Publish

- @0x/contracts-asset-proxy@3.3.0
 - @0x/contracts-broker@1.1.5
 - @0x/contracts-coordinator@3.1.6
 - @0x/contracts-dev-utils@1.3.4
 - @0x/contracts-erc1155@2.1.6
 - @0x/contracts-erc20-bridge-sampler@1.6.0
 - @0x/contracts-erc20@3.2.0
 - @0x/contracts-erc721@3.1.6
 - @0x/contracts-exchange-forwarder@4.2.6
 - @0x/contracts-exchange-libs@4.3.6
 - @0x/contracts-exchange@3.2.6
 - @0x/contracts-extensions@6.2.0
 - @0x/contracts-integrations@2.5.2
 - @0x/contracts-multisig@4.1.6
 - @0x/contracts-staking@2.0.13
 - @0x/contracts-test-utils@5.3.3
 - @0x/contracts-utils@4.5.0
 - @0x/contracts-zero-ex@0.1.1
 - 0x.js@9.1.6
 - @0x/abi-gen@5.3.0
 - @0x/assert@3.0.8
 - @0x/asset-swapper@4.5.0
 - @0x/base-contract@6.2.2
 - @0x/connect@6.0.8
 - @0x/contract-addresses@4.10.0
 - @0x/contract-artifacts@3.7.0
 - @0x/contract-wrappers-test@12.2.15
 - @0x/contract-wrappers@13.7.0
 - @0x/contracts-gen@2.0.9
 - @0x/dev-utils@3.2.2
 - ethereum-types@3.1.1
 - @0x/instant@1.0.52
 - @0x/json-schemas@5.0.8
 - @0x/migrations@6.3.0
 - @0x/monorepo-scripts@1.0.53
 - @0x/order-utils@10.2.5
 - @0x/orderbook@2.2.6
 - @0x/sol-compiler@4.1.0
 - @0x/sol-coverage@4.0.9
 - @0x/sol-doc@3.1.7
 - @0x/sol-profiler@4.0.9
 - @0x/sol-resolver@3.0.4
 - @0x/sol-trace@3.0.9
 - @0x/sol-tracing-utils@7.0.9
 - @0x/sra-spec@3.0.8
 - @0x/subproviders@6.1.0
 - @0x/types@3.1.3
 - @0x/typescript-typings@5.1.0
 - @0x/utils@5.5.0
 - @0x/web3-wrapper@7.1.0

.circleci/config.yml

@@ -38,17 +38,7 @@ jobs:
                   path: ~/repo/packages/abi-gen/test-cli/output
             - store_artifacts:
                   path: ~/repo/packages/contract-wrappers/generated_docs
-    test-contracts-ganache:
-        resource_class: medium+
-        docker:
-            - image: nikolaik/python-nodejs:python3.7-nodejs8
-        working_directory: ~/repo
-        steps:
-            - 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-extensions @0x/contracts-asset-proxy @0x/contracts-exchange @0x/contracts-exchange-forwarder @0x/contracts-coordinator @0x/contracts-staking
-    test-exchange-ganache-3.0:
+    test-exchange-ganache:
         resource_class: medium+
         docker:
             - image: nikolaik/python-nodejs:python3.7-nodejs8
@@ -58,7 +48,7 @@ jobs:
                   keys:
                       - repo-{{ .Environment.CIRCLE_SHA1 }}
             - run: yarn wsrun test:circleci @0x/contracts-exchange
-    test-integrations-ganache-3.0:
+    test-integrations-ganache:
         resource_class: medium+
         docker:
             - image: nikolaik/python-nodejs:python3.7-nodejs8
@@ -68,7 +58,7 @@ jobs:
                   keys:
                       - repo-{{ .Environment.CIRCLE_SHA1 }}
             - run: yarn wsrun test:circleci @0x/contracts-integrations
-    test-contracts-rest-ganache-3.0:
+    test-contracts-staking-ganache:
         resource_class: medium+
         docker:
             - image: nikolaik/python-nodejs:python3.7-nodejs8
@@ -77,11 +67,17 @@ 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-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.
-            # - run: yarn wsrun test:circleci @0x/contracts-extensions
+            - run: yarn wsrun test:circleci @0x/contracts-staking
+    test-contracts-rest-ganache:
+        resource_class: medium+
+        docker:
+            - image: nikolaik/python-nodejs:python3.7-nodejs8
+        working_directory: ~/repo
+        steps:
+            - 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-coordinator @0x/contracts-erc20-bridge-sampler @0x/contracts-broker @0x/contracts-zero-ex
     test-publish:
         resource_class: medium+
         docker:
@@ -194,6 +190,8 @@ jobs:
         docker:
             - image: nikolaik/python-nodejs:python3.7-nodejs8
             - image: 0xorg/ganache-cli:6.0.0
+              environment:
+                  VERSION: '6.0.0'
             - image: 0xorg/mesh:0xV3
               environment:
                   ETHEREUM_RPC_URL: 'http://localhost:8545'
@@ -417,13 +415,16 @@ workflows:
     main:
         jobs:
             - build
-            - test-exchange-ganache-3.0:
+            - test-exchange-ganache:
                   requires:
                       - build
-            - test-integrations-ganache-3.0:
+            - test-integrations-ganache:
                   requires:
                       - build
-            - test-contracts-rest-ganache-3.0:
+            - test-contracts-staking-ganache:
+                  requires:
+                      - build
+            - test-contracts-rest-ganache:
                   requires:
                       - build
             - test-rest:
@@ -440,8 +441,9 @@ workflows:
                       - build
             - submit-coverage:
                   requires:
-                      - test-contracts-rest-ganache-3.0
-                      - test-exchange-ganache-3.0
+                      - test-contracts-rest-ganache
+                      - test-contracts-staking-ganache
+                      - test-exchange-ganache
                       - test-rest
                       - static-tests
             - test-python:

.gitignore

@@ -111,6 +111,8 @@ contracts/exchange-forwarder/generated-artifacts/
 contracts/exchange-forwarder/test/generated-artifacts/
 contracts/dev-utils/generated-artifacts/
 contracts/dev-utils/test/generated-artifacts/
+contracts/zero-ex/generated-artifacts/
+contracts/zero-ex/test/generated-artifacts/
 packages/sol-tracing-utils/test/fixtures/artifacts/
 python-packages/contract_artifacts/src/zero_ex/contract_artifacts/artifacts/
 
@@ -165,6 +167,8 @@ contracts/exchange-forwarder/generated-wrappers/
 contracts/exchange-forwarder/test/generated-wrappers/
 contracts/dev-utils/generated-wrappers/
 contracts/dev-utils/test/generated-wrappers/
+contracts/zero-ex/generated-wrappers/
+contracts/zero-ex/test/generated-wrappers/
 python-packages/contract_wrappers/src/zero_ex/contract_wrappers/*/__init__.py
 
 # solc-bin in sol-compiler

.prettierignore

@@ -64,6 +64,10 @@ lib
 /contracts/dev-utils/test/generated-wrappers
 /contracts/dev-utils/generated-artifacts
 /contracts/dev-utils/test/generated-artifacts
+/contracts/zero-ex/generated-wrappers
+/contracts/zero-ex/test/generated-wrappers
+/contracts/zero-ex/generated-artifacts
+/contracts/zero-ex/test/generated-artifacts
 /contracts/staking/build/
 /contracts/coordinator/build/
 /contracts/exchange/build/
@@ -91,3 +95,4 @@ packages/abi-gen/test-cli/fixtures/artifacts/AbiGenDummy.json
 packages/abi-gen/test-cli/fixtures/artifacts/LibDummy.json
 packages/abi-gen/test-cli/fixtures/artifacts/TestLibDummy.json
 packages/*/docs
+*.sol

contracts/asset-proxy/CHANGELOG.json

@@ -1,7 +1,94 @@
 [
+    {
+        "version": "3.3.0",
+        "changes": [
+            {
+                "note": "Use `LibERC20Token.approveIfBelow()` in DEX bridges for for approvals.",
+                "pr": 2512
+            },
+            {
+                "note": "Emit `ERC20BridgeTransfer` events in bridges.",
+                "pr": 2512
+            },
+            {
+                "note": "Change names of `ERC20BridgeTransfer` args to be less ambiguous.",
+                "pr": 2524
+            },
+            {
+                "note": "Added `MixinGasToken` allowing Gas Tokens to be freed",
+                "pr": 2523
+            },
+            {
+                "note": "Add `DexForwaderBridge` bridge contract.",
+                "pr": 2525
+            },
+            {
+                "note": "Add `UniswapV2Bridge` bridge contract.",
+                "pr": 2590
+            },
+            {
+                "note": "Add Gas Token freeing to `DexForwarderBridge` contract.",
+                "pr": 2536
+            }
+        ],
+        "timestamp": 1592969527
+    },
+    {
+        "timestamp": 1583220306,
+        "version": "3.2.5",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1582837861,
+        "version": "3.2.4",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1582677073,
+        "version": "3.2.3",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1582623685,
+        "version": "3.2.2",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1581748629,
+        "version": "3.2.1",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
     {
         "version": "3.2.0",
         "changes": [
+            {
+                "note": "Add more types and functions to `IDydx`",
+                "pr": 2466
+            },
+            {
+                "note": "Rename `DydxBrigeAction.accountId` to `DydxBridgeAction.accountIdx`",
+                "pr": 2466
+            },
             {
                 "note": "Fix broken tests.",
                 "pr": 2462
@@ -13,6 +100,10 @@
             {
                 "note": "Add asset data decoding functions",
                 "pr": 2462
+            },
+            {
+                "note": "Add `setOperators()` to `IDydx`",
+                "pr": 2462
             }
         ],
         "timestamp": 1581204851

contracts/asset-proxy/CHANGELOG.md

@@ -5,11 +5,44 @@ Edit the package's CHANGELOG.json file only.
 
 CHANGELOG
 
+## v3.3.0 - _June 24, 2020_
+
+    * Use `LibERC20Token.approveIfBelow()` in DEX bridges for for approvals. (#2512)
+    * Emit `ERC20BridgeTransfer` events in bridges. (#2512)
+    * Change names of `ERC20BridgeTransfer` args to be less ambiguous. (#2524)
+    * Added `MixinGasToken` allowing Gas Tokens to be freed (#2523)
+    * Add `DexForwaderBridge` bridge contract. (#2525)
+    * Add `UniswapV2Bridge` bridge contract. (#2590)
+    * Add Gas Token freeing to `DexForwarderBridge` contract. (#2536)
+
+## v3.2.5 - _March 3, 2020_
+
+    * Dependencies updated
+
+## v3.2.4 - _February 27, 2020_
+
+    * Dependencies updated
+
+## v3.2.3 - _February 26, 2020_
+
+    * Dependencies updated
+
+## v3.2.2 - _February 25, 2020_
+
+    * Dependencies updated
+
+## v3.2.1 - _February 15, 2020_
+
+    * Dependencies updated
+
 ## v3.2.0 - _February 8, 2020_
 
+    * Add more types and functions to `IDydx` (#2466)
+    * Rename `DydxBrigeAction.accountId` to `DydxBridgeAction.accountIdx` (#2466)
     * Fix broken tests. (#2462)
     * Remove dependency on `@0x/contracts-dev-utils` (#2462)
     * Add asset data decoding functions (#2462)
+    * Add `setOperators()` to `IDydx` (#2462)
 
 ## v3.1.3 - _February 6, 2020_
 

contracts/asset-proxy/compiler.json

@@ -3,6 +3,7 @@
     "contractsDir": "./contracts",
     "useDockerisedSolc": false,
     "isOfflineMode": false,
+    "shouldSaveStandardInput": true,
     "compilerSettings": {
         "evmVersion": "istanbul",
         "optimizer": {

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

@@ -35,7 +35,7 @@ contract ChaiBridge is
     /// @param from Address to transfer asset from.
     /// @param to Address to transfer asset to.
     /// @param amount Amount of asset to transfer.
-    /// @return success The magic bytes `0x37708e9b` if successful.
+    /// @return success The magic bytes `0xdc1600f3` if successful.
     function bridgeTransferFrom(
         address /* tokenAddress */,
         address from,

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

@@ -0,0 +1,128 @@
+
+/*
+
+  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/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/ICurve.sol";
+import "./MixinGasToken.sol";
+
+
+// solhint-disable not-rely-on-time
+// solhint-disable space-after-comma
+contract CurveBridge is
+    IERC20Bridge,
+    IWallet,
+    DeploymentConstants,
+    MixinGasToken
+{
+    struct CurveBridgeData {
+        address curveAddress;
+        int128 fromCoinIdx;
+        int128 toCoinIdx;
+        int128 version;
+    }
+
+    /// @dev Callback for `ICurve`. Tries to buy `amount` of
+    ///      `toTokenAddress` tokens by selling the entirety of the opposing asset
+    ///      (DAI, USDC) to the Curve contract, then transfers the bought
+    ///      tokens to `to`.
+    /// @param toTokenAddress The token to give to `to` (i.e DAI, USDC, USDT).
+    /// @param from The maker (this contract).
+    /// @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
+        freesGasTokensFromCollector
+        returns (bytes4 success)
+    {
+        // Decode the bridge data to get the Curve metadata.
+        CurveBridgeData memory data = abi.decode(bridgeData, (CurveBridgeData));
+
+        address fromTokenAddress = ICurve(data.curveAddress).underlying_coins(data.fromCoinIdx);
+        require(toTokenAddress != fromTokenAddress, "CurveBridge/INVALID_PAIR");
+        uint256 fromTokenBalance = IERC20Token(fromTokenAddress).balanceOf(address(this));
+        // Grant an allowance to the exchange to spend `fromTokenAddress` token.
+        LibERC20Token.approveIfBelow(fromTokenAddress, data.curveAddress, fromTokenBalance);
+
+        // Try to sell all of this contract's `fromTokenAddress` token balance.
+        if (data.version == 0) {
+            ICurve(data.curveAddress).exchange_underlying(
+                data.fromCoinIdx,
+                data.toCoinIdx,
+                // dx
+                fromTokenBalance,
+                // min dy
+                amount,
+                // expires
+                block.timestamp + 1
+            );
+        } else {
+            ICurve(data.curveAddress).exchange_underlying(
+                data.fromCoinIdx,
+                data.toCoinIdx,
+                // dx
+                fromTokenBalance,
+                // min dy
+                amount
+            );
+        }
+
+        uint256 toTokenBalance = IERC20Token(toTokenAddress).balanceOf(address(this));
+        // Transfer the converted `toToken`s to `to`.
+        LibERC20Token.transfer(toTokenAddress, to, toTokenBalance);
+
+        emit ERC20BridgeTransfer(
+            fromTokenAddress,
+            toTokenAddress,
+            fromTokenBalance,
+            toTokenBalance,
+            from,
+            to
+        );
+        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;
+    }
+}

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

@@ -0,0 +1,201 @@
+/*
+
+  Copyright 2020 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/LibERC20Token.sol";
+import "@0x/contracts-exchange-libs/contracts/src/IWallet.sol";
+import "@0x/contracts-exchange-libs/contracts/src/LibMath.sol";
+import "@0x/contracts-utils/contracts/src/DeploymentConstants.sol";
+import "@0x/contracts-utils/contracts/src/LibBytes.sol";
+import "@0x/contracts-utils/contracts/src/LibSafeMath.sol";
+import "../interfaces/IERC20Bridge.sol";
+import "./MixinGasToken.sol";
+
+
+// solhint-disable space-after-comma, indent
+contract DexForwarderBridge is
+    IERC20Bridge,
+    IWallet,
+    DeploymentConstants,
+    MixinGasToken
+{
+    using LibSafeMath for uint256;
+
+    /// @dev Data needed to reconstruct a bridge call.
+    struct BridgeCall {
+        address target;
+        uint256 inputTokenAmount;
+        uint256 outputTokenAmount;
+        bytes bridgeData;
+    }
+
+    /// @dev Intermediate state variables used by `bridgeTransferFrom()`, in
+    ///      struct form to get around stack limits.
+    struct TransferFromState {
+        address inputToken;
+        uint256 initialInputTokenBalance;
+        uint256 callInputTokenAmount;
+        uint256 callOutputTokenAmount;
+        uint256 totalInputTokenSold;
+        BridgeCall[] calls;
+    }
+
+    /// @dev Spends this contract's entire balance of input tokens by forwarding
+    /// them to other bridges. Reverts if the entire balance is not spent.
+    /// @param outputToken The token being bought.
+    /// @param to The recipient of the bought tokens.
+    /// @param bridgeData The abi-encoded input token address.
+    /// @return success The magic bytes if successful.
+    function bridgeTransferFrom(
+        address outputToken,
+        address /* from */,
+        address to,
+        uint256 /* amount */,
+        bytes calldata bridgeData
+    )
+        external
+        freesGasTokensFromCollector
+        returns (bytes4 success)
+    {
+        require(msg.sender == _getERC20BridgeProxyAddress(), "DexForwarderBridge/SENDER_NOT_AUTHORIZED");
+        TransferFromState memory state;
+        (
+            state.inputToken,
+            state.calls
+        ) = abi.decode(bridgeData, (address, BridgeCall[]));
+
+        state.initialInputTokenBalance = IERC20Token(state.inputToken).balanceOf(address(this));
+
+        for (uint256 i = 0; i < state.calls.length; ++i) {
+            // Stop if the we've sold all our input tokens.
+            if (state.totalInputTokenSold >= state.initialInputTokenBalance) {
+                break;
+            }
+
+            // Compute token amounts.
+            state.callInputTokenAmount = LibSafeMath.min256(
+                state.calls[i].inputTokenAmount,
+                state.initialInputTokenBalance.safeSub(state.totalInputTokenSold)
+            );
+            state.callOutputTokenAmount = LibMath.getPartialAmountFloor(
+                state.callInputTokenAmount,
+                state.calls[i].inputTokenAmount,
+                state.calls[i].outputTokenAmount
+            );
+
+            // Execute the call in a new context so we can recoup transferred
+            // funds by reverting.
+            (bool didSucceed, ) = address(this)
+                .call(abi.encodeWithSelector(
+                    this.executeBridgeCall.selector,
+                    state.calls[i].target,
+                    to,
+                    state.inputToken,
+                    outputToken,
+                    state.callInputTokenAmount,
+                    state.callOutputTokenAmount,
+                    state.calls[i].bridgeData
+                ));
+
+            if (didSucceed) {
+                // Increase the amount of tokens sold.
+                state.totalInputTokenSold = state.totalInputTokenSold.safeAdd(
+                    state.callInputTokenAmount
+                );
+            }
+        }
+        // Revert if we were not able to sell our entire input token balance.
+        require(
+            state.totalInputTokenSold >= state.initialInputTokenBalance,
+            "DexForwarderBridge/INCOMPLETE_FILL"
+        );
+        // Always succeed.
+        return BRIDGE_SUCCESS;
+    }
+
+    /// @dev Transfers `inputToken` token to a bridge contract then calls
+    ///      its `bridgeTransferFrom()`. This is executed in separate context
+    ///      so we can revert the transfer on error. This can only be called
+    //       by this contract itself.
+    /// @param bridge The bridge contract.
+    /// @param to The recipient of `outputToken` tokens.
+    /// @param inputToken The input token.
+    /// @param outputToken The output token.
+    /// @param inputTokenAmount The amount of input tokens to transfer to `bridge`.
+    /// @param outputTokenAmount The amount of expected output tokens to be sent
+    ///        to `to` by `bridge`.
+    function executeBridgeCall(
+        address bridge,
+        address to,
+        address inputToken,
+        address outputToken,
+        uint256 inputTokenAmount,
+        uint256 outputTokenAmount,
+        bytes calldata bridgeData
+    )
+        external
+    {
+        // Must be called through `bridgeTransferFrom()`.
+        require(msg.sender == address(this), "DexForwarderBridge/ONLY_SELF");
+        // `bridge` must not be this contract.
+        require(bridge != address(this));
+
+        // Get the starting balance of output tokens for `to`.
+        uint256 initialRecipientBalance = IERC20Token(outputToken).balanceOf(to);
+
+        // Transfer input tokens to the bridge.
+        LibERC20Token.transfer(inputToken, bridge, inputTokenAmount);
+
+        // Call the bridge.
+        (bool didSucceed, bytes memory resultData) =
+            bridge.call(abi.encodeWithSelector(
+                IERC20Bridge(0).bridgeTransferFrom.selector,
+                outputToken,
+                bridge,
+                to,
+                outputTokenAmount,
+                bridgeData
+            ));
+
+        // Revert if the call failed or not enough tokens were bought.
+        // This will also undo the token transfer.
+        require(
+            didSucceed
+            && resultData.length == 32
+            && LibBytes.readBytes32(resultData, 0) == bytes32(BRIDGE_SUCCESS)
+            && IERC20Token(outputToken).balanceOf(to).safeSub(initialRecipientBalance) >= outputTokenAmount
+        );
+    }
+
+    /// @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;
+    }
+}

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

@@ -50,7 +50,7 @@ contract DydxBridge is
     /// @param encodedBridgeData An abi-encoded `BridgeData` struct.
     /// @return success The magic bytes if successful.
     function bridgeTransferFrom(
-        address,
+        address, /* toTokenAddress */
         address from,
         address to,
         uint256 amount,
@@ -81,6 +81,7 @@ contract DydxBridge is
 
         // Run operation. This will revert on failure.
         IDydx(_getDydxAddress()).operate(accounts, actions);
+
         return BRIDGE_SUCCESS;
     }
 
@@ -191,12 +192,12 @@ contract DydxBridge is
         depositAction = IDydx.ActionArgs({
             actionType: IDydx.ActionType.Deposit,           // deposit tokens.
             amount: dydxAmount,                             // amount to deposit.
-            accountId: bridgeAction.accountId,              // index in the `accounts` when calling `operate`.
+            accountIdx: bridgeAction.accountIdx,             // index in the `accounts` when calling `operate`.
             primaryMarketId: bridgeAction.marketId,         // indicates which token to deposit.
             otherAddress: depositFrom,                      // deposit from the account owner.
             // unused parameters
             secondaryMarketId: 0,
-            otherAccountId: 0,
+            otherAccountIdx: 0,
             data: hex''
         });
     }
@@ -229,12 +230,12 @@ contract DydxBridge is
         withdrawAction = IDydx.ActionArgs({
             actionType: IDydx.ActionType.Withdraw,          // withdraw tokens.
             amount: amountToWithdraw,                       // amount to withdraw.
-            accountId: bridgeAction.accountId,              // index in the `accounts` when calling `operate`.
+            accountIdx: bridgeAction.accountIdx,            // index in the `accounts` when calling `operate`.
             primaryMarketId: bridgeAction.marketId,         // indicates which token to withdraw.
             otherAddress: withdrawTo,                       // withdraw tokens to this address.
             // unused parameters
             secondaryMarketId: 0,
-            otherAccountId: 0,
+            otherAccountIdx: 0,
             data: hex''
         });
     }

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

@@ -38,13 +38,14 @@ contract Eth2DaiBridge is
     ///      (DAI or WETH) to the Eth2Dai contract, then transfers the bought
     ///      tokens to `to`.
     /// @param toTokenAddress The token to give to `to` (either DAI or WETH).
+    /// @param from The maker (this contract).
     /// @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 from,
         address to,
         uint256 amount,
         bytes calldata bridgeData
@@ -56,18 +57,28 @@ contract Eth2DaiBridge is
         (address fromTokenAddress) = abi.decode(bridgeData, (address));
 
         IEth2Dai exchange = IEth2Dai(_getEth2DaiAddress());
+        uint256 fromTokenBalance = IERC20Token(fromTokenAddress).balanceOf(address(this));
         // Grant an allowance to the exchange to spend `fromTokenAddress` token.
-        LibERC20Token.approve(fromTokenAddress, address(exchange), uint256(-1));
+        LibERC20Token.approveIfBelow(fromTokenAddress, address(exchange), fromTokenBalance);
 
         // Try to sell all of this contract's `fromTokenAddress` token balance.
         uint256 boughtAmount = exchange.sellAllAmount(
             fromTokenAddress,
-            IERC20Token(fromTokenAddress).balanceOf(address(this)),
+            fromTokenBalance,
             toTokenAddress,
             amount
         );
         // Transfer the converted `toToken`s to `to`.
         LibERC20Token.transfer(toTokenAddress, to, boughtAmount);
+
+        emit ERC20BridgeTransfer(
+            fromTokenAddress,
+            toTokenAddress,
+            fromTokenBalance,
+            boughtAmount,
+            from,
+            to
+        );
         return BRIDGE_SUCCESS;
     }
 

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

@@ -66,13 +66,14 @@ contract KyberBridge is
     ///      to the `KyberNetworkProxy` contract, then transfers the bought
     ///      tokens to `to`.
     /// @param toTokenAddress The token to give to `to`.
+    /// @param from The maker (this contract).
     /// @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 from,
         address to,
         uint256 amount,
         bytes calldata bridgeData
@@ -109,7 +110,11 @@ contract KyberBridge is
         } 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));
+            LibERC20Token.approveIfBelow(
+                state.fromTokenAddress,
+                address(state.kyber),
+                state.fromTokenBalance
+            );
         } else {
             // If the input token is WETH, unwrap it and attach it to the call.
             state.fromTokenAddress = KYBER_ETH_ADDRESS;
@@ -143,6 +148,15 @@ contract KyberBridge is
             state.weth.deposit.value(boughtAmount)();
             state.weth.transfer(to, boughtAmount);
         }
+
+        emit ERC20BridgeTransfer(
+            state.fromTokenAddress == KYBER_ETH_ADDRESS ? address(state.weth) : state.fromTokenAddress,
+            toTokenAddress,
+            state.fromTokenBalance,
+            boughtAmount,
+            from,
+            to
+        );
         return BRIDGE_SUCCESS;
     }
 

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

@@ -0,0 +1,55 @@
+/*
+
+  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 ^0.5.16;
+
+import "@0x/contracts-utils/contracts/src/DeploymentConstants.sol";
+import "../interfaces/IGasToken.sol";
+
+
+contract MixinGasToken is
+    DeploymentConstants
+{
+
+    /// @dev Frees gas tokens based on the amount of gas consumed in the function
+    modifier freesGasTokens {
+        uint256 gasBefore = gasleft();
+        _;
+        IGasToken gst = IGasToken(_getGstAddress());
+        if (address(gst) != address(0)) {
+            // (gasUsed + FREE_BASE) / (2 * REIMBURSE - FREE_TOKEN)
+            //            14154             24000        6870
+            uint256 value = (gasBefore - gasleft() + 14154) / 41130;
+            gst.freeUpTo(value);
+        }
+    }
+
+    /// @dev Frees gas tokens using the balance of `from`. Amount freed is based
+    ///     on the gas consumed in the function
+    modifier freesGasTokensFromCollector() {
+        uint256 gasBefore = gasleft();
+        _;
+        IGasToken gst = IGasToken(_getGstAddress());
+        if (address(gst) != address(0)) {
+            // (gasUsed + FREE_BASE) / (2 * REIMBURSE - FREE_TOKEN)
+            //            14154             24000        6870
+            uint256 value = (gasBefore - gasleft() + 14154) / 41130;
+            gst.freeFromUpTo(_getGstCollectorAddress(), value);
+        }
+    }
+}

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

@@ -38,10 +38,11 @@ contract UniswapBridge is
 {
     // Struct to hold `bridgeTransferFrom()` local variables in memory and to avoid
     // stack overflows.
-    struct WithdrawToState {
+    struct TransferState {
         IUniswapExchange exchange;
         uint256 fromTokenBalance;
         IEtherToken weth;
+        uint256 boughtAmount;
     }
 
     // solhint-disable no-empty-blocks
@@ -55,13 +56,14 @@ contract UniswapBridge is
     ///      `toTokenAddress` tokens by selling the entirety of the `fromTokenAddress`
     ///      token encoded in the bridge data.
     /// @param toTokenAddress The token to buy and transfer to `to`.
+    /// @param from The maker (this contract).
     /// @param to The recipient of the bought tokens.
     /// @param amount Minimum amount of `toTokenAddress` tokens to buy.
     /// @param bridgeData The abi-encoded "from" token address.
     /// @return success The magic bytes if successful.
     function bridgeTransferFrom(
         address toTokenAddress,
-        address /* from */,
+        address from,
         address to,
         uint256 amount,
         bytes calldata bridgeData
@@ -70,7 +72,7 @@ contract UniswapBridge is
         returns (bytes4 success)
     {
         // State memory object to avoid stack overflows.
-        WithdrawToState memory state;
+        TransferState memory state;
         // Decode the bridge data to get the `fromTokenAddress`.
         (address fromTokenAddress) = abi.decode(bridgeData, (address));
 
@@ -96,7 +98,7 @@ contract UniswapBridge is
             state.weth.withdraw(state.fromTokenBalance);
             // Buy as much of `toTokenAddress` token with ETH as possible and
             // transfer it to `to`.
-            state.exchange.ethToTokenTransferInput.value(state.fromTokenBalance)(
+            state.boughtAmount = state.exchange.ethToTokenTransferInput.value(state.fromTokenBalance)(
                 // Minimum buy amount.
                 amount,
                 // Expires after this block.
@@ -108,9 +110,9 @@ contract UniswapBridge is
         // Convert from a token to WETH.
         } else if (toTokenAddress == address(state.weth)) {
             // Grant the exchange an allowance.
-            _grantExchangeAllowance(state.exchange, fromTokenAddress);
+            _grantExchangeAllowance(state.exchange, fromTokenAddress, state.fromTokenBalance);
             // Buy as much ETH with `fromTokenAddress` token as possible.
-            uint256 ethBought = state.exchange.tokenToEthSwapInput(
+            state.boughtAmount = state.exchange.tokenToEthSwapInput(
                 // Sell all tokens we hold.
                 state.fromTokenBalance,
                 // Minimum buy amount.
@@ -119,17 +121,17 @@ contract UniswapBridge is
                 block.timestamp
             );
             // Wrap the ETH.
-            state.weth.deposit.value(ethBought)();
+            state.weth.deposit.value(state.boughtAmount)();
             // Transfer the WETH to `to`.
-            IEtherToken(toTokenAddress).transfer(to, ethBought);
+            IEtherToken(toTokenAddress).transfer(to, state.boughtAmount);
 
         // Convert from one token to another.
         } else {
             // Grant the exchange an allowance.
-            _grantExchangeAllowance(state.exchange, fromTokenAddress);
+            _grantExchangeAllowance(state.exchange, fromTokenAddress, state.fromTokenBalance);
             // Buy as much `toTokenAddress` token with `fromTokenAddress` token
             // and transfer it to `to`.
-            state.exchange.tokenToTokenTransferInput(
+            state.boughtAmount = state.exchange.tokenToTokenTransferInput(
                 // Sell all tokens we hold.
                 state.fromTokenBalance,
                 // Minimum buy amount.
@@ -144,6 +146,15 @@ contract UniswapBridge is
                 toTokenAddress
             );
         }
+
+        emit ERC20BridgeTransfer(
+            fromTokenAddress,
+            toTokenAddress,
+            state.fromTokenBalance,
+            state.boughtAmount,
+            from,
+            to
+        );
         return BRIDGE_SUCCESS;
     }
 
@@ -165,10 +176,19 @@ contract UniswapBridge is
     ///      on behalf of this contract.
     /// @param exchange The Uniswap token exchange.
     /// @param tokenAddress The token address for the exchange.
-    function _grantExchangeAllowance(IUniswapExchange exchange, address tokenAddress)
+    /// @param minimumAllowance The minimum necessary allowance.
+    function _grantExchangeAllowance(
+        IUniswapExchange exchange,
+        address tokenAddress,
+        uint256 minimumAllowance
+    )
         private
     {
-        LibERC20Token.approve(tokenAddress, address(exchange), uint256(-1));
+        LibERC20Token.approveIfBelow(
+            tokenAddress,
+            address(exchange),
+            minimumAllowance
+        );
     }
 
