testTransferFrom(false, encodeRevert(REVERT_STRING), ENCODED_FALSE, owner, to, amount)
+                .testTransferFrom(false, ENCODED_REVERT, ENCODED_FALSE, owner, to, amount)
                 .awaitTransactionSuccessAsync();
             const expectedError = new RawRevertError(ENCODED_FALSE);
             return expect(tx).to.revertWith(expectedError);
@@ -253,7 +250,7 @@ blockchainTests('LibERC20Token', env => {
             const to = randomAddress();
             const amount = getRandomInteger(0, 100e18);
             const tx = testContract
-                .testTransferFrom(false, encodeRevert(REVERT_STRING), ENCODED_TWO, owner, to, amount)
+                .testTransferFrom(false, ENCODED_REVERT, ENCODED_TWO, owner, to, amount)
                 .awaitTransactionSuccessAsync();
             const expectedError = new RawRevertError(ENCODED_TWO);
             return expect(tx).to.revertWith(expectedError);
@@ -264,7 +261,7 @@ blockchainTests('LibERC20Token', env => {
             const to = randomAddress();
             const amount = getRandomInteger(0, 100e18);
             const tx = testContract
-                .testTransferFrom(false, encodeRevert(REVERT_STRING), ENCODED_SHORT_TRUE, owner, to, amount)
+                .testTransferFrom(false, ENCODED_REVERT, ENCODED_SHORT_TRUE, owner, to, amount)
                 .awaitTransactionSuccessAsync();
             const expectedError = new RawRevertError(ENCODED_SHORT_TRUE);
             return expect(tx).to.revertWith(expectedError);
@@ -275,7 +272,7 @@ blockchainTests('LibERC20Token', env => {
             const to = randomAddress();
             const amount = getRandomInteger(0, 100e18);
             const tx = testContract
-                .testTransferFrom(false, encodeRevert(REVERT_STRING), ENCODED_LONG_TRUE, owner, to, amount)
+                .testTransferFrom(false, ENCODED_REVERT, ENCODED_LONG_TRUE, owner, to, amount)
                 .awaitTransactionSuccessAsync();
             const expectedError = new RawRevertError(ENCODED_LONG_TRUE);
             return expect(tx).to.revertWith(expectedError);
@@ -286,7 +283,7 @@ blockchainTests('LibERC20Token', env => {
             const to = randomAddress();
             const amount = getRandomInteger(0, 100e18);
             const tx = testContract
-                .testTransferFrom(true, encodeRevert(REVERT_STRING), ENCODED_TRUE, owner, to, amount)
+                .testTransferFrom(true, ENCODED_REVERT, ENCODED_TRUE, owner, to, amount)
                 .awaitTransactionSuccessAsync();
             return expect(tx).to.revertWith(REVERT_STRING);
         });
@@ -301,4 +298,39 @@ blockchainTests('LibERC20Token', env => {
             return expect(tx).to.be.rejectedWith('revert');
         });
     });
+
+    describe('decimals()', () => {
+        const DEFAULT_DECIMALS = 18;
+        const ENCODED_ZERO = hexLeftPad(0);
+        const ENCODED_SHORT_ZERO = hexLeftPad(0, 31);
+        const ENCODED_LONG_ZERO = hexLeftPad(0, 33);
+        const randomDecimals = () => Math.floor(Math.random() * 256) + 1;
+
+        it('returns the number of decimals defined by the token', async () => {
+            const decimals = randomDecimals();
+            const encodedDecimals = hexLeftPad(decimals);
+            const result = await testContract.testDecimals(false, ENCODED_REVERT, encodedDecimals).callAsync();
+            return expect(result).to.bignumber.eq(decimals);
+        });
+
+        it('returns 0 if the token returns 0', async () => {
+            const result = await testContract.testDecimals(false, ENCODED_REVERT, ENCODED_ZERO).callAsync();
+            return expect(result).to.bignumber.eq(0);
+        });
+
+        it('returns 18 if the token returns less than 32 bytes', async () => {
+            const result = await testContract.testDecimals(false, ENCODED_REVERT, ENCODED_SHORT_ZERO).callAsync();
+            return expect(result).to.bignumber.eq(DEFAULT_DECIMALS);
+        });
+
+        it('returns 18 if the token returns greater than 32 bytes', async () => {
+            const result = await testContract.testDecimals(false, ENCODED_REVERT, ENCODED_LONG_ZERO).callAsync();
+            return expect(result).to.bignumber.eq(DEFAULT_DECIMALS);
+        });
+
+        it('returns 18 if the token reverts', async () => {
+            const result = await testContract.testDecimals(true, ENCODED_REVERT, ENCODED_ZERO).callAsync();
+            return expect(result).to.bignumber.eq(DEFAULT_DECIMALS);
+        });
+    });
 });

contracts/erc721/CHANGELOG.json

@@ -1,4 +1,27 @@
 [
+    {
+        "version": "3.0.0",
+        "changes": [
+            {
+                "note": "Drastically reduced bundle size by adding .npmignore, only exporting specific artifacts/wrappers/utils",
+                "pr": 2330
+            },
+            {
+                "note": "Replaced `SafeMath` with `LibSafeMath`",
+                "pr": 2254
+            }
+        ],
+        "timestamp": 1575296764
+    },
+    {
+        "version": "2.2.0-beta.4",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ],
+        "timestamp": 1575290197
+    },
     {
         "version": "2.2.0-beta.3",
         "changes": [

contracts/erc721/CHANGELOG.md

@@ -5,6 +5,15 @@ Edit the package's CHANGELOG.json file only.
 
 CHANGELOG
 
+## v3.0.0 - _December 2, 2019_
+
+    * Drastically reduced bundle size by adding .npmignore, only exporting specific artifacts/wrappers/utils (#2330)
+    * Replaced `SafeMath` with `LibSafeMath` (#2254)
+
+## v2.2.0-beta.4 - _December 2, 2019_
+
+    * Dependencies updated
+
 ## v2.2.0-beta.3 - _November 20, 2019_
 
     * Dependencies updated

contracts/erc721/package.json

@@ -1,6 +1,6 @@
 {
     "name": "@0x/contracts-erc721",
-    "version": "2.2.0-beta.3",
+    "version": "3.0.0",
     "engines": {
         "node": ">=6.12"
     },
@@ -52,17 +52,18 @@
     },
     "homepage": "https://github.com/0xProject/0x-monorepo/contracts/tokens/README.md",
     "devDependencies": {
-        "@0x/abi-gen": "^4.4.0-beta.3",
-        "@0x/contracts-gen": "^1.1.0-beta.3",
-        "@0x/contracts-test-utils": "^3.2.0-beta.3",
-        "@0x/contracts-utils": "^3.3.0-beta.3",
-        "@0x/dev-utils": "^2.4.0-beta.3",
-        "@0x/sol-compiler": "^3.2.0-beta.3",
+        "@0x/abi-gen": "^5.0.0",
+        "@0x/contracts-gen": "^2.0.0",
+        "@0x/contracts-test-utils": "^4.0.0",
+        "@0x/contracts-utils": "^4.0.0",
+        "@0x/dev-utils": "^3.0.0",
+        "@0x/sol-compiler": "^4.0.0",
         "@0x/ts-doc-gen": "^0.0.22",
-        "@0x/tslint-config": "^3.1.0-beta.2",
-        "@0x/types": "^2.5.0-beta.2",
-        "@0x/utils": "^4.6.0-beta.2",
-        "@0x/web3-wrapper": "^6.1.0-beta.2",
+        "@0x/tslint-config": "^4.0.0",
+        "@0x/types": "^3.0.0",
+        "@0x/typescript-typings": "^5.0.0",
+        "@0x/utils": "^5.0.0",
+        "@0x/web3-wrapper": "^7.0.0",
         "@types/lodash": "4.14.104",
         "@types/mocha": "^5.2.7",
         "@types/node": "*",
@@ -70,6 +71,7 @@
         "chai-as-promised": "^7.1.0",
         "chai-bignumber": "^3.0.0",
         "dirty-chai": "^2.0.1",
+        "ethereum-types": "^3.0.0",
         "lodash": "^4.17.11",
         "make-promises-safe": "^1.1.0",
         "mocha": "^6.2.0",
@@ -82,9 +84,7 @@
         "typescript": "3.0.1"
     },
     "dependencies": {
-        "@0x/base-contract": "^5.5.0-beta.3",
-        "@0x/typescript-typings": "^4.4.0-beta.2",
-        "ethereum-types": "^2.2.0-beta.2"
+        "@0x/base-contract": "^6.0.0"
     },
     "publishConfig": {
         "access": "public"