     /// @dev Retrieves the uniswap exchange for a given token pair.

contracts/asset-proxy/contracts/src/bridges/UniswapV2Bridge.sol

@@ -0,0 +1,135 @@
+/*
+
+  Copyright 2020 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/LibAddressArray.sol";
+import "@0x/contracts-utils/contracts/src/DeploymentConstants.sol";
+import "../interfaces/IUniswapV2Router01.sol";
+import "../interfaces/IERC20Bridge.sol";
+
+
+// solhint-disable space-after-comma
+// solhint-disable not-rely-on-time
+contract UniswapV2Bridge is
+    IERC20Bridge,
+    IWallet,
+    DeploymentConstants
+{
+    struct TransferState {
+        address[] path;
+        uint256 fromTokenBalance;
+    }
+
+    /// @dev Callback for `IERC20Bridge`. Tries to buy `amount` of
+    ///      `toTokenAddress` tokens by selling the entirety of the `fromTokenAddress`
+    ///      token encoded in the bridge data.
+    /// @param toTokenAddress The token to buy and transfer to `to`.
+    /// @param from The maker (this contract).
+    /// @param to The recipient of the bought tokens.
+    /// @param amount Minimum amount of `toTokenAddress` tokens to buy.
+    /// @param bridgeData The abi-encoded path of token addresses. Last element must be toTokenAddress
+    /// @return success The magic bytes if successful.
+    function bridgeTransferFrom(
+        address toTokenAddress,
+        address from,
+        address to,
+        uint256 amount,
+        bytes calldata bridgeData
+    )
+        external
+        returns (bytes4 success)
+    {
+        // hold variables to get around stack depth limitations
+        TransferState memory state;
+
+        // Decode the bridge data to get the `fromTokenAddress`.
+        // solhint-disable indent
+        state.path = abi.decode(bridgeData, (address[]));
+        // solhint-enable indent
+
+        require(state.path.length >= 2, "UniswapV2Bridge/PATH_LENGTH_MUST_BE_AT_LEAST_TWO");
+        require(state.path[state.path.length - 1] == toTokenAddress, "UniswapV2Bridge/LAST_ELEMENT_OF_PATH_MUST_MATCH_OUTPUT_TOKEN");
+
+        // Just transfer the tokens if they're the same.
+        if (state.path[0] == toTokenAddress) {
+            LibERC20Token.transfer(state.path[0], to, amount);
+            return BRIDGE_SUCCESS;
+        }
+
+        // Get our balance of `fromTokenAddress` token.
+        state.fromTokenBalance = IERC20Token(state.path[0]).balanceOf(address(this));
+
+        // Grant the Uniswap router an allowance.
+        LibERC20Token.approveIfBelow(
+            state.path[0],
+            _getUniswapV2Router01Address(),
+            state.fromTokenBalance
+        );
+
+        // Buy as much `toTokenAddress` token with `fromTokenAddress` token
+        // and transfer it to `to`.
+        IUniswapV2Router01 router = IUniswapV2Router01(_getUniswapV2Router01Address());
+        uint[] memory amounts = router.swapExactTokensForTokens(
+             // Sell all tokens we hold.
+            state.fromTokenBalance,
+             // Minimum buy amount.
+            amount,
+            // Convert `fromTokenAddress` to `toTokenAddress`.
+            state.path,
+            // Recipient is `to`.
+            to,
+            // Expires after this block.
+            block.timestamp
+        );
+
+        emit ERC20BridgeTransfer(
+            // input token
+            state.path[0],
+            // output token
+            toTokenAddress,
+            // input token amount
+            state.fromTokenBalance,
+            // output token amount
+            amounts[amounts.length - 1],
+            from,
+            to
+        );
+
+        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 Success bytes, always.
+    function isValidSignature(
+        bytes32,
+        bytes calldata
+    )
+        external
+        view
+        returns (bytes4 magicValue)
+    {
+        return LEGACY_WALLET_MAGIC_VALUE;
+    }
+}

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

@@ -0,0 +1,86 @@
+/*
+
+  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;
+
+
+// solhint-disable func-name-mixedcase
+interface ICurve {
+
+    /// @dev Sell `sellAmount` of `fromToken` token and receive `toToken` token.
+    ///      This function exists on early versions of Curve (USDC/DAI)
+    /// @param i The token index being sold.
+    /// @param j The token index being bought.
+    /// @param sellAmount The amount of token being bought.
+    /// @param minBuyAmount The minimum buy amount of the token being bought.
+    /// @param deadline The time in seconds when this operation should expire.
+    function exchange_underlying(
+        int128 i,
+        int128 j,
+        uint256 sellAmount,
+        uint256 minBuyAmount,
+        uint256 deadline
+    )
+        external;
+
+    /// @dev Sell `sellAmount` of `fromToken` token and receive `toToken` token.
+    ///      This function exists on later versions of Curve (USDC/DAI/USDT)
+    /// @param i The token index being sold.
+    /// @param j The token index being bought.
+    /// @param sellAmount The amount of token being bought.
+    /// @param minBuyAmount The minimum buy amount of the token being bought.
+    function exchange_underlying(
+        int128 i,
+        int128 j,
+        uint256 sellAmount,
+        uint256 minBuyAmount
+    )
+        external;
+
+    /// @dev Get the amount of `toToken` by selling `sellAmount` of `fromToken`
+    /// @param i The token index being sold.
+    /// @param j The token index being bought.
+    /// @param sellAmount The amount of token being bought.
+    function get_dy_underlying(
+        int128 i,
+        int128 j,
+        uint256 sellAmount
+    )
+        external
+        returns (uint256 dy);
+
+    /// @dev Get the amount of `fromToken` by buying `buyAmount` of `toToken`
+    /// @param i The token index being sold.
+    /// @param j The token index being bought.
+    /// @param buyAmount The amount of token being bought.
+    function get_dx_underlying(
+        int128 i,
+        int128 j,
+        uint256 buyAmount
+    )
+        external
+        returns (uint256 dx);
+
+    /// @dev Get the underlying token address from the token index
+    /// @param i The token index.
+    function underlying_coins(
+        int128 i
+    )
+        external
+        returns (address tokenAddress);
+}

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

@@ -45,12 +45,12 @@ interface IDydx {
     /// parsed into before being processed.
     struct ActionArgs {
         ActionType actionType;
-        uint256 accountId;
+        uint256 accountIdx;
         AssetAmount amount;
         uint256 primaryMarketId;
         uint256 secondaryMarketId;
         address otherAddress;
-        uint256 otherAccountId;
+        uint256 otherAccountIdx;
         bytes data;
     }
 
@@ -71,6 +71,36 @@ interface IDydx {
         uint256 value;
     }
 
+    struct D256 {
+        uint256 value;
+    }
+
+    struct Value {
+        uint256 value;
+    }
+
+    struct Price {
+        uint256 value;
+    }
+
+    struct OperatorArg {
+        address operator;
+        bool trusted;
+    }
+
+    /// @dev The global risk parameters that govern the health and security of the system
+    struct RiskParams {
+        // Required ratio of over-collateralization
+        D256 marginRatio;
+        // Percentage penalty incurred by liquidated accounts
+        D256 liquidationSpread;
+        // Percentage of the borrower's interest fee that gets passed to the suppliers
+        D256 earningsRate;
+        // The minimum absolute borrow value of an account
+        // There must be sufficient incentivize to liquidate undercollateralized accounts
+        Value minBorrowedValue;
+    }
+
     /// @dev The main entry-point to Solo that allows users and contracts to manage accounts.
     ///      Take one or more actions on one or more accounts. The msg.sender must be the owner or
     ///      operator of all accounts except for those being liquidated, vaporized, or traded with.
@@ -86,4 +116,77 @@ interface IDydx {
         ActionArgs[] calldata actions
     )
         external;
+
+    // @dev Approves/disapproves any number of operators. An operator is an external address that has the
+    //      same permissions to manipulate an account as the owner of the account. Operators are simply
+    //      addresses and therefore may either be externally-owned Ethereum accounts OR smart contracts.
+    //      Operators are also able to act as AutoTrader contracts on behalf of the account owner if the
+    //      operator is a smart contract and implements the IAutoTrader interface.
+    // @param args A list of OperatorArgs which have an address and a boolean. The boolean value
+    //        denotes whether to approve (true) or revoke approval (false) for that address.
+    function setOperators(OperatorArg[] calldata args) external;
+
+    /// @dev Return true if a particular address is approved as an operator for an owner's accounts.
+    ///      Approved operators can act on the accounts of the owner as if it were the operator's own.
+    /// @param owner The owner of the accounts
+    /// @param operator The possible operator
+    /// @return isLocalOperator True if operator is approved for owner's accounts
+    function getIsLocalOperator(
+        address owner,
+        address operator
+    )
+        external
+        view
+        returns (bool isLocalOperator);
+
+    /// @dev Get the ERC20 token address for a market.
+    /// @param marketId The market to query
+    /// @return tokenAddress The token address
+    function getMarketTokenAddress(
+        uint256 marketId
+    )
+        external
+        view
+        returns (address tokenAddress);
+
+    /// @dev Get all risk parameters in a single struct.
+    /// @return riskParams All global risk parameters
+    function getRiskParams()
+        external
+        view
+        returns (RiskParams memory riskParams);
+
+    /// @dev Get the price of the token for a market.
+    /// @param marketId The market to query
+    /// @return price The price of each atomic unit of the token
+    function getMarketPrice(
+        uint256 marketId
+    )
+        external
+        view
+        returns (Price memory price);
+
+    /// @dev Get the margin premium for a market. A margin premium makes it so that any positions that
+    ///      include the market require a higher collateralization to avoid being liquidated.
+    /// @param  marketId  The market to query
+    /// @return premium The market's margin premium
+    function getMarketMarginPremium(uint256 marketId)
+        external
+        view
+        returns (D256 memory premium);
+
+    /// @dev Get the total supplied and total borrowed values of an account adjusted by the marginPremium
+    ///      of each market. Supplied values are divided by (1 + marginPremium) for each market and
+    ///      borrowed values are multiplied by (1 + marginPremium) for each market. Comparing these
+    ///      adjusted values gives the margin-ratio of the account which will be compared to the global
+    ///      margin-ratio when determining if the account can be liquidated.
+    /// @param account The account to query
+    /// @return supplyValue The supplied value of the account (adjusted for marginPremium)
+    /// @return borrowValue The borrowed value of the account (adjusted for marginPremium)
+    function getAdjustedAccountValues(
+        AccountInfo calldata account
+    )
+        external
+        view
+        returns (Value memory supplyValue, Value memory borrowValue);
 }

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

@@ -29,7 +29,7 @@ interface IDydxBridge {
 
     struct BridgeAction {
         BridgeActionType actionType;            // Action to run on dydx account.
-        uint256 accountId;                      // Index in `BridgeData.accountNumbers` for this action.
+        uint256 accountIdx;                     // Index in `BridgeData.accountNumbers` for this action.
         uint256 marketId;                       // Market to operate on.
         uint256 conversionRateNumerator;        // Optional. If set, transfer amount is scaled by (conversionRateNumerator/conversionRateDenominator).
         uint256 conversionRateDenominator;      // Optional. If set, transfer amount is scaled by (conversionRateNumerator/conversionRateDenominator).
@@ -39,4 +39,4 @@ interface IDydxBridge {
         uint256[] accountNumbers;               // Account number used to identify the owner's specific account.
         BridgeAction[] actions;                 // Actions to carry out on the owner's accounts.
     }
-}
+}

contracts/asset-proxy/contracts/src/interfaces/IERC20Bridge.sol

@@ -21,16 +21,32 @@ pragma solidity ^0.5.9;
 
 contract IERC20Bridge {
 
-    // @dev Result of a successful bridge call.
+    /// @dev Result of a successful bridge call.
     bytes4 constant internal BRIDGE_SUCCESS = 0xdc1600f3;
 
+    /// @dev Emitted when a trade occurs.
+    /// @param inputToken The token the bridge is converting from.
+    /// @param outputToken The token the bridge is converting to.
+    /// @param inputTokenAmount Amount of input token.
+    /// @param outputTokenAmount Amount of output token.
+    /// @param from The `from` address in `bridgeTransferFrom()`
+    /// @param to The `to` address in `bridgeTransferFrom()`
+    event ERC20BridgeTransfer(
+        address inputToken,
+        address outputToken,
+        uint256 inputTokenAmount,
+        uint256 outputTokenAmount,
+        address from,
+        address to
+    );
+
     /// @dev Transfers `amount` of the ERC20 `tokenAddress` from `from` to `to`.
     /// @param tokenAddress The address of the ERC20 token to transfer.
     /// @param from Address to transfer asset from.
     /// @param to Address to transfer asset to.
     /// @param amount Amount of asset to transfer.
     /// @param bridgeData Arbitrary asset data needed by the bridge contract.
-    /// @return success The magic bytes `0x37708e9b` if successful.
+    /// @return success The magic bytes `0xdc1600f3` if successful.
     function bridgeTransferFrom(
         address tokenAddress,
         address from,

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

@@ -0,0 +1,40 @@
+/*
+
+  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 ^0.5.15;
+
+import "@0x/contracts-erc20/contracts/src/interfaces/IERC20Token.sol";
+
+
+contract IGasToken is IERC20Token {
+
+    /// @dev Frees up to `value` sub-tokens
+    /// @param value The amount of tokens to free
+    /// @return How many tokens were freed
+    function freeUpTo(uint256 value) external returns (uint256 freed);
+
+    /// @dev Frees up to `value` sub-tokens owned by `from`
+    /// @param from The owner of tokens to spend
+    /// @param value The amount of tokens to free
+    /// @return How many tokens were freed
+    function freeFromUpTo(address from, uint256 value) external returns (uint256 freed);
+
+    /// @dev Mints `value` amount of tokens
+    /// @param value The amount of tokens to mint
+    function mint(uint256 value) external;
+}

contracts/asset-proxy/contracts/src/interfaces/IUniswapV2Router01.sol

@@ -0,0 +1,40 @@
+/*
+
+  Copyright 2020 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 IUniswapV2Router01 {
+
+    /// @dev Swaps an exact amount of input tokens for as many output tokens as possible, along the route determined by the path.
+    ///      The first element of path is the input token, the last is the output token, and any intermediate elements represent
+    ///      intermediate pairs to trade through (if, for example, a direct pair does not exist).
+    /// @param amountIn The amount of input tokens to send.
+    /// @param amountOutMin The minimum amount of output tokens that must be received for the transaction not to revert.
+    /// @param path An array of token addresses. path.length must be >= 2. Pools for each consecutive pair of addresses must exist and have liquidity.
+    /// @param to Recipient of the output tokens.
+    /// @param deadline Unix timestamp after which the transaction will revert.
+    /// @return amounts The input token amount and all subsequent output token amounts.
+    function swapExactTokensForTokens(
+        uint amountIn,
+        uint amountOutMin,
+        address[] calldata path,
+        address to,
+        uint deadline
+    ) external returns (uint[] memory amounts);
+}

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

@@ -0,0 +1,244 @@
+/*
+
+  Copyright 2020 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/bridges/DexForwarderBridge.sol";
+import "@0x/contracts-utils/contracts/src/LibSafeMath.sol";
+
+
+interface ITestDexForwarderBridge {
+    event BridgeTransferFromCalled(
+        address caller,
+        uint256 inputTokenBalance,
+        address inputToken,
+        address outputToken,
+        address from,
+        address to,
+        uint256 amount
+    );
+
+    event TokenTransferCalled(
+        address from,
+        address to,
+        uint256 amount
+    );
+
+    function emitBridgeTransferFromCalled(
+        address caller,
+        uint256 inputTokenBalance,
+        address inputToken,
+        address outputToken,
+        address from,
+        address to,
+        uint256 amount
+    ) external;
+
+    function emitTokenTransferCalled(
+        address from,
+        address to,
+        uint256 amount
+    ) external;
+}
+
+
+interface ITestDexForwarderBridgeTestToken {
+
+    function transfer(address to, uint256 amount)
+        external
+        returns (bool);
+
+    function mint(address to, uint256 amount)
+        external;
+
+    function balanceOf(address owner) external view returns (uint256);
+}
+
+
+contract TestDexForwarderBridgeTestBridge {
+
+    bytes4 private _returnCode;
+    string private _revertError;
+    uint256 private _transferAmount;
+    ITestDexForwarderBridge private _testContract;
+
+    constructor(bytes4 returnCode, string memory revertError) public {
+        _testContract = ITestDexForwarderBridge(msg.sender);
+        _returnCode = returnCode;
+        _revertError = revertError;
+    }
+
+    function setTransferAmount(uint256 amount) external {
+        _transferAmount = amount;
+    }
+
+    function bridgeTransferFrom(
+        address outputToken,
+        address from,
+        address to,
+        uint256 amount,
+        bytes memory bridgeData
+    )
+        public
+        returns (bytes4 success)
+    {
+        if (bytes(_revertError).length != 0) {
+            revert(_revertError);
+        }
+        address inputToken = abi.decode(bridgeData, (address));
+        _testContract.emitBridgeTransferFromCalled(
+            msg.sender,
+            ITestDexForwarderBridgeTestToken(inputToken).balanceOf(address(this)),
+            inputToken,
+            outputToken,
+            from,
+            to,
+            amount
+        );
+        ITestDexForwarderBridgeTestToken(outputToken).mint(to, _transferAmount);
+        return _returnCode;
+    }
+}
+
+
+contract TestDexForwarderBridgeTestToken {
+
+    using LibSafeMath for uint256;
+
+    mapping(address => uint256) public balanceOf;
+    ITestDexForwarderBridge private _testContract;
+
+    constructor() public {
+        _testContract = ITestDexForwarderBridge(msg.sender);
+    }
+
+    function transfer(address to, uint256 amount)
+        external
+        returns (bool)
+    {
+        balanceOf[msg.sender] = balanceOf[msg.sender].safeSub(amount);
+        balanceOf[to] = balanceOf[to].safeAdd(amount);
+        _testContract.emitTokenTransferCalled(msg.sender, to, amount);
+        return true;
+    }
+
+    function mint(address owner, uint256 amount)
+        external
+    {
+        balanceOf[owner] = balanceOf[owner].safeAdd(amount);
+    }
+
+    function setBalance(address owner, uint256 amount)
+        external
+    {
+        balanceOf[owner] = amount;
+    }
+}
+
+
+contract TestDexForwarderBridge is
+    ITestDexForwarderBridge,
+    DexForwarderBridge
+{
+    address private AUTHORIZED_ADDRESS; // solhint-disable-line var-name-mixedcase
+
+    function setAuthorized(address authorized)
+        public
+    {
+        AUTHORIZED_ADDRESS = authorized;
+    }
+
+    function createBridge(
+        bytes4 returnCode,
+        string memory revertError
+    )
+        public
+        returns (address bridge)
+    {
+        return address(new TestDexForwarderBridgeTestBridge(returnCode, revertError));
+    }
+
+    function createToken() public returns (address token) {
+        return address(new TestDexForwarderBridgeTestToken());
+    }
+
+    function setTokenBalance(address token, address owner, uint256 amount) public {
+        TestDexForwarderBridgeTestToken(token).setBalance(owner, amount);
+    }
+
+    function setBridgeTransferAmount(address bridge, uint256 amount) public {
+        TestDexForwarderBridgeTestBridge(bridge).setTransferAmount(amount);
+    }
+
+    function emitBridgeTransferFromCalled(
+        address caller,
+        uint256 inputTokenBalance,
+        address inputToken,
+        address outputToken,
+        address from,
+        address to,
+        uint256 amount
+    )
+        public
+    {
+        emit BridgeTransferFromCalled(
+            caller,
+            inputTokenBalance,
+            inputToken,
+            outputToken,
+            from,
+            to,
+            amount
+        );
+    }
+
+    function emitTokenTransferCalled(
+        address from,
+        address to,
+        uint256 amount
+    )
+        public
+    {
+        emit TokenTransferCalled(
+            from,
+            to,
+            amount
+        );
+    }
+
+    function balanceOf(address token, address owner) public view returns (uint256) {
+        return TestDexForwarderBridgeTestToken(token).balanceOf(owner);
+    }
+
+    function _getGstAddress()
+        internal
+        view
+        returns (address gst)
+    {
+        return address(0);
+    }
+
+    function _getERC20BridgeProxyAddress()
+        internal
+        view
+        returns (address erc20BridgeProxyAddress)
+    {
+        return AUTHORIZED_ADDRESS;
+    }
+}

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

@@ -23,6 +23,7 @@ import "@0x/contracts-erc20/contracts/src/interfaces/IERC20Token.sol";
 import "../src/bridges/DydxBridge.sol";
 
 
+// solhint-disable no-empty-blocks
 contract TestDydxBridgeToken {
 
     uint256 private constant INIT_HOLDER_BALANCE = 10 * 10**18; // 10 tokens
@@ -79,7 +80,7 @@ contract TestDydxBridge is
 
     event OperateAction(
         ActionType actionType,
-        uint256 accountId,
+        uint256 accountIdx,
         bool amountSign,
         AssetDenomination amountDenomination,
         AssetReference amountRef,
@@ -120,7 +121,7 @@ contract TestDydxBridge is
         for (uint i = 0; i < actions.length; ++i) {
             emit OperateAction(
                 actions[i].actionType,
-                actions[i].accountId,
+                actions[i].accountIdx,
                 actions[i].amount.sign,
                 actions[i].amount.denomination,
                 actions[i].amount.ref,
@@ -128,7 +129,7 @@ contract TestDydxBridge is
                 actions[i].primaryMarketId,
                 actions[i].secondaryMarketId,
                 actions[i].otherAddress,
-                actions[i].otherAccountId,
+                actions[i].otherAccountIdx,
                 actions[i].data
             );
 
@@ -171,6 +172,60 @@ contract TestDydxBridge is
         return _testTokenAddress;
     }
 
+    /// @dev Unused.
+    function setOperators(OperatorArg[] calldata args) external {}
+
+    /// @dev Unused.
+    function getIsLocalOperator(
+        address owner,
+        address operator
+    )
+        external
+        view
+        returns (bool isLocalOperator)
+    {}
+
+    /// @dev Unused.
+    function getMarketTokenAddress(
+        uint256 marketId
+    )
+        external
+        view
+        returns (address tokenAddress)
+    {}
+
+    /// @dev Unused.
+    function getRiskParams()
+        external
+        view
+        returns (RiskParams memory riskParams)
+    {}
+
+    /// @dev Unsused.
+    function getMarketPrice(
+        uint256 marketId
+    )
+        external
+        view
+        returns (Price memory price)
+    {}
+
+    /// @dev Unsused
+    function getMarketMarginPremium(uint256 marketId)
+        external
+        view
+        returns (IDydx.D256 memory premium)
+    {}
+
+    /// @dev Unused.
+    function getAdjustedAccountValues(
+        AccountInfo calldata account
+    )
+        external
+        view
+        returns (Value memory supplyValue, Value memory borrowValue)
+    {}
+
     /// @dev overrides `_getDydxAddress()` from `DeploymentConstants` to return this address.
     function _getDydxAddress()
         internal
@@ -188,4 +243,4 @@ contract TestDydxBridge is
     {
         return msg.sender == ALWAYS_REVERT_ADDRESS ? address(0) : msg.sender;
     }
-}
+}

contracts/asset-proxy/contracts/test/TestEth2DaiBridge.sol

@@ -110,6 +110,10 @@ contract TestToken {
         return true;
     }
 
+    function allowance(address, address) external view returns (uint256) {
+        return 0;
+    }
+
     /// @dev Retrieve the balance for `owner`.
     function balanceOf(address owner)
         external

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

@@ -110,6 +110,10 @@ contract TestToken {
         return _testContract.wethDeposit.value(msg.value)(msg.sender);
     }
 
+    function allowance(address, address) external view returns (uint256) {
+        return 0;
+    }
+
     function balanceOf(address owner)
         external
         view

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

@@ -224,6 +224,10 @@ contract TestToken {
         TestEventsRaiser(msg.sender).raiseWethWithdraw(amount);
     }
 
+    function allowance(address, address) external view returns (uint256) {
+        return 0;
+    }
+
     /// @dev Retrieve the balance for `owner`.
     function balanceOf(address owner)
         external

contracts/asset-proxy/contracts/test/TestUniswapV2Bridge.sol

@@ -0,0 +1,253 @@
+/*
+
+  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-utils/contracts/src/LibSafeMath.sol";
+import "@0x/contracts-utils/contracts/src/LibAddressArray.sol";
+import "../src/bridges/UniswapV2Bridge.sol";
+import "../src/interfaces/IUniswapV2Router01.sol";
+
+
+contract TestEventsRaiser {
+
+    event TokenTransfer(
+        address token,
+        address from,
+        address to,
+        uint256 amount
+    );
+
+    event TokenApprove(
+        address spender,
+        uint256 allowance
+    );
+
+    event SwapExactTokensForTokensInput(
+        uint amountIn,
+        uint amountOutMin,
+        address toTokenAddress,
+        address to,
+        uint deadline
+    );
+
+    function raiseTokenTransfer(
+        address from,
+        address to,
+        uint256 amount
+    )
+        external
+    {
+        emit TokenTransfer(
+            msg.sender,
+            from,
+            to,
+            amount
+        );
+    }
+
+    function raiseTokenApprove(address spender, uint256 allowance) external {
+        emit TokenApprove(spender, allowance);
+    }
+
+    function raiseSwapExactTokensForTokensInput(
+        uint amountIn,
+        uint amountOutMin,
+        address toTokenAddress,
+        address to,
+        uint deadline
+    ) external
+    {
+        emit SwapExactTokensForTokensInput(
+            amountIn,
+            amountOutMin,
+            toTokenAddress,
+            to,
+            deadline
+        );
+    }
+}
+
+
+/// @dev A minimalist ERC20 token.
+contract TestToken {
+
+    using LibSafeMath for uint256;
+
+    mapping (address => uint256) public balances;
+    string private _nextRevertReason;
+
+    /// @dev Set the balance for `owner`.
+    function setBalance(address owner, uint256 balance)
+        external
+        payable
+    {
+        balances[owner] = balance;
+    }
+
+    /// @dev Just emits a TokenTransfer event on the caller
+    function transfer(address to, uint256 amount)
+        external
+        returns (bool)
+    {
+        TestEventsRaiser(msg.sender).raiseTokenTransfer(msg.sender, to, amount);
+        return true;
+    }
+
+    /// @dev Just emits a TokenApprove event on the caller
+    function approve(address spender, uint256 allowance)
+        external
+        returns (bool)
+    {
+        TestEventsRaiser(msg.sender).raiseTokenApprove(spender, allowance);
+        return true;
+    }
+
+    function allowance(address, address) external view returns (uint256) {
+        return 0;
+    }
+
+    /// @dev Retrieve the balance for `owner`.
+    function balanceOf(address owner)
+        external
+        view
+        returns (uint256)
+    {
+        return balances[owner];
+    }
+}
+
+
+/// @dev Mock the UniswapV2Router01 contract
+contract TestRouter is
+    IUniswapV2Router01
+{
+    string private _nextRevertReason;
+
+    /// @dev Set the revert reason for `swapExactTokensForTokens`.
+    function setRevertReason(string calldata reason)
+        external
+    {
+        _nextRevertReason = reason;
+    }
+
+    function swapExactTokensForTokens(
+        uint amountIn,
+        uint amountOutMin,
+        address[] calldata path,
+        address to,
+        uint deadline
+    ) external returns (uint[] memory amounts)
+    {
+        _revertIfReasonExists();
+
+        amounts = new uint[](path.length);
+        amounts[0] = amountIn;
+        amounts[amounts.length - 1] = amountOutMin;
+
+        TestEventsRaiser(msg.sender).raiseSwapExactTokensForTokensInput(
+            // tokens sold
+            amountIn,
+            // tokens bought
+            amountOutMin,
+            // output token (toTokenAddress)
+            path[path.length - 1],
+            // recipient
+            to,
+            // deadline
+            deadline
+        );
+    }
+
+    function _revertIfReasonExists()
+        private
+        view
+    {
+        if (bytes(_nextRevertReason).length != 0) {
+            revert(_nextRevertReason);
+        }
+    }
+
+}
+
+
+/// @dev UniswapV2Bridge overridden to mock tokens and Uniswap router
+contract TestUniswapV2Bridge is
+    UniswapV2Bridge,
+    TestEventsRaiser
+{
+
+    // Token address to TestToken instance.
+    mapping (address => TestToken) private _testTokens;
+    // TestRouter instance.
+    TestRouter private _testRouter;
+
+    constructor() public {
+        _testRouter = new TestRouter();
+    }
+
+    function setRouterRevertReason(string calldata revertReason)
+        external
+    {
+        _testRouter.setRevertReason(revertReason);
+    }
+
+    /// @dev Sets the balance of this contract for an existing token.
+    ///      The wei attached will be the balance.
+    function setTokenBalance(address tokenAddress, uint256 balance)
+        external
+    {
+        TestToken token = _testTokens[tokenAddress];
+        token.setBalance(address(this), balance);
+    }
+
+    /// @dev Create a new token
+    /// @param tokenAddress The token address. If zero, one will be created.
+    function createToken(
+        address tokenAddress
+    )
+        external
+        returns (TestToken token)
+    {
+        token = TestToken(tokenAddress);
+        if (tokenAddress == address(0)) {
+            token = new TestToken();
+        }
+        _testTokens[address(token)] = token;
+
+        return token;
+    }
+
+    function getRouterAddress()
+        external
+        view
+        returns (address)
+    {
+        return address(_testRouter);
+    }
+
+    function _getUniswapV2Router01Address()
+        internal
+        view
+        returns (address)
+    {
+        return address(_testRouter);
+    }
+}

contracts/asset-proxy/package.json

@@ -1,6 +1,6 @@
 {
     "name": "@0x/contracts-asset-proxy",
-    "version": "3.2.0",
+    "version": "3.3.0",
     "engines": {
         "node": ">=6.12"
     },
@@ -38,7 +38,7 @@
         "docs:json": "typedoc --excludePrivate --excludeExternals --excludeProtected --ignoreCompilerErrors --target ES5 --tsconfig typedoc-tsconfig.json --json $JSON_FILE_PATH $PROJECT_FILES"
     },
     "config": {
-        "abis": "./test/generated-artifacts/@(ChaiBridge|DydxBridge|ERC1155Proxy|ERC20BridgeProxy|ERC20Proxy|ERC721Proxy|Eth2DaiBridge|IAssetData|IAssetProxy|IAssetProxyDispatcher|IAuthorizable|IChai|IDydx|IDydxBridge|IERC20Bridge|IEth2Dai|IKyberNetworkProxy|IUniswapExchange|IUniswapExchangeFactory|KyberBridge|MixinAssetProxyDispatcher|MixinAuthorizable|MultiAssetProxy|Ownable|StaticCallProxy|TestChaiBridge|TestDydxBridge|TestERC20Bridge|TestEth2DaiBridge|TestKyberBridge|TestStaticCallTarget|TestUniswapBridge|UniswapBridge).json",
+        "abis": "./test/generated-artifacts/@(ChaiBridge|CurveBridge|DexForwarderBridge|DydxBridge|ERC1155Proxy|ERC20BridgeProxy|ERC20Proxy|ERC721Proxy|Eth2DaiBridge|IAssetData|IAssetProxy|IAssetProxyDispatcher|IAuthorizable|IChai|ICurve|IDydx|IDydxBridge|IERC20Bridge|IEth2Dai|IGasToken|IKyberNetworkProxy|IUniswapExchange|IUniswapExchangeFactory|IUniswapV2Router01|KyberBridge|MixinAssetProxyDispatcher|MixinAuthorizable|MixinGasToken|MultiAssetProxy|Ownable|StaticCallProxy|TestChaiBridge|TestDexForwarderBridge|TestDydxBridge|TestERC20Bridge|TestEth2DaiBridge|TestKyberBridge|TestStaticCallTarget|TestUniswapBridge|TestUniswapV2Bridge|UniswapBridge|UniswapV2Bridge).json",
         "abis:comment": "This list is auto-generated by contracts-gen. Don't edit manually."
     },
     "repository": {
@@ -51,12 +51,13 @@
     },
     "homepage": "https://github.com/0xProject/0x-monorepo/contracts/protocol/README.md",
     "devDependencies": {
-        "@0x/abi-gen": "^5.2.0",
-        "@0x/contracts-gen": "^2.0.7",
-        "@0x/contracts-test-utils": "^5.1.4",
-        "@0x/contracts-utils": "^4.3.0",
-        "@0x/dev-utils": "^3.2.0",
-        "@0x/sol-compiler": "^4.0.7",
+        "@0x/abi-gen": "^5.3.0",
+        "@0x/contract-wrappers": "^13.7.0",
+        "@0x/contracts-gen": "^2.0.9",
+        "@0x/contracts-test-utils": "^5.3.3",
+        "@0x/contracts-utils": "^4.5.0",
+        "@0x/dev-utils": "^3.2.2",
+        "@0x/sol-compiler": "^4.1.0",
         "@0x/ts-doc-gen": "^0.0.22",
         "@0x/tslint-config": "^4.0.0",
         "@types/lodash": "4.14.104",
@@ -78,17 +79,17 @@
         "typescript": "3.0.1"
     },
     "dependencies": {
-        "@0x/base-contract": "^6.2.0",
-        "@0x/contracts-erc1155": "^2.1.0",
-        "@0x/contracts-erc20": "^3.1.0",
-        "@0x/contracts-erc721": "^3.1.0",
-        "@0x/contracts-exchange-libs": "^4.3.0",
-        "@0x/order-utils": "^10.2.0",
-        "@0x/types": "^3.1.2",
-        "@0x/typescript-typings": "^5.0.2",
-        "@0x/utils": "^5.4.0",
-        "@0x/web3-wrapper": "^7.0.6",
-        "ethereum-types": "^3.1.0",
+        "@0x/base-contract": "^6.2.2",
+        "@0x/contracts-erc1155": "^2.1.6",
+        "@0x/contracts-erc20": "^3.2.0",
+        "@0x/contracts-erc721": "^3.1.6",
+        "@0x/contracts-exchange-libs": "^4.3.6",
+        "@0x/order-utils": "^10.2.5",
+        "@0x/types": "^3.1.3",
+        "@0x/typescript-typings": "^5.1.0",
+        "@0x/utils": "^5.5.0",
+        "@0x/web3-wrapper": "^7.1.0",
+        "ethereum-types": "^3.1.1",
         "lodash": "^4.17.11"
     },
     "publishConfig": {

contracts/asset-proxy/src/artifacts.ts

@@ -6,6 +6,8 @@
 import { ContractArtifact } from 'ethereum-types';
 
 import * as ChaiBridge from '../generated-artifacts/ChaiBridge.json';
+import * as CurveBridge from '../generated-artifacts/CurveBridge.json';
+import * as DexForwarderBridge from '../generated-artifacts/DexForwarderBridge.json';
 import * as DydxBridge from '../generated-artifacts/DydxBridge.json';
 import * as ERC1155Proxy from '../generated-artifacts/ERC1155Proxy.json';
 import * as ERC20BridgeProxy from '../generated-artifacts/ERC20BridgeProxy.json';
@@ -17,27 +19,34 @@ import * as IAssetProxy from '../generated-artifacts/IAssetProxy.json';
 import * as IAssetProxyDispatcher from '../generated-artifacts/IAssetProxyDispatcher.json';
 import * as IAuthorizable from '../generated-artifacts/IAuthorizable.json';
 import * as IChai from '../generated-artifacts/IChai.json';
+import * as ICurve from '../generated-artifacts/ICurve.json';
 import * as IDydx from '../generated-artifacts/IDydx.json';
 import * as IDydxBridge from '../generated-artifacts/IDydxBridge.json';
 import * as IERC20Bridge from '../generated-artifacts/IERC20Bridge.json';
 import * as IEth2Dai from '../generated-artifacts/IEth2Dai.json';
+import * as IGasToken from '../generated-artifacts/IGasToken.json';
 import * as IKyberNetworkProxy from '../generated-artifacts/IKyberNetworkProxy.json';
 import * as IUniswapExchange from '../generated-artifacts/IUniswapExchange.json';
 import * as IUniswapExchangeFactory from '../generated-artifacts/IUniswapExchangeFactory.json';
+import * as IUniswapV2Router01 from '../generated-artifacts/IUniswapV2Router01.json';
 import * as KyberBridge from '../generated-artifacts/KyberBridge.json';
 import * as MixinAssetProxyDispatcher from '../generated-artifacts/MixinAssetProxyDispatcher.json';
 import * as MixinAuthorizable from '../generated-artifacts/MixinAuthorizable.json';
+import * as MixinGasToken from '../generated-artifacts/MixinGasToken.json';
 import * as MultiAssetProxy from '../generated-artifacts/MultiAssetProxy.json';
 import * as Ownable from '../generated-artifacts/Ownable.json';
 import * as StaticCallProxy from '../generated-artifacts/StaticCallProxy.json';
 import * as TestChaiBridge from '../generated-artifacts/TestChaiBridge.json';
+import * as TestDexForwarderBridge from '../generated-artifacts/TestDexForwarderBridge.json';
 import * as TestDydxBridge from '../generated-artifacts/TestDydxBridge.json';
 import * as TestERC20Bridge from '../generated-artifacts/TestERC20Bridge.json';
 import * as TestEth2DaiBridge from '../generated-artifacts/TestEth2DaiBridge.json';
 import * as TestKyberBridge from '../generated-artifacts/TestKyberBridge.json';
 import * as TestStaticCallTarget from '../generated-artifacts/TestStaticCallTarget.json';
 import * as TestUniswapBridge from '../generated-artifacts/TestUniswapBridge.json';
+import * as TestUniswapV2Bridge from '../generated-artifacts/TestUniswapV2Bridge.json';
 import * as UniswapBridge from '../generated-artifacts/UniswapBridge.json';
+import * as UniswapV2Bridge from '../generated-artifacts/UniswapV2Bridge.json';
 export const artifacts = {
     MixinAssetProxyDispatcher: MixinAssetProxyDispatcher as ContractArtifact,
     MixinAuthorizable: MixinAuthorizable as ContractArtifact,
@@ -49,27 +58,36 @@ export const artifacts = {
     MultiAssetProxy: MultiAssetProxy as ContractArtifact,
     StaticCallProxy: StaticCallProxy as ContractArtifact,
     ChaiBridge: ChaiBridge as ContractArtifact,
+    CurveBridge: CurveBridge as ContractArtifact,
+    DexForwarderBridge: DexForwarderBridge as ContractArtifact,
     DydxBridge: DydxBridge as ContractArtifact,
     Eth2DaiBridge: Eth2DaiBridge as ContractArtifact,
     KyberBridge: KyberBridge as ContractArtifact,
+    MixinGasToken: MixinGasToken as ContractArtifact,
     UniswapBridge: UniswapBridge as ContractArtifact,
+    UniswapV2Bridge: UniswapV2Bridge as ContractArtifact,
     IAssetData: IAssetData as ContractArtifact,
     IAssetProxy: IAssetProxy as ContractArtifact,
     IAssetProxyDispatcher: IAssetProxyDispatcher as ContractArtifact,
     IAuthorizable: IAuthorizable as ContractArtifact,
     IChai: IChai as ContractArtifact,
+    ICurve: ICurve as ContractArtifact,
     IDydx: IDydx as ContractArtifact,
     IDydxBridge: IDydxBridge as ContractArtifact,
     IERC20Bridge: IERC20Bridge as ContractArtifact,
     IEth2Dai: IEth2Dai as ContractArtifact,
+    IGasToken: IGasToken as ContractArtifact,
     IKyberNetworkProxy: IKyberNetworkProxy as ContractArtifact,
     IUniswapExchange: IUniswapExchange as ContractArtifact,
     IUniswapExchangeFactory: IUniswapExchangeFactory as ContractArtifact,
+    IUniswapV2Router01: IUniswapV2Router01 as ContractArtifact,
     TestChaiBridge: TestChaiBridge as ContractArtifact,
+    TestDexForwarderBridge: TestDexForwarderBridge as ContractArtifact,
     TestDydxBridge: TestDydxBridge as ContractArtifact,
     TestERC20Bridge: TestERC20Bridge as ContractArtifact,
     TestEth2DaiBridge: TestEth2DaiBridge as ContractArtifact,
     TestKyberBridge: TestKyberBridge as ContractArtifact,
     TestStaticCallTarget: TestStaticCallTarget as ContractArtifact,
     TestUniswapBridge: TestUniswapBridge as ContractArtifact,
+    TestUniswapV2Bridge: TestUniswapV2Bridge as ContractArtifact,
 };

contracts/asset-proxy/src/dex_forwarder_bridge.ts

@@ -0,0 +1,27 @@
+import { AbiEncoder, BigNumber } from '@0x/utils';
+
+export interface DexForwarderBridgeCall {
+    target: string;
+    inputTokenAmount: BigNumber;
+    outputTokenAmount: BigNumber;
+    bridgeData: string;
+}
+
+export interface DexForwaderBridgeData {
+    inputToken: string;
+    calls: DexForwarderBridgeCall[];
+}
+
+export const dexForwarderBridgeDataEncoder = AbiEncoder.create([
+    { name: 'inputToken', type: 'address' },
+    {
+        name: 'calls',
+        type: 'tuple[]',
+        components: [
+            { name: 'target', type: 'address' },
+            { name: 'inputTokenAmount', type: 'uint256' },
+            { name: 'outputTokenAmount', type: 'uint256' },
+            { name: 'bridgeData', type: 'bytes' },
+        ],
+    },
+]);

contracts/asset-proxy/src/dydx_bridge_encoder.ts

@@ -7,7 +7,7 @@ export enum DydxBridgeActionType {
 
 export interface DydxBridgeAction {
     actionType: DydxBridgeActionType;
-    accountId: BigNumber;
+    accountIdx: BigNumber;
     marketId: BigNumber;
     conversionRateNumerator: BigNumber;
     conversionRateDenominator: BigNumber;
@@ -29,7 +29,7 @@ export const dydxBridgeDataEncoder = AbiEncoder.create([
                 type: 'tuple[]',
                 components: [
                     { name: 'actionType', type: 'uint8' },
-                    { name: 'accountId', type: 'uint256' },
+                    { name: 'accountIdx', type: 'uint256' },
                     { name: 'marketId', type: 'uint256' },
                     { name: 'conversionRateNumerator', type: 'uint256' },
                     { name: 'conversionRateDenominator', type: 'uint256' },

contracts/asset-proxy/src/index.ts

@@ -1,21 +1,22 @@
 export { artifacts } from './artifacts';
 export {
+    ChaiBridgeContract,
     ERC1155ProxyContract,
     ERC20BridgeProxyContract,
     ERC20ProxyContract,
     ERC721ProxyContract,
     Eth2DaiBridgeContract,
     DydxBridgeContract,
-    TestDydxBridgeContract,
     IAssetDataContract,
     IAssetProxyContract,
+    IChaiContract,
+    IDydxContract,
+    KyberBridgeContract,
     MultiAssetProxyContract,
     StaticCallProxyContract,
+    TestDydxBridgeContract,
     TestStaticCallTargetContract,
     UniswapBridgeContract,
-    KyberBridgeContract,
-    ChaiBridgeContract,
-    IChaiContract,
 } from './wrappers';
 
 export { ERC20Wrapper } from './erc20_wrapper';
@@ -87,3 +88,4 @@ export {
 } from './asset_data';
 
 export * from './dydx_bridge_encoder';
+export * from './dex_forwarder_bridge';

contracts/asset-proxy/src/wrappers.ts

@@ -4,6 +4,8 @@
  * -----------------------------------------------------------------------------
  */
 export * from '../generated-wrappers/chai_bridge';
+export * from '../generated-wrappers/curve_bridge';
+export * from '../generated-wrappers/dex_forwarder_bridge';
 export * from '../generated-wrappers/dydx_bridge';
 export * from '../generated-wrappers/erc1155_proxy';
 export * from '../generated-wrappers/erc20_bridge_proxy';
@@ -15,24 +17,31 @@ export * from '../generated-wrappers/i_asset_proxy';
 export * from '../generated-wrappers/i_asset_proxy_dispatcher';
 export * from '../generated-wrappers/i_authorizable';
 export * from '../generated-wrappers/i_chai';
+export * from '../generated-wrappers/i_curve';
 export * from '../generated-wrappers/i_dydx';
 export * from '../generated-wrappers/i_dydx_bridge';
 export * from '../generated-wrappers/i_erc20_bridge';
 export * from '../generated-wrappers/i_eth2_dai';
+export * from '../generated-wrappers/i_gas_token';
 export * from '../generated-wrappers/i_kyber_network_proxy';
 export * from '../generated-wrappers/i_uniswap_exchange';
 export * from '../generated-wrappers/i_uniswap_exchange_factory';
+export * from '../generated-wrappers/i_uniswap_v2_router01';
 export * from '../generated-wrappers/kyber_bridge';
 export * from '../generated-wrappers/mixin_asset_proxy_dispatcher';
 export * from '../generated-wrappers/mixin_authorizable';
+export * from '../generated-wrappers/mixin_gas_token';
 export * from '../generated-wrappers/multi_asset_proxy';
 export * from '../generated-wrappers/ownable';
 export * from '../generated-wrappers/static_call_proxy';
 export * from '../generated-wrappers/test_chai_bridge';
+export * from '../generated-wrappers/test_dex_forwarder_bridge';
 export * from '../generated-wrappers/test_dydx_bridge';
 export * from '../generated-wrappers/test_erc20_bridge';
 export * from '../generated-wrappers/test_eth2_dai_bridge';
 export * from '../generated-wrappers/test_kyber_bridge';
 export * from '../generated-wrappers/test_static_call_target';
 export * from '../generated-wrappers/test_uniswap_bridge';
+export * from '../generated-wrappers/test_uniswap_v2_bridge';
 export * from '../generated-wrappers/uniswap_bridge';
+export * from '../generated-wrappers/uniswap_v2_bridge';

contracts/asset-proxy/test/artifacts.ts

@@ -6,6 +6,8 @@
 import { ContractArtifact } from 'ethereum-types';
 
 import * as ChaiBridge from '../test/generated-artifacts/ChaiBridge.json';
+import * as CurveBridge from '../test/generated-artifacts/CurveBridge.json';
+import * as DexForwarderBridge from '../test/generated-artifacts/DexForwarderBridge.json';
 import * as DydxBridge from '../test/generated-artifacts/DydxBridge.json';
 import * as ERC1155Proxy from '../test/generated-artifacts/ERC1155Proxy.json';
 import * as ERC20BridgeProxy from '../test/generated-artifacts/ERC20BridgeProxy.json';
@@ -17,27 +19,34 @@ import * as IAssetProxy from '../test/generated-artifacts/IAssetProxy.json';
 import * as IAssetProxyDispatcher from '../test/generated-artifacts/IAssetProxyDispatcher.json';
 import * as IAuthorizable from '../test/generated-artifacts/IAuthorizable.json';
 import * as IChai from '../test/generated-artifacts/IChai.json';
+import * as ICurve from '../test/generated-artifacts/ICurve.json';
 import * as IDydx from '../test/generated-artifacts/IDydx.json';
 import * as IDydxBridge from '../test/generated-artifacts/IDydxBridge.json';
 import * as IERC20Bridge from '../test/generated-artifacts/IERC20Bridge.json';
 import * as IEth2Dai from '../test/generated-artifacts/IEth2Dai.json';
+import * as IGasToken from '../test/generated-artifacts/IGasToken.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 IUniswapV2Router01 from '../test/generated-artifacts/IUniswapV2Router01.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 MixinGasToken from '../test/generated-artifacts/MixinGasToken.json';
 import * as MultiAssetProxy from '../test/generated-artifacts/MultiAssetProxy.json';
 import * as Ownable from '../test/generated-artifacts/Ownable.json';
 import * as StaticCallProxy from '../test/generated-artifacts/StaticCallProxy.json';
 import * as TestChaiBridge from '../test/generated-artifacts/TestChaiBridge.json';
+import * as TestDexForwarderBridge from '../test/generated-artifacts/TestDexForwarderBridge.json';
 import * as TestDydxBridge from '../test/generated-artifacts/TestDydxBridge.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 TestUniswapV2Bridge from '../test/generated-artifacts/TestUniswapV2Bridge.json';
 import * as UniswapBridge from '../test/generated-artifacts/UniswapBridge.json';
+import * as UniswapV2Bridge from '../test/generated-artifacts/UniswapV2Bridge.json';
 export const artifacts = {
     MixinAssetProxyDispatcher: MixinAssetProxyDispatcher as ContractArtifact,
     MixinAuthorizable: MixinAuthorizable as ContractArtifact,
@@ -49,27 +58,36 @@ export const artifacts = {
     MultiAssetProxy: MultiAssetProxy as ContractArtifact,
     StaticCallProxy: StaticCallProxy as ContractArtifact,
     ChaiBridge: ChaiBridge as ContractArtifact,
+    CurveBridge: CurveBridge as ContractArtifact,
+    DexForwarderBridge: DexForwarderBridge as ContractArtifact,
     DydxBridge: DydxBridge as ContractArtifact,
     Eth2DaiBridge: Eth2DaiBridge as ContractArtifact,
     KyberBridge: KyberBridge as ContractArtifact,
+    MixinGasToken: MixinGasToken as ContractArtifact,
     UniswapBridge: UniswapBridge as ContractArtifact,
+    UniswapV2Bridge: UniswapV2Bridge as ContractArtifact,
     IAssetData: IAssetData as ContractArtifact,
     IAssetProxy: IAssetProxy as ContractArtifact,
     IAssetProxyDispatcher: IAssetProxyDispatcher as ContractArtifact,
     IAuthorizable: IAuthorizable as ContractArtifact,
     IChai: IChai as ContractArtifact,
+    ICurve: ICurve as ContractArtifact,
     IDydx: IDydx as ContractArtifact,
     IDydxBridge: IDydxBridge as ContractArtifact,
     IERC20Bridge: IERC20Bridge as ContractArtifact,
     IEth2Dai: IEth2Dai as ContractArtifact,
+    IGasToken: IGasToken as ContractArtifact,
     IKyberNetworkProxy: IKyberNetworkProxy as ContractArtifact,
     IUniswapExchange: IUniswapExchange as ContractArtifact,
     IUniswapExchangeFactory: IUniswapExchangeFactory as ContractArtifact,
+    IUniswapV2Router01: IUniswapV2Router01 as ContractArtifact,
     TestChaiBridge: TestChaiBridge as ContractArtifact,
+    TestDexForwarderBridge: TestDexForwarderBridge as ContractArtifact,
     TestDydxBridge: TestDydxBridge as ContractArtifact,
     TestERC20Bridge: TestERC20Bridge as ContractArtifact,
     TestEth2DaiBridge: TestEth2DaiBridge as ContractArtifact,
     TestKyberBridge: TestKyberBridge as ContractArtifact,
     TestStaticCallTarget: TestStaticCallTarget as ContractArtifact,
     TestUniswapBridge: TestUniswapBridge as ContractArtifact,
+    TestUniswapV2Bridge: TestUniswapV2Bridge as ContractArtifact,
 };

contracts/asset-proxy/test/dex_forwarder_bridge.ts

@@ -0,0 +1,356 @@
+import { ContractTxFunctionObj } from '@0x/contract-wrappers';
+import {
+    blockchainTests,
+    constants,
+    expect,
+    filterLogsToArguments,
+    getRandomInteger,
+    randomAddress,
+    shortZip,
+} from '@0x/contracts-test-utils';
+import { BigNumber, hexUtils, NULL_ADDRESS } from '@0x/utils';
+import { DecodedLogs } from 'ethereum-types';
+import * as _ from 'lodash';
+
+import { DexForwarderBridgeCall, dexForwarderBridgeDataEncoder } from '../src/dex_forwarder_bridge';
+
+import { artifacts } from './artifacts';
+import {
+    TestDexForwarderBridgeBridgeTransferFromCalledEventArgs as BtfCalledEventArgs,
+    TestDexForwarderBridgeContract,
+    TestDexForwarderBridgeEvents as TestEvents,
+} from './wrappers';
+
+const { ZERO_AMOUNT } = constants;
+
+blockchainTests.resets('DexForwarderBridge unit tests', env => {
+    let testContract: TestDexForwarderBridgeContract;
+    let inputToken: string;
+    let outputToken: string;
+    const BRIDGE_SUCCESS = '0xdc1600f3';
+    const BRIDGE_FAILURE = '0xffffffff';
+    const BRIDGE_REVERT_ERROR = 'oopsie';
+    const INCOMPLETE_FILL_REVERT = 'DexForwarderBridge/INCOMPLETE_FILL';
+    const NOT_AUTHORIZED_REVERT = 'DexForwarderBridge/SENDER_NOT_AUTHORIZED';
+    const DEFAULTS = {
+        toAddress: randomAddress(),
+    };
+
+    before(async () => {
+        testContract = await TestDexForwarderBridgeContract.deployFrom0xArtifactAsync(
+            artifacts.TestDexForwarderBridge,
+            env.provider,
+            env.txDefaults,
+            artifacts,
+        );
+        // Create test tokens.
+        [inputToken, outputToken] = [
+            await callAndTransactAsync(testContract.createToken()),
+            await callAndTransactAsync(testContract.createToken()),
+        ];
+        await callAndTransactAsync(testContract.setAuthorized(env.txDefaults.from as string));
+    });
+
+    async function callAndTransactAsync<TResult>(fnCall: ContractTxFunctionObj<TResult>): Promise<TResult> {
+        const result = await fnCall.callAsync();
+        await fnCall.awaitTransactionSuccessAsync({}, { shouldValidate: false });
+        return result;
+    }
+
+    function getRandomBridgeCall(
+        bridgeAddress: string,
+        fields: Partial<DexForwarderBridgeCall> = {},
+    ): DexForwarderBridgeCall {
+        return {
+            target: bridgeAddress,
+            inputTokenAmount: getRandomInteger(1, '100e18'),
+            outputTokenAmount: getRandomInteger(1, '100e18'),
+            bridgeData: hexUtils.leftPad(inputToken),
+            ...fields,
+        };
+    }
+
+    describe('bridgeTransferFrom()', () => {
+        let goodBridgeCalls: DexForwarderBridgeCall[];
+        let revertingBridgeCall: DexForwarderBridgeCall;
+        let failingBridgeCall: DexForwarderBridgeCall;
+        let allBridgeCalls: DexForwarderBridgeCall[];
+        let totalFillableOutputAmount: BigNumber;
+        let totalFillableInputAmount: BigNumber;
+        let recipientOutputBalance: BigNumber;
+
+        beforeEach(async () => {
+            goodBridgeCalls = [];
+            for (let i = 0; i < 4; ++i) {
+                goodBridgeCalls.push(await createBridgeCallAsync({ returnCode: BRIDGE_SUCCESS }));
+            }
+            revertingBridgeCall = await createBridgeCallAsync({ revertError: BRIDGE_REVERT_ERROR });
+            failingBridgeCall = await createBridgeCallAsync({ returnCode: BRIDGE_FAILURE });
+            allBridgeCalls = _.shuffle([failingBridgeCall, revertingBridgeCall, ...goodBridgeCalls]);
+
+            totalFillableInputAmount = BigNumber.sum(...goodBridgeCalls.map(c => c.inputTokenAmount));
+            totalFillableOutputAmount = BigNumber.sum(...goodBridgeCalls.map(c => c.outputTokenAmount));
+
+            // Grant the taker some output tokens.
+            await testContract.setTokenBalance(
+                outputToken,
+                DEFAULTS.toAddress,
+                (recipientOutputBalance = getRandomInteger(1, '100e18')),
+            );
+        });
+
+        async function setForwarderInputBalanceAsync(amount: BigNumber): Promise<void> {
+            await testContract
+                .setTokenBalance(inputToken, testContract.address, amount)
+                .awaitTransactionSuccessAsync({}, { shouldValidate: false });
+        }
+
+        async function createBridgeCallAsync(
+            opts: Partial<{
+                returnCode: string;
+                revertError: string;
+                callFields: Partial<DexForwarderBridgeCall>;
+                outputFillAmount: BigNumber;
+            }>,
+        ): Promise<DexForwarderBridgeCall> {
+            const { returnCode, revertError, callFields, outputFillAmount } = {
+                returnCode: BRIDGE_SUCCESS,
+                revertError: '',
+                ...opts,
+            };
+            const bridge = await callAndTransactAsync(testContract.createBridge(returnCode, revertError));
+            const call = getRandomBridgeCall(bridge, callFields);
+            await testContract
+                .setBridgeTransferAmount(call.target, outputFillAmount || call.outputTokenAmount)
+                .awaitTransactionSuccessAsync({}, { shouldValidate: false });
+            return call;
+        }
+
+        async function callBridgeTransferFromAsync(opts: {
+            bridgeData: string;
+            sellAmount?: BigNumber;
+            buyAmount?: BigNumber;
+        }): Promise<DecodedLogs> {
+            // Fund the forwarder with input tokens to sell.
+            await setForwarderInputBalanceAsync(opts.sellAmount || totalFillableInputAmount);
+            const call = testContract.bridgeTransferFrom(
+                outputToken,
+                testContract.address,
+                DEFAULTS.toAddress,
+                opts.buyAmount || totalFillableOutputAmount,
+                opts.bridgeData,
+            );
+            const returnCode = await call.callAsync();
+            if (returnCode !== BRIDGE_SUCCESS) {
+                throw new Error('Expected BRIDGE_SUCCESS');
+            }
+            const receipt = await call.awaitTransactionSuccessAsync({}, { shouldValidate: false });
+            // tslint:disable-next-line: no-unnecessary-type-assertion
+            return receipt.logs as DecodedLogs;
+        }
+
+        it('succeeds with no bridge calls and no input balance', async () => {
+            const bridgeData = dexForwarderBridgeDataEncoder.encode({
+                inputToken,
+                calls: [],
+            });
+            await callBridgeTransferFromAsync({ bridgeData, sellAmount: ZERO_AMOUNT });
+        });
+
+        it('succeeds with bridge calls and no input balance', async () => {
+            const bridgeData = dexForwarderBridgeDataEncoder.encode({
+                inputToken,
+                calls: allBridgeCalls,
+            });
+            await callBridgeTransferFromAsync({ bridgeData, sellAmount: ZERO_AMOUNT });
+        });
+
+        it('fails with no bridge calls and an input balance', async () => {
+            const bridgeData = dexForwarderBridgeDataEncoder.encode({
+                inputToken,
+                calls: [],
+            });
+            return expect(callBridgeTransferFromAsync({ bridgeData, sellAmount: new BigNumber(1) })).to.revertWith(
+                INCOMPLETE_FILL_REVERT,
+            );
+        });
+
+        it('fails if entire input token balance is not consumed', async () => {
+            const bridgeData = dexForwarderBridgeDataEncoder.encode({
+                inputToken,
+                calls: allBridgeCalls,
+            });
+            return expect(
+                callBridgeTransferFromAsync({
+                    bridgeData,
+                    sellAmount: totalFillableInputAmount.plus(1),
+                }),
+            ).to.revertWith(INCOMPLETE_FILL_REVERT);
+        });
+
+        it('fails if not authorized', async () => {
+            const calls = goodBridgeCalls.slice(0, 1);
+            const bridgeData = dexForwarderBridgeDataEncoder.encode({
+                inputToken,
+                calls,
+            });
+            await callAndTransactAsync(testContract.setAuthorized(NULL_ADDRESS));
+            return expect(callBridgeTransferFromAsync({ bridgeData, sellAmount: new BigNumber(1) })).to.revertWith(
+                NOT_AUTHORIZED_REVERT,
+            );
+        });
+
+        it('succeeds with one bridge call', async () => {
+            const calls = goodBridgeCalls.slice(0, 1);
+            const bridgeData = dexForwarderBridgeDataEncoder.encode({
+                inputToken,
+                calls,
+            });
+            await callBridgeTransferFromAsync({ bridgeData, sellAmount: calls[0].inputTokenAmount });
+        });
+
+        it('succeeds with many bridge calls', async () => {
+            const calls = goodBridgeCalls;
+            const bridgeData = dexForwarderBridgeDataEncoder.encode({
+                inputToken,
+                calls,
+            });
+            await callBridgeTransferFromAsync({ bridgeData });
+        });
+
+        it('swallows a failing bridge call', async () => {
+            const calls = _.shuffle([...goodBridgeCalls, failingBridgeCall]);
+            const bridgeData = dexForwarderBridgeDataEncoder.encode({
+                inputToken,
+                calls,
+            });
+            await callBridgeTransferFromAsync({ bridgeData });
+        });
+
+        it('consumes input tokens for output tokens', async () => {
+            const calls = allBridgeCalls;
+            const bridgeData = dexForwarderBridgeDataEncoder.encode({
+                inputToken,
+                calls,
+            });
+            await callBridgeTransferFromAsync({ bridgeData });
+            const currentBridgeInputBalance = await testContract
+                .balanceOf(inputToken, testContract.address)
+                .callAsync();
+            expect(currentBridgeInputBalance).to.bignumber.eq(0);
+            const currentRecipientOutputBalance = await testContract
+                .balanceOf(outputToken, DEFAULTS.toAddress)
+                .callAsync();
+            expect(currentRecipientOutputBalance).to.bignumber.eq(totalFillableOutputAmount);
+        });
+
+        it("transfers only up to each call's input amount to each bridge", async () => {
+            const calls = goodBridgeCalls;
+            const bridgeData = dexForwarderBridgeDataEncoder.encode({
+                inputToken,
+                calls,
+            });
+            const logs = await callBridgeTransferFromAsync({ bridgeData });
+            const btfs = filterLogsToArguments<BtfCalledEventArgs>(logs, TestEvents.BridgeTransferFromCalled);
+            for (const [call, btf] of shortZip(goodBridgeCalls, btfs)) {
+                expect(btf.inputTokenBalance).to.bignumber.eq(call.inputTokenAmount);
+            }
+        });
+
+        it('transfers only up to outstanding sell amount to each bridge', async () => {
+            // Prepend an extra bridge call.
+            const calls = [
+                await createBridgeCallAsync({
+                    callFields: {
+                        inputTokenAmount: new BigNumber(1),
+                        outputTokenAmount: new BigNumber(1),
+                    },
+                }),
+                ...goodBridgeCalls,
+            ];
+            const bridgeData = dexForwarderBridgeDataEncoder.encode({
+                inputToken,
+                calls,
+            });
+            const logs = await callBridgeTransferFromAsync({ bridgeData });
+            const btfs = filterLogsToArguments<BtfCalledEventArgs>(logs, TestEvents.BridgeTransferFromCalled);
+            expect(btfs).to.be.length(goodBridgeCalls.length + 1);
+            // The last call will receive 1 less token.
+            const lastCall = calls.slice(-1)[0];
+            const lastBtf = btfs.slice(-1)[0];
+            expect(lastBtf.inputTokenBalance).to.bignumber.eq(lastCall.inputTokenAmount.minus(1));
+        });
+
+        it('recoups funds from a bridge that fails', async () => {
+            // Prepend a call that will take the whole input amount but will
+            // fail.
+            const badCall = await createBridgeCallAsync({
+                callFields: { inputTokenAmount: totalFillableInputAmount },
+                returnCode: BRIDGE_FAILURE,
+            });
+            const calls = [badCall, ...goodBridgeCalls];
+            const bridgeData = dexForwarderBridgeDataEncoder.encode({
+                inputToken,
+                calls,
+            });
+            const logs = await callBridgeTransferFromAsync({ bridgeData });
+            const btfs = filterLogsToArguments<BtfCalledEventArgs>(logs, TestEvents.BridgeTransferFromCalled);
+            expect(btfs).to.be.length(goodBridgeCalls.length);
+        });
+
+        it('recoups funds from a bridge that reverts', async () => {
+            // Prepend a call that will take the whole input amount but will
+            // revert.
+            const badCall = await createBridgeCallAsync({
+                callFields: { inputTokenAmount: totalFillableInputAmount },
+                revertError: BRIDGE_REVERT_ERROR,
+            });
+            const calls = [badCall, ...goodBridgeCalls];
+            const bridgeData = dexForwarderBridgeDataEncoder.encode({
+                inputToken,
+                calls,
+            });
+            const logs = await callBridgeTransferFromAsync({ bridgeData });
+            const btfs = filterLogsToArguments<BtfCalledEventArgs>(logs, TestEvents.BridgeTransferFromCalled);
+            expect(btfs).to.be.length(goodBridgeCalls.length);
+        });
+
+        it('recoups funds from a bridge that under-pays', async () => {
+            // Prepend a call that will take the whole input amount but will
+            // underpay the output amount..
+            const badCall = await createBridgeCallAsync({
+                callFields: {
+                    inputTokenAmount: totalFillableInputAmount,
+                    outputTokenAmount: new BigNumber(2),
+                },
+                outputFillAmount: new BigNumber(1),
+            });
+            const calls = [badCall, ...goodBridgeCalls];
+            const bridgeData = dexForwarderBridgeDataEncoder.encode({
+                inputToken,
+                calls,
+            });
+            const logs = await callBridgeTransferFromAsync({ bridgeData });
+            const btfs = filterLogsToArguments<BtfCalledEventArgs>(logs, TestEvents.BridgeTransferFromCalled);
+            expect(btfs).to.be.length(goodBridgeCalls.length);
+        });
+    });
+
+    describe('executeBridgeCall()', () => {
+        it('cannot be called externally', async () => {
+            return expect(
+                testContract
+                    .executeBridgeCall(
+                        randomAddress(),
+                        randomAddress(),
+                        randomAddress(),
+                        randomAddress(),
+                        new BigNumber(1),
+                        new BigNumber(1),
+                        constants.NULL_BYTES,
+                    )
+                    .callAsync(),
+            ).to.revertWith('DexForwarderBridge/ONLY_SELF');
+        });
+    });
+});