contracts/erc721/src/index.ts

@@ -2,6 +2,8 @@ export {
     DummyERC721ReceiverContract,
     DummyERC721TokenContract,
     ERC721TokenContract,
+    ERC721TokenEvents,
+    ERC721TokenTransferEventArgs,
     IERC721ReceiverContract,
 } from './wrappers';
 export { artifacts } from './artifacts';

contracts/exchange-forwarder/CHANGELOG.json

@@ -1,4 +1,36 @@
 [
+    {
+        "version": "4.0.0",
+        "changes": [
+            {
+                "note": "Added buy support for ERC20Bridge",
+                "pr": 2356
+            },
+            {
+                "note": "Drastically reduced bundle size by adding .npmignore, only exporting specific artifacts/wrappers/utils",
+                "pr": 2330
+            },
+            {
+                "note": "Introduced new export ForwarderRevertErrors",
+                "pr": 2321
+            },
+            {
+                "note": "Use `LibERC20Token` in `MixinAssets`",
+                "pr": 2309
+            }
+        ],
+        "timestamp": 1575296764
+    },
+    {
+        "version": "3.1.0-beta.4",
+        "changes": [
+            {
+                "note": "Added buy support for ERC20Bridge",
+                "pr": 2356
+            }
+        ],
+        "timestamp": 1575290197
+    },
     {
         "version": "3.1.0-beta.3",
         "changes": [

contracts/exchange-forwarder/CHANGELOG.md

@@ -5,6 +5,17 @@ Edit the package's CHANGELOG.json file only.
 
 CHANGELOG
 
+## v4.0.0 - _December 2, 2019_
+
+    * Added buy support for ERC20Bridge (#2356)
+    * Drastically reduced bundle size by adding .npmignore, only exporting specific artifacts/wrappers/utils (#2330)
+    * Introduced new export ForwarderRevertErrors (#2321)
+    * Use `LibERC20Token` in `MixinAssets` (#2309)
+
+## v3.1.0-beta.4 - _December 2, 2019_
+
+    * Added buy support for ERC20Bridge (#2356)
+
 ## v3.1.0-beta.3 - _November 20, 2019_
 
     * Dependencies updated

contracts/exchange-forwarder/contracts/src/Forwarder.sol

@@ -32,13 +32,13 @@ contract Forwarder is
 {
     constructor (
         address _exchange,
-        bytes memory _wethAssetData
+        address _weth
     )
         public
         Ownable()
         LibConstants(
             _exchange,
-            _wethAssetData
+            _weth
         )
         MixinForwarderCore()
     {}

contracts/exchange-forwarder/contracts/src/MixinAssets.sol

@@ -21,9 +21,9 @@ pragma solidity ^0.5.9;
 import "@0x/contracts-utils/contracts/src/LibBytes.sol";
 import "@0x/contracts-utils/contracts/src/LibRichErrors.sol";
 import "@0x/contracts-utils/contracts/src/Ownable.sol";
-import "@0x/contracts-erc20/contracts/src/interfaces/IERC20Token.sol";
 import "@0x/contracts-erc20/contracts/src/LibERC20Token.sol";
 import "@0x/contracts-erc721/contracts/src/interfaces/IERC721Token.sol";
+import "@0x/contracts-asset-proxy/contracts/src/interfaces/IAssetData.sol";
 import "./libs/LibConstants.sol";
 import "./libs/LibForwarderRichErrors.sol";
 import "./interfaces/IAssets.sol";
@@ -36,13 +36,10 @@ contract MixinAssets is
 {
     using LibBytes for bytes;
 
-    bytes4 constant internal ERC20_TRANSFER_SELECTOR = bytes4(keccak256("transfer(address,uint256)"));
-
-    /// @dev Withdraws assets from this contract. The contract formerly required a ZRX balance in order
-    ///      to function optimally, and this function allows the ZRX to be withdrawn by owner.
-    ///      It may also be used to withdraw assets that were accidentally sent to this contract.
+    /// @dev Withdraws assets from this contract. It may be used by the owner to withdraw assets
+    ///      that were accidentally sent to this contract.
     /// @param assetData Byte array encoded for the respective asset proxy.
-    /// @param amount Amount of ERC20 token to withdraw.
+    /// @param amount Amount of the asset to withdraw.
     function withdrawAsset(
         bytes calldata assetData,
         uint256 amount
@@ -63,14 +60,16 @@ contract MixinAssets is
         external
     {
         bytes4 proxyId = assetData.readBytes4(0);
+        bytes4 erc20ProxyId = IAssetData(address(0)).ERC20Token.selector;
+
         // For now we only care about ERC20, since percentage fees on ERC721 tokens are invalid.
-        if (proxyId == ERC20_DATA_ID) {
-            address proxyAddress = EXCHANGE.getAssetProxy(ERC20_DATA_ID);
+        if (proxyId == erc20ProxyId) {
+            address proxyAddress = EXCHANGE.getAssetProxy(erc20ProxyId);
             if (proxyAddress == address(0)) {
                 LibRichErrors.rrevert(LibForwarderRichErrors.UnregisteredAssetProxyError());
             }
-            IERC20Token assetToken = IERC20Token(assetData.readAddress(16));
-            assetToken.approve(proxyAddress, MAX_UINT);
+            address token = assetData.readAddress(16);
+            LibERC20Token.approve(token, proxyAddress, MAX_UINT);
         }
     }
 
@@ -85,9 +84,12 @@ contract MixinAssets is
     {
         bytes4 proxyId = assetData.readBytes4(0);
 
-        if (proxyId == ERC20_DATA_ID) {
+        if (
+            proxyId == IAssetData(address(0)).ERC20Token.selector ||
+            proxyId == IAssetData(address(0)).ERC20Bridge.selector
+        ) {
             _transferERC20Token(assetData, amount);
-        } else if (proxyId == ERC721_DATA_ID) {
+        } else if (proxyId == IAssetData(address(0)).ERC721Token.selector) {
             _transferERC721Token(assetData, amount);
         } else {
             LibRichErrors.rrevert(LibForwarderRichErrors.UnsupportedAssetProxyError(
@@ -96,7 +98,7 @@ contract MixinAssets is
         }
     }
 
-    /// @dev Decodes ERC20 assetData and transfers given amount to sender.
+    /// @dev Decodes ERC20 or ERC20Bridge assetData and transfers given amount to sender.
     /// @param assetData Byte array encoded for the respective asset proxy.
     /// @param amount Amount of asset to transfer to sender.
     function _transferERC20Token(

contracts/exchange-forwarder/contracts/src/MixinExchangeWrapper.sol

@@ -19,12 +19,15 @@
 pragma solidity ^0.5.9;
 pragma experimental ABIEncoderV2;
 
+import "@0x/contracts-utils/contracts/src/LibBytes.sol";
 import "@0x/contracts-utils/contracts/src/LibRichErrors.sol";
 import "@0x/contracts-utils/contracts/src/LibSafeMath.sol";
 import "@0x/contracts-exchange-libs/contracts/src/LibOrder.sol";
 import "@0x/contracts-exchange-libs/contracts/src/LibFillResults.sol";
 import "@0x/contracts-exchange-libs/contracts/src/LibMath.sol";
 import "@0x/contracts-exchange/contracts/src/interfaces/IExchange.sol";
+import "@0x/contracts-asset-proxy/contracts/src/interfaces/IAssetData.sol";
+import "@0x/contracts-erc20/contracts/src/interfaces/IERC20Token.sol";
 import "./libs/LibConstants.sol";
 import "./libs/LibForwarderRichErrors.sol";
 import "./MixinAssets.sol";
@@ -34,6 +37,7 @@ contract MixinExchangeWrapper is
     LibConstants,
     MixinAssets
 {
+    using LibBytes for bytes;
     using LibSafeMath for uint256;
 
     /// @dev Fills the input order.
@@ -88,7 +92,10 @@ contract MixinExchangeWrapper is
         )
     {
         // No taker fee or percentage fee
-        if (order.takerFee == 0 || order.takerFeeAssetData.equals(order.makerAssetData)) {
+        if (
+            order.takerFee == 0 ||
+            _areUnderlyingAssetsEqual(order.takerFeeAssetData, order.makerAssetData)
+        ) {
             // Attempt to sell the remaining amount of WETH
             LibFillResults.FillResults memory singleFillResults = _fillOrderNoThrow(
                 order,
@@ -103,7 +110,7 @@ contract MixinExchangeWrapper is
             makerAssetAcquiredAmount = singleFillResults.makerAssetFilledAmount
                 .safeSub(singleFillResults.takerFeePaid);
         // WETH fee
-        } else if (order.takerFeeAssetData.equals(order.takerAssetData)) {
+        } else if (_areUnderlyingAssetsEqual(order.takerFeeAssetData, order.takerAssetData)) {
 
             // We will first sell WETH as the takerAsset, then use it to pay the takerFee.
             // This ensures that we reserve enough to pay the taker and protocol fees.
@@ -150,9 +157,10 @@ contract MixinExchangeWrapper is
             uint256 totalMakerAssetAcquiredAmount
         )
     {
-        uint256 ordersLength = orders.length;
         uint256 protocolFee = tx.gasprice.safeMul(EXCHANGE.protocolFeeMultiplier());
+        bytes4 erc20BridgeProxyId = IAssetData(address(0)).ERC20Bridge.selector;
 
+        uint256 ordersLength = orders.length;
         for (uint256 i = 0; i != ordersLength; i++) {
             // Preemptively skip to avoid division by zero in _marketSellSingleOrder
             if (orders[i].makerAssetAmount == 0 || orders[i].takerAssetAmount == 0) {
@@ -164,6 +172,15 @@ contract MixinExchangeWrapper is
                 .safeSub(totalWethSpentAmount)
                 .safeSub(protocolFee);
 
+            // If the maker asset is ERC20Bridge, take a snapshot of the Forwarder contract's balance.
+            bytes4 makerAssetProxyId = orders[i].makerAssetData.readBytes4(0);
+            address tokenAddress;
+            uint256 balanceBefore;
+            if (makerAssetProxyId == erc20BridgeProxyId) {
+                tokenAddress = orders[i].makerAssetData.readAddress(16);
+                balanceBefore = IERC20Token(tokenAddress).balanceOf(address(this));
+            }
+
             (
                 uint256 wethSpentAmount,
                 uint256 makerAssetAcquiredAmount
@@ -173,6 +190,15 @@ contract MixinExchangeWrapper is
                 remainingTakerAssetFillAmount
             );
 
+            // Account for the ERC20Bridge transfering more of the maker asset than expected.
+            if (makerAssetProxyId == erc20BridgeProxyId) {
+                uint256 balanceAfter = IERC20Token(tokenAddress).balanceOf(address(this));
+                makerAssetAcquiredAmount = LibSafeMath.max256(
+                    balanceAfter.safeSub(balanceBefore),
+                    makerAssetAcquiredAmount
+                );
+            }
+
             _transferAssetToSender(orders[i].makerAssetData, makerAssetAcquiredAmount);
 
             totalWethSpentAmount = totalWethSpentAmount
@@ -206,7 +232,10 @@ contract MixinExchangeWrapper is
         )
     {
         // No taker fee or WETH fee
-        if (order.takerFee == 0 || order.takerFeeAssetData.equals(order.takerAssetData)) {
+        if (
+            order.takerFee == 0 ||
+            _areUnderlyingAssetsEqual(order.takerFeeAssetData, order.takerAssetData)
+        ) {
             // Calculate the remaining amount of takerAsset to sell
             uint256 remainingTakerAssetFillAmount = LibMath.getPartialAmountCeil(
                 order.takerAssetAmount,
@@ -228,7 +257,7 @@ contract MixinExchangeWrapper is
 
             makerAssetAcquiredAmount = singleFillResults.makerAssetFilledAmount;
         // Percentage fee
-        } else if (order.takerFeeAssetData.equals(order.makerAssetData)) {
+        } else if (_areUnderlyingAssetsEqual(order.takerFeeAssetData, order.makerAssetData)) {
             // Calculate the remaining amount of takerAsset to sell
             uint256 remainingTakerAssetFillAmount = LibMath.getPartialAmountCeil(
                 order.takerAssetAmount,
@@ -277,6 +306,8 @@ contract MixinExchangeWrapper is
             uint256 totalMakerAssetAcquiredAmount
         )
     {
+        bytes4 erc20BridgeProxyId = IAssetData(address(0)).ERC20Bridge.selector;
+
         uint256 ordersLength = orders.length;
         for (uint256 i = 0; i != ordersLength; i++) {
             // Preemptively skip to avoid division by zero in _marketBuySingleOrder
@@ -287,6 +318,15 @@ contract MixinExchangeWrapper is
             uint256 remainingMakerAssetFillAmount = makerAssetBuyAmount
                 .safeSub(totalMakerAssetAcquiredAmount);
 
+            // If the maker asset is ERC20Bridge, take a snapshot of the Forwarder contract's balance.
+            bytes4 makerAssetProxyId = orders[i].makerAssetData.readBytes4(0);
+            address tokenAddress;
+            uint256 balanceBefore;
+            if (makerAssetProxyId == erc20BridgeProxyId) {
+                tokenAddress = orders[i].makerAssetData.readAddress(16);
+                balanceBefore = IERC20Token(tokenAddress).balanceOf(address(this));
+            }
+
             (
                 uint256 wethSpentAmount,
                 uint256 makerAssetAcquiredAmount
@@ -296,6 +336,15 @@ contract MixinExchangeWrapper is
                 remainingMakerAssetFillAmount
             );
 
+            // Account for the ERC20Bridge transfering more of the maker asset than expected.
+            if (makerAssetProxyId == erc20BridgeProxyId) {
+                uint256 balanceAfter = IERC20Token(tokenAddress).balanceOf(address(this));
+                makerAssetAcquiredAmount = LibSafeMath.max256(
+                    balanceAfter.safeSub(balanceBefore),
+                    makerAssetAcquiredAmount
+                );
+            }
+
             _transferAssetToSender(orders[i].makerAssetData, makerAssetAcquiredAmount);
 
             totalWethSpentAmount = totalWethSpentAmount
@@ -316,4 +365,36 @@ contract MixinExchangeWrapper is
             ));
         }
     }
+
+    /// @dev Checks whether one asset is effectively equal to another asset.
+    ///      This is the case if they have the same ERC20Proxy/ERC20BridgeProxy asset data, or if
+    ///      one is the ERC20Bridge equivalent of the other.
+    /// @param assetData1 Byte array encoded for the takerFee asset proxy.
+    /// @param assetData2 Byte array encoded for the maker asset proxy.
+    /// @return areEqual Whether or not the underlying assets are equal.
+    function _areUnderlyingAssetsEqual(
+        bytes memory assetData1,
+        bytes memory assetData2
+    )
+        internal
+        pure
+        returns (bool)
+    {
+        bytes4 assetProxyId1 = assetData1.readBytes4(0);
+        bytes4 assetProxyId2 = assetData2.readBytes4(0);
+        bytes4 erc20ProxyId = IAssetData(address(0)).ERC20Token.selector;
+        bytes4 erc20BridgeProxyId = IAssetData(address(0)).ERC20Bridge.selector;
+
+        if (
+            (assetProxyId1 == erc20ProxyId || assetProxyId1 == erc20BridgeProxyId) &&
+            (assetProxyId2 == erc20ProxyId || assetProxyId2 == erc20BridgeProxyId)
+        ) {
+            // Compare the underlying token addresses.
+            address token1 = assetData1.readAddress(16);
+            address token2 = assetData2.readAddress(16);
+            return (token1 == token2);
+        } else {
+            return false;
+        }
+    }
 }