contracts/asset-proxy/test/dydx_bridge.ts

@@ -17,14 +17,14 @@ blockchainTests.resets('DydxBridge unit tests', env => {
     const notAuthorized = '0x0000000000000000000000000000000000000001';
     const defaultDepositAction = {
         actionType: DydxBridgeActionType.Deposit,
-        accountId: constants.ZERO_AMOUNT,
+        accountIdx: constants.ZERO_AMOUNT,
         marketId,
         conversionRateNumerator: constants.ZERO_AMOUNT,
         conversionRateDenominator: constants.ZERO_AMOUNT,
     };
     const defaultWithdrawAction = {
         actionType: DydxBridgeActionType.Withdraw,
-        accountId: constants.ZERO_AMOUNT,
+        accountIdx: constants.ZERO_AMOUNT,
         marketId,
         conversionRateNumerator: constants.ZERO_AMOUNT,
         conversionRateDenominator: constants.ZERO_AMOUNT,
@@ -118,7 +118,7 @@ blockchainTests.resets('DydxBridge unit tests', env => {
             for (const action of bridgeData.actions) {
                 expectedOperateActionEvents.push({
                     actionType: action.actionType as number,
-                    accountId: action.accountId,
+                    accountIdx: action.accountIdx,
                     amountSign: action.actionType === DydxBridgeActionType.Deposit ? true : false,
                     amountDenomination: weiDenomination,
                     amountRef: deltaAmountRef,

contracts/asset-proxy/test/uniswapv2_bridge.ts

@@ -0,0 +1,216 @@
+import {
+    blockchainTests,
+    constants,
+    expect,
+    filterLogsToArguments,
+    getRandomInteger,
+    randomAddress,
+} from '@0x/contracts-test-utils';
+import { AssetProxyId } from '@0x/types';
+import { AbiEncoder, BigNumber, hexUtils } from '@0x/utils';
+import { DecodedLogs } from 'ethereum-types';
+import * as _ from 'lodash';
+
+import { artifacts } from './artifacts';
+
+import {
+    TestUniswapV2BridgeContract,
+    TestUniswapV2BridgeEvents as ContractEvents,
+    TestUniswapV2BridgeSwapExactTokensForTokensInputEventArgs as SwapExactTokensForTokensArgs,
+    TestUniswapV2BridgeTokenApproveEventArgs as TokenApproveArgs,
+    TestUniswapV2BridgeTokenTransferEventArgs as TokenTransferArgs,
+} from './wrappers';
+
+blockchainTests.resets('UniswapV2 unit tests', env => {
+    const FROM_TOKEN_DECIMALS = 6;
+    const TO_TOKEN_DECIMALS = 18;
+    const FROM_TOKEN_BASE = new BigNumber(10).pow(FROM_TOKEN_DECIMALS);
+    const TO_TOKEN_BASE = new BigNumber(10).pow(TO_TOKEN_DECIMALS);
+    let testContract: TestUniswapV2BridgeContract;
+
+    before(async () => {
+        testContract = await TestUniswapV2BridgeContract.deployFrom0xArtifactAsync(
+            artifacts.TestUniswapV2Bridge,
+            env.provider,
+            env.txDefaults,
+            artifacts,
+        );
+    });
+
+    describe('isValidSignature()', () => {
+        it('returns success bytes', async () => {
+            const LEGACY_WALLET_MAGIC_VALUE = '0xb0671381';
+            const result = await testContract
+                .isValidSignature(hexUtils.random(), hexUtils.random(_.random(0, 32)))
+                .callAsync();
+            expect(result).to.eq(LEGACY_WALLET_MAGIC_VALUE);
+        });
+    });
+
+    describe('bridgeTransferFrom()', () => {
+        interface TransferFromOpts {
+            tokenAddressesPath: string[];
+            toAddress: string;
+            // Amount to pass into `bridgeTransferFrom()`
+            amount: BigNumber;
+            // Token balance of the bridge.
+            fromTokenBalance: BigNumber;
+            // Router reverts with this reason
+            routerRevertReason: string;
+        }
+
+        interface TransferFromResult {
+            opts: TransferFromOpts;
+            result: string;
+            logs: DecodedLogs;
+            blocktime: number;
+        }
+
+        function createTransferFromOpts(opts?: Partial<TransferFromOpts>): TransferFromOpts {
+            const amount = getRandomInteger(1, TO_TOKEN_BASE.times(100));
+            return {
+                tokenAddressesPath: Array(2).fill(constants.NULL_ADDRESS),
+                amount,
+                toAddress: randomAddress(),
+                fromTokenBalance: getRandomInteger(1, FROM_TOKEN_BASE.times(100)),
+                routerRevertReason: '',
+                ...opts,
+            };
+        }
+
+        const bridgeDataEncoder = AbiEncoder.create('(address[])');
+
+        async function transferFromAsync(opts?: Partial<TransferFromOpts>): Promise<TransferFromResult> {
+            const _opts = createTransferFromOpts(opts);
+
+            for (let i = 0; i < _opts.tokenAddressesPath.length; i++) {
+                const createFromTokenFn = testContract.createToken(_opts.tokenAddressesPath[i]);
+                _opts.tokenAddressesPath[i] = await createFromTokenFn.callAsync();
+                await createFromTokenFn.awaitTransactionSuccessAsync();
+            }
+
+            // Set the token balance for the token we're converting from.
+            await testContract
+                .setTokenBalance(_opts.tokenAddressesPath[0], _opts.fromTokenBalance)
+                .awaitTransactionSuccessAsync();
+
+            // Set revert reason for the router.
+            await testContract.setRouterRevertReason(_opts.routerRevertReason).awaitTransactionSuccessAsync();
+
+            // Call bridgeTransferFrom().
+            const bridgeTransferFromFn = testContract.bridgeTransferFrom(
+                // Output token
+                _opts.tokenAddressesPath[_opts.tokenAddressesPath.length - 1],
+                // Random maker address.
+                randomAddress(),
+                // Recipient address.
+                _opts.toAddress,
+                // Transfer amount.
+                _opts.amount,
+                // ABI-encode the input token address as the bridge data. // FIXME
+                bridgeDataEncoder.encode([_opts.tokenAddressesPath]),
+            );
+            const result = await bridgeTransferFromFn.callAsync();
+            const receipt = await bridgeTransferFromFn.awaitTransactionSuccessAsync();
+            return {
+                opts: _opts,
+                result,
+                logs: (receipt.logs as any) as DecodedLogs,
+                blocktime: await env.web3Wrapper.getBlockTimestampAsync(receipt.blockNumber),
+            };
+        }
+
+        it('returns magic bytes on success', async () => {
+            const { result } = await transferFromAsync();
+            expect(result).to.eq(AssetProxyId.ERC20Bridge);
+        });
+
+        it('performs transfer when both tokens are the same', async () => {
+            const createTokenFn = testContract.createToken(constants.NULL_ADDRESS);
+            const tokenAddress = await createTokenFn.callAsync();
+            await createTokenFn.awaitTransactionSuccessAsync();
+
+            const { opts, result, logs } = await transferFromAsync({
+                tokenAddressesPath: [tokenAddress, tokenAddress],
+            });
+            expect(result).to.eq(AssetProxyId.ERC20Bridge, 'asset proxy id');
+            const transfers = filterLogsToArguments<TokenTransferArgs>(logs, ContractEvents.TokenTransfer);
+
+            expect(transfers.length).to.eq(1);
+            expect(transfers[0].token).to.eq(tokenAddress, 'input token address');
+            expect(transfers[0].from).to.eq(testContract.address);
+            expect(transfers[0].to).to.eq(opts.toAddress, 'recipient address');
+            expect(transfers[0].amount).to.bignumber.eq(opts.amount, 'amount');
+        });
+
+        describe('token -> token', async () => {
+            it('calls UniswapV2Router01.swapExactTokensForTokens()', async () => {
+                const { opts, result, logs, blocktime } = await transferFromAsync();
+                expect(result).to.eq(AssetProxyId.ERC20Bridge, 'asset proxy id');
+                const transfers = filterLogsToArguments<SwapExactTokensForTokensArgs>(
+                    logs,
+                    ContractEvents.SwapExactTokensForTokensInput,
+                );
+
+                expect(transfers.length).to.eq(1);
+                expect(transfers[0].toTokenAddress).to.eq(
+                    opts.tokenAddressesPath[opts.tokenAddressesPath.length - 1],
+                    'output token address',
+                );
+                expect(transfers[0].to).to.eq(opts.toAddress, 'recipient address');
+                expect(transfers[0].amountIn).to.bignumber.eq(opts.fromTokenBalance, 'input token amount');
+                expect(transfers[0].amountOutMin).to.bignumber.eq(opts.amount, 'output token amount');
+                expect(transfers[0].deadline).to.bignumber.eq(blocktime, 'deadline');
+            });
+
+            it('sets allowance for "from" token', async () => {
+                const { logs } = await transferFromAsync();
+                const approvals = filterLogsToArguments<TokenApproveArgs>(logs, ContractEvents.TokenApprove);
+                const routerAddress = await testContract.getRouterAddress().callAsync();
+                expect(approvals.length).to.eq(1);
+                expect(approvals[0].spender).to.eq(routerAddress);
+                expect(approvals[0].allowance).to.bignumber.eq(constants.MAX_UINT256);
+            });
+
+            it('sets allowance for "from" token on subsequent calls', async () => {
+                const { opts } = await transferFromAsync();
+                const { logs } = await transferFromAsync(opts);
+                const approvals = filterLogsToArguments<TokenApproveArgs>(logs, ContractEvents.TokenApprove);
+                const routerAddress = await testContract.getRouterAddress().callAsync();
+                expect(approvals.length).to.eq(1);
+                expect(approvals[0].spender).to.eq(routerAddress);
+                expect(approvals[0].allowance).to.bignumber.eq(constants.MAX_UINT256);
+            });
+
+            it('fails if the router fails', async () => {
+                const revertReason = 'FOOBAR';
+                const tx = transferFromAsync({
+                    routerRevertReason: revertReason,
+                });
+                return expect(tx).to.eventually.be.rejectedWith(revertReason);
+            });
+        });
+        describe('token -> token -> token', async () => {
+            it('calls UniswapV2Router01.swapExactTokensForTokens()', async () => {
+                const { opts, result, logs, blocktime } = await transferFromAsync({
+                    tokenAddressesPath: Array(3).fill(constants.NULL_ADDRESS),
+                });
+                expect(result).to.eq(AssetProxyId.ERC20Bridge, 'asset proxy id');
+                const transfers = filterLogsToArguments<SwapExactTokensForTokensArgs>(
+                    logs,
+                    ContractEvents.SwapExactTokensForTokensInput,
+                );
+
+                expect(transfers.length).to.eq(1);
+                expect(transfers[0].toTokenAddress).to.eq(
+                    opts.tokenAddressesPath[opts.tokenAddressesPath.length - 1],
+                    'output token address',
+                );
+                expect(transfers[0].to).to.eq(opts.toAddress, 'recipient address');
+                expect(transfers[0].amountIn).to.bignumber.eq(opts.fromTokenBalance, 'input token amount');
+                expect(transfers[0].amountOutMin).to.bignumber.eq(opts.amount, 'output token amount');
+                expect(transfers[0].deadline).to.bignumber.eq(blocktime, 'deadline');
+            });
+        });
+    });
+});

contracts/asset-proxy/test/wrappers.ts

@@ -4,6 +4,8 @@
  * -----------------------------------------------------------------------------
  */
 export * from '../test/generated-wrappers/chai_bridge';
+export * from '../test/generated-wrappers/curve_bridge';
+export * from '../test/generated-wrappers/dex_forwarder_bridge';
 export * from '../test/generated-wrappers/dydx_bridge';
 export * from '../test/generated-wrappers/erc1155_proxy';
 export * from '../test/generated-wrappers/erc20_bridge_proxy';
@@ -15,24 +17,31 @@ export * from '../test/generated-wrappers/i_asset_proxy';
 export * from '../test/generated-wrappers/i_asset_proxy_dispatcher';
 export * from '../test/generated-wrappers/i_authorizable';
 export * from '../test/generated-wrappers/i_chai';
+export * from '../test/generated-wrappers/i_curve';
 export * from '../test/generated-wrappers/i_dydx';
 export * from '../test/generated-wrappers/i_dydx_bridge';
 export * from '../test/generated-wrappers/i_erc20_bridge';
 export * from '../test/generated-wrappers/i_eth2_dai';
+export * from '../test/generated-wrappers/i_gas_token';
 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/i_uniswap_v2_router01';
 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/mixin_gas_token';
 export * from '../test/generated-wrappers/multi_asset_proxy';
 export * from '../test/generated-wrappers/ownable';
 export * from '../test/generated-wrappers/static_call_proxy';
 export * from '../test/generated-wrappers/test_chai_bridge';
+export * from '../test/generated-wrappers/test_dex_forwarder_bridge';
 export * from '../test/generated-wrappers/test_dydx_bridge';
 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/test_uniswap_v2_bridge';
 export * from '../test/generated-wrappers/uniswap_bridge';
+export * from '../test/generated-wrappers/uniswap_v2_bridge';

contracts/asset-proxy/tsconfig.json

@@ -4,6 +4,8 @@
     "include": ["./src/**/*", "./test/**/*", "./generated-wrappers/**/*"],
     "files": [
         "generated-artifacts/ChaiBridge.json",
+        "generated-artifacts/CurveBridge.json",
+        "generated-artifacts/DexForwarderBridge.json",
         "generated-artifacts/DydxBridge.json",
         "generated-artifacts/ERC1155Proxy.json",
         "generated-artifacts/ERC20BridgeProxy.json",
@@ -15,28 +17,37 @@
         "generated-artifacts/IAssetProxyDispatcher.json",
         "generated-artifacts/IAuthorizable.json",
         "generated-artifacts/IChai.json",
+        "generated-artifacts/ICurve.json",
         "generated-artifacts/IDydx.json",
         "generated-artifacts/IDydxBridge.json",
         "generated-artifacts/IERC20Bridge.json",
         "generated-artifacts/IEth2Dai.json",
+        "generated-artifacts/IGasToken.json",
         "generated-artifacts/IKyberNetworkProxy.json",
         "generated-artifacts/IUniswapExchange.json",
         "generated-artifacts/IUniswapExchangeFactory.json",
+        "generated-artifacts/IUniswapV2Router01.json",
         "generated-artifacts/KyberBridge.json",
         "generated-artifacts/MixinAssetProxyDispatcher.json",
         "generated-artifacts/MixinAuthorizable.json",
+        "generated-artifacts/MixinGasToken.json",
         "generated-artifacts/MultiAssetProxy.json",
         "generated-artifacts/Ownable.json",
         "generated-artifacts/StaticCallProxy.json",
         "generated-artifacts/TestChaiBridge.json",
+        "generated-artifacts/TestDexForwarderBridge.json",
         "generated-artifacts/TestDydxBridge.json",
         "generated-artifacts/TestERC20Bridge.json",
         "generated-artifacts/TestEth2DaiBridge.json",
         "generated-artifacts/TestKyberBridge.json",
         "generated-artifacts/TestStaticCallTarget.json",
         "generated-artifacts/TestUniswapBridge.json",
+        "generated-artifacts/TestUniswapV2Bridge.json",
         "generated-artifacts/UniswapBridge.json",
+        "generated-artifacts/UniswapV2Bridge.json",
         "test/generated-artifacts/ChaiBridge.json",
+        "test/generated-artifacts/CurveBridge.json",
+        "test/generated-artifacts/DexForwarderBridge.json",
         "test/generated-artifacts/DydxBridge.json",
         "test/generated-artifacts/ERC1155Proxy.json",
         "test/generated-artifacts/ERC20BridgeProxy.json",
@@ -48,27 +59,34 @@
         "test/generated-artifacts/IAssetProxyDispatcher.json",
         "test/generated-artifacts/IAuthorizable.json",
         "test/generated-artifacts/IChai.json",
+        "test/generated-artifacts/ICurve.json",
         "test/generated-artifacts/IDydx.json",
         "test/generated-artifacts/IDydxBridge.json",
         "test/generated-artifacts/IERC20Bridge.json",
         "test/generated-artifacts/IEth2Dai.json",
+        "test/generated-artifacts/IGasToken.json",
         "test/generated-artifacts/IKyberNetworkProxy.json",
         "test/generated-artifacts/IUniswapExchange.json",
         "test/generated-artifacts/IUniswapExchangeFactory.json",
+        "test/generated-artifacts/IUniswapV2Router01.json",
         "test/generated-artifacts/KyberBridge.json",
         "test/generated-artifacts/MixinAssetProxyDispatcher.json",
         "test/generated-artifacts/MixinAuthorizable.json",
+        "test/generated-artifacts/MixinGasToken.json",
         "test/generated-artifacts/MultiAssetProxy.json",
         "test/generated-artifacts/Ownable.json",
         "test/generated-artifacts/StaticCallProxy.json",
         "test/generated-artifacts/TestChaiBridge.json",
+        "test/generated-artifacts/TestDexForwarderBridge.json",
         "test/generated-artifacts/TestDydxBridge.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"
+        "test/generated-artifacts/TestUniswapV2Bridge.json",
+        "test/generated-artifacts/UniswapBridge.json",
+        "test/generated-artifacts/UniswapV2Bridge.json"
     ],
     "exclude": ["./deploy/solc/solc_bin"]
 }

contracts/broker/CHANGELOG.json

@@ -1,4 +1,60 @@
 [
+    {
+        "version": "1.1.5",
+        "changes": [
+            {
+                "note": "Fix broken tests.",
+                "pr": 2591
+            }
+        ],
+        "timestamp": 1592969527
+    },
+    {
+        "timestamp": 1583220306,
+        "version": "1.1.4",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1582837861,
+        "version": "1.1.3",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1582677073,
+        "version": "1.1.2",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1582623685,
+        "version": "1.1.1",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "version": "1.1.0",
+        "changes": [
+            {
+                "note": "Added decoders for broker data",
+                "pr": 2484
+            }
+        ],
+        "timestamp": 1581748629
+    },
     {
         "timestamp": 1581204851,
         "version": "1.0.2",

contracts/broker/CHANGELOG.md

@@ -5,6 +5,30 @@ Edit the package's CHANGELOG.json file only.
 
 CHANGELOG
 
+## v1.1.5 - _June 24, 2020_
+
+    * Fix broken tests. (#2591)
+
+## v1.1.4 - _March 3, 2020_
+
+    * Dependencies updated
+
+## v1.1.3 - _February 27, 2020_
+
+    * Dependencies updated
+
+## v1.1.2 - _February 26, 2020_
+
+    * Dependencies updated
+
+## v1.1.1 - _February 25, 2020_
+
+    * Dependencies updated
+
+## v1.1.0 - _February 15, 2020_
+
+    * Added decoders for broker data (#2484)
+
 ## v1.0.2 - _February 8, 2020_
 
     * Dependencies updated

contracts/broker/compiler.json

@@ -3,6 +3,7 @@
     "contractsDir": "./contracts",
     "useDockerisedSolc": false,
     "isOfflineMode": false,
+    "shouldSaveStandardInput": true,
     "compilerSettings": {
         "evmVersion": "istanbul",
         "optimizer": {

contracts/broker/package.json

@@ -1,6 +1,6 @@
 {
     "name": "@0x/contracts-broker",
-    "version": "1.0.2",
+    "version": "1.1.5",
     "engines": {
         "node": ">=6.12"
     },
@@ -51,20 +51,20 @@
     },
     "homepage": "https://github.com/0xProject/0x-monorepo/contracts/extensions/README.md",
     "devDependencies": {
-        "@0x/abi-gen": "^5.2.0",
-        "@0x/contracts-asset-proxy": "^3.2.0",
-        "@0x/contracts-erc20": "^3.1.0",
-        "@0x/contracts-erc721": "^3.1.0",
-        "@0x/contracts-exchange": "^3.2.0",
-        "@0x/contracts-exchange-libs": "^4.3.0",
-        "@0x/contracts-gen": "^2.0.7",
-        "@0x/contracts-test-utils": "^5.1.4",
-        "@0x/contracts-utils": "^4.3.0",
-        "@0x/sol-compiler": "^4.0.7",
+        "@0x/abi-gen": "^5.3.0",
+        "@0x/contracts-asset-proxy": "^3.3.0",
+        "@0x/contracts-erc20": "^3.2.0",
+        "@0x/contracts-erc721": "^3.1.6",
+        "@0x/contracts-exchange": "^3.2.6",
+        "@0x/contracts-exchange-libs": "^4.3.6",
+        "@0x/contracts-gen": "^2.0.9",
+        "@0x/contracts-test-utils": "^5.3.3",
+        "@0x/contracts-utils": "^4.5.0",
+        "@0x/sol-compiler": "^4.1.0",
         "@0x/ts-doc-gen": "^0.0.22",
         "@0x/tslint-config": "^4.0.0",
-        "@0x/types": "^3.1.2",
-        "@0x/web3-wrapper": "^7.0.6",
+        "@0x/types": "^3.1.3",
+        "@0x/web3-wrapper": "^7.1.0",
         "@types/lodash": "4.14.104",
         "@types/mocha": "^5.2.7",
         "@types/node": "*",
@@ -84,11 +84,11 @@
         "typescript": "3.0.1"
     },
     "dependencies": {
-        "@0x/base-contract": "^6.2.0",
-        "@0x/order-utils": "^10.2.0",
-        "@0x/typescript-typings": "^5.0.2",
-        "@0x/utils": "^5.4.0",
-        "ethereum-types": "^3.1.0"
+        "@0x/base-contract": "^6.2.2",
+        "@0x/order-utils": "^10.2.5",
+        "@0x/typescript-typings": "^5.1.0",
+        "@0x/utils": "^5.5.0",
+        "ethereum-types": "^3.1.1"
     },
     "publishConfig": {
         "access": "public"

contracts/broker/src/gods_unchained_utils.ts

@@ -1,42 +1,59 @@
 import { assetDataUtils } from '@0x/order-utils';
+import { ERC1155AssetData } from '@0x/types';
 import { AbiEncoder, BigNumber } from '@0x/utils';
 
-export const godsUnchainedUtils = {
-    /**
-     * Encodes the given proto and quality into the bytes format expected by the GodsUnchainedValidator.
-     */
-    encodePropertyData(proto: BigNumber, quality: BigNumber): string {
-        return AbiEncoder.create([{ name: 'proto', type: 'uint16' }, { name: 'quality', type: 'uint8' }]).encode({
-            proto,
-            quality,
-        });
-    },
-    /**
-     * Encodes the given proto and quality into ERC1155 asset data to be used as the takerAssetData
-     * of a property-based GodsUnchained order. Must also provide the addresses of the Broker,
-     * GodsUnchained, and GodsUnchainedValidator contracts. The optional bundleSize parameter specifies
-     * how many cards are expected for each "unit" of the takerAssetAmount. For example, If the
-     * takerAssetAmount is 3 and the bundleSize is 2, the taker must provide 2, 4, or 6 cards
-     * with the given proto and quality to fill the order. If an odd number is provided, the fill fails.
-     */
-    encodeBrokerAssetData(
-        brokerAddress: string,
-        godsUnchainedAddress: string,
-        validatorAddress: string,
-        proto: BigNumber,
-        quality: BigNumber,
-        bundleSize: number = 1,
-    ): string {
-        const dataEncoder = AbiEncoder.create([
-            { name: 'godsUnchainedAddress', type: 'address' },
-            { name: 'validatorAddress', type: 'address' },
-            { name: 'propertyData', type: 'bytes' },
-        ]);
-        const propertyData = AbiEncoder.create([
-            { name: 'proto', type: 'uint16' },
-            { name: 'quality', type: 'uint8' },
-        ]).encode({ proto, quality });
-        const data = dataEncoder.encode({ godsUnchainedAddress, validatorAddress, propertyData });
-        return assetDataUtils.encodeERC1155AssetData(brokerAddress, [], [new BigNumber(bundleSize)], data);
-    },
-};
+export interface GodsUnchainedProperties {
+    proto: BigNumber | number;
+    quality: BigNumber | number;
+}
+
+const propertyDataEncoder = AbiEncoder.create([{ name: 'proto', type: 'uint16' }, { name: 'quality', type: 'uint8' }]);
+const brokerDataEncoder = AbiEncoder.create([
+    { name: 'godsUnchainedAddress', type: 'address' },
+    { name: 'validatorAddress', type: 'address' },
+    { name: 'propertyData', type: 'bytes' },
+]);
+
+/**
+ * Encodes the given proto and quality into the bytes format expected by the GodsUnchainedValidator.
+ */
+export function encodePropertyData(properties: GodsUnchainedProperties): string {
+    return propertyDataEncoder.encode(properties);
+}
+
+/**
+ * Encodes the given proto and quality into ERC1155 asset data to be used as the takerAssetData
+ * of a property-based GodsUnchained order. Must also provide the addresses of the Broker,
+ * GodsUnchained, and GodsUnchainedValidator contracts. The optional bundleSize parameter specifies
+ * how many cards are expected for each "unit" of the takerAssetAmount. For example, If the
+ * takerAssetAmount is 3 and the bundleSize is 2, the taker must provide 2, 4, or 6 cards
+ * with the given proto and quality to fill the order. If an odd number is provided, the fill fails.
+ */
+export function encodeBrokerAssetData(
+    brokerAddress: string,
+    godsUnchainedAddress: string,
+    validatorAddress: string,
+    properties: GodsUnchainedProperties,
+    bundleSize: number = 1,
+): string {
+    const propertyData = propertyDataEncoder.encode(properties);
+    const brokerData = brokerDataEncoder.encode({ godsUnchainedAddress, validatorAddress, propertyData });
+    return assetDataUtils.encodeERC1155AssetData(brokerAddress, [], [new BigNumber(bundleSize)], brokerData);
+}
+
+/**
+ * Decodes proto and quality from the bytes format expected by the GodsUnchainedValidator.
+ */
+export function decodePropertyData(propertyData: string): GodsUnchainedProperties {
+    return propertyDataEncoder.decode(propertyData);
+}
+
+/**
+ * Decodes proto and quality from the ERC1155 takerAssetData of a property-based GodsUnchained order.
+ */
+export function decodeBrokerAssetData(brokerAssetData: string): GodsUnchainedProperties {
+    // tslint:disable-next-line:no-unnecessary-type-assertion
+    const { callbackData: brokerData } = assetDataUtils.decodeAssetDataOrThrow(brokerAssetData) as ERC1155AssetData;
+    const { propertyData } = brokerDataEncoder.decode(brokerData);
+    return decodePropertyData(propertyData);
+}

contracts/broker/src/index.ts

@@ -1,6 +1,6 @@
 export { artifacts } from './artifacts';
 export { BrokerContract, GodsUnchainedValidatorContract, TestGodsUnchainedContract } from './wrappers';
-export { godsUnchainedUtils } from './gods_unchained_utils';
+export * from './gods_unchained_utils';
 export { BrokerRevertErrors } from '@0x/utils';
 export {
     ContractArtifact,

contracts/broker/test/gods_unchained_validator_test.ts

@@ -2,7 +2,7 @@ import { blockchainTests, constants, expect, getRandomInteger } from '@0x/contra
 import { BigNumber } from '@0x/utils';
 import * as _ from 'lodash';
 
-import { godsUnchainedUtils } from '../src/gods_unchained_utils';
+import { encodePropertyData } from '../src/gods_unchained_utils';
 
 import { artifacts } from './artifacts';
 import { GodsUnchainedValidatorContract, TestGodsUnchainedContract } from './wrappers';
@@ -33,7 +33,7 @@ blockchainTests.resets('GodsUnchainedValidator unit tests', env => {
     describe('checkBrokerAsset', () => {
         const proto = new BigNumber(42);
         const quality = new BigNumber(7);
-        const propertyData = godsUnchainedUtils.encodePropertyData(proto, quality);
+        const propertyData = encodePropertyData({ proto, quality });
 
         it('succeeds if assetData proto and quality match propertyData', async () => {
             const tokenId = getRandomInteger(0, constants.MAX_UINT256);
@@ -44,13 +44,13 @@ blockchainTests.resets('GodsUnchainedValidator unit tests', env => {
             const tokenId = getRandomInteger(0, constants.MAX_UINT256);
             await godsUnchained.setTokenProperties(tokenId, proto.plus(1), quality).awaitTransactionSuccessAsync();
             const tx = validator.checkBrokerAsset(tokenId, propertyData).callAsync();
-            expect(tx).to.revertWith('PROTO_MISMATCH');
+            expect(tx).to.revertWith('GodsUnchainedValidator/PROTO_MISMATCH');
         });
         it("reverts if assetData quality doesn't match proeprtyData", async () => {
             const tokenId = getRandomInteger(0, constants.MAX_UINT256);
             await godsUnchained.setTokenProperties(tokenId, proto, quality.plus(1)).awaitTransactionSuccessAsync();
             const tx = validator.checkBrokerAsset(tokenId, propertyData).callAsync();
-            expect(tx).to.revertWith('QUALITY_MISMATCH');
+            expect(tx).to.revertWith('GodsUnchainedValidator/QUALITY_MISMATCH');
         });
     });
 });

contracts/coordinator/CHANGELOG.json

@@ -1,4 +1,58 @@
 [
+    {
+        "timestamp": 1592969527,
+        "version": "3.1.6",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1583220306,
+        "version": "3.1.5",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1582837861,
+        "version": "3.1.4",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1582677073,
+        "version": "3.1.3",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1582623685,
+        "version": "3.1.2",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1581748629,
+        "version": "3.1.1",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
     {
         "version": "3.1.0",
         "changes": [

contracts/coordinator/CHANGELOG.md

@@ -5,6 +5,30 @@ Edit the package's CHANGELOG.json file only.
 