contracts/exchange-forwarder/contracts/src/MixinForwarderCore.sol

@@ -24,6 +24,7 @@ import "@0x/contracts-utils/contracts/src/LibRichErrors.sol";
 import "@0x/contracts-utils/contracts/src/LibSafeMath.sol";
 import "@0x/contracts-exchange-libs/contracts/src/LibOrder.sol";
 import "@0x/contracts-exchange-libs/contracts/src/LibMath.sol";
+import "@0x/contracts-asset-proxy/contracts/src/interfaces/IAssetData.sol";
 import "./libs/LibConstants.sol";
 import "./libs/LibForwarderRichErrors.sol";
 import "./interfaces/IAssets.sol";
@@ -46,7 +47,7 @@ contract MixinForwarderCore is
     constructor ()
         public
     {
-        address proxyAddress = EXCHANGE.getAssetProxy(ERC20_DATA_ID);
+        address proxyAddress = EXCHANGE.getAssetProxy(IAssetData(address(0)).ERC20Token.selector);
         if (proxyAddress == address(0)) {
             LibRichErrors.rrevert(LibForwarderRichErrors.UnregisteredAssetProxyError());
         }

contracts/exchange-forwarder/contracts/src/libs/LibConstants.sol

@@ -27,8 +27,6 @@ contract LibConstants {
 
     using LibBytes for bytes;
 
-    bytes4 constant internal ERC20_DATA_ID = bytes4(keccak256("ERC20Token(address)"));
-    bytes4 constant internal ERC721_DATA_ID = bytes4(keccak256("ERC721Token(address,uint256)"));
     uint256 constant internal MAX_UINT = 2**256 - 1;
     uint256 constant internal PERCENTAGE_DENOMINATOR = 10**18;
     uint256 constant internal MAX_FEE_PERCENTAGE = 5 * PERCENTAGE_DENOMINATOR / 100;         // 5%
@@ -36,19 +34,15 @@ contract LibConstants {
      // solhint-disable var-name-mixedcase
     IExchange internal EXCHANGE;
     IEtherToken internal ETHER_TOKEN;
-    bytes internal WETH_ASSET_DATA;
     // solhint-enable var-name-mixedcase
 
     constructor (
         address _exchange,
-        bytes memory _wethAssetData
+        address _weth
     )
         public
     {
         EXCHANGE = IExchange(_exchange);
-        WETH_ASSET_DATA = _wethAssetData;
-
-        address etherToken = _wethAssetData.readAddress(16);
-        ETHER_TOKEN = IEtherToken(etherToken);
+        ETHER_TOKEN = IEtherToken(_weth);
     }
 }

contracts/exchange-forwarder/contracts/src/libs/LibForwarderRichErrors.sol

@@ -18,8 +18,6 @@
 
 pragma solidity ^0.5.9;
 
-import "@0x/contracts-utils/contracts/src/LibRichErrors.sol";
-
 
 library LibForwarderRichErrors {
 

contracts/exchange-forwarder/contracts/test/TestForwarder.sol

@@ -0,0 +1,63 @@
+/*
+
+  Copyright 2019 ZeroEx Intl.
+
+  Licensed under the Apache License, Version 2.0 (the "License");
+  you may not use this file except in compliance with the License.
+  You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+  Unless required by applicable law or agreed to in writing, software
+  distributed under the License is distributed on an "AS IS" BASIS,
+  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  See the License for the specific language governing permissions and
+  limitations under the License.
+
+*/
+
+pragma solidity ^0.5.9;
+pragma experimental ABIEncoderV2;
+
+import "../src/MixinExchangeWrapper.sol";
+import "../src/libs/LibConstants.sol";
+
+
+contract TestForwarder is
+    LibConstants,
+    MixinExchangeWrapper
+{
+    // solhint-disable no-empty-blocks
+    constructor ()
+        public
+        LibConstants(
+            address(0),
+            address(0)
+        )
+    {}
+
+    function areUnderlyingAssetsEqual(
+        bytes memory assetData1,
+        bytes memory assetData2
+    )
+        public
+        returns (bool)
+    {
+        return _areUnderlyingAssetsEqual(
+            assetData1,
+            assetData2
+        );
+    }
+
+    function transferAssetToSender(
+        bytes memory assetData,
+        uint256 amount
+    )
+        public
+    {
+        _transferAssetToSender(
+            assetData,
+            amount
+        );
+    }
+}

contracts/exchange-forwarder/package.json

@@ -1,6 +1,6 @@
 {
     "name": "@0x/contracts-exchange-forwarder",
-    "version": "3.1.0-beta.3",
+    "version": "4.0.0",
     "engines": {
         "node": ">=6.12"
     },
@@ -14,11 +14,12 @@
         "build:ts": "tsc -b",
         "build:ci": "yarn build",
         "pre_build": "run-s compile contracts:gen generate_contract_wrappers contracts:copy",
-        "test": "echo !!! Tests have been relocated to @0x/contracts-integrations !!!",
+        "test": "yarn run_mocha",
         "rebuild_and_test": "run-s build test",
         "test:coverage": "SOLIDITY_COVERAGE=true run-s build run_mocha coverage:report:text coverage:report:lcov",
         "test:profiler": "SOLIDITY_PROFILER=true run-s build run_mocha profiler:report:html",
         "test:trace": "SOLIDITY_REVERT_TRACE=true run-s build run_mocha",
+        "run_mocha": "mocha --require source-map-support/register --require make-promises-safe 'lib/test/**/*.js' --timeout 100000 --bail --exit",
         "compile": "sol-compiler",
         "watch": "sol-compiler -w",
         "clean": "shx rm -rf lib test/generated-artifacts test/generated-wrappers generated-artifacts generated-wrappers",
@@ -38,7 +39,7 @@
     },
     "config": {
         "publicInterfaceContracts": "Forwarder",
-        "abis": "./test/generated-artifacts/@(Forwarder|IAssets|IForwarder|IForwarderCore|LibConstants|LibForwarderRichErrors|MixinAssets|MixinExchangeWrapper|MixinForwarderCore|MixinWeth).json",
+        "abis": "./test/generated-artifacts/@(Forwarder|IAssets|IForwarder|IForwarderCore|LibConstants|LibForwarderRichErrors|MixinAssets|MixinExchangeWrapper|MixinForwarderCore|MixinWeth|TestForwarder).json",
         "abis:comment": "This list is auto-generated by contracts-gen. Don't edit manually."
     },
     "repository": {
@@ -51,24 +52,24 @@
     },
     "homepage": "https://github.com/0xProject/0x-monorepo/contracts/extensions/README.md",
     "devDependencies": {
-        "@0x/abi-gen": "^4.4.0-beta.3",
-        "@0x/contracts-asset-proxy": "^2.3.0-beta.3",
-        "@0x/contracts-dev-utils": "^0.1.0-beta.3",
-        "@0x/contracts-erc20": "^2.3.0-beta.3",
-        "@0x/contracts-erc721": "^2.2.0-beta.3",
-        "@0x/contracts-exchange": "^2.2.0-beta.3",
-        "@0x/contracts-exchange-libs": "^3.1.0-beta.3",
-        "@0x/contracts-gen": "^1.1.0-beta.3",
-        "@0x/contracts-test-utils": "^3.2.0-beta.3",
-        "@0x/contracts-utils": "^3.3.0-beta.3",
-        "@0x/dev-utils": "^2.4.0-beta.3",
-        "@0x/order-utils": "^8.5.0-beta.3",
-        "@0x/sol-compiler": "^3.2.0-beta.3",
+        "@0x/abi-gen": "^5.0.0",
+        "@0x/contracts-asset-proxy": "^3.0.0",
+        "@0x/contracts-dev-utils": "^1.0.0",
+        "@0x/contracts-erc20": "^3.0.0",
+        "@0x/contracts-erc721": "^3.0.0",
+        "@0x/contracts-exchange": "^3.0.0",
+        "@0x/contracts-exchange-libs": "^4.0.0",
+        "@0x/contracts-gen": "^2.0.0",
+        "@0x/contracts-test-utils": "^4.0.0",
+        "@0x/contracts-utils": "^4.0.0",
+        "@0x/dev-utils": "^3.0.0",
+        "@0x/order-utils": "^9.0.0",
+        "@0x/sol-compiler": "^4.0.0",
         "@0x/ts-doc-gen": "^0.0.22",
-        "@0x/tslint-config": "^3.1.0-beta.2",
-        "@0x/types": "^2.5.0-beta.2",
-        "@0x/utils": "^4.6.0-beta.2",
-        "@0x/web3-wrapper": "^6.1.0-beta.2",
+        "@0x/tslint-config": "^4.0.0",
+        "@0x/types": "^3.0.0",
+        "@0x/utils": "^5.0.0",
+        "@0x/web3-wrapper": "^7.0.0",
         "@types/lodash": "4.14.104",
         "@types/mocha": "^5.2.7",
         "@types/node": "*",
@@ -88,9 +89,9 @@
         "typescript": "3.0.1"
     },
     "dependencies": {
-        "@0x/base-contract": "^5.5.0-beta.3",
-        "@0x/typescript-typings": "^4.4.0-beta.2",
-        "ethereum-types": "^2.2.0-beta.2"
+        "@0x/base-contract": "^6.0.0",
+        "@0x/typescript-typings": "^5.0.0",
+        "ethereum-types": "^3.0.0"
     },
     "publishConfig": {
         "access": "public"

contracts/exchange-forwarder/src/index.ts

@@ -1,6 +1,6 @@
 export { artifacts } from './artifacts';
 export { ForwarderContract } from './wrappers';
-export import ForwarderRevertErrors = require('./revert_errors');
+export { ExchangeForwarderRevertErrors } from '@0x/utils';
 export {
     ContractArtifact,
     ContractChains,

contracts/exchange-forwarder/test/artifacts.ts

@@ -15,6 +15,7 @@ import * as MixinAssets from '../test/generated-artifacts/MixinAssets.json';
 import * as MixinExchangeWrapper from '../test/generated-artifacts/MixinExchangeWrapper.json';
 import * as MixinForwarderCore from '../test/generated-artifacts/MixinForwarderCore.json';
 import * as MixinWeth from '../test/generated-artifacts/MixinWeth.json';
+import * as TestForwarder from '../test/generated-artifacts/TestForwarder.json';
 export const artifacts = {
     Forwarder: Forwarder as ContractArtifact,
     MixinAssets: MixinAssets as ContractArtifact,
@@ -26,4 +27,5 @@ export const artifacts = {
     IForwarderCore: IForwarderCore as ContractArtifact,
     LibConstants: LibConstants as ContractArtifact,
     LibForwarderRichErrors: LibForwarderRichErrors as ContractArtifact,
+    TestForwarder: TestForwarder as ContractArtifact,
 };

contracts/exchange-forwarder/test/asset_test.ts

@@ -0,0 +1,184 @@
+import { IAssetDataContract } from '@0x/contracts-asset-proxy';
+import {
+    artifacts as ERC20Artifacts,
+    DummyERC20TokenContract,
+    ERC20TokenEvents,
+    ERC20TokenTransferEventArgs,
+} from '@0x/contracts-erc20';
+import {
+    artifacts as ERC721Artifacts,
+    DummyERC721TokenContract,
+    ERC721TokenEvents,
+    ERC721TokenTransferEventArgs,
+} from '@0x/contracts-erc721';
+import {
+    blockchainTests,
+    constants,
+    expect,
+    getRandomInteger,
+    hexRandom,
+    hexSlice,
+    randomAddress,
+    verifyEventsFromLogs,
+} from '@0x/contracts-test-utils';
+import { BigNumber, ExchangeForwarderRevertErrors } from '@0x/utils';
+
+import { artifacts } from './artifacts';
+import { TestForwarderContract } from './wrappers';
+
+blockchainTests('Supported asset type unit tests', env => {
+    let forwarder: TestForwarderContract;
+    let assetDataEncoder: IAssetDataContract;
+    let bridgeAddress: string;
+    let bridgeData: string;
+    let receiver: string;
+
+    let erc20Token: DummyERC20TokenContract;
+    let erc721Token: DummyERC721TokenContract;
+    let nftId: BigNumber;
+
+    let erc20AssetData: string;
+    let erc721AssetData: string;
+    let erc20BridgeAssetData: string;
+
+    before(async () => {
+        [receiver] = await env.getAccountAddressesAsync();
+        assetDataEncoder = new IAssetDataContract(constants.NULL_ADDRESS, env.provider);
+
+        forwarder = await TestForwarderContract.deployFrom0xArtifactAsync(
+            artifacts.TestForwarder,
+            env.provider,
+            env.txDefaults,
+            { ...artifacts, ...ERC20Artifacts, ...ERC721Artifacts },
+        );
+
+        erc20Token = await DummyERC20TokenContract.deployFrom0xArtifactAsync(
+            ERC20Artifacts.DummyERC20Token,
+            env.provider,
+            env.txDefaults,
+            ERC20Artifacts,
+            constants.DUMMY_TOKEN_NAME,
+            constants.DUMMY_TOKEN_SYMBOL,
+            constants.DUMMY_TOKEN_DECIMALS,
+            constants.DUMMY_TOKEN_TOTAL_SUPPLY,
+        );
+        erc20AssetData = assetDataEncoder.ERC20Token(erc20Token.address).getABIEncodedTransactionData();
+
+        erc721Token = await DummyERC721TokenContract.deployFrom0xArtifactAsync(
+            ERC721Artifacts.DummyERC721Token,
+            env.provider,
+            env.txDefaults,
+            ERC721Artifacts,
+            constants.DUMMY_TOKEN_NAME,
+            constants.DUMMY_TOKEN_SYMBOL,
+        );
+        nftId = getRandomInteger(constants.ZERO_AMOUNT, constants.MAX_UINT256);
+        erc721AssetData = assetDataEncoder.ERC721Token(erc721Token.address, nftId).getABIEncodedTransactionData();
+
+        bridgeAddress = randomAddress();
+        bridgeData = hexRandom();
+        erc20BridgeAssetData = assetDataEncoder
+            .ERC20Bridge(erc20Token.address, bridgeAddress, bridgeData)
+            .getABIEncodedTransactionData();
+    });
+
+    describe('_areUnderlyingAssetsEqual', () => {
+        it('returns true if assetData1 == assetData2 are ERC20', async () => {
+            const result = await forwarder.areUnderlyingAssetsEqual(erc20AssetData, erc20AssetData).callAsync();
+            expect(result).to.be.true();
+        });
+        it('returns true if assetData1 == assetData2 are ERC20Bridge', async () => {
+            const result = await forwarder
+                .areUnderlyingAssetsEqual(erc20BridgeAssetData, erc20BridgeAssetData)
+                .callAsync();
+            expect(result).to.be.true();
+        });
+        it('returns true if assetData2 is the ERC20Bridge equivalent of assetData1', async () => {
+            const result = await forwarder.areUnderlyingAssetsEqual(erc20AssetData, erc20BridgeAssetData).callAsync();
+            expect(result).to.be.true();
+        });
+        it('returns false if assetData1 != assetData2 are ERC20', async () => {
+            const differentERC20AssetData = assetDataEncoder.ERC20Token(randomAddress()).getABIEncodedTransactionData();
+            const result = await forwarder
+                .areUnderlyingAssetsEqual(erc20AssetData, differentERC20AssetData)
+                .callAsync();
+            expect(result).to.be.false();
+        });
+        it('returns false if assetData1 is ERC20 and assetData2 is ERC721', async () => {
+            const result = await forwarder.areUnderlyingAssetsEqual(erc20AssetData, erc721AssetData).callAsync();
+            expect(result).to.be.false();
+        });
+        it('returns false if assetData2 is ERC20Bridge, but for a different token than assetData1', async () => {
+            const mismatchedErc20BridgeAssetData = assetDataEncoder
+                .ERC20Bridge(randomAddress(), bridgeAddress, bridgeData)
+                .getABIEncodedTransactionData();
+            const result = await forwarder
+                .areUnderlyingAssetsEqual(erc20AssetData, mismatchedErc20BridgeAssetData)
+                .callAsync();
+            expect(result).to.be.false();
+        });
+        it('returns false if assetData1 == assetData2 are ERC721', async () => {
+            const result = await forwarder.areUnderlyingAssetsEqual(erc721AssetData, erc721AssetData).callAsync();
+            expect(result).to.be.false();
+        });
+    });
+
+    describe('_transferAssetToSender', () => {
+        const TRANSFER_AMOUNT = new BigNumber(1);
+        before(async () => {
+            await erc20Token
+                .setBalance(forwarder.address, constants.INITIAL_ERC20_BALANCE)
+                .awaitTransactionSuccessAsync();
+            await erc721Token.mint(forwarder.address, nftId).awaitTransactionSuccessAsync();
+        });
+
+        it('transfers an ERC20 token given ERC20 assetData', async () => {
+            const txReceipt = await forwarder
+                .transferAssetToSender(erc20AssetData, TRANSFER_AMOUNT)
+                .awaitTransactionSuccessAsync({ from: receiver });
+            verifyEventsFromLogs<ERC20TokenTransferEventArgs>(
+                txReceipt.logs,
+                [{ _from: forwarder.address, _to: receiver, _value: TRANSFER_AMOUNT }],
+                ERC20TokenEvents.Transfer,
+            );
+        });
+        it('transfers an ERC721 token given ERC721 assetData and amount == 1', async () => {
+            const txReceipt = await forwarder
+                .transferAssetToSender(erc721AssetData, TRANSFER_AMOUNT)
+                .awaitTransactionSuccessAsync({ from: receiver });
+            verifyEventsFromLogs<ERC721TokenTransferEventArgs>(
+                txReceipt.logs,
+                [{ _from: forwarder.address, _to: receiver, _tokenId: nftId }],
+                ERC721TokenEvents.Transfer,
+            );
+        });
+        it('reverts if attempting to transfer an ERC721 token with amount != 1', async () => {
+            const invalidAmount = new BigNumber(2);
+            const tx = forwarder
+                .transferAssetToSender(erc721AssetData, invalidAmount)
+                .awaitTransactionSuccessAsync({ from: receiver });
+            const expectedError = new ExchangeForwarderRevertErrors.Erc721AmountMustEqualOneError(invalidAmount);
+            return expect(tx).to.revertWith(expectedError);
+        });
+        it('transfers an ERC20 token given ERC20Bridge assetData', async () => {
+            const txReceipt = await forwarder
+                .transferAssetToSender(erc20BridgeAssetData, TRANSFER_AMOUNT)
+                .awaitTransactionSuccessAsync({ from: receiver });
+            verifyEventsFromLogs<ERC20TokenTransferEventArgs>(
+                txReceipt.logs,
+                [{ _from: forwarder.address, _to: receiver, _value: TRANSFER_AMOUNT }],
+                ERC20TokenEvents.Transfer,
+            );
+        });
+        it('reverts if assetData is unsupported', async () => {
+            const randomBytes = hexRandom();
+            const tx = forwarder
+                .transferAssetToSender(randomBytes, TRANSFER_AMOUNT)
+                .awaitTransactionSuccessAsync({ from: receiver });
+            const expectedError = new ExchangeForwarderRevertErrors.UnsupportedAssetProxyError(
+                hexSlice(randomBytes, 0, 4),
+            );
+            return expect(tx).to.revertWith(expectedError);
+        });
+    });
+});