 CHANGELOG
 
+## v3.1.6 - _June 24, 2020_
+
+    * Dependencies updated
+
+## v3.1.5 - _March 3, 2020_
+
+    * Dependencies updated
+
+## v3.1.4 - _February 27, 2020_
+
+    * Dependencies updated
+
+## v3.1.3 - _February 26, 2020_
+
+    * Dependencies updated
+
+## v3.1.2 - _February 25, 2020_
+
+    * Dependencies updated
+
+## v3.1.1 - _February 15, 2020_
+
+    * Dependencies updated
+
 ## v3.1.0 - _February 8, 2020_
 
     * Update tests. (#2462)

contracts/coordinator/compiler.json

@@ -2,6 +2,7 @@
     "artifactsDir": "./test/generated-artifacts",
     "contractsDir": "./contracts",
     "useDockerisedSolc": false,
+    "shouldSaveStandardInput": true,
     "compilerSettings": {
         "evmVersion": "istanbul",
         "optimizer": {

contracts/coordinator/package.json

@@ -1,6 +1,6 @@
 {
     "name": "@0x/contracts-coordinator",
-    "version": "3.1.0",
+    "version": "3.1.6",
     "engines": {
         "node": ">=6.12"
     },
@@ -52,19 +52,19 @@
     },
     "homepage": "https://github.com/0xProject/0x-monorepo/contracts/extensions/README.md",
     "devDependencies": {
-        "@0x/abi-gen": "^5.2.0",
-        "@0x/contracts-asset-proxy": "^3.2.0",
-        "@0x/contracts-dev-utils": "^1.1.0",
-        "@0x/contracts-erc20": "^3.1.0",
-        "@0x/contracts-exchange": "^3.2.0",
-        "@0x/contracts-gen": "^2.0.7",
-        "@0x/contracts-test-utils": "^5.1.4",
-        "@0x/dev-utils": "^3.2.0",
-        "@0x/order-utils": "^10.2.0",
-        "@0x/sol-compiler": "^4.0.7",
+        "@0x/abi-gen": "^5.3.0",
+        "@0x/contracts-asset-proxy": "^3.3.0",
+        "@0x/contracts-dev-utils": "^1.3.4",
+        "@0x/contracts-erc20": "^3.2.0",
+        "@0x/contracts-exchange": "^3.2.6",
+        "@0x/contracts-gen": "^2.0.9",
+        "@0x/contracts-test-utils": "^5.3.3",
+        "@0x/dev-utils": "^3.2.2",
+        "@0x/order-utils": "^10.2.5",
+        "@0x/sol-compiler": "^4.1.0",
         "@0x/ts-doc-gen": "^0.0.22",
         "@0x/tslint-config": "^4.0.0",
-        "@0x/web3-wrapper": "^7.0.6",
+        "@0x/web3-wrapper": "^7.1.0",
         "@types/lodash": "4.14.104",
         "@types/mocha": "^5.2.7",
         "@types/node": "*",
@@ -84,15 +84,15 @@
         "typescript": "3.0.1"
     },
     "dependencies": {
-        "@0x/assert": "^3.0.6",
-        "@0x/base-contract": "^6.2.0",
-        "@0x/contract-addresses": "^4.5.0",
-        "@0x/contracts-utils": "^4.3.0",
-        "@0x/json-schemas": "^5.0.6",
-        "@0x/types": "^3.1.2",
-        "@0x/typescript-typings": "^5.0.2",
-        "@0x/utils": "^5.4.0",
-        "ethereum-types": "^3.1.0",
+        "@0x/assert": "^3.0.8",
+        "@0x/base-contract": "^6.2.2",
+        "@0x/contract-addresses": "^4.10.0",
+        "@0x/contracts-utils": "^4.5.0",
+        "@0x/json-schemas": "^5.0.8",
+        "@0x/types": "^3.1.3",
+        "@0x/typescript-typings": "^5.1.0",
+        "@0x/utils": "^5.5.0",
+        "ethereum-types": "^3.1.1",
         "http-status-codes": "^1.3.2"
     },
     "publishConfig": {

contracts/dev-utils/CHANGELOG.json

@@ -1,4 +1,68 @@
 [
+    {
+        "timestamp": 1592969527,
+        "version": "1.3.4",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1583220306,
+        "version": "1.3.3",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1582837861,
+        "version": "1.3.2",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1582677073,
+        "version": "1.3.1",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "version": "1.3.0",
+        "changes": [
+            {
+                "note": "Update `DevUtils` addresses in `DeploymentConstants`",
+                "pr": 2493
+            }
+        ],
+        "timestamp": 1582623685
+    },
+    {
+        "version": "1.2.0",
+        "changes": [
+            {
+                "note": "Add `DydxBridge` order validation",
+                "pr": 2466
+            }
+        ]
+    },
+    {
+        "timestamp": 1581748629,
+        "version": "1.1.1",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
     {
         "version": "1.1.0",
         "changes": [

contracts/dev-utils/CHANGELOG.md

@@ -5,6 +5,34 @@ Edit the package's CHANGELOG.json file only.
 
 CHANGELOG
 
+## v1.3.4 - _June 24, 2020_
+
+    * Dependencies updated
+
+## v1.3.3 - _March 3, 2020_
+
+    * Dependencies updated
+
+## v1.3.2 - _February 27, 2020_
+
+    * Dependencies updated
+
+## v1.3.1 - _February 26, 2020_
+
+    * Dependencies updated
+
+## v1.3.0 - _February 25, 2020_
+
+    * Update `DevUtils` addresses in `DeploymentConstants` (#2493)
+
+## v1.2.0 - _Invalid date_
+
+    * Add `DydxBridge` order validation (#2466)
+
+## v1.1.1 - _February 15, 2020_
+
+    * Dependencies updated
+
 ## v1.1.0 - _February 8, 2020_
 
     * Refactor mixins into public libraries. (#2464)

contracts/dev-utils/compiler.json

@@ -3,6 +3,7 @@
     "contractsDir": "./contracts",
     "useDockerisedSolc": false,
     "isOfflineMode": false,
+    "shouldSaveStandardInput": true,
     "compilerSettings": {
         "evmVersion": "istanbul",
         "optimizer": {

contracts/dev-utils/contracts/src/Addresses.sol

@@ -34,15 +34,18 @@ contract Addresses is
     address public erc1155ProxyAddress;
     address public staticCallProxyAddress;
     address public chaiBridgeAddress;
+    address public dydxBridgeAddress;
 
     constructor (
         address exchange_,
-        address chaiBridge_
+        address chaiBridge_,
+        address dydxBridge_
     )
         public
     {
         exchangeAddress = exchange_;
         chaiBridgeAddress = chaiBridge_;
+        dydxBridgeAddress = dydxBridge_;
         erc20ProxyAddress = IExchange(exchange_).getAssetProxy(IAssetData(address(0)).ERC20Token.selector);
         erc721ProxyAddress = IExchange(exchange_).getAssetProxy(IAssetData(address(0)).ERC721Token.selector);
         erc1155ProxyAddress = IExchange(exchange_).getAssetProxy(IAssetData(address(0)).ERC1155Assets.selector);

contracts/dev-utils/contracts/src/AssetBalance.sol

@@ -28,7 +28,7 @@ import "@0x/contracts-erc1155/contracts/src/interfaces/IERC1155.sol";
 import "@0x/contracts-asset-proxy/contracts/src/interfaces/IChai.sol";
 import "@0x/contracts-exchange-libs/contracts/src/LibMath.sol";
 import "./Addresses.sol";
-import "./LibAssetData.sol";
+import "./LibDydxBalance.sol";
 
 
 contract AssetBalance is
@@ -269,11 +269,14 @@ contract AssetBalance is
 
         } else if (assetProxyId == IAssetData(address(0)).ERC20Bridge.selector) {
             // Get address of ERC20 token and bridge contract
-            (, address tokenAddress, address bridgeAddress,) = LibAssetData.decodeERC20BridgeAssetData(assetData);
+            (, address tokenAddress, address bridgeAddress,) =
+                LibAssetData.decodeERC20BridgeAssetData(assetData);
             if (tokenAddress == _getDaiAddress() && bridgeAddress == chaiBridgeAddress) {
                 uint256 chaiAllowance = LibERC20Token.allowance(_getChaiAddress(), ownerAddress, chaiBridgeAddress);
                 // Dai allowance is unlimited if Chai allowance is unlimited
                 allowance = chaiAllowance == _MAX_UINT256 ? _MAX_UINT256 : _convertChaiToDaiAmount(chaiAllowance);
+            } else if (bridgeAddress == dydxBridgeAddress) {
+                allowance = LibDydxBalance.getDydxMakerAllowance(ownerAddress, bridgeAddress, _getDydxAddress());
             }
             // Allowance will be 0 if bridge is not supported
         }
@@ -366,6 +369,17 @@ contract AssetBalance is
         if (order.makerAssetData.length < 4) {
             return (0, 0);
         }
+        bytes4 assetProxyId = order.makerAssetData.readBytes4(0);
+        // Handle dydx bridge assets.
+        if (assetProxyId == IAssetData(address(0)).ERC20Bridge.selector) {
+            (, , address bridgeAddress, ) = LibAssetData.decodeERC20BridgeAssetData(order.makerAssetData);
+            if (bridgeAddress == dydxBridgeAddress) {
+                return (
+                    LibDydxBalance.getDydxMakerBalance(order, _getDydxAddress()),
+                    getAssetProxyAllowance(order.makerAddress, order.makerAssetData)
+                );
+            }
+        }
         return (
             getBalance(order.makerAddress, order.makerAssetData),
             getAssetProxyAllowance(order.makerAddress, order.makerAssetData)

contracts/dev-utils/contracts/src/DevUtils.sol

@@ -40,12 +40,14 @@ contract DevUtils is
 {
     constructor (
         address exchange_,
-        address chaiBridge_
+        address chaiBridge_,
+        address dydxBridge_
     )
         public
         Addresses(
             exchange_,
-            chaiBridge_
+            chaiBridge_,
+            dydxBridge_
         )
         LibEIP712ExchangeDomain(uint256(0), address(0)) // null args because because we only use constants
     {}

contracts/dev-utils/contracts/src/LibDydxBalance.sol

@@ -0,0 +1,436 @@
+/*
+
+  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 ^0.5.16;
+pragma experimental ABIEncoderV2;
+
+import "@0x/contracts-asset-proxy/contracts/src/interfaces/IAssetData.sol";
+import "@0x/contracts-asset-proxy/contracts/src/interfaces/IDydxBridge.sol";
+import "@0x/contracts-asset-proxy/contracts/src/interfaces/IDydx.sol";
+import "@0x/contracts-erc20/contracts/src/LibERC20Token.sol";
+import "@0x/contracts-exchange-libs/contracts/src/LibOrder.sol";
+import "@0x/contracts-utils/contracts/src/LibBytes.sol";
+import "@0x/contracts-utils/contracts/src/LibSafeMath.sol";
+import "@0x/contracts-utils/contracts/src/D18.sol";
+import "./LibAssetData.sol";
+
+
+library LibDydxBalance {
+
+    using LibBytes for bytes;
+    using LibSafeMath for uint256;
+
+    /// @dev Padding % added to the minimum collateralization ratio to
+    ///      prevent withdrawing exactly the amount that would make an account
+    ///      insolvent. 1 bps.
+    int256 private constant MARGIN_RATIO_PADDING = 0.0001e18;
+
+    /// @dev Structure that holds all pertinent info needed to perform a balance
+    ///      check.
+    struct BalanceCheckInfo {
+        IDydx dydx;
+        address bridgeAddress;
+        address makerAddress;
+        address makerTokenAddress;
+        address takerTokenAddress;
+        int256 orderMakerToTakerRate;
+        uint256[] accounts;
+        IDydxBridge.BridgeAction[] actions;
+    }
+
+    /// @dev Gets the maker asset allowance for a Dydx bridge order.
+    /// @param makerAddress The maker of the order.
+    /// @param bridgeAddress The address of the Dydx bridge.
+    /// @param dydx The Dydx contract address.
+    /// @return allowance The maker asset allowance.
+    function getDydxMakerAllowance(address makerAddress, address bridgeAddress, address dydx)
+        public
+        view
+        returns (uint256 allowance)
+    {
+        // Allowance is infinite if the dydx bridge is an operator for the maker.
+        return IDydx(dydx).getIsLocalOperator(makerAddress, bridgeAddress)
+            ? uint256(-1) : 0;
+    }
+
+    /// @dev Gets the maker allowance for a
+    /// @dev Get the maker asset balance of an order with a `DydxBridge` maker asset.
+    /// @param order An order with a dydx maker asset.
+    /// @param dydx The address of the dydx contract.
+    /// @return balance The maker asset balance.
+    function getDydxMakerBalance(LibOrder.Order memory order, address dydx)
+        public
+        view
+        returns (uint256 balance)
+    {
+        BalanceCheckInfo memory info = _getBalanceCheckInfo(order, dydx);
+        // Actions must be well-formed.
+        if (!_areActionsWellFormed(info)) {
+            return 0;
+        }
+        // If the rate we withdraw maker tokens is less than one, the asset
+        // proxy will throw because we will always transfer less maker tokens
+        // than asked.
+        if (_getMakerTokenWithdrawRate(info) < D18.one()) {
+            return 0;
+        }
+        // The maker balance is the smaller of:
+        return LibSafeMath.min256(
+            // How many times we can execute all the deposit actions.
+            _getDepositableMakerAmount(info),
+            // How many times we can execute all the actions before the an
+            // account becomes undercollateralized.
+            _getSolventMakerAmount(info)
+        );
+    }
+
+    /// @dev Checks that:
+    ///      1. Actions are arranged as [...deposits, withdraw].
+    ///      2. There is only one deposit for each market ID.
+    ///      3. Every action has a valid account index.
+    ///      4. There is exactly one withdraw at the end and it is for the
+    ///         maker token.
+    /// @param info State from `_getBalanceCheckInfo()`.
+    /// @return areWellFormed Whether the actions are well-formed.
+    function _areActionsWellFormed(BalanceCheckInfo memory info)
+        internal
+        view
+        returns (bool areWellFormed)
+    {
+        if (info.actions.length == 0) {
+            return false;
+        }
+        uint256 depositCount = 0;
+        // Count the number of deposits.
+        for (; depositCount < info.actions.length; ++depositCount) {
+            IDydxBridge.BridgeAction memory action = info.actions[depositCount];
+            if (action.actionType != IDydxBridge.BridgeActionType.Deposit) {
+                break;
+            }
+            // Search all prior actions for the same market ID.
+            uint256 marketId = action.marketId;
+            for (uint256 j = 0; j < depositCount; ++j) {
+                if (info.actions[j].marketId == marketId) {
+                    // Market ID is not unique.
+                    return false;
+                }
+            }
+            // Check that the account index is within the valid range.
+            if (action.accountIdx >= info.accounts.length) {
+                return false;
+            }
+        }
+        // There must be exactly one withdraw action at the end.
+        if (depositCount + 1 != info.actions.length) {
+            return false;
+        }
+        IDydxBridge.BridgeAction memory withdraw = info.actions[depositCount];
+        if (withdraw.actionType != IDydxBridge.BridgeActionType.Withdraw) {
+            return false;
+        }
+        // And it must be for the maker token.
+        if (info.dydx.getMarketTokenAddress(withdraw.marketId) != info.makerTokenAddress) {
+            return false;
+        }
+        // Check the account index.
+        return withdraw.accountIdx < info.accounts.length;
+    }
+
+    /// @dev Returns the rate at which we withdraw maker tokens.
+    /// @param info State from `_getBalanceCheckInfo()`.
+    /// @return makerTokenWithdrawRate Maker token withdraw rate.
+    function _getMakerTokenWithdrawRate(BalanceCheckInfo memory info)
+        internal
+        pure
+        returns (int256 makerTokenWithdrawRate)
+    {
+        // The last action is always a withdraw for the maker token.
+        IDydxBridge.BridgeAction memory withdraw = info.actions[info.actions.length - 1];
+        return _getActionRate(withdraw);
+    }
+
+    /// @dev Get how much maker asset we can transfer before a deposit fails.
+    /// @param info State from `_getBalanceCheckInfo()`.
+    function _getDepositableMakerAmount(BalanceCheckInfo memory info)
+        internal
+        view
+        returns (uint256 depositableMakerAmount)
+    {
+        depositableMakerAmount = uint256(-1);
+        // Take the minimum maker amount from all deposits.
+        for (uint256 i = 0; i < info.actions.length; ++i) {
+            IDydxBridge.BridgeAction memory action = info.actions[i];
+            // Only looking at deposit actions.
+            if (action.actionType != IDydxBridge.BridgeActionType.Deposit) {
+                continue;
+            }
+            // `depositRate` is the rate at which we convert a maker token into
+            // a taker token for deposit.
+            int256 depositRate = _getActionRate(action);
+            // Taker tokens will be transferred to the maker for every fill, so
+            // we reduce the effective deposit rate if we're depositing the taker
+            // token.
+            address depositToken = info.dydx.getMarketTokenAddress(action.marketId);
+            if (info.takerTokenAddress != address(0) && depositToken == info.takerTokenAddress) {
+                depositRate = D18.sub(depositRate, info.orderMakerToTakerRate);
+            }
+            // If the deposit rate is > 0, we are limited by the transferrable
+            // token balance of the maker.
+            if (depositRate > 0) {
+                uint256 supply = _getTransferabeTokenAmount(
+                    depositToken,
+                    info.makerAddress,
+                    address(info.dydx)
+                );
+                depositableMakerAmount = LibSafeMath.min256(
+                    depositableMakerAmount,
+                    uint256(D18.div(supply, depositRate))
+                );
+            }
+        }
+    }
+
+    /// @dev Get how much maker asset we can transfer before an account
+    ///      becomes insolvent.
+    /// @param info State from `_getBalanceCheckInfo()`.
+    function _getSolventMakerAmount(BalanceCheckInfo memory info)
+        internal
+        view
+        returns (uint256 solventMakerAmount)
+    {
+        solventMakerAmount = uint256(-1);
+        assert(info.actions.length >= 1);
+        IDydxBridge.BridgeAction memory withdraw = info.actions[info.actions.length - 1];
+        assert(withdraw.actionType == IDydxBridge.BridgeActionType.Withdraw);
+        int256 minCr = D18.add(_getMinimumCollateralizationRatio(info.dydx), MARGIN_RATIO_PADDING);
+        // Loop through the accounts.
+        for (uint256 accountIdx = 0; accountIdx < info.accounts.length; ++accountIdx) {
+            (uint256 supplyValue, uint256 borrowValue) =
+                _getAccountMarketValues(info, info.accounts[accountIdx]);
+            // All accounts must currently be solvent.
+            if (borrowValue != 0 && D18.div(supplyValue, borrowValue) < minCr) {
+                return 0;
+            }
+            // If this is the same account used to in the withdraw/borrow action,
+            // compute the maker amount at which it will become insolvent.
+            if (accountIdx != withdraw.accountIdx) {
+                continue;
+            }
+            // Compute the deposit/collateralization rate, which is the rate at
+            // which (USD) value is added to the account across all markets.
+            int256 dd = 0;
+            for (uint256 i = 0; i < info.actions.length - 1; ++i) {
+                IDydxBridge.BridgeAction memory deposit = info.actions[i];
+                assert(deposit.actionType == IDydxBridge.BridgeActionType.Deposit);
+                if (deposit.accountIdx == accountIdx) {
+                    dd = D18.add(
+                        dd,
+                        _getActionRateValue(
+                            info,
+                            deposit
+                        )
+                    );
+                }
+            }
+            // Compute the borrow/withdraw rate, which is the rate at which
+            // (USD) value is deducted from the account.
+            int256 db = _getActionRateValue(
+                info,
+                withdraw
+            );
+            // If the deposit to withdraw ratio is >= the minimum collateralization
+            // ratio, then we will never become insolvent at these prices.
+            if (D18.div(dd, db) >= minCr) {
+                continue;
+            }
+            // If the adjusted deposit rates are equal, the account will remain
+            // at the same level of collateralization.
+            if (D18.mul(minCr, db) == dd) {
+                continue;
+            }
+            // The collateralization ratio for this account, parameterized by
+            // `t` (maker amount), is given by:
+            //      `cr = (supplyValue + t * dd) / (borrowValue + t * db)`
+            // Solving for `t` gives us:
+            //      `t = (supplyValue - cr * borrowValue) / (cr * db - dd)`
+            int256 t = D18.div(
+                D18.sub(supplyValue, D18.mul(minCr, borrowValue)),
+                D18.sub(D18.mul(minCr, db), dd)
+            );
+            solventMakerAmount = LibSafeMath.min256(
+                solventMakerAmount,
+                // `t` is in maker token units, so convert it to maker wei.
+                _toWei(info.makerTokenAddress, uint256(D18.clip(t)))
+            );
+        }
+    }
+
+    /// @dev Create a `BalanceCheckInfo` struct.
+    /// @param order An order with a `DydxBridge` maker asset.
+    /// @param dydx The address of the Dydx contract.
+    /// @return info The `BalanceCheckInfo` struct.
+    function _getBalanceCheckInfo(LibOrder.Order memory order, address dydx)
+        private
+        pure
+        returns (BalanceCheckInfo memory info)
+    {
+        bytes memory rawBridgeData;
+        (, info.makerTokenAddress, info.bridgeAddress, rawBridgeData) =
+            LibAssetData.decodeERC20BridgeAssetData(order.makerAssetData);
+        info.dydx = IDydx(dydx);
+        info.makerAddress = order.makerAddress;
+        if (order.takerAssetData.length == 36) {
+            if (order.takerAssetData.readBytes4(0) == IAssetData(0).ERC20Token.selector) {
+                (, info.takerTokenAddress) =
+                    LibAssetData.decodeERC20AssetData(order.takerAssetData);
+            }
+        }
+        info.orderMakerToTakerRate = D18.div(order.takerAssetAmount, order.makerAssetAmount);
+        (IDydxBridge.BridgeData memory bridgeData) =
+            abi.decode(rawBridgeData, (IDydxBridge.BridgeData));
+        info.accounts = bridgeData.accountNumbers;
+        info.actions = bridgeData.actions;
+    }
+
+    /// @dev Returns the conversion rate for an action.
+    /// @param action A `BridgeAction`.
+    function _getActionRate(IDydxBridge.BridgeAction memory action)
+        private
+        pure
+        returns (int256 rate)
+    {
+        rate = action.conversionRateDenominator == 0
+            ? D18.one()
+            : D18.div(
+                action.conversionRateNumerator,
+                action.conversionRateDenominator
+            );
+    }
+
+    /// @dev Returns the USD value of an action based on its conversion rate
+    ///      and market prices.
+    /// @param info State from `_getBalanceCheckInfo()`.
+    /// @param action A `BridgeAction`.
+    function _getActionRateValue(
+        BalanceCheckInfo memory info,
+        IDydxBridge.BridgeAction memory action
+    )
+        private
+        view
+        returns (int256 value)
+    {
+        address toToken = info.dydx.getMarketTokenAddress(action.marketId);
+        uint256 fromTokenDecimals = LibERC20Token.decimals(info.makerTokenAddress);
+        uint256 toTokenDecimals = LibERC20Token.decimals(toToken);
+        // First express the rate as 18-decimal units.
+        value = toTokenDecimals > fromTokenDecimals
+            ? int256(
+                uint256(_getActionRate(action))
+                    .safeDiv(10 ** (toTokenDecimals - fromTokenDecimals))
+            )
+            : int256(
+                uint256(_getActionRate(action))
+                    .safeMul(10 ** (fromTokenDecimals - toTokenDecimals))
+            );
+        // Prices have 18 + (18 - TOKEN_DECIMALS) decimal places because
+        // consistency is stupid.
+        uint256 price = info.dydx.getMarketPrice(action.marketId).value;
+        // Make prices have 18 decimals.
+        if (toTokenDecimals > 18) {
+            price = price.safeMul(10 ** (toTokenDecimals - 18));
+        } else {
+            price = price.safeDiv(10 ** (18 - toTokenDecimals));
+        }
+        // The action value is the action rate times the price.
+        value = D18.mul(price, value);
+        // Scale by the market premium.
+        int256 marketPremium = D18.add(
+            D18.one(),
+            info.dydx.getMarketMarginPremium(action.marketId).value
+        );
+        if (action.actionType == IDydxBridge.BridgeActionType.Deposit) {
+            value = D18.div(value, marketPremium);
+        } else {
+            value = D18.mul(value, marketPremium);
+        }
+    }
+
+    /// @dev Convert a `D18` fraction of 1 token to the equivalent integer wei.
+    /// @param token Address the of the token.
+    /// @param units Token units expressed with 18 digit precision.
+    function _toWei(address token, uint256 units)
+        private
+        view
+        returns (uint256 rate)
+    {
+        uint256 decimals = LibERC20Token.decimals(token);
+        rate = decimals > 18
+            ? units.safeMul(10 ** (decimals - 18))
+            : units.safeDiv(10 ** (18 - decimals));
+    }
+
+    /// @dev Get the global minimum collateralization ratio required for
+    ///      an account to be considered solvent.
+    /// @param dydx The Dydx interface.
+    function _getMinimumCollateralizationRatio(IDydx dydx)
+        private
+        view
+        returns (int256 ratio)
+    {
+        IDydx.RiskParams memory riskParams = dydx.getRiskParams();
+        return D18.add(D18.one(), D18.toSigned(riskParams.marginRatio.value));
+    }
+
+    /// @dev Get the total supply and borrow values for an account across all markets.
+    /// @param info State from `_getBalanceCheckInfo()`.
+    /// @param account The Dydx account identifier.
+    function _getAccountMarketValues(BalanceCheckInfo memory info, uint256 account)
+        private
+        view
+        returns (uint256 supplyValue, uint256 borrowValue)
+    {
+        (IDydx.Value memory supplyValue_, IDydx.Value memory borrowValue_) =
+            info.dydx.getAdjustedAccountValues(IDydx.AccountInfo(
+                info.makerAddress,
+                account
+            ));
+        // Account values have 36 decimal places because dydx likes to make sure
+        // you're paying attention.
+        return (supplyValue_.value / 1e18, borrowValue_.value / 1e18);
+    }
+
+    /// @dev Get the amount of an ERC20 token held by `owner` that can be transferred
+    ///      by `spender`.
+    /// @param tokenAddress The address of the ERC20 token.
+    /// @param owner The address of the token holder.
+    /// @param spender The address of the token spender.
+    function _getTransferabeTokenAmount(
+        address tokenAddress,
+        address owner,
+        address spender
+    )
+        private
+        view
+        returns (uint256 transferableAmount)
+    {
+        return LibSafeMath.min256(
+            LibERC20Token.allowance(tokenAddress, owner, spender),
+            LibERC20Token.balanceOf(tokenAddress, owner)
+        );
+    }
+}

contracts/dev-utils/contracts/src/OrderValidationUtils.sol

@@ -118,22 +118,14 @@ contract OrderValidationUtils is
             transferableTakerAssetAmount
         );
 
-        // Execute the maker transfers.
-        fillableTakerAssetAmount = LibOrderTransferSimulation.getSimulatedOrderMakerTransferResults(
-            exchangeAddress,
-            order,
-            order.takerAddress,
-            fillableTakerAssetAmount
-        ) == LibOrderTransferSimulation.OrderTransferResults.TransfersSuccessful ? fillableTakerAssetAmount : 0;
-
-        if (!_isAssetDataValid(order.takerAssetData)) {
-            fillableTakerAssetAmount = 0;
-        }
-
-        if (order.takerFee != 0 && !_isAssetDataValid(order.takerFeeAssetData)) {
+        // Ensure that all of the asset data is valid. Fee asset data only needs
+        // to be valid if the fees are nonzero.
+        if (!_areOrderAssetDatasValid(order)) {
             fillableTakerAssetAmount = 0;
         }
 
+        // If the order is not fillable, then the fillable taker asset amount is
+        // zero by definition.
         if (orderInfo.orderStatus != LibOrder.OrderStatus.FILLABLE) {
             fillableTakerAssetAmount = 0;
         }
@@ -207,7 +199,22 @@ contract OrderValidationUtils is
     {
         (uint256 balance, uint256 allowance) = _getConvertibleMakerBalanceAndAssetProxyAllowance(order);
         transferableAssetAmount = LibSafeMath.min256(balance, allowance);
-        return transferableAssetAmount;
+        return LibSafeMath.min256(transferableAssetAmount, order.makerAssetAmount);
+    }
+
+    /// @dev Checks that the asset data contained in a ZeroEx is valid and returns
+    /// a boolean that indicates whether or not the asset data was found to be valid.
+    /// @param order A ZeroEx order to validate.
+    /// @return The validatity of the asset data.
+    function _areOrderAssetDatasValid(LibOrder.Order memory order)
+        internal
+        pure
+        returns (bool)
+    {
+        return _isAssetDataValid(order.makerAssetData) &&
+            (order.makerFee == 0 || _isAssetDataValid(order.makerFeeAssetData)) &&
+            _isAssetDataValid(order.takerAssetData) &&
+            (order.takerFee == 0 || _isAssetDataValid(order.takerFeeAssetData));
     }
 
     /// @dev This function handles the edge cases around taker validation. This function

contracts/dev-utils/contracts/test/TestDydx.sol

@@ -0,0 +1,181 @@
+/*
+
+  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 ^0.5.16;
+pragma experimental ABIEncoderV2;
+
+import "@0x/contracts-asset-proxy/contracts/src/interfaces/IDydx.sol";
+import "@0x/contracts-erc20/contracts/src/LibERC20Token.sol";
+
+
+// solhint-disable separate-by-one-line-in-contract
+contract TestDydx {
+
+    struct OperatorConfig {
+        address owner;
+        address operator;
+    }
+
+    struct AccountConfig {
+        address owner;
+        uint256 accountId;
+        int256[] balances;
+    }
+
+    struct MarketInfo {
+        address token;
+        uint256 price;
+    }
+
+    struct TestConfig {
+        uint256 marginRatio;
+        OperatorConfig[] operators;
+        AccountConfig[] accounts;
+        MarketInfo[] markets;
+    }
+
+    mapping (bytes32 => bool) private _operators;
+    mapping (bytes32 => int256) private _balance;
+    MarketInfo[] private _markets;
+    uint256 private _marginRatio;
+
+    constructor(TestConfig memory config) public {
+        _marginRatio = config.marginRatio;
+        for (uint256 marketId = 0; marketId < config.markets.length; ++marketId) {
+            _markets.push(config.markets[marketId]);
+        }
+        for (uint256 i = 0; i < config.operators.length; ++i) {
+            OperatorConfig memory op = config.operators[i];
+            _operators[_getOperatorHash(op.owner, op.operator)] = true;
+        }
+        for (uint256 i = 0; i < config.accounts.length; ++i) {
+            AccountConfig memory acct = config.accounts[i];
+            for (uint256 marketId = 0; marketId < acct.balances.length; ++marketId) {
+                _balance[_getBalanceHash(acct.owner, acct.accountId, marketId)] =
+                    acct.balances[marketId];
+            }
+        }
+    }
+
+    function getIsLocalOperator(
+        address owner,
+        address operator
+    )
+        external
+        view
+        returns (bool isLocalOperator)
+    {
+        return _operators[_getOperatorHash(owner, operator)];
+    }
+
+    function getMarketTokenAddress(
+        uint256 marketId
+    )
+        external
+        view
+        returns (address tokenAddress)
+    {
+        return _markets[marketId].token;
+    }
+
+    function getRiskParams()
+        external
+        view
+        returns (IDydx.RiskParams memory riskParams)
+    {
+        return IDydx.RiskParams({
+            marginRatio: IDydx.D256(_marginRatio),
+            liquidationSpread: IDydx.D256(0),
+            earningsRate: IDydx.D256(0),
+            minBorrowedValue: IDydx.Value(0)
+        });
+    }
+
+    function getAdjustedAccountValues(
+        IDydx.AccountInfo calldata account
+    )
+        external
+        view
+        returns (IDydx.Value memory supplyValue, IDydx.Value memory borrowValue)
+    {
+        for (uint256 marketId = 0; marketId < _markets.length; ++marketId) {
+            int256 balance =
+                _balance[_getBalanceHash(account.owner, account.number, marketId)];
+            // Account values have 36 decimal places.
+            // `getMarketPrice()` returns a unit with
+            // 18 + (18 - TOKEN_DECIMALS) decimal places so multiplying the price
+            // with the wei balance will result in a 36 decimal value.
+            balance = balance * int256(getMarketPrice(marketId).value);
+            if (balance >= 0) {
+                supplyValue.value += uint256(balance);
+            } else {
+                borrowValue.value += uint256(-balance);
+            }
+        }
+    }
+
+    function getMarketMarginPremium(uint256)
+        external
+        view
+        returns (IDydx.D256 memory premium)
+    {
+        // Return 0.
+        return premium;
+    }
+
+    function getMarketPrice(
+        uint256 marketId
+    )
+        public
+        view
+        returns (IDydx.Price memory price)
+    {
+        MarketInfo memory market = _markets[marketId];
+        uint256 decimals = LibERC20Token.decimals(market.token);
+        price.value = _markets[marketId].price;
+        // Market prices have 18 + (18 - TOKEN_DECIMALS)
+        if (decimals > 18) {
+            price.value /= 10 ** (decimals - 18);
+        } else {
+            price.value *= 10 ** (18 - decimals);
+        }
+    }
+
+    function _getOperatorHash(address owner, address operator)
+        private
+        pure
+        returns (bytes32 operatorHash)
+    {
+        return keccak256(abi.encode(
+            owner,
+            operator
+        ));
+    }
+
+    function _getBalanceHash(address owner, uint256 accountId, uint256 marketId)
+        private
+        pure
+        returns (bytes32 balanceHash)
+    {
+        return keccak256(abi.encode(
+            owner,
+            accountId,
+            marketId
+        ));
+    }
+}

contracts/dev-utils/contracts/test/TestLibDydxBalance.sol

@@ -0,0 +1,116 @@
+/*
+
+  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 ^0.5.16;
+pragma experimental ABIEncoderV2;
+
+import "../src/LibDydxBalance.sol";
+
+
+contract TestLibDydxBalanceToken {
+
+    uint8 public decimals;
+    mapping (address => uint256) public balanceOf;
+    mapping (address => mapping (address => uint256)) public allowance;
+
+    constructor(uint8 decimals_) public {
+        decimals = decimals_;
+    }
+
+    function setBalance(address owner, uint256 balance) external {
+        balanceOf[owner] = balance;
+    }
+
+    function setApproval(
+        address owner,
+        address spender,
+        uint256 allowance_
+    )
+        external
+    {
+        allowance[owner][spender] = allowance_;
+    }
+}
+
+
+contract TestLibDydxBalance {
+
+    mapping (address => TestLibDydxBalanceToken) private tokens;
+
+    function createToken(uint8 decimals) external returns (address) {
+        TestLibDydxBalanceToken token = new TestLibDydxBalanceToken(decimals);
+        return address(tokens[address(token)] = token);
+    }
+
+    function setTokenBalance(
+        address tokenAddress,
+        address owner,
+        uint256 balance
+    )
+        external
+    {
+        tokens[tokenAddress].setBalance(owner, balance);
+    }
+
+    function setTokenApproval(
+        address tokenAddress,
+        address owner,
+        address spender,
+        uint256 allowance
+    )
+        external
+    {
+        tokens[tokenAddress].setApproval(owner, spender, allowance);
+    }
+
+    function getDydxMakerBalance(LibOrder.Order memory order, address dydx)
+        public
+        view
+        returns (uint256 balance)
+    {
+        return LibDydxBalance.getDydxMakerBalance(order, dydx);
+    }
+
+    function getSolventMakerAmount(
+        LibDydxBalance.BalanceCheckInfo memory info
+    )
+        public
+        view
+        returns (uint256 solventMakerAmount)
+    {
+        return LibDydxBalance._getSolventMakerAmount(info);
+    }
+
+    function getDepositableMakerAmount(
+        LibDydxBalance.BalanceCheckInfo memory info
+    )
+        public
+        view
+        returns (uint256 depositableMakerAmount)
+    {
+        return LibDydxBalance._getDepositableMakerAmount(info);
+    }
+
+    function areActionsWellFormed(LibDydxBalance.BalanceCheckInfo memory info)
+        public
+        view
+        returns (bool areWellFormed)
+    {
+        return LibDydxBalance._areActionsWellFormed(info);
+    }
+}

contracts/dev-utils/package.json

@@ -1,6 +1,6 @@
 {
     "name": "@0x/contracts-dev-utils",
-    "version": "1.1.0",
+    "version": "1.3.4",
     "engines": {
         "node": ">=6.12"
     },
@@ -8,7 +8,7 @@
     "main": "lib/src/index.js",
     "scripts": {
         "build": "yarn pre_build && tsc -b",
-        "test": "yarn assert_deployable",
+        "test": "yarn assert_deployable && yarn mocha -t 10000 -b ./lib/test/**_test.js",
         "assert_deployable": "node -e \"const bytecodeLen = (require('./generated-artifacts/DevUtils.json').compilerOutput.evm.bytecode.object.length-2)/2; assert(bytecodeLen<=0x6000,'DevUtils contract is too big to deploy, per EIP-170. '+bytecodeLen+'>'+0x6000)\"",
         "build:ci": "yarn build",
         "pre_build": "run-s compile quantify_bytecode contracts:gen generate_contract_wrappers contracts:copy",
@@ -27,8 +27,8 @@
         "docs:json": "typedoc --excludePrivate --excludeExternals --excludeProtected --ignoreCompilerErrors --target ES5 --tsconfig typedoc-tsconfig.json --json $JSON_FILE_PATH $PROJECT_FILES"
     },
     "config": {
-        "publicInterfaceContracts": "DevUtils,LibAssetData,LibOrderTransferSimulation,LibTransactionDecoder",
-        "abis": "./test/generated-artifacts/@(Addresses|AssetBalance|DevUtils|EthBalanceChecker|ExternalFunctions|LibAssetData|LibOrderTransferSimulation|LibTransactionDecoder|OrderTransferSimulationUtils|OrderValidationUtils).json",
+        "publicInterfaceContracts": "DevUtils,LibAssetData,LibDydxBalance,LibOrderTransferSimulation,LibTransactionDecoder",
+        "abis": "./test/generated-artifacts/@(Addresses|AssetBalance|DevUtils|EthBalanceChecker|ExternalFunctions|LibAssetData|LibDydxBalance|LibOrderTransferSimulation|LibTransactionDecoder|OrderTransferSimulationUtils|OrderValidationUtils|TestDydx|TestLibDydxBalance).json",
         "abis:comment": "This list is auto-generated by contracts-gen. Don't edit manually."
     },
     "repository": {
@@ -41,19 +41,19 @@
     },
     "homepage": "https://github.com/0xProject/0x-monorepo/contracts/dev-utils/README.md",
     "devDependencies": {
-        "@0x/abi-gen": "^5.2.0",
-        "@0x/assert": "^3.0.6",
-        "@0x/contracts-asset-proxy": "^3.2.0",
-        "@0x/contracts-erc20": "^3.1.0",
-        "@0x/contracts-gen": "^2.0.7",
-        "@0x/contracts-test-utils": "^5.1.4",
-        "@0x/sol-compiler": "^4.0.7",
+        "@0x/abi-gen": "^5.3.0",
+        "@0x/assert": "^3.0.8",
+        "@0x/contracts-asset-proxy": "^3.3.0",
+        "@0x/contracts-erc20": "^3.2.0",
+        "@0x/contracts-gen": "^2.0.9",
+        "@0x/contracts-test-utils": "^5.3.3",
+        "@0x/sol-compiler": "^4.1.0",
         "@0x/ts-doc-gen": "^0.0.22",
         "@0x/tslint-config": "^4.0.0",
-        "@0x/types": "^3.1.2",
-        "@0x/utils": "^5.4.0",
+        "@0x/types": "^3.1.3",
+        "@0x/utils": "^5.5.0",
         "@types/node": "*",
-        "ethereum-types": "^3.1.0",
+        "ethereum-types": "^3.1.1",
         "ethers": "~4.0.4",
         "npm-run-all": "^4.1.2",
         "shx": "^0.2.2",
@@ -64,7 +64,7 @@
         "typescript": "3.0.1"
     },
     "dependencies": {
-        "@0x/base-contract": "^6.2.0"
+        "@0x/base-contract": "^6.2.2"
     },
     "publishConfig": {
         "access": "public"

contracts/dev-utils/src/artifacts.ts

@@ -7,11 +7,13 @@ import { ContractArtifact } from 'ethereum-types';
 
 import * as DevUtils from '../generated-artifacts/DevUtils.json';
 import * as LibAssetData from '../generated-artifacts/LibAssetData.json';
+import * as LibDydxBalance from '../generated-artifacts/LibDydxBalance.json';
 import * as LibOrderTransferSimulation from '../generated-artifacts/LibOrderTransferSimulation.json';
 import * as LibTransactionDecoder from '../generated-artifacts/LibTransactionDecoder.json';
 export const artifacts = {
     DevUtils: DevUtils as ContractArtifact,
     LibAssetData: LibAssetData as ContractArtifact,
+    LibDydxBalance: LibDydxBalance as ContractArtifact,
     LibOrderTransferSimulation: LibOrderTransferSimulation as ContractArtifact,
     LibTransactionDecoder: LibTransactionDecoder as ContractArtifact,
 };

contracts/dev-utils/src/wrappers.ts

@@ -5,5 +5,6 @@
  */
 export * from '../generated-wrappers/dev_utils';
 export * from '../generated-wrappers/lib_asset_data';
+export * from '../generated-wrappers/lib_dydx_balance';
 export * from '../generated-wrappers/lib_order_transfer_simulation';
 export * from '../generated-wrappers/lib_transaction_decoder';

contracts/dev-utils/test/artifacts.ts

@@ -11,10 +11,13 @@ import * as DevUtils from '../test/generated-artifacts/DevUtils.json';
 import * as EthBalanceChecker from '../test/generated-artifacts/EthBalanceChecker.json';
 import * as ExternalFunctions from '../test/generated-artifacts/ExternalFunctions.json';
 import * as LibAssetData from '../test/generated-artifacts/LibAssetData.json';
+import * as LibDydxBalance from '../test/generated-artifacts/LibDydxBalance.json';
 import * as LibOrderTransferSimulation from '../test/generated-artifacts/LibOrderTransferSimulation.json';
 import * as LibTransactionDecoder from '../test/generated-artifacts/LibTransactionDecoder.json';
 import * as OrderTransferSimulationUtils from '../test/generated-artifacts/OrderTransferSimulationUtils.json';
 import * as OrderValidationUtils from '../test/generated-artifacts/OrderValidationUtils.json';
+import * as TestDydx from '../test/generated-artifacts/TestDydx.json';
+import * as TestLibDydxBalance from '../test/generated-artifacts/TestLibDydxBalance.json';
 export const artifacts = {
     Addresses: Addresses as ContractArtifact,
     AssetBalance: AssetBalance as ContractArtifact,
@@ -22,8 +25,11 @@ export const artifacts = {
     EthBalanceChecker: EthBalanceChecker as ContractArtifact,
     ExternalFunctions: ExternalFunctions as ContractArtifact,
     LibAssetData: LibAssetData as ContractArtifact,
+    LibDydxBalance: LibDydxBalance as ContractArtifact,
     LibOrderTransferSimulation: LibOrderTransferSimulation as ContractArtifact,
     LibTransactionDecoder: LibTransactionDecoder as ContractArtifact,
     OrderTransferSimulationUtils: OrderTransferSimulationUtils as ContractArtifact,
     OrderValidationUtils: OrderValidationUtils as ContractArtifact,
+    TestDydx: TestDydx as ContractArtifact,
+    TestLibDydxBalance: TestLibDydxBalance as ContractArtifact,
 };

contracts/dev-utils/test/wrappers.ts

@@ -9,7 +9,10 @@ export * from '../test/generated-wrappers/dev_utils';
 export * from '../test/generated-wrappers/eth_balance_checker';
 export * from '../test/generated-wrappers/external_functions';
 export * from '../test/generated-wrappers/lib_asset_data';
+export * from '../test/generated-wrappers/lib_dydx_balance';
 export * from '../test/generated-wrappers/lib_order_transfer_simulation';
 export * from '../test/generated-wrappers/lib_transaction_decoder';
 export * from '../test/generated-wrappers/order_transfer_simulation_utils';
 export * from '../test/generated-wrappers/order_validation_utils';
+export * from '../test/generated-wrappers/test_dydx';
+export * from '../test/generated-wrappers/test_lib_dydx_balance';

contracts/dev-utils/tsconfig.json

@@ -5,6 +5,7 @@
     "files": [
         "generated-artifacts/DevUtils.json",
         "generated-artifacts/LibAssetData.json",
+        "generated-artifacts/LibDydxBalance.json",
         "generated-artifacts/LibOrderTransferSimulation.json",
         "generated-artifacts/LibTransactionDecoder.json",
         "test/generated-artifacts/Addresses.json",
@@ -13,10 +14,13 @@
         "test/generated-artifacts/EthBalanceChecker.json",
         "test/generated-artifacts/ExternalFunctions.json",
         "test/generated-artifacts/LibAssetData.json",
+        "test/generated-artifacts/LibDydxBalance.json",
         "test/generated-artifacts/LibOrderTransferSimulation.json",
         "test/generated-artifacts/LibTransactionDecoder.json",
         "test/generated-artifacts/OrderTransferSimulationUtils.json",
-        "test/generated-artifacts/OrderValidationUtils.json"
+        "test/generated-artifacts/OrderValidationUtils.json",
+        "test/generated-artifacts/TestDydx.json",
+        "test/generated-artifacts/TestLibDydxBalance.json"
     ],
     "exclude": ["./deploy/solc/solc_bin"]
 }

contracts/erc1155/CHANGELOG.json

@@ -1,4 +1,58 @@
 [
+    {
+        "timestamp": 1592969527,
+        "version": "2.1.6",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1583220306,
+        "version": "2.1.5",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1582837861,
+        "version": "2.1.4",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1582677073,
+        "version": "2.1.3",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1582623685,
+        "version": "2.1.2",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1581748629,
+        "version": "2.1.1",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
     {
         "version": "2.1.0",
         "changes": [

contracts/erc1155/CHANGELOG.md

@@ -5,6 +5,30 @@ Edit the package's CHANGELOG.json file only.
 
 CHANGELOG
 
+## v2.1.6 - _June 24, 2020_
+
+    * Dependencies updated
+
+## v2.1.5 - _March 3, 2020_
+
+    * Dependencies updated
+
+## v2.1.4 - _February 27, 2020_
+
+    * Dependencies updated
+
+## v2.1.3 - _February 26, 2020_
+
+    * Dependencies updated
+
+## v2.1.2 - _February 25, 2020_
+
+    * Dependencies updated
+
+## v2.1.1 - _February 15, 2020_
+
+    * Dependencies updated
+
 ## v2.1.0 - _February 8, 2020_
 
     * Fix broken tests (#2462)

contracts/erc1155/compiler.json

@@ -3,6 +3,7 @@
     "contractsDir": "./contracts",
     "useDockerisedSolc": false,
     "isOfflineMode": false,
+    "shouldSaveStandardInput": true,
     "compilerSettings": {
         "evmVersion": "istanbul",
         "optimizer": {

contracts/erc1155/package.json

@@ -1,6 +1,6 @@
 {
     "name": "@0x/contracts-erc1155",
-    "version": "2.1.0",
+    "version": "2.1.6",
     "engines": {
         "node": ">=6.12"
     },
@@ -52,15 +52,15 @@
     },
     "homepage": "https://github.com/0xProject/0x-monorepo/contracts/tokens/README.md",
     "devDependencies": {
-        "@0x/abi-gen": "^5.2.0",
-        "@0x/contracts-gen": "^2.0.7",
-        "@0x/contracts-utils": "^4.3.0",
-        "@0x/dev-utils": "^3.2.0",
-        "@0x/sol-compiler": "^4.0.7",
+        "@0x/abi-gen": "^5.3.0",
+        "@0x/contracts-gen": "^2.0.9",
+        "@0x/contracts-utils": "^4.5.0",
+        "@0x/dev-utils": "^3.2.2",
+        "@0x/sol-compiler": "^4.1.0",
         "@0x/ts-doc-gen": "^0.0.22",
         "@0x/tslint-config": "^4.0.0",
-        "@0x/types": "^3.1.2",
-        "@0x/typescript-typings": "^5.0.2",
+        "@0x/types": "^3.1.3",
+        "@0x/typescript-typings": "^5.1.0",
         "@types/lodash": "4.14.104",
         "@types/mocha": "^5.2.7",
         "@types/node": "*",
@@ -68,7 +68,7 @@
         "chai-as-promised": "^7.1.0",
         "chai-bignumber": "^3.0.0",
         "dirty-chai": "^2.0.1",
-        "ethereum-types": "^3.1.0",
+        "ethereum-types": "^3.1.1",
         "make-promises-safe": "^1.1.0",
         "mocha": "^6.2.0",
         "npm-run-all": "^4.1.2",
@@ -80,10 +80,10 @@
         "typescript": "3.0.1"
     },
     "dependencies": {
-        "@0x/base-contract": "^6.2.0",
-        "@0x/contracts-test-utils": "^5.1.4",
-        "@0x/utils": "^5.4.0",
-        "@0x/web3-wrapper": "^7.0.6",
+        "@0x/base-contract": "^6.2.2",
+        "@0x/contracts-test-utils": "^5.3.3",
+        "@0x/utils": "^5.5.0",
+        "@0x/web3-wrapper": "^7.1.0",
         "lodash": "^4.17.11"
     },
     "publishConfig": {

contracts/erc20-bridge-sampler/CHANGELOG.json

@@ -1,10 +1,95 @@
 [
+    {
+        "version": "1.6.0",
+        "changes": [
+            {
+                "note": "Pass in `DevUtils` address as a constructor parameter",
+                "pr": 2531
+            },
+            {
+                "note": "Sample `Curve` for buy amounts",
+                "pr": 2551
+            },
+            {
+                "note": "Added `sampleBuysFromKyberNetwork`",
+                "pr": 2551
+            },
+            {
+                "note": "Use `searchBestRate` in Kyber samples. Return 0 when Uniswap/Eth2Dai reserve",
+                "pr": 2575
+            },
+            {
+                "note": "Add UniswapV2",
+                "pr": 2595
+            },
+            {
+                "note": "Sample from MultiBridge",
+                "pr": 2593
+            }
+        ],
+        "timestamp": 1592969527
+    },
+    {
+        "timestamp": 1583220306,
+        "version": "1.5.1",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "version": "1.5.0",
+        "changes": [
+            {
+                "note": "Add generic liquidity provider sampling",
+                "pr": 2487
+            },
+            {
+                "note": "Use liquidity provider registry in sampler",
+                "pr": 2499
+            }
+        ],
+        "timestamp": 1582837861
+    },
+    {
+        "timestamp": 1582677073,
+        "version": "1.4.2",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1582623685,
+        "version": "1.4.1",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "version": "1.4.0",
+        "changes": [
+            {
+                "note": "Added Curve contract sampling",
+                "pr": 2483
+            }
+        ],
+        "timestamp": 1581748629
+    },
     {
         "version": "1.3.0",
         "changes": [
             {
                 "note": "Catch reverts to `DevUtils` calls",
                 "pr": 2476
+            },
+            {
+                "note": "Remove wrapper functions and introduce `batchCall()`",
+                "pr": 2477
             }
         ],
         "timestamp": 1581204851

contracts/erc20-bridge-sampler/CHANGELOG.md

@@ -5,9 +5,40 @@ Edit the package's CHANGELOG.json file only.
 
 CHANGELOG
 
+## v1.6.0 - _June 24, 2020_
+
+    * Pass in `DevUtils` address as a constructor parameter (#2531)
+    * Sample `Curve` for buy amounts (#2551)
+    * Added `sampleBuysFromKyberNetwork` (#2551)
+    * Use `searchBestRate` in Kyber samples. Return 0 when Uniswap/Eth2Dai reserve (#2575)
+    * Add UniswapV2 (#2595)
+    * Sample from MultiBridge (#2593)
+
+## v1.5.1 - _March 3, 2020_
+
+    * Dependencies updated
+
+## v1.5.0 - _February 27, 2020_
+
+    * Add generic liquidity provider sampling (#2487)
+    * Use liquidity provider registry in sampler (#2499)
+
+## v1.4.2 - _February 26, 2020_
+
+    * Dependencies updated
+
+## v1.4.1 - _February 25, 2020_
+
+    * Dependencies updated
+
+## v1.4.0 - _February 15, 2020_
+
+    * Added Curve contract sampling (#2483)
+
 ## v1.3.0 - _February 8, 2020_
 
     * Catch reverts to `DevUtils` calls (#2476)
+    * Remove wrapper functions and introduce `batchCall()` (#2477)
 
 ## v1.2.1 - _February 6, 2020_
 

contracts/erc20-bridge-sampler/compiler.json

@@ -3,6 +3,7 @@
     "contractsDir": "./contracts",
     "useDockerisedSolc": false,
     "isOfflineMode": false,
+    "shouldSaveStandardInput": true,
     "compilerSettings": {
         "evmVersion": "istanbul",
         "optimizer": {

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

@@ -0,0 +1,38 @@
+pragma solidity ^0.5.9;
+pragma experimental ABIEncoderV2;
+
+
+contract DummyLiquidityProvider
+{
+    /// @dev Quotes the amount of `makerToken` that would be obtained by
+    ///      selling `sellAmount` of `takerToken`.
+    /// @param sellAmount Amount of `takerToken` to sell.
+    /// @return makerTokenAmount Amount of `makerToken` that would be obtained.
+    function getSellQuote(
+        address, /* takerToken */
+        address, /* makerToken */
+        uint256 sellAmount
+    )
+        external
+        view
+        returns (uint256 makerTokenAmount)
+    {
+        makerTokenAmount = sellAmount - 1;
+    }
+
+    /// @dev Quotes the amount of `takerToken` that would need to be sold in
+    ///      order to obtain `buyAmount` of `makerToken`.
+    /// @param buyAmount Amount of `makerToken` to buy.
+    /// @return takerTokenAmount Amount of `takerToken` that would need to be sold.
+    function getBuyQuote(
+        address, /* takerToken */
+        address, /* makerToken */
+        uint256 buyAmount
+    )
+        external
+        view
+        returns (uint256 takerTokenAmount)
+    {
+        takerTokenAmount = buyAmount + 1;
+    }
+}

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

@@ -0,0 +1,44 @@
+pragma solidity ^0.5.9;
+pragma experimental ABIEncoderV2;
+
+
+contract DummyLiquidityProviderRegistry
+{
+    address private constant NULL_ADDRESS = address(0x0);
+
+    mapping (address => mapping (address => address)) internal _gAddressBook;
+
+    /// @dev Sets address of pool for a market given market (xAsset, yAsset).
+    /// @param xToken First asset managed by pool.
+    /// @param yToken Second asset managed by pool.
+    /// @param poolAddress Address of pool.
+    function setLiquidityProviderForMarket(
+        address xToken,
+        address yToken,
+        address poolAddress
+    )
+        external
+    {
+        _gAddressBook[xToken][yToken] = poolAddress;
+        _gAddressBook[yToken][xToken] = poolAddress;
+    }
+
+    /// @dev Returns the address of pool for a market given market (xAsset, yAsset), or reverts if pool does not exist.
+    /// @param xToken First asset managed by pool.
+    /// @param yToken Second asset managed by pool.
+    /// @return Address of pool.
+    function getLiquidityProviderForMarket(
+        address xToken,
+        address yToken
+    )
+        external
+        view
+        returns (address poolAddress)
+    {
+        poolAddress = _gAddressBook[xToken][yToken];
+        require(
+            poolAddress != NULL_ADDRESS,
+            "Registry/MARKET_PAIR_NOT_SET"
+        );
+    }
+}

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

@@ -0,0 +1,87 @@
+/*
+
+  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;
+
+
+// solhint-disable func-name-mixedcase
+interface ICurve {
+
+    /// @dev Sell `sellAmount` of `fromToken` token and receive `toToken` token.
+    ///      This function exists on early versions of Curve (USDC/DAI)
+    /// @param i The token index being sold.
+    /// @param j The token index being bought.
+    /// @param sellAmount The amount of token being bought.
+    /// @param minBuyAmount The minimum buy amount of the token being bought.
+    /// @param deadline The time in seconds when this operation should expire.
+    function exchange_underlying(
+        int128 i,
+        int128 j,
+        uint256 sellAmount,
+        uint256 minBuyAmount,
+        uint256 deadline
+    )
+        external;
+
+    /// @dev Sell `sellAmount` of `fromToken` token and receive `toToken` token.
+    ///      This function exists on later versions of Curve (USDC/DAI/USDT)
+    /// @param i The token index being sold.
+    /// @param j The token index being bought.
+    /// @param sellAmount The amount of token being bought.
+    /// @param minBuyAmount The minimum buy amount of the token being bought.
+    function exchange_underlying(
+        int128 i,
+        int128 j,
+        uint256 sellAmount,
+        uint256 minBuyAmount
+    )
+        external;
+
+    /// @dev Get the amount of `toToken` by selling `sellAmount` of `fromToken`
+    /// @param i The token index being sold.
+    /// @param j The token index being bought.
+    /// @param sellAmount The amount of token being bought.
+    function get_dy_underlying(
+        int128 i,
+        int128 j,
+        uint256 sellAmount
+    )
+        external
+        returns (uint256 dy);
+
+    /// @dev Get the amount of `fromToken` by buying `buyAmount` of `toToken`
+    ///      This function exists on later versions of Curve (USDC/DAI/USDT)
+    /// @param i The token index being sold.
+    /// @param j The token index being bought.
+    /// @param buyAmount The amount of token being bought.
+    function get_dx_underlying(
+        int128 i,
+        int128 j,
+        uint256 buyAmount
+    )
+        external
+        returns (uint256 dx);
+
+    /// @dev Get the underlying token address from the token index
+    /// @param i The token index.
+    function underlying_coins(
+        int128 i
+    )
+        external
+        returns (address tokenAddress);
+}

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

@@ -23,98 +23,19 @@ import "@0x/contracts-exchange-libs/contracts/src/LibOrder.sol";
 
 
 interface IERC20BridgeSampler {
-    struct OrdersAndSample {
-        uint256[] orderFillableAssetAmounts;
-        uint256[][] tokenAmountsBySource;
+
+    struct FakeBuyOptions {
+        uint256 targetSlippageBps;
+        uint256 maxIterations;
     }
 
-    /// @dev Query batches of native orders and sample sell quotes on multiple DEXes at once.
-    /// @param orders Batches of Native orders to query.
-    /// @param orderSignatures Batches of Signatures for each respective order in `orders`.
-    /// @param sources Address of each DEX. Passing in an unsupported DEX will throw.
-    /// @param takerTokenAmounts Batches of Taker token sell amount for each sample.
-    /// @return ordersAndSamples How much taker asset can be filled
-    ///         by each order in `orders`. Maker amounts bought for each source at
-    ///         each taker token amount. First indexed by source index, then sample
-    ///         index.
-    function queryBatchOrdersAndSampleSells(
-        LibOrder.Order[][] calldata orders,
-        bytes[][] calldata orderSignatures,
-        address[] calldata sources,
-        uint256[][] calldata takerTokenAmounts
-    )
+    /// @dev Call multiple public functions on this contract in a single transaction.
+    /// @param callDatas ABI-encoded call data for each function call.
+    /// @return callResults ABI-encoded results data for each call.
+    function batchCall(bytes[] calldata callDatas)
         external
         view
-        returns (
-            OrdersAndSample[] memory ordersAndSamples
-        );
-
-    /// @dev Query batches of native orders and sample buy quotes on multiple DEXes at once.
-    /// @param orders Batches of Native orders to query.
-    /// @param orderSignatures Batches of Signatures for each respective order in `orders`.
-    /// @param sources Address of each DEX. Passing in an unsupported DEX will throw.
-    /// @param makerTokenAmounts Batches of Maker token sell amount for each sample.
-    /// @return ordersAndSamples How much taker asset can be filled
-    ///         by each order in `orders`. Taker amounts sold for each source at
-    ///         each maker token amount. First indexed by source index, then sample
-    ///         index
-    function queryBatchOrdersAndSampleBuys(
-        LibOrder.Order[][] calldata orders,
-        bytes[][] calldata orderSignatures,
-        address[] calldata sources,
-        uint256[][] calldata makerTokenAmounts
-    )
-        external
-        view
-        returns (
-            OrdersAndSample[] memory ordersAndSamples
-        );
-
-    /// @dev Query native orders and sample sell quotes on multiple DEXes at once.
-    /// @param orders Native orders to query.
-    /// @param orderSignatures Signatures for each respective order in `orders`.
-    /// @param sources Address of each DEX. Passing in an unsupported DEX will throw.
-    /// @param takerTokenAmounts Taker token sell amount for each sample.
-    /// @return orderFillableTakerAssetAmounts How much taker asset can be filled
-    ///         by 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,
-        bytes[] calldata orderSignatures,
-        address[] calldata sources,
-        uint256[] calldata takerTokenAmounts
-    )
-        external
-        view
-        returns (
-            uint256[] memory orderFillableTakerAssetAmounts,
-            uint256[][] memory makerTokenAmountsBySource
-        );
-
-    /// @dev Query native orders and sample buy quotes on multiple DEXes at once.
-    /// @param orders Native orders to query.
-    /// @param orderSignatures Signatures for each respective order in `orders`.
-    /// @param sources Address of each DEX. Passing in an unsupported DEX will throw.
-    /// @param makerTokenAmounts Maker token buy amount for each sample.
-    /// @return orderFillableMakerAssetAmounts How much maker asset can be filled
-    ///         by 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,
-        bytes[] calldata orderSignatures,
-        address[] calldata sources,
-        uint256[] calldata makerTokenAmounts
-    )
-        external
-        view
-        returns (
-            uint256[] memory orderFillableMakerAssetAmounts,
-            uint256[][] memory makerTokenAmountsBySource
-        );
+        returns (bytes[] memory callResults);
 
     /// @dev Queries the fillable taker asset amounts of native orders.
     /// @param orders Native orders to query.
@@ -142,39 +63,227 @@ interface IERC20BridgeSampler {
         view
         returns (uint256[] memory orderFillableMakerAssetAmounts);
 
-    /// @dev Sample sell quotes on multiple DEXes at once.
-    /// @param sources Address of each DEX. Passing in an unsupported DEX will throw.
+    /// @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 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,
+    /// @return makerTokenAmounts Maker amounts bought at each taker token
+    ///         amount.
+    function sampleSellsFromKyberNetwork(
         address takerToken,
         address makerToken,
         uint256[] calldata takerTokenAmounts
     )
         external
         view
-        returns (uint256[][] memory makerTokenAmountsBySource);
+        returns (uint256[] memory makerTokenAmounts);
 