contracts/exchange-forwarder/test/wrappers.ts

@@ -13,3 +13,4 @@ export * from '../test/generated-wrappers/mixin_assets';
 export * from '../test/generated-wrappers/mixin_exchange_wrapper';
 export * from '../test/generated-wrappers/mixin_forwarder_core';
 export * from '../test/generated-wrappers/mixin_weth';
+export * from '../test/generated-wrappers/test_forwarder';

contracts/exchange-forwarder/tsconfig.json

@@ -13,7 +13,8 @@
         "test/generated-artifacts/MixinAssets.json",
         "test/generated-artifacts/MixinExchangeWrapper.json",
         "test/generated-artifacts/MixinForwarderCore.json",
-        "test/generated-artifacts/MixinWeth.json"
+        "test/generated-artifacts/MixinWeth.json",
+        "test/generated-artifacts/TestForwarder.json"
     ],
     "exclude": ["./deploy/solc/solc_bin"]
 }

contracts/exchange-libs/CHANGELOG.json

@@ -1,4 +1,135 @@
 [
+    {
+        "version": "4.0.0",
+        "changes": [
+            {
+                "note": "Drastically reduced bundle size by adding .npmignore, only exporting specific artifacts/wrappers/utils",
+                "pr": 2330
+            },
+            {
+                "note": "Introduced new export LibMathRevertErrors",
+                "pr": 2321
+            },
+            {
+                "note": "Break up `LibEIP712` into reusable components",
+                "pr": 1742
+            },
+            {
+                "note": "Add `chainId` to EIP712 domain schema",
+                "pr": 1742
+            },
+            {
+                "note": "Rename `verifyingContract` to `verifyingContractAddress` in domain schema",
+                "pr": 1742
+            },
+            {
+                "note": "Add LibZeroExTransaction contract",
+                "pr": 1753
+            },
+            {
+                "note": "Add verifyingContractIfExists arg to LibEIP712ExchangeDomain constructor",
+                "pr": 1753
+            },
+            {
+                "note": "Remove LibEIP712ExchangeDomainConstants and LibEIP712 contracts",
+                "pr": 1753
+            },
+            {
+                "note": "Add `LibExchangeRichErrorDecoder` contract.",
+                "pr": 1790
+            },
+            {
+                "note": "Break out types/interaces from `MExchangeRichErrors` into `MExchangeRichErrorTypes`.",
+                "pr": 1790
+            },
+            {
+                "note": "Reorder some revert error parameters for consistency",
+                "pr": 1790
+            },
+            {
+                "note": "Add new `Order` fields for arbitrary fee tokens (ZEIP-28).",
+                "pr": 1819
+            },
+            {
+                "note": "Remove `LibAbiEncoder` and `LibConstants`.",
+                "pr": 1819
+            },
+            {
+                "note": "Add `generate-exchange-selectors` package script.",
+                "pr": 1819
+            },
+            {
+                "note": "Add `expirationTimeSeconds` to `ZeroExTransaction` struct",
+                "pr": 1823
+            },
+            {
+                "note": "Add reference functions for `LibMath` and `LibFillResults`",
+                "pr": 2031
+            },
+            {
+                "note": "Move in revamped `LibMath` tests from the `contracts-exchange` package.",
+                "pr": 2031
+            },
+            {
+                "note": "Move in revamped `LibFillResults` tests from the `contracts-exchange` package.",
+                "pr": 2031
+            },
+            {
+                "note": "Remove unecessary zero-denominator checks in `LibMath`.",
+                "pr": 2031
+            },
+            {
+                "note": "Fix coverage hooks.",
+                "pr": 2031
+            },
+            {
+                "note": "Regenerate selectors.",
+                "pr": 2042
+            },
+            {
+                "note": "Convert `LibFillResults`, `LibOrder`, `LibZeroExTransaction`, and `LibMath` to libraries",
+                "pr": 2055
+            },
+            {
+                "note": "Remove `LibExchangeSelectors`",
+                "pr": 2055
+            },
+            {
+                "note": "Add `LibExchangeRichErrors`",
+                "pr": 2055
+            },
+            {
+                "note": "Add `calculateFillResults` and `calculateMatchedFillResults` to `LibFillResults`",
+                "pr": 2055
+            },
+            {
+                "note": "Remove `_hashEIP712ExchangeMessage` from `LibEIP712ExchangeDomain`",
+                "pr": 2055
+            },
+            {
+                "note": "Compile and export all contracts, artifacts, and wrappers by default",
+                "pr": 2055
+            },
+            {
+                "note": "Update `IncompleteFillError` to take an `errorCode`, `expectedAssetFillAmount`, and `actualAssetFillAmount` fields.",
+                "pr": 2075
+            },
+            {
+                "note": "Move `IWallet.sol` from `asset-proxy` and `exchange` packages to here.",
+                "pr": 2233
+            }
+        ],
+        "timestamp": 1575296764
+    },
+    {
+        "version": "3.1.0-beta.4",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ],
+        "timestamp": 1575290197
+    },
     {
         "version": "3.1.0-beta.3",
         "changes": [

contracts/exchange-libs/CHANGELOG.md

@@ -5,6 +5,42 @@ Edit the package's CHANGELOG.json file only.
 