-    /// @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.
+    /// @dev Sample buy quotes from Kyber.
     /// @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,
+    /// @param opts `FakeBuyOptions` specifying target slippage and max iterations.
+    /// @return takerTokenAmounts Taker amounts sold at each maker token
+    ///         amount.
+    function sampleBuysFromKyberNetwork(
+        address takerToken,
+        address makerToken,
+        uint256[] calldata makerTokenAmounts,
+        FakeBuyOptions calldata opts
+    )
+        external
+        view
+        returns (uint256[] memory takerTokenAmounts);
+
+    /// @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[] calldata takerTokenAmounts
+    )
+        external
+        view
+        returns (uint256[] memory makerTokenAmounts);
+
+    /// @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[] calldata takerTokenAmounts
+    )
+        external
+        view
+        returns (uint256[] memory makerTokenAmounts);
+
+    /// @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 buy amount for each sample.
+    /// @return takerTokenAmounts Taker amounts sold at each maker token
+    ///         amount.
+    function sampleBuysFromUniswap(
         address takerToken,
         address makerToken,
         uint256[] calldata makerTokenAmounts
     )
         external
         view
-        returns (uint256[][] memory takerTokenAmountsBySource);
+        returns (uint256[] memory takerTokenAmounts);
+
+    /// @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 makerTokenAmounts Maker token buy amount for each sample.
+    /// @return takerTokenAmounts Taker amounts sold at each maker token
+    ///         amount.
+    function sampleBuysFromEth2Dai(
+        address takerToken,
+        address makerToken,
+        uint256[] calldata makerTokenAmounts
+    )
+        external
+        view
+        returns (uint256[] memory takerTokenAmounts);
+
+    /// @dev Sample sell quotes from Curve.
+    /// @param curveAddress Address of the Curve contract.
+    /// @param fromTokenIdx Index of the taker token (what to sell).
+    /// @param toTokenIdx Index 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 sampleSellsFromCurve(
+        address curveAddress,
+        int128 fromTokenIdx,
+        int128 toTokenIdx,
+        uint256[] calldata takerTokenAmounts
+    )
+        external
+        view
+        returns (uint256[] memory makerTokenAmounts);
+
+    /// @dev Sample buy quotes from Curve.
+    /// @param curveAddress Address of the Curve contract.
+    /// @param fromTokenIdx Index of the taker token (what to sell).
+    /// @param toTokenIdx Index of the maker token (what to buy).
+    /// @param makerTokenAmounts Maker token buy amount for each sample.
+    /// @return takerTokenAmounts Taker amounts sold at each maker token
+    ///         amount.
+    function sampleBuysFromCurve(
+        address curveAddress,
+        int128 fromTokenIdx,
+        int128 toTokenIdx,
+        uint256[] calldata makerTokenAmounts
+    )
+        external
+        view
+        returns (uint256[] memory takerTokenAmounts);
+
+    /// @dev Sample sell quotes from an arbitrary on-chain liquidity provider.
+    /// @param registryAddress Address of the liquidity provider registry contract.
+    /// @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 sampleSellsFromLiquidityProviderRegistry(
+        address registryAddress,
+        address takerToken,
+        address makerToken,
+        uint256[] calldata takerTokenAmounts
+    )
+        external
+        view
+        returns (uint256[] memory makerTokenAmounts);
+
+    /// @dev Sample sell quotes from MultiBridge.
+    /// @param multibridge Address of the MultiBridge contract.
+    /// @param takerToken Address of the taker token (what to sell).
+    /// @param intermediateToken The address of the intermediate token to
+    ///        use in an indirect route.
+    /// @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 sampleSellsFromMultiBridge(
+        address multibridge,
+        address takerToken,
+        address intermediateToken,
+        address makerToken,
+        uint256[] calldata takerTokenAmounts
+    )
+        external
+        view
+        returns (uint256[] memory makerTokenAmounts);
+
+    /// @dev Sample buy quotes from an arbitrary on-chain liquidity provider.
+    /// @param registryAddress Address of the liquidity provider registry contract.
+    /// @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.
+    /// @param opts `FakeBuyOptions` specifying target slippage and max iterations.
+    /// @return takerTokenAmounts Taker amounts sold at each maker token
+    ///         amount.
+    function sampleBuysFromLiquidityProviderRegistry(
+        address registryAddress,
+        address takerToken,
+        address makerToken,
+        uint256[] calldata makerTokenAmounts,
+        FakeBuyOptions calldata opts
+
+    )
+        external
+        view
+        returns (uint256[] memory takerTokenAmounts);
+
+    /// @dev Returns the address of a liquidity provider for the given market
+    ///      (takerToken, makerToken), from a registry of liquidity providers.
+    ///      Returns address(0) if no such provider exists in the registry.
+    /// @param takerToken Taker asset managed by liquidity provider.
+    /// @param makerToken Maker asset managed by liquidity provider.
+    /// @return providerAddress Address of the liquidity provider.
+    function getLiquidityProviderFromRegistry(
+        address registryAddress,
+        address takerToken,
+        address makerToken
+    )
+        external
+        view
+        returns (address providerAddress);
+
+    /// @dev Sample sell quotes from UniswapV2.
+    /// @param path Token route.
+    /// @param takerTokenAmounts Taker token sell amount for each sample.
+    /// @return makerTokenAmounts Maker amounts bought at each taker token
+    ///         amount.
+    function sampleSellsFromUniswapV2(
+        address[] calldata path,
+        uint256[] calldata takerTokenAmounts
+    )
+        external
+        view
+        returns (uint256[] memory makerTokenAmounts);
+
+    /// @dev Sample buy quotes from UniswapV2.
+    /// @param path Token route.
+    /// @param makerTokenAmounts Maker token buy amount for each sample.
+    /// @return takerTokenAmounts Taker amounts sold at each maker token
+    ///         amount.
+    function sampleBuysFromUniswapV2(
+        address[] calldata path,
+        uint256[] calldata makerTokenAmounts
+    )
+        external
+        view
+        returns (uint256[] memory takerTokenAmounts);
 }

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

@@ -21,12 +21,13 @@ pragma solidity ^0.5.9;
 
 interface IKyberNetwork {
 
-    function getExpectedRate(
+    function searchBestRate(
         address fromToken,
         address toToken,
-        uint256 fromAmount
+        uint256 fromAmount,
+        bool usePermissionless
     )
         external
         view
-        returns (uint256 expectedRate, uint256 slippageRate);
+        returns (address reserve, uint256 expectedRate);
 }

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

@@ -0,0 +1,34 @@
+/*
+
+  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 {
+
+    function kyberNetworkContract() external view returns (address);
+
+    function getExpectedRate(
+        address fromToken,
+        address toToken,
+        uint256 fromAmount
+    )
+        external
+        view
+        returns (uint256 expectedRate, uint256 slippageRate);
+}

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

@@ -0,0 +1,70 @@
+/*
+
+  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 ILiquidityProvider {
+
+    /// @dev Transfers `amount` of the ERC20 `tokenAddress` from `from` to `to`.
+    /// @param tokenAddress The address of the ERC20 token to transfer.
+    /// @param from Address to transfer asset from.
+    /// @param to Address to transfer asset to.
+    /// @param amount Amount of asset to transfer.
+    /// @param bridgeData Arbitrary asset data needed by the bridge contract.
+    /// @return success The magic bytes `0xdc1600f3` if successful.
+    function bridgeTransferFrom(
+        address tokenAddress,
+        address from,
+        address to,
+        uint256 amount,
+        bytes calldata bridgeData
+    )
+        external
+        returns (bytes4 success);
+
+    /// @dev Quotes the amount of `makerToken` that would be obtained by
+    ///      selling `sellAmount` of `takerToken`.
+    /// @param takerToken Address of the taker token (what to sell).
+    /// @param makerToken Address of the maker token (what to buy).
+    /// @param sellAmount Amount of `takerToken` to sell.
+    /// @return makerTokenAmount Amount of `makerToken` that would be obtained.
+    function getSellQuote(
+        address takerToken,
+        address makerToken,
+        uint256 sellAmount
+    )
+        external
+        view
+        returns (uint256 makerTokenAmount);
+
+    /// @dev Quotes the amount of `takerToken` that would need to be sold in
+    ///      order to obtain `buyAmount` of `makerToken`.
+    /// @param takerToken Address of the taker token (what to sell).
+    /// @param makerToken Address of the maker token (what to buy).
+    /// @param buyAmount Amount of `makerToken` to buy.
+    /// @return takerTokenAmount Amount of `takerToken` that would need to be sold.
+    function getBuyQuote(
+        address takerToken,
+        address makerToken,
+        uint256 buyAmount
+    )
+        external
+        view
+        returns (uint256 takerTokenAmount);
+}

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

@@ -0,0 +1,36 @@
+/*
+
+  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 ILiquidityProviderRegistry {
+
+    /// @dev Returns the address of a liquidity provider for the given market
+    ///      (takerToken, makerToken), reverting if the pool does not exist.
+    /// @param takerToken Taker asset managed by liquidity provider.
+    /// @param makerToken Maker asset managed by liquidity provider.
+    /// @return Address of the liquidity provider.
+    function getLiquidityProviderForMarket(
+        address takerToken,
+        address makerToken
+    )
+        external
+        view
+        returns (address providerAddress);
+}

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

@@ -0,0 +1,58 @@
+/*
+
+  Copyright 2020 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 IMultiBridge {
+
+    /// @dev Transfers `amount` of the ERC20 `tokenAddress` from `from` to `to`.
+    /// @param tokenAddress The address of the ERC20 token to transfer.
+    /// @param from Address to transfer asset from.
+    /// @param to Address to transfer asset to.
+    /// @param amount Amount of asset to transfer.
+    /// @param bridgeData Arbitrary asset data needed by the bridge contract.
+    /// @return success The magic bytes `0xdc1600f3` if successful.
+    function bridgeTransferFrom(
+        address tokenAddress,
+        address from,
+        address to,
+        uint256 amount,
+        bytes calldata bridgeData
+    )
+        external
+        returns (bytes4 success);
+
+    /// @dev Quotes the amount of `makerToken` that would be obtained by
+    ///      selling `sellAmount` of `takerToken`.
+    /// @param takerToken Address of the taker token (what to sell).
+    /// @param intermediateToken The address of the intermediate token to
+    ///        use in an indirect route.
+    /// @param makerToken Address of the maker token (what to buy).
+    /// @param sellAmount Amount of `takerToken` to sell.
+    /// @return makerTokenAmount Amount of `makerToken` that would be obtained.
+    function getSellQuote(
+        address takerToken,
+        address intermediateToken,
+        address makerToken,
+        uint256 sellAmount
+    )
+        external
+        view
+        returns (uint256 makerTokenAmount);
+}

contracts/erc20-bridge-sampler/contracts/src/IUniswapV2Router01.sol

@@ -0,0 +1,33 @@
+/*
+
+  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 IUniswapV2Router01 {
+
+    function getAmountsOut(uint256 amountIn, address[] calldata path)
+        external
+        view
+        returns (uint256[] memory amounts);
+
+    function getAmountsIn(uint256 amountOut, address[] calldata path)
+        external
+        view
+        returns (uint256[] memory amounts);
+}

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

@@ -24,7 +24,8 @@ import "@0x/contracts-exchange-libs/contracts/src/LibOrder.sol";
 import "../src/ERC20BridgeSampler.sol";
 import "../src/IEth2Dai.sol";
 import "../src/IDevUtils.sol";
-import "../src/IKyberNetwork.sol";
+import "../src/IKyberNetworkProxy.sol";
+import "../src/IUniswapV2Router01.sol";
 
 
 library LibDeterministicQuotes {
@@ -194,6 +195,55 @@ contract TestERC20BridgeSamplerUniswapExchange is
 }
 
 
+contract TestERC20BridgeSamplerUniswapV2Router01 is
+    IUniswapV2Router01,
+    DeploymentConstants,
+    FailTrigger
+{
+    bytes32 constant private SALT = 0xadc7fcb33c735913b8635927e66896b356a53a912ab2ceff929e60a04b53b3c1;
+
+    // Deterministic `IUniswapV2Router01.getAmountsOut()`.
+    function getAmountsOut(uint256 amountIn, address[] calldata path)
+        external
+        view
+        returns (uint256[] memory amounts)
+    {
+        require(path.length >= 2, "PATH_TOO_SHORT");
+        _revertIfShouldFail();
+        amounts = new uint256[](path.length);
+        amounts[0] = amountIn;
+        for (uint256 i = 0; i < path.length - 1; ++i) {
+            amounts[i + 1] = LibDeterministicQuotes.getDeterministicSellQuote(
+                SALT,
+                path[i],
+                path[i + 1],
+                amounts[i]
+            );
+        }
+    }
+
+    // Deterministic `IUniswapV2Router01.getAmountsInt()`.
+    function getAmountsIn(uint256 amountOut, address[] calldata path)
+        external
+        view
+        returns (uint256[] memory amounts)
+    {
+        require(path.length >= 2, "PATH_TOO_SHORT");
+        _revertIfShouldFail();
+        amounts = new uint256[](path.length);
+        amounts[path.length - 1] = amountOut;
+        for (uint256 i = path.length - 1; i > 0; --i) {
+            amounts[i - 1] = LibDeterministicQuotes.getDeterministicBuyQuote(
+                SALT,
+                path[i - 1],
+                path[i],
+                amounts[i]
+            );
+        }
+    }
+}
+
+
 contract TestERC20BridgeSamplerKyberNetwork is
     IKyberNetwork,
     DeploymentConstants,
@@ -202,7 +252,30 @@ contract TestERC20BridgeSamplerKyberNetwork is
     bytes32 constant private SALT = 0x0ff3ca9d46195c39f9a12afb74207b4970349fb3cfb1e459bbf170298d326bc7;
     address constant public ETH_ADDRESS = 0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE;
 
-    // Deterministic `IKyberNetwork.getExpectedRate()`.
+    function kyberNetworkContract()
+        external
+        view
+        returns (address)
+    {
+        return address(this);
+    }
+
+    // IKyberNetwork not exposed via IKyberNetworkProxy
+    function searchBestRate(
+        address fromToken,
+        address toToken,
+        uint256 fromAmount,
+        bool  // usePermissionless
+    )
+        external
+        view
+        returns (address reserve, uint256 expectedRate)
+    {
+        (expectedRate, ) = this.getExpectedRate(fromToken, toToken, fromAmount);
+        return (address(this), expectedRate);
+    }
+
+    // Deterministic `IKyberNetworkProxy.getExpectedRate()`.
     function getExpectedRate(
         address fromToken,
         address toToken,
@@ -302,13 +375,15 @@ contract TestERC20BridgeSampler is
     FailTrigger
 {
     TestERC20BridgeSamplerUniswapExchangeFactory public uniswap;
+    TestERC20BridgeSamplerUniswapV2Router01 public uniswapV2Router;
     TestERC20BridgeSamplerEth2Dai public eth2Dai;
     TestERC20BridgeSamplerKyberNetwork public kyber;
 
     uint8 private constant MAX_ORDER_STATUS = uint8(LibOrder.OrderStatus.CANCELLED) + 1;
 
-    constructor() public {
+    constructor() public ERC20BridgeSampler(address(this)) {
         uniswap = new TestERC20BridgeSamplerUniswapExchangeFactory();
+        uniswapV2Router = new TestERC20BridgeSamplerUniswapV2Router01();
         eth2Dai = new TestERC20BridgeSamplerEth2Dai();
         kyber = new TestERC20BridgeSamplerKyberNetwork();
     }
@@ -327,7 +402,7 @@ contract TestERC20BridgeSampler is
         bytes memory
     )
         public
-        view
+        pure
         returns (
             LibOrder.OrderInfo memory orderInfo,
             uint256 fillableTakerAssetAmount,
@@ -358,15 +433,6 @@ contract TestERC20BridgeSampler is
         return LibDeterministicQuotes.getDeterministicTokenDecimals(tokenAddress);
     }
 
-    // Overriden to point to a this contract.
-    function _getDevUtilsAddress()
-        internal
-        view
-        returns (address devUtilAddress)
-    {
-        return address(this);
-    }
-
     // Overriden to point to a custom contract.
     function _getEth2DaiAddress()
         internal
@@ -385,6 +451,15 @@ contract TestERC20BridgeSampler is
         return address(uniswap);
     }
 
+    // Overriden to point to a custom contract.
+    function _getUniswapV2Router01Address()
+        internal
+        view
+        returns (address uniswapV2RouterAddress)
+    {
+        return address(uniswapV2Router);
+    }
+
     // Overriden to point to a custom contract.
     function _getKyberNetworkProxyAddress()
         internal

contracts/erc20-bridge-sampler/package.json

@@ -1,6 +1,6 @@
 {
     "name": "@0x/contracts-erc20-bridge-sampler",
-    "version": "1.3.0",
+    "version": "1.6.0",
     "engines": {
         "node": ">=6.12"
     },
@@ -36,9 +36,9 @@
         "compile:truffle": "truffle compile"
     },
     "config": {
-        "publicInterfaceContracts": "ERC20BridgeSampler,IERC20BridgeSampler",
+        "publicInterfaceContracts": "ERC20BridgeSampler,IERC20BridgeSampler,ILiquidityProvider,ILiquidityProviderRegistry,DummyLiquidityProviderRegistry,DummyLiquidityProvider",
         "abis:comment": "This list is auto-generated by contracts-gen. Don't edit manually.",
-        "abis": "./test/generated-artifacts/@(ERC20BridgeSampler|IDevUtils|IERC20BridgeSampler|IEth2Dai|IKyberNetwork|IUniswapExchangeQuotes|TestERC20BridgeSampler).json"
+        "abis": "./test/generated-artifacts/@(DummyLiquidityProvider|DummyLiquidityProviderRegistry|ERC20BridgeSampler|ICurve|IDevUtils|IERC20BridgeSampler|IEth2Dai|IKyberNetwork|IKyberNetworkProxy|ILiquidityProvider|ILiquidityProviderRegistry|IMultiBridge|IUniswapExchangeQuotes|IUniswapV2Router01|TestERC20BridgeSampler).json"
     },
     "repository": {
         "type": "git",
@@ -50,18 +50,18 @@
     },
     "homepage": "https://github.com/0xProject/0x-monorepo/contracts/protocol/README.md",
     "devDependencies": {
-        "@0x/abi-gen": "^5.2.0",
-        "@0x/contracts-asset-proxy": "^3.2.0",
-        "@0x/contracts-erc20": "^3.1.0",
-        "@0x/contracts-exchange": "^3.2.0",
-        "@0x/contracts-exchange-libs": "^4.3.0",
-        "@0x/contracts-gen": "^2.0.7",
-        "@0x/contracts-test-utils": "^5.1.4",
-        "@0x/contracts-utils": "^4.3.0",
-        "@0x/dev-utils": "^3.2.0",
-        "@0x/sol-compiler": "^4.0.7",
+        "@0x/abi-gen": "^5.3.0",
+        "@0x/contracts-asset-proxy": "^3.3.0",
+        "@0x/contracts-erc20": "^3.2.0",
+        "@0x/contracts-exchange": "^3.2.6",
+        "@0x/contracts-exchange-libs": "^4.3.6",
+        "@0x/contracts-gen": "^2.0.9",
+        "@0x/contracts-test-utils": "^5.3.3",
+        "@0x/contracts-utils": "^4.5.0",
+        "@0x/dev-utils": "^3.2.2",
+        "@0x/sol-compiler": "^4.1.0",
         "@0x/tslint-config": "^4.0.0",
-        "@0x/web3-wrapper": "^7.0.6",
+        "@0x/web3-wrapper": "^7.1.0",
         "@types/lodash": "4.14.104",
         "@types/mocha": "^5.2.7",
         "@types/node": "*",
@@ -79,11 +79,11 @@
         "typescript": "3.0.1"
     },
     "dependencies": {
-        "@0x/base-contract": "^6.2.0",
-        "@0x/types": "^3.1.2",
-        "@0x/typescript-typings": "^5.0.2",
-        "@0x/utils": "^5.4.0",
-        "ethereum-types": "^3.1.0",
+        "@0x/base-contract": "^6.2.2",
+        "@0x/types": "^3.1.3",
+        "@0x/typescript-typings": "^5.1.0",
+        "@0x/utils": "^5.5.0",
+        "ethereum-types": "^3.1.1",
         "lodash": "^4.17.11"
     },
     "publishConfig": {

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

@@ -5,9 +5,17 @@
  */
 import { ContractArtifact } from 'ethereum-types';
 
+import * as DummyLiquidityProvider from '../generated-artifacts/DummyLiquidityProvider.json';
+import * as DummyLiquidityProviderRegistry from '../generated-artifacts/DummyLiquidityProviderRegistry.json';
 import * as ERC20BridgeSampler from '../generated-artifacts/ERC20BridgeSampler.json';
 import * as IERC20BridgeSampler from '../generated-artifacts/IERC20BridgeSampler.json';
+import * as ILiquidityProvider from '../generated-artifacts/ILiquidityProvider.json';
+import * as ILiquidityProviderRegistry from '../generated-artifacts/ILiquidityProviderRegistry.json';
 export const artifacts = {
     ERC20BridgeSampler: ERC20BridgeSampler as ContractArtifact,
     IERC20BridgeSampler: IERC20BridgeSampler as ContractArtifact,
+    ILiquidityProvider: ILiquidityProvider as ContractArtifact,
+    ILiquidityProviderRegistry: ILiquidityProviderRegistry as ContractArtifact,
+    DummyLiquidityProviderRegistry: DummyLiquidityProviderRegistry as ContractArtifact,
+    DummyLiquidityProvider: DummyLiquidityProvider as ContractArtifact,
 };

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

@@ -3,5 +3,9 @@
  * Warning: This file is auto-generated by contracts-gen. Don't edit manually.
  * -----------------------------------------------------------------------------
  */
+export * from '../generated-wrappers/dummy_liquidity_provider';
+export * from '../generated-wrappers/dummy_liquidity_provider_registry';
 export * from '../generated-wrappers/erc20_bridge_sampler';
 export * from '../generated-wrappers/i_erc20_bridge_sampler';
+export * from '../generated-wrappers/i_liquidity_provider';
+export * from '../generated-wrappers/i_liquidity_provider_registry';

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

@@ -5,19 +5,35 @@
  */
 import { ContractArtifact } from 'ethereum-types';
 
+import * as DummyLiquidityProvider from '../test/generated-artifacts/DummyLiquidityProvider.json';
+import * as DummyLiquidityProviderRegistry from '../test/generated-artifacts/DummyLiquidityProviderRegistry.json';
 import * as ERC20BridgeSampler from '../test/generated-artifacts/ERC20BridgeSampler.json';
+import * as ICurve from '../test/generated-artifacts/ICurve.json';
 import * as IDevUtils from '../test/generated-artifacts/IDevUtils.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 IKyberNetworkProxy from '../test/generated-artifacts/IKyberNetworkProxy.json';
+import * as ILiquidityProvider from '../test/generated-artifacts/ILiquidityProvider.json';
+import * as ILiquidityProviderRegistry from '../test/generated-artifacts/ILiquidityProviderRegistry.json';
+import * as IMultiBridge from '../test/generated-artifacts/IMultiBridge.json';
 import * as IUniswapExchangeQuotes from '../test/generated-artifacts/IUniswapExchangeQuotes.json';
+import * as IUniswapV2Router01 from '../test/generated-artifacts/IUniswapV2Router01.json';
 import * as TestERC20BridgeSampler from '../test/generated-artifacts/TestERC20BridgeSampler.json';
 export const artifacts = {
+    DummyLiquidityProvider: DummyLiquidityProvider as ContractArtifact,
+    DummyLiquidityProviderRegistry: DummyLiquidityProviderRegistry as ContractArtifact,
     ERC20BridgeSampler: ERC20BridgeSampler as ContractArtifact,
+    ICurve: ICurve as ContractArtifact,
     IDevUtils: IDevUtils as ContractArtifact,
     IERC20BridgeSampler: IERC20BridgeSampler as ContractArtifact,
     IEth2Dai: IEth2Dai as ContractArtifact,
     IKyberNetwork: IKyberNetwork as ContractArtifact,
+    IKyberNetworkProxy: IKyberNetworkProxy as ContractArtifact,
+    ILiquidityProvider: ILiquidityProvider as ContractArtifact,
+    ILiquidityProviderRegistry: ILiquidityProviderRegistry as ContractArtifact,
+    IMultiBridge: IMultiBridge as ContractArtifact,
     IUniswapExchangeQuotes: IUniswapExchangeQuotes as ContractArtifact,
+    IUniswapV2Router01: IUniswapV2Router01 as ContractArtifact,
     TestERC20BridgeSampler: TestERC20BridgeSampler as ContractArtifact,
 };

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

@@ -11,7 +11,11 @@ import { BigNumber, hexUtils } from '@0x/utils';
 import * as _ from 'lodash';
 
 import { artifacts } from './artifacts';
-import { TestERC20BridgeSamplerContract } from './wrappers';
+import {
+    DummyLiquidityProviderContract,
+    DummyLiquidityProviderRegistryContract,
+    TestERC20BridgeSamplerContract,
+} from './wrappers';
 
 blockchainTests('erc20-bridge-sampler', env => {
     let testContract: TestERC20BridgeSamplerContract;
@@ -24,23 +28,15 @@ blockchainTests('erc20-bridge-sampler', env => {
     const KYBER_SALT = '0x0ff3ca9d46195c39f9a12afb74207b4970349fb3cfb1e459bbf170298d326bc7';
     const ETH2DAI_SALT = '0xb713b61bb9bb2958a0f5d1534b21e94fc68c4c0c034b0902ed844f2f6cd1b4f7';
     const UNISWAP_BASE_SALT = '0x1d6a6a0506b0b4a554b907a4c29d9f4674e461989d9c1921feb17b26716385ab';
+    const UNISWAP_V2_SALT = '0xadc7fcb33c735913b8635927e66896b356a53a912ab2ceff929e60a04b53b3c1';
     const ERC20_PROXY_ID = '0xf47261b0';
-    const INVALID_ASSET_PROXY_ASSET_DATA = hexUtils.concat('0xf47261b1', hexUtils.leftPad(randomAddress()));
-    const INVALID_ASSET_DATA = hexUtils.random(37);
-    const SELL_SOURCES = ['Eth2Dai', 'Kyber', 'Uniswap'];
-    const BUY_SOURCES = ['Eth2Dai', 'Uniswap'];
-    const SOURCE_IDS: { [source: string]: string } = {
-        Uniswap: '0xc0a47dfe034b400b47bdad5fecda2621de6c4d95',
-        Eth2Dai: '0x39755357759ce0d7f32dc8dc45414cca409ae24e',
-        Kyber: '0x818e6fecd516ecc3849daf6845e3ec868087b755',
-    };
-    const EMPTY_ORDERS_ERROR = 'ERC20BridgeSampler/EMPTY_ORDERS';
-    const UNSUPPORTED_ASSET_PROXY_ERROR = 'ERC20BridgeSampler/UNSUPPORTED_ASSET_PROXY';
-    const INVALID_ASSET_DATA_ERROR = 'ERC20BridgeSampler/INVALID_ASSET_DATA';
-    const UNSUPPORTED_SOURCE_ERROR = 'ERC20BridgeSampler/UNSUPPORTED_SOURCE';
     const INVALID_TOKEN_PAIR_ERROR = 'ERC20BridgeSampler/INVALID_TOKEN_PAIR';
     const MAKER_TOKEN = randomAddress();
     const TAKER_TOKEN = randomAddress();
+    const FAKE_BUY_OPTS = {
+        targetSlippageBps: new BigNumber(5),
+        maxIterations: new BigNumber(5),
+    };
 
     before(async () => {
         testContract = await TestERC20BridgeSamplerContract.deployFrom0xArtifactAsync(
@@ -178,8 +174,15 @@ blockchainTests('erc20-bridge-sampler', env => {
         for (const source of sources) {
             const sampleOutputs = [];
             for (const amount of sampleAmounts) {
-                if (source === 'Eth2Dai') {
-                    sampleOutputs.push(getDeterministicBuyQuote(ETH2DAI_SALT, sellToken, buyToken, amount));
+                if (source === 'Kyber' || source === 'Eth2Dai') {
+                    sampleOutputs.push(
+                        getDeterministicBuyQuote(
+                            source === 'Kyber' ? KYBER_SALT : ETH2DAI_SALT,
+                            sellToken,
+                            buyToken,
+                            amount,
+                        ),
+                    );
                 } else if (source === 'Uniswap') {
                     sampleOutputs.push(getDeterministicUniswapBuyQuote(sellToken, buyToken, amount));
                 }
@@ -189,8 +192,24 @@ blockchainTests('erc20-bridge-sampler', env => {
         return quotes;
     }
 
+    function getDeterministicUniswapV2SellQuote(path: string[], sellAmount: BigNumber): BigNumber {
+        let bought = sellAmount;
+        for (let i = 0; i < path.length - 1; ++i) {
+            bought = getDeterministicSellQuote(UNISWAP_V2_SALT, path[i], path[i + 1], bought);
+        }
+        return bought;
+    }
+
+    function getDeterministicUniswapV2BuyQuote(path: string[], buyAmount: BigNumber): BigNumber {
+        let sold = buyAmount;
+        for (let i = path.length - 1; i > 0; --i) {
+            sold = getDeterministicBuyQuote(UNISWAP_V2_SALT, path[i - 1], path[i], sold);
+        }
+        return sold;
+    }
+
     function getDeterministicFillableTakerAssetAmount(order: Order): BigNumber {
-        const hash = getPackedHash(hexUtils.toHex(order.salt, 32));
+        const hash = getPackedHash(hexUtils.leftPad(order.salt));
         const orderStatus = new BigNumber(hash).mod(100).toNumber() > 90 ? 5 : 3;
         const isValidSignature = !!new BigNumber(hash).mod(2).toNumber();
         if (orderStatus !== 3 || !isValidSignature) {
@@ -213,7 +232,7 @@ blockchainTests('erc20-bridge-sampler', env => {
 
     function getSampleAmounts(tokenAddress: string, count?: number): BigNumber[] {
         const tokenDecimals = getDeterministicTokenDecimals(tokenAddress);
-        const _upperLimit = getRandomPortion(getRandomInteger(1, 1000).times(10 ** tokenDecimals));
+        const _upperLimit = getRandomPortion(getRandomInteger(1000, 50000).times(10 ** tokenDecimals));
         const _count = count || _.random(1, 16);
         const d = _upperLimit.div(_count);
         return _.times(_count, i => d.times((i + 1) / _count).integerValue());
@@ -324,329 +343,6 @@ blockchainTests('erc20-bridge-sampler', env => {
         });
     });
 