 CHANGELOG
 
+## v4.0.0 - _December 2, 2019_
+
+    * Drastically reduced bundle size by adding .npmignore, only exporting specific artifacts/wrappers/utils (#2330)
+    * Introduced new export LibMathRevertErrors (#2321)
+    * Break up `LibEIP712` into reusable components (#1742)
+    * Add `chainId` to EIP712 domain schema (#1742)
+    * Rename `verifyingContract` to `verifyingContractAddress` in domain schema (#1742)
+    * Add LibZeroExTransaction contract (#1753)
+    * Add verifyingContractIfExists arg to LibEIP712ExchangeDomain constructor (#1753)
+    * Remove LibEIP712ExchangeDomainConstants and LibEIP712 contracts (#1753)
+    * Add `LibExchangeRichErrorDecoder` contract. (#1790)
+    * Break out types/interaces from `MExchangeRichErrors` into `MExchangeRichErrorTypes`. (#1790)
+    * Reorder some revert error parameters for consistency (#1790)
+    * Add new `Order` fields for arbitrary fee tokens (ZEIP-28). (#1819)
+    * Remove `LibAbiEncoder` and `LibConstants`. (#1819)
+    * Add `generate-exchange-selectors` package script. (#1819)
+    * Add `expirationTimeSeconds` to `ZeroExTransaction` struct (#1823)
+    * Add reference functions for `LibMath` and `LibFillResults` (#2031)
+    * Move in revamped `LibMath` tests from the `contracts-exchange` package. (#2031)
+    * Move in revamped `LibFillResults` tests from the `contracts-exchange` package. (#2031)
+    * Remove unecessary zero-denominator checks in `LibMath`. (#2031)
+    * Fix coverage hooks. (#2031)
+    * Regenerate selectors. (#2042)
+    * Convert `LibFillResults`, `LibOrder`, `LibZeroExTransaction`, and `LibMath` to libraries (#2055)
+    * Remove `LibExchangeSelectors` (#2055)
+    * Add `LibExchangeRichErrors` (#2055)
+    * Add `calculateFillResults` and `calculateMatchedFillResults` to `LibFillResults` (#2055)
+    * Remove `_hashEIP712ExchangeMessage` from `LibEIP712ExchangeDomain` (#2055)
+    * Compile and export all contracts, artifacts, and wrappers by default (#2055)
+    * Update `IncompleteFillError` to take an `errorCode`, `expectedAssetFillAmount`, and `actualAssetFillAmount` fields. (#2075)
+    * Move `IWallet.sol` from `asset-proxy` and `exchange` packages to here. (#2233)
+
+## v3.1.0-beta.4 - _December 2, 2019_
+
+    * Dependencies updated
+
 ## v3.1.0-beta.3 - _November 20, 2019_
 
     * Dependencies updated

contracts/exchange-libs/package.json

@@ -1,6 +1,6 @@
 {
     "name": "@0x/contracts-exchange-libs",
-    "version": "3.1.0-beta.3",
+    "version": "4.0.0",
     "engines": {
         "node": ">=6.12"
     },
@@ -52,15 +52,15 @@
     },
     "homepage": "https://github.com/0xProject/0x-monorepo/contracts/libs/README.md",
     "devDependencies": {
-        "@0x/abi-gen": "^4.4.0-beta.3",
-        "@0x/contracts-gen": "^1.1.0-beta.3",
-        "@0x/contracts-test-utils": "^3.2.0-beta.3",
-        "@0x/dev-utils": "^2.4.0-beta.3",
-        "@0x/sol-compiler": "^3.2.0-beta.3",
-        "@0x/subproviders": "^5.1.0-beta.2",
+        "@0x/abi-gen": "^5.0.0",
+        "@0x/contracts-gen": "^2.0.0",
+        "@0x/contracts-test-utils": "^4.0.0",
+        "@0x/dev-utils": "^3.0.0",
+        "@0x/sol-compiler": "^4.0.0",
+        "@0x/subproviders": "^6.0.0",
         "@0x/ts-doc-gen": "^0.0.22",
-        "@0x/tslint-config": "^3.1.0-beta.2",
-        "@0x/web3-wrapper": "^6.1.0-beta.2",
+        "@0x/tslint-config": "^4.0.0",
+        "@0x/web3-wrapper": "^7.0.0",
         "@types/lodash": "4.14.104",
         "@types/mocha": "^5.2.7",
         "@types/node": "*",
@@ -81,13 +81,13 @@
         "typescript": "3.0.1"
     },
     "dependencies": {
-        "@0x/base-contract": "^5.5.0-beta.3",
-        "@0x/contracts-utils": "^3.3.0-beta.3",
-        "@0x/order-utils": "^8.5.0-beta.3",
-        "@0x/types": "^2.5.0-beta.2",
-        "@0x/typescript-typings": "^4.4.0-beta.2",
-        "@0x/utils": "^4.6.0-beta.2",
-        "ethereum-types": "^2.2.0-beta.2"
+        "@0x/base-contract": "^6.0.0",
+        "@0x/contracts-utils": "^4.0.0",
+        "@0x/order-utils": "^9.0.0",
+        "@0x/types": "^3.0.0",
+        "@0x/typescript-typings": "^5.0.0",
+        "@0x/utils": "^5.0.0",
+        "ethereum-types": "^3.0.0"
     },
     "publishConfig": {
         "access": "public"

contracts/exchange-libs/src/index.ts

@@ -8,7 +8,7 @@ export {
     LibOrderContract,
     LibZeroExTransactionContract,
 } from './wrappers';
-export import LibMathRevertErrors = require('./lib_math_revert_errors');
+export { LibMathRevertErrors } from '@0x/utils';
 
 import * as ReferenceFunctionsToExport from './reference_functions';
 export import ReferenceFunctions = ReferenceFunctionsToExport;

contracts/exchange-libs/src/reference_functions.ts

@@ -1,8 +1,6 @@
 import { ReferenceFunctions } from '@0x/contracts-utils';
 import { FillResults, Order } from '@0x/types';
-import { BigNumber } from '@0x/utils';
-
-import LibMathRevertErrors = require('./lib_math_revert_errors');
+import { BigNumber, LibMathRevertErrors } from '@0x/utils';
 
 const { safeAdd, safeSub, safeMul, safeDiv } = ReferenceFunctions;
 

contracts/exchange-libs/test/lib_fill_results.ts

@@ -9,11 +9,10 @@ import {
 } from '@0x/contracts-test-utils';
 import { SafeMathRevertErrors } from '@0x/contracts-utils';
 import { FillResults, MatchedFillResults, Order } from '@0x/types';
-import { BigNumber } from '@0x/utils';
+import { BigNumber, LibMathRevertErrors } from '@0x/utils';
 import { Web3Wrapper } from '@0x/web3-wrapper';
 import * as _ from 'lodash';
 
-import LibMathRevertErrors = require('../src/lib_math_revert_errors');
 import { addFillResults, calculateFillResults, getPartialAmountFloor } from '../src/reference_functions';
 
 import { artifacts } from './artifacts';

contracts/exchange-libs/test/lib_math.ts

@@ -7,9 +7,8 @@ import {
     uint256Values,
 } from '@0x/contracts-test-utils';
 import { SafeMathRevertErrors } from '@0x/contracts-utils';
-import { BigNumber } from '@0x/utils';
+import { BigNumber, LibMathRevertErrors } from '@0x/utils';
 
-import LibMathRevertErrors = require('../src/lib_math_revert_errors');
 import {
     getPartialAmountCeil,
     getPartialAmountFloor,

contracts/exchange-libs/test/reference_functions.ts

@@ -1,9 +1,8 @@
 import { constants, describe, expect } from '@0x/contracts-test-utils';
 import { SafeMathRevertErrors } from '@0x/contracts-utils';
-import { BigNumber } from '@0x/utils';
+import { BigNumber, LibMathRevertErrors } from '@0x/utils';
 import * as _ from 'lodash';
 
-import LibMathRevertErrors = require('../src/lib_math_revert_errors');
 import {
     addFillResults,
     getPartialAmountCeil,

contracts/exchange/CHANGELOG.json

@@ -1,4 +1,235 @@
 [
+    {
+        "version": "3.0.0",
+        "changes": [
+            {
+                "note": "Drastically reduced bundle size by adding .npmignore, only exporting specific artifacts/wrappers/utils",
+                "pr": 2330
+            },
+            {
+                "note": "Introduced new export ExchangeRevertErrors",
+                "pr": 2321
+            },
+            {
+                "note": "Round up in `marketBuyOrdersNoThrow()` so `marketBuyOrdersFillOrKill()` doesn't throw up.",
+                "pr": 2338
+            },
+            {
+                "note": "LocalBalanceStore.create and constructor now require an instance of DevUtilsContract",
+                "pr": 2304
+            },
+            {
+                "note": "In LocalBalanceStore, `transferAsset` is now `transferAssetAsync`",
+                "pr": 2304
+            },
+            {
+                "note": "Test utility classes AssetWrapper, MatchOrderTester, and OrderFactoryFromScenario constructors now require an instance of DevUtilsContract",
+                "pr": 2304
+            },
+            {
+                "note": "In OrderFactoryFromScenario, `generateOrder` is now `generateOrderAsync`",
+                "pr": 2304
+            },
+            {
+                "note": "Use new/cheaper reentrancy guard/mutex",
+                "pr": 1699
+            },
+            {
+                "note": "Update domain separator",
+                "pr": 1742
+            },
+            {
+                "note": "Refactor `executeTransaction` to take `ZeroExTransaction` struct as input",
+                "pr": 1753
+            },
+            {
+                "note": "Refactor example contracts that use `executeTransaction`",
+                "pr": 1753
+            },
+            {
+                "note": "Upgrade all string reverts to rich reverts",
+                "pr": 1761
+            },
+            {
+                "note": "Add support for `SignatureType.OrderValidator` for orders",
+                "pr": 1774
+            },
+            {
+                "note": "Add support for `SignatureType.WalletOrderValidator` for orders",
+                "pr": 1774
+            },
+            {
+                "note": "Add a `bytes` return value to `executeTransaction`, which is equal to the encoded return data of the underlying Exchange function call",
+                "pr": 1793
+            },
+            {
+                "note": "Implement `batchExecuteTransactions`",
+                "pr": 1793
+            },
+            {
+                "note": "Refactor preSign to be compatible with `executeTransaction`",
+                "pr": 1793
+            },
+            {
+                "note": "Remove ZRX fees in lieu of arbitrary maker and taker fee tokens.",
+                "pr": 1819
+            },
+            {
+                "note": "Incorporate Multi-asset and ERC1155 tests into `fillOrder` and `matchOrders` tests",
+                "pr": 1819
+            },
+            {
+                "note": "Swap fill order from maker -> taker to taker -> maker",
+                "pr": 1819
+            },
+            {
+                "note": "Avoid redundant transfer in `fillOrder()` and `matchOrders()` when maker/taker is the same as feeRecipient and assets are the same",
+                "pr": 1819
+            },
+            {
+                "note": "Implement `cancelOrderNoThrow` and `batchCancelOrdersNoThrow` functions",
+                "pr": 1827
+            },
+            {
+                "note": "`executeTransaction` will now revert if the input transaction is expired",
+                "pr": 1832
+            },
+            {
+                "note": "Log an `TransactionExecuted` event when an `executeTransaction` call is successful",
+                "pr": 1832
+            },
+            {
+                "note": "Return a FillResults array for batch fill variants",
+                "pr": 1834
+            },
+            {
+                "note": "Add `MixinTransferSimulator` contract for simulating multiple transfers on-chain",
+                "pr": 1868
+            },
+            {
+                "note": "Add `EIP1271Wallet` signature type",
+                "pr": 1885
+            },
+            {
+                "note": "Remove `WalletOrderValidator` and `OrderValidator` signature types",
+                "pr": 1885
+            },
+            {
+                "note": "Make the regular `Validator` signature type have EIP1271 behavior",
+                "pr": 1885
+            },
+            {
+                "note": "Always check signature types that are validated via contract (not just on first fill).",
+                "pr": 1885
+            },
+            {
+                "note": "Remove unecessary rich revert error types.",
+                "pr": 1885
+            },
+            {
+                "note": "Add `IEIP1271Wallet` interface",
+                "pr": 1885
+            },
+            {
+                "note": "Add `validatorAddress` field to `SignatureValidatorError` rich reverts",
+                "pr": 1885
+            },
+            {
+                "note": "Make `calculateMatchedFillResults` public",
+                "pr": 1885
+            },
+            {
+                "note": "Updated RichErrors to the library pattern",
+                "pr": 1913
+            },
+            {
+                "note": "Rewrote _dispatchTransferFrom in Solidity",
+                "pr": 2020
+            },
+            {
+                "note": "Add `TestIsolatedExchange` contract and `IsolatedExchangeWrapper` test class",
+                "pr": 2031
+            },
+            {
+                "note": "Add `ReferenceFunctions` as package export.",
+                "pr": 2031
+            },
+            {
+                "note": "Remove `TestExchangeMath.sol`. Exchange math functions are now tested in the `exchange-libs` package and reference implementations are available there as well.",
+                "pr": 2031
+            },
+            {
+                "note": "Remove functions from `TestExchangeInternals.sol` that are no longer tested in this package.",
+                "pr": 2031
+            },
+            {
+                "note": "Remove `_assertValidFill()`",
+                "pr": 2031
+            },
+            {
+                "note": "Add `wrapper_unit_tests` tests and `TestWrapperFunctions` contract",
+                "pr": 2042
+            },
+            {
+                "note": "Disallow `signerAddress == 0` in signature validation functions.",
+                "pr": 2042
+            },
+            {
+                "note": "Update `Wallet` signature type behavior to be in line with v2.1.",
+                "pr": 2042
+            },
+            {
+                "note": "Add (semi) automated reentrancy tests and remove manual ones",
+                "pr": 2042
+            },
+            {
+                "note": "Refactor to use new `LibFillResults`, `LibOrder`, `LibZeroExTransaction`, and `LibMath` to libraries",
+                "pr": 2055
+            },
+            {
+                "note": "Remove `LibExchangeRichErrors` and `IExchangeRichErrors`",
+                "pr": 2055
+            },
+            {
+                "note": "Use built in selectors instead of `LibExchangeSelectors` constants",
+                "pr": 2055
+            },
+            {
+                "note": "Move `calculateFillResults` and `calculateMatchedFillResults` to `LibFillResults` in `exchange-libs` package",
+                "pr": 2055
+            },
+            {
+                "note": "Compile and export all contracts, artifacts, and wrappers by default",
+                "pr": 2055
+            },
+            {
+                "note": "Rename `marketSellOrders` and `marketBuyOrders` back to `marketSellOrdersNoThrow` and `marketBuyOrdersNoThrow`.",
+                "pr": 2075
+            },
+            {
+                "note": "Introduce new `marketSellOrdersFillOrKill` and `marketBuyOrdersFillOrKill` functions.",
+                "pr": 2075
+            },
+            {
+                "note": "Use `abi.decode()` in `LibExchangeRichErrorDecoder` over `LibBytes`.",
+                "pr": 2075
+            },
+            {
+                "note": "Overridden functions in `ReentrancyTester` now return sane values.",
+                "pr": 2075
+            }
+        ],
+        "timestamp": 1575296764
+    },
+    {
+        "version": "2.2.0-beta.4",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ],
+        "timestamp": 1575290197
+    },
     {
         "version": "2.2.0-beta.3",
         "changes": [