-    describe('queryOrdersAndSampleSells()', () => {
-        const ORDERS = createOrders(MAKER_TOKEN, TAKER_TOKEN);
-        const SIGNATURES: string[] = _.times(ORDERS.length, i => hexUtils.random());
-
-        before(async () => {
-            await testContract.createTokenExchanges([MAKER_TOKEN, TAKER_TOKEN]).awaitTransactionSuccessAsync();
-        });
-
-        it('returns expected fillable amounts for each order', async () => {
-            const takerTokenAmounts = getSampleAmounts(TAKER_TOKEN);
-            const expectedFillableAmounts = ORDERS.map(getDeterministicFillableTakerAssetAmount);
-            const [orderInfos] = await testContract
-                .queryOrdersAndSampleSells(ORDERS, SIGNATURES, SELL_SOURCES.map(n => SOURCE_IDS[n]), takerTokenAmounts)
-                .callAsync();
-            expect(orderInfos).to.deep.eq(expectedFillableAmounts);
-        });
-
-        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(ORDERS, SIGNATURES, SELL_SOURCES.map(n => SOURCE_IDS[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 => SOURCE_IDS[n]), getSampleAmounts(TAKER_TOKEN))
-                .callAsync();
-            return expect(tx).to.revertWith(EMPTY_ORDERS_ERROR);
-        });
-
-        it('throws with an unsupported source', async () => {
-            const tx = testContract
-                .queryOrdersAndSampleSells(
-                    ORDERS,
-                    SIGNATURES,
-                    [...SELL_SOURCES.map(n => SOURCE_IDS[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(
-                    ORDERS.map(o => ({
-                        ...o,
-                        makerAssetData: INVALID_ASSET_PROXY_ASSET_DATA,
-                    })),
-                    SIGNATURES,
-                    SELL_SOURCES.map(n => SOURCE_IDS[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(
-                    ORDERS.map(o => ({
-                        ...o,
-                        takerAssetData: INVALID_ASSET_PROXY_ASSET_DATA,
-                    })),
-                    SIGNATURES,
-                    SELL_SOURCES.map(n => SOURCE_IDS[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(
-                    ORDERS.map(o => ({
-                        ...o,
-                        makerAssetData: INVALID_ASSET_DATA,
-                    })),
-                    SIGNATURES,
-                    SELL_SOURCES.map(n => SOURCE_IDS[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(
-                    ORDERS.map(o => ({
-                        ...o,
-                        takerAssetData: INVALID_ASSET_DATA,
-                    })),
-                    SIGNATURES,
-                    SELL_SOURCES.map(n => SOURCE_IDS[n]),
-                    getSampleAmounts(TAKER_TOKEN),
-                )
-                .callAsync();
-            return expect(tx).to.revertWith(INVALID_ASSET_DATA_ERROR);
-        });
-    });
-
-    describe('queryOrdersAndSampleBuys()', () => {
-        const ORDERS = createOrders(MAKER_TOKEN, TAKER_TOKEN);
-        const SIGNATURES: string[] = _.times(ORDERS.length, i => hexUtils.random());
-
-        before(async () => {
-            await testContract.createTokenExchanges([MAKER_TOKEN, TAKER_TOKEN]).awaitTransactionSuccessAsync();
-        });
-
-        it('returns expected fillable amounts for each order', async () => {
-            const takerTokenAmounts = getSampleAmounts(MAKER_TOKEN);
-            const expectedFillableAmounts = ORDERS.map(getDeterministicFillableMakerAssetAmount);
-            const [orderInfos] = await testContract
-                .queryOrdersAndSampleBuys(ORDERS, SIGNATURES, BUY_SOURCES.map(n => SOURCE_IDS[n]), takerTokenAmounts)
-                .callAsync();
-            expect(orderInfos).to.deep.eq(expectedFillableAmounts);
-        });
-
-        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(ORDERS, SIGNATURES, BUY_SOURCES.map(n => SOURCE_IDS[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 => SOURCE_IDS[n]), getSampleAmounts(MAKER_TOKEN))
-                .callAsync();
-            return expect(tx).to.revertWith(EMPTY_ORDERS_ERROR);
-        });
-
-        it('throws with an unsupported source', async () => {
-            const tx = testContract
-                .queryOrdersAndSampleBuys(
-                    ORDERS,
-                    SIGNATURES,
-                    [...BUY_SOURCES.map(n => SOURCE_IDS[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(
-                    ORDERS,
-                    SIGNATURES,
-                    sources.map(n => SOURCE_IDS[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(
-                    ORDERS.map(o => ({
-                        ...o,
-                        makerAssetData: INVALID_ASSET_PROXY_ASSET_DATA,
-                    })),
-                    SIGNATURES,
-                    BUY_SOURCES.map(n => SOURCE_IDS[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(
-                    ORDERS.map(o => ({
-                        ...o,
-                        takerAssetData: INVALID_ASSET_PROXY_ASSET_DATA,
-                    })),
-                    SIGNATURES,
-                    BUY_SOURCES.map(n => SOURCE_IDS[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(
-                    ORDERS.map(o => ({
-                        ...o,
-                        makerAssetData: INVALID_ASSET_DATA,
-                    })),
-                    SIGNATURES,
-                    BUY_SOURCES.map(n => SOURCE_IDS[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(
-                    ORDERS.map(o => ({
-                        ...o,
-                        takerAssetData: INVALID_ASSET_DATA,
-                    })),
-                    SIGNATURES,
-                    BUY_SOURCES.map(n => SOURCE_IDS[n]),
-                    getSampleAmounts(MAKER_TOKEN),
-                )
-                .callAsync();
-            return expect(tx).to.revertWith(INVALID_ASSET_DATA_ERROR);
-        });
-    });
-
-    describe('sampleSells()', () => {
-        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 => SOURCE_IDS[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 => SOURCE_IDS[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 => SOURCE_IDS[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 => SOURCE_IDS[n]), randomAddress()],
-                    TAKER_TOKEN,
-                    MAKER_TOKEN,
-                    getSampleAmounts(TAKER_TOKEN),
-                )
-                .callAsync();
-            return expect(tx).to.revertWith(UNSUPPORTED_SOURCE_ERROR);
-        });
-    });
-
-    describe('sampleBuys()', () => {
-        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 => SOURCE_IDS[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 => SOURCE_IDS[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 => SOURCE_IDS[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 => SOURCE_IDS[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 => SOURCE_IDS[n]), TAKER_TOKEN, MAKER_TOKEN, getSampleAmounts(MAKER_TOKEN))
-                .callAsync();
-            return expect(tx).to.revertWith(UNSUPPORTED_SOURCE_ERROR);
-        });
-    });
-
     blockchainTests.resets('sampleSellsFromKyberNetwork()', () => {
         before(async () => {
             await testContract.createTokenExchanges([MAKER_TOKEN, TAKER_TOKEN]).awaitTransactionSuccessAsync();
@@ -662,9 +358,10 @@ blockchainTests('erc20-bridge-sampler', env => {
             expect(quotes).to.deep.eq([]);
         });
 
-        it('can quote token - token', async () => {
+        it('can quote token -> token', async () => {
             const sampleAmounts = getSampleAmounts(TAKER_TOKEN);
-            const [expectedQuotes] = getDeterministicSellQuotes(TAKER_TOKEN, MAKER_TOKEN, ['Kyber'], sampleAmounts);
+            const [takerToEthQuotes] = getDeterministicSellQuotes(TAKER_TOKEN, WETH_ADDRESS, ['Kyber'], sampleAmounts);
+            const [expectedQuotes] = getDeterministicSellQuotes(WETH_ADDRESS, MAKER_TOKEN, ['Kyber'], takerToEthQuotes);
             const quotes = await testContract
                 .sampleSellsFromKyberNetwork(TAKER_TOKEN, MAKER_TOKEN, sampleAmounts)
                 .callAsync();
@@ -720,6 +417,109 @@ blockchainTests('erc20-bridge-sampler', env => {
         });
     });
 
+    blockchainTests.resets('sampleBuysFromKyberNetwork()', () => {
+        const ACCEPTABLE_SLIPPAGE = 0.0005;
+        before(async () => {
+            await testContract.createTokenExchanges([MAKER_TOKEN, TAKER_TOKEN]).awaitTransactionSuccessAsync();
+        });
+
+        it('throws if tokens are the same', async () => {
+            const tx = testContract.sampleBuysFromKyberNetwork(MAKER_TOKEN, MAKER_TOKEN, [], FAKE_BUY_OPTS).callAsync();
+            return expect(tx).to.revertWith(INVALID_TOKEN_PAIR_ERROR);
+        });
+
+        it('can return no quotes', async () => {
+            const quotes = await testContract
+                .sampleBuysFromKyberNetwork(TAKER_TOKEN, MAKER_TOKEN, [], FAKE_BUY_OPTS)
+                .callAsync();
+            expect(quotes).to.deep.eq([]);
+        });
+        const expectQuotesWithinRange = (
+            quotes: BigNumber[],
+            expectedQuotes: BigNumber[],
+            maxSlippage: BigNumber | number,
+        ) => {
+            quotes.forEach((_q, i) => {
+                // If we're within 1 base unit of a low decimal token
+                // then that's as good as we're going to get (and slippage is "high")
+                if (
+                    expectedQuotes[i].isZero() ||
+                    BigNumber.max(expectedQuotes[i], quotes[i])
+                        .minus(BigNumber.min(expectedQuotes[i], quotes[i]))
+                        .eq(1)
+                ) {
+                    return;
+                }
+                const slippage = quotes[i]
+                    .dividedBy(expectedQuotes[i])
+                    .minus(1)
+                    .decimalPlaces(4);
+                expect(slippage, `quote[${i}]: ${slippage} ${quotes[i]} ${expectedQuotes[i]}`).to.be.bignumber.gte(0);
+                expect(slippage, `quote[${i}] ${slippage} ${quotes[i]} ${expectedQuotes[i]}`).to.be.bignumber.lte(
+                    new BigNumber(maxSlippage),
+                );
+            });
+        };
+
+        it('can quote token -> token', async () => {
+            const sampleAmounts = getSampleAmounts(TAKER_TOKEN);
+            const [ethToMakerQuotes] = getDeterministicBuyQuotes(WETH_ADDRESS, MAKER_TOKEN, ['Kyber'], sampleAmounts);
+            const [expectedQuotes] = getDeterministicBuyQuotes(TAKER_TOKEN, WETH_ADDRESS, ['Kyber'], ethToMakerQuotes);
+            const quotes = await testContract
+                .sampleBuysFromKyberNetwork(TAKER_TOKEN, MAKER_TOKEN, sampleAmounts, FAKE_BUY_OPTS)
+                .callAsync();
+            expectQuotesWithinRange(quotes, expectedQuotes, ACCEPTABLE_SLIPPAGE);
+        });
+
+        it('returns zero if token -> token fails', async () => {
+            const sampleAmounts = getSampleAmounts(TAKER_TOKEN);
+            const expectedQuotes = _.times(sampleAmounts.length, () => constants.ZERO_AMOUNT);
+            await enableFailTriggerAsync();
+            const quotes = await testContract
+                .sampleBuysFromKyberNetwork(TAKER_TOKEN, MAKER_TOKEN, sampleAmounts, FAKE_BUY_OPTS)
+                .callAsync();
+            expect(quotes).to.deep.eq(expectedQuotes);
+        });
+
+        it('can quote token -> ETH', async () => {
+            const sampleAmounts = getSampleAmounts(TAKER_TOKEN);
+            const [expectedQuotes] = getDeterministicBuyQuotes(TAKER_TOKEN, WETH_ADDRESS, ['Kyber'], sampleAmounts);
+            const quotes = await testContract
+                .sampleBuysFromKyberNetwork(TAKER_TOKEN, WETH_ADDRESS, sampleAmounts, FAKE_BUY_OPTS)
+                .callAsync();
+            expectQuotesWithinRange(quotes, expectedQuotes, ACCEPTABLE_SLIPPAGE);
+        });
+
+        it('returns zero if token -> ETH fails', async () => {
+            const sampleAmounts = getSampleAmounts(TAKER_TOKEN);
+            const expectedQuotes = _.times(sampleAmounts.length, () => constants.ZERO_AMOUNT);
+            await enableFailTriggerAsync();
+            const quotes = await testContract
+                .sampleBuysFromKyberNetwork(TAKER_TOKEN, WETH_ADDRESS, sampleAmounts, FAKE_BUY_OPTS)
+                .callAsync();
+            expect(quotes).to.deep.eq(expectedQuotes);
+        });
+
+        it('can quote ETH -> token', async () => {
+            const sampleAmounts = getSampleAmounts(TAKER_TOKEN);
+            const [expectedQuotes] = getDeterministicBuyQuotes(WETH_ADDRESS, TAKER_TOKEN, ['Kyber'], sampleAmounts);
+            const quotes = await testContract
+                .sampleBuysFromKyberNetwork(WETH_ADDRESS, TAKER_TOKEN, sampleAmounts, FAKE_BUY_OPTS)
+                .callAsync();
+            expectQuotesWithinRange(quotes, expectedQuotes, ACCEPTABLE_SLIPPAGE);
+        });
+
+        it('returns zero if ETH -> token fails', async () => {
+            const sampleAmounts = getSampleAmounts(TAKER_TOKEN);
+            const expectedQuotes = _.times(sampleAmounts.length, () => constants.ZERO_AMOUNT);
+            await enableFailTriggerAsync();
+            const quotes = await testContract
+                .sampleBuysFromKyberNetwork(WETH_ADDRESS, TAKER_TOKEN, sampleAmounts, FAKE_BUY_OPTS)
+                .callAsync();
+            expect(quotes).to.deep.eq(expectedQuotes);
+        });
+    });
+
     blockchainTests.resets('sampleSellsFromEth2Dai()', () => {
         before(async () => {
             await testContract.createTokenExchanges([MAKER_TOKEN, TAKER_TOKEN]).awaitTransactionSuccessAsync();
@@ -1051,4 +851,236 @@ blockchainTests('erc20-bridge-sampler', env => {
             expect(quotes).to.deep.eq(expectedQuotes);
         });
     });
+
+    describe('getLiquidityProviderFromRegistry', () => {
+        const xAsset = randomAddress();
+        const yAsset = randomAddress();
+        const sampleAmounts = getSampleAmounts(yAsset);
+        let liquidityProvider: DummyLiquidityProviderContract;
+        let registryContract: DummyLiquidityProviderRegistryContract;
+
+        before(async () => {
+            liquidityProvider = await DummyLiquidityProviderContract.deployFrom0xArtifactAsync(
+                artifacts.DummyLiquidityProvider,
+                env.provider,
+                env.txDefaults,
+                {},
+            );
+
+            registryContract = await DummyLiquidityProviderRegistryContract.deployFrom0xArtifactAsync(
+                artifacts.DummyLiquidityProviderRegistry,
+                env.provider,
+                env.txDefaults,
+                {},
+            );
+            await registryContract
+                .setLiquidityProviderForMarket(xAsset, yAsset, liquidityProvider.address)
+                .awaitTransactionSuccessAsync();
+        });
+
+        it('should be able to get the liquidity provider', async () => {
+            const xyLiquidityProvider = await testContract
+                .getLiquidityProviderFromRegistry(registryContract.address, xAsset, yAsset)
+                .callAsync();
+            const yxLiquidityProvider = await testContract
+                .getLiquidityProviderFromRegistry(registryContract.address, yAsset, xAsset)
+                .callAsync();
+            const unknownLiquidityProvider = await testContract
+                .getLiquidityProviderFromRegistry(registryContract.address, yAsset, randomAddress())
+                .callAsync();
+
+            expect(xyLiquidityProvider).to.eq(liquidityProvider.address);
+            expect(yxLiquidityProvider).to.eq(liquidityProvider.address);
+            expect(unknownLiquidityProvider).to.eq(constants.NULL_ADDRESS);
+        });
+
+        it('should be able to query sells from the liquidity provider', async () => {
+            const result = await testContract
+                .sampleSellsFromLiquidityProviderRegistry(registryContract.address, yAsset, xAsset, sampleAmounts)
+                .callAsync();
+            result.forEach((value, idx) => {
+                expect(value).is.bignumber.eql(sampleAmounts[idx].minus(1));
+            });
+        });
+
+        it('should be able to query buys from the liquidity provider', async () => {
+            const result = await testContract
+                .sampleBuysFromLiquidityProviderRegistry(
+                    registryContract.address,
+                    yAsset,
+                    xAsset,
+                    sampleAmounts,
+                    FAKE_BUY_OPTS,
+                )
+                .callAsync();
+            result.forEach((value, idx) => {
+                expect(value).is.bignumber.eql(sampleAmounts[idx].plus(1));
+            });
+        });
+
+        it('should just return zeros if the liquidity provider cannot be found', async () => {
+            const result = await testContract
+                .sampleBuysFromLiquidityProviderRegistry(
+                    registryContract.address,
+                    yAsset,
+                    randomAddress(),
+                    sampleAmounts,
+                    FAKE_BUY_OPTS,
+                )
+                .callAsync();
+            result.forEach(value => {
+                expect(value).is.bignumber.eql(constants.ZERO_AMOUNT);
+            });
+        });
+
+        it('should just return zeros if the registry does not exist', async () => {
+            const result = await testContract
+                .sampleBuysFromLiquidityProviderRegistry(randomAddress(), yAsset, xAsset, sampleAmounts, FAKE_BUY_OPTS)
+                .callAsync();
+            result.forEach(value => {
+                expect(value).is.bignumber.eql(constants.ZERO_AMOUNT);
+            });
+        });
+    });
+
+    blockchainTests.resets('sampleSellsFromUniswapV2()', () => {
+        function predictSellQuotes(path: string[], sellAmounts: BigNumber[]): BigNumber[] {
+            return sellAmounts.map(a => getDeterministicUniswapV2SellQuote(path, a));
+        }
+
+        it('can return no quotes', async () => {
+            const quotes = await testContract.sampleSellsFromUniswapV2([TAKER_TOKEN, MAKER_TOKEN], []).callAsync();
+            expect(quotes).to.deep.eq([]);
+        });
+
+        it('can quote token -> token', async () => {
+            const sampleAmounts = getSampleAmounts(TAKER_TOKEN);
+            const expectedQuotes = predictSellQuotes([TAKER_TOKEN, MAKER_TOKEN], sampleAmounts);
+            const quotes = await testContract
+                .sampleSellsFromUniswapV2([TAKER_TOKEN, MAKER_TOKEN], sampleAmounts)
+                .callAsync();
+            expect(quotes).to.deep.eq(expectedQuotes);
+        });
+
+        it('returns zero if token -> token fails', async () => {
+            const sampleAmounts = getSampleAmounts(TAKER_TOKEN);
+            const expectedQuotes = _.times(sampleAmounts.length, () => constants.ZERO_AMOUNT);
+            await enableFailTriggerAsync();
+            const quotes = await testContract
+                .sampleSellsFromUniswapV2([TAKER_TOKEN, MAKER_TOKEN], sampleAmounts)
+                .callAsync();
+            expect(quotes).to.deep.eq(expectedQuotes);
+        });
+
+        it('can quote token -> token -> token', async () => {
+            const intermediateToken = randomAddress();
+            const sampleAmounts = getSampleAmounts(TAKER_TOKEN);
+            const expectedQuotes = predictSellQuotes([TAKER_TOKEN, intermediateToken, MAKER_TOKEN], sampleAmounts);
+            const quotes = await testContract
+                .sampleSellsFromUniswapV2([TAKER_TOKEN, intermediateToken, MAKER_TOKEN], sampleAmounts)
+                .callAsync();
+            expect(quotes).to.deep.eq(expectedQuotes);
+        });
+    });
+
+    blockchainTests.resets('sampleBuysFromUniswapV2()', () => {
+        function predictBuyQuotes(path: string[], buyAmounts: BigNumber[]): BigNumber[] {
+            return buyAmounts.map(a => getDeterministicUniswapV2BuyQuote(path, a));
+        }
+
+        it('can return no quotes', async () => {
+            const quotes = await testContract.sampleBuysFromUniswapV2([TAKER_TOKEN, MAKER_TOKEN], []).callAsync();
+            expect(quotes).to.deep.eq([]);
+        });
+
+        it('can quote token -> token', async () => {
+            const sampleAmounts = getSampleAmounts(MAKER_TOKEN);
+            const expectedQuotes = predictBuyQuotes([TAKER_TOKEN, MAKER_TOKEN], sampleAmounts);
+            const quotes = await testContract
+                .sampleBuysFromUniswapV2([TAKER_TOKEN, MAKER_TOKEN], sampleAmounts)
+                .callAsync();
+            expect(quotes).to.deep.eq(expectedQuotes);
+        });
+
+        it('returns zero if token -> token fails', async () => {
+            const sampleAmounts = getSampleAmounts(MAKER_TOKEN);
+            const expectedQuotes = _.times(sampleAmounts.length, () => constants.ZERO_AMOUNT);
+            await enableFailTriggerAsync();
+            const quotes = await testContract
+                .sampleBuysFromUniswapV2([TAKER_TOKEN, MAKER_TOKEN], sampleAmounts)
+                .callAsync();
+            expect(quotes).to.deep.eq(expectedQuotes);
+        });
+
+        it('can quote token -> token -> token', async () => {
+            const intermediateToken = randomAddress();
+            const sampleAmounts = getSampleAmounts(MAKER_TOKEN);
+            const expectedQuotes = predictBuyQuotes([TAKER_TOKEN, intermediateToken, MAKER_TOKEN], sampleAmounts);
+            const quotes = await testContract
+                .sampleBuysFromUniswapV2([TAKER_TOKEN, intermediateToken, MAKER_TOKEN], sampleAmounts)
+                .callAsync();
+            expect(quotes).to.deep.eq(expectedQuotes);
+        });
+    });
+
+    describe('batchCall()', () => {
+        it('can call one function', async () => {
+            const orders = createOrders(MAKER_TOKEN, TAKER_TOKEN);
+            const signatures: string[] = _.times(orders.length, i => hexUtils.random());
+            const expected = orders.map(getDeterministicFillableTakerAssetAmount);
+            const calls = [
+                testContract.getOrderFillableTakerAssetAmounts(orders, signatures).getABIEncodedTransactionData(),
+            ];
+            const r = await testContract.batchCall(calls).callAsync();
+            expect(r).to.be.length(1);
+            const actual = testContract.getABIDecodedReturnData<BigNumber[]>('getOrderFillableTakerAssetAmounts', r[0]);
+            expect(actual).to.deep.eq(expected);
+        });
+
+        it('can call two functions', async () => {
+            const numOrders = _.random(1, 10);
+            const orders = _.times(2, () => createOrders(MAKER_TOKEN, TAKER_TOKEN, numOrders));
+            const signatures: string[] = _.times(numOrders, i => hexUtils.random());
+            const expecteds = [
+                orders[0].map(getDeterministicFillableTakerAssetAmount),
+                orders[1].map(getDeterministicFillableMakerAssetAmount),
+            ];
+            const calls = [
+                testContract.getOrderFillableTakerAssetAmounts(orders[0], signatures).getABIEncodedTransactionData(),
+                testContract.getOrderFillableMakerAssetAmounts(orders[1], signatures).getABIEncodedTransactionData(),
+            ];
+            const r = await testContract.batchCall(calls).callAsync();
+            expect(r).to.be.length(2);
+            expect(testContract.getABIDecodedReturnData('getOrderFillableTakerAssetAmounts', r[0])).to.deep.eq(
+                expecteds[0],
+            );
+            expect(testContract.getABIDecodedReturnData('getOrderFillableMakerAssetAmounts', r[1])).to.deep.eq(
+                expecteds[1],
+            );
+        });
+
+        it('can make recursive calls', async () => {
+            const numOrders = _.random(1, 10);
+            const orders = createOrders(MAKER_TOKEN, TAKER_TOKEN, numOrders);
+            const signatures: string[] = _.times(numOrders, i => hexUtils.random());
+            const expected = orders.map(getDeterministicFillableTakerAssetAmount);
+            let r = await testContract
+                .batchCall([
+                    testContract
+                        .batchCall([
+                            testContract
+                                .getOrderFillableTakerAssetAmounts(orders, signatures)
+                                .getABIEncodedTransactionData(),
+                        ])
+                        .getABIEncodedTransactionData(),
+                ])
+                .callAsync();
+            expect(r).to.be.length(1);
+            r = testContract.getABIDecodedReturnData<string[]>('batchCall', r[0]);
+            expect(r).to.be.length(1);
+            expect(testContract.getABIDecodedReturnData('getOrderFillableTakerAssetAmounts', r[0])).to.deep.eq(
+                expected,
+            );
+        });
+    });
 });

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

@@ -3,10 +3,18 @@
  * Warning: This file is auto-generated by contracts-gen. Don't edit manually.
  * -----------------------------------------------------------------------------
  */
+export * from '../test/generated-wrappers/dummy_liquidity_provider';
+export * from '../test/generated-wrappers/dummy_liquidity_provider_registry';
 export * from '../test/generated-wrappers/erc20_bridge_sampler';
+export * from '../test/generated-wrappers/i_curve';
 export * from '../test/generated-wrappers/i_dev_utils';
 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_kyber_network_proxy';
+export * from '../test/generated-wrappers/i_liquidity_provider';
+export * from '../test/generated-wrappers/i_liquidity_provider_registry';
+export * from '../test/generated-wrappers/i_multi_bridge';
 export * from '../test/generated-wrappers/i_uniswap_exchange_quotes';
+export * from '../test/generated-wrappers/i_uniswap_v2_router01';
 export * from '../test/generated-wrappers/test_erc20_bridge_sampler';

contracts/erc20-bridge-sampler/tsconfig.json

@@ -3,14 +3,26 @@
     "compilerOptions": { "outDir": "lib", "rootDir": ".", "resolveJsonModule": true },
     "include": ["./src/**/*", "./test/**/*", "./generated-wrappers/**/*"],
     "files": [
+        "generated-artifacts/DummyLiquidityProvider.json",
+        "generated-artifacts/DummyLiquidityProviderRegistry.json",
         "generated-artifacts/ERC20BridgeSampler.json",
         "generated-artifacts/IERC20BridgeSampler.json",
+        "generated-artifacts/ILiquidityProvider.json",
+        "generated-artifacts/ILiquidityProviderRegistry.json",
+        "test/generated-artifacts/DummyLiquidityProvider.json",
+        "test/generated-artifacts/DummyLiquidityProviderRegistry.json",
         "test/generated-artifacts/ERC20BridgeSampler.json",
+        "test/generated-artifacts/ICurve.json",
         "test/generated-artifacts/IDevUtils.json",
         "test/generated-artifacts/IERC20BridgeSampler.json",
         "test/generated-artifacts/IEth2Dai.json",
         "test/generated-artifacts/IKyberNetwork.json",
+        "test/generated-artifacts/IKyberNetworkProxy.json",
+        "test/generated-artifacts/ILiquidityProvider.json",
+        "test/generated-artifacts/ILiquidityProviderRegistry.json",
+        "test/generated-artifacts/IMultiBridge.json",
         "test/generated-artifacts/IUniswapExchangeQuotes.json",
+        "test/generated-artifacts/IUniswapV2Router01.json",
         "test/generated-artifacts/TestERC20BridgeSampler.json"
     ],
     "exclude": ["./deploy/solc/solc_bin"]

contracts/erc20/CHANGELOG.json

@@ -1,4 +1,67 @@
 [
+    {
+        "version": "3.2.0",
+        "changes": [
+            {
+                "note": "Add `LibERC20Token.approveIfBelow()`",
+                "pr": 2512
+            },
+            {
+                "note": "Add solidity 0.6 contracts",
+                "pr": 2545
+            },
+            {
+                "note": "Update `LibERC20TokenV06` comments.",
+                "pr": 2597
+            }
+        ],
+        "timestamp": 1592969527
+    },
+    {
+        "timestamp": 1583220306,
+        "version": "3.1.5",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1582837861,
+        "version": "3.1.4",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1582677073,
+        "version": "3.1.3",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1582623685,
+        "version": "3.1.2",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1581748629,
+        "version": "3.1.1",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
     {
         "version": "3.1.0",
         "changes": [

contracts/erc20/CHANGELOG.md

@@ -5,6 +5,32 @@ Edit the package's CHANGELOG.json file only.
 
 CHANGELOG
 
+## v3.2.0 - _June 24, 2020_
+
+    * Add `LibERC20Token.approveIfBelow()` (#2512)
+    * Add solidity 0.6 contracts (#2545)
+    * Update `LibERC20TokenV06` comments. (#2597)
+
+## v3.1.5 - _March 3, 2020_
+
+    * Dependencies updated
+
+## v3.1.4 - _February 27, 2020_
+
+    * Dependencies updated
+
+## v3.1.3 - _February 26, 2020_
+
+    * Dependencies updated
+
+## v3.1.2 - _February 25, 2020_
+
+    * Dependencies updated
+
+## v3.1.1 - _February 15, 2020_
+
+    * Dependencies updated
+
 ## v3.1.0 - _February 8, 2020_
 
     * Add `allowance()` and `balanceOf()` to `LibERC20Token` (#2464)

contracts/erc20/compiler.json

@@ -3,6 +3,7 @@
     "contractsDir": "./contracts",
     "useDockerisedSolc": false,
     "isOfflineMode": false,
+    "shouldSaveStandardInput": true,
     "compilerSettings": {
         "evmVersion": "istanbul",
         "optimizer": {

contracts/erc20/contracts/src/LibERC20Token.sol

@@ -47,6 +47,25 @@ library LibERC20Token {
         _callWithOptionalBooleanResult(token, callData);
     }
 
+    /// @dev Calls `IERC20Token(token).approve()` and sets the allowance to the
+    ///      maximum if the current approval is not already >= an amount.
+    ///      Reverts if `false` is returned or if the return
+    ///      data length is nonzero and not 32 bytes.
+    /// @param token The address of the token contract.
+    /// @param spender The address that receives an allowance.
+    /// @param amount The minimum allowance needed.
+    function approveIfBelow(
+        address token,
+        address spender,
+        uint256 amount
+    )
+        internal
+    {
+        if (IERC20Token(token).allowance(address(this), spender) < amount) {
+            approve(token, spender, uint256(-1));
+        }
+    }
+
     /// @dev Calls `IERC20Token(token).transfer()`.
     ///      Reverts if `false` is returned or if the return
     ///      data length is nonzero and not 32 bytes.

contracts/erc20/contracts/src/v06/IERC20TokenV06.sol

@@ -0,0 +1,95 @@
+/*
+
+  Copyright 2020 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 ^0.6.5;
+
+
+interface IERC20TokenV06 {
+
+    // solhint-disable no-simple-event-func-name
+    event Transfer(
+        address indexed from,
+        address indexed to,
+        uint256 value
+    );
+
+    event Approval(
+        address indexed owner,
+        address indexed spender,
+        uint256 value
+    );
+
+    /// @dev send `value` token to `to` from `msg.sender`
+    /// @param to The address of the recipient
+    /// @param value The amount of token to be transferred
+    /// @return True if transfer was successful
+    function transfer(address to, uint256 value)
+        external
+        returns (bool);
+
+    /// @dev send `value` token to `to` from `from` on the condition it is approved by `from`
+    /// @param from The address of the sender
+    /// @param to The address of the recipient
+    /// @param value The amount of token to be transferred
+    /// @return True if transfer was successful
+    function transferFrom(
+        address from,
+        address to,
+        uint256 value
+    )
+        external
+        returns (bool);
+
+    /// @dev `msg.sender` approves `spender` to spend `value` tokens
+    /// @param spender The address of the account able to transfer the tokens
+    /// @param value The amount of wei to be approved for transfer
+    /// @return Always true if the call has enough gas to complete execution
+    function approve(address spender, uint256 value)
+        external
+        returns (bool);
+
+    /// @dev Query total supply of token
+    /// @return Total supply of token
+    function totalSupply()
+        external
+        view
+        returns (uint256);
+
+    /// @dev Get the balance of `owner`.
+    /// @param owner The address from which the balance will be retrieved
+    /// @return Balance of owner
+    function balanceOf(address owner)
+        external
+        view
+        returns (uint256);
+
+    /// @dev Get the allowance for `spender` to spend from `owner`.
+    /// @param owner The address of the account owning tokens
+    /// @param spender The address of the account able to transfer the tokens
+    /// @return Amount of remaining tokens allowed to spent
+    function allowance(address owner, address spender)
+        external
+        view
+        returns (uint256);
+
+    /// @dev Get the number of decimals this token has.
+    function decimals()
+        external
+        view
+        returns (uint8);
+}

contracts/erc20/contracts/src/v06/IEtherTokenV06.sol

@@ -0,0 +1,32 @@
+/*
+
+  Copyright 2020 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 ^0.6.5;
+
+import "./IERC20TokenV06.sol";
+
+
+interface IEtherTokenV06 is
+    IERC20TokenV06
+{
+    /// @dev Wrap ether.
+    function deposit() external payable;
+
+    /// @dev Unwrap ether.
+    function withdraw(uint256 amount) external;
+}

contracts/erc20/contracts/src/v06/LibERC20TokenV06.sol

@@ -0,0 +1,208 @@
+/*
+
+  Copyright 2020 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 ^0.6.5;
+
+import "@0x/contracts-utils/contracts/src/v06/errors/LibRichErrorsV06.sol";
+import "@0x/contracts-utils/contracts/src/v06/LibBytesV06.sol";
+import "./IERC20TokenV06.sol";
+
+
+library LibERC20TokenV06 {
+    bytes constant private DECIMALS_CALL_DATA = hex"313ce567";
+
+    /// @dev Calls `IERC20TokenV06(token).approve()`.
+    ///      Reverts if the result fails `isSuccessfulResult()` or the call reverts.
+    /// @param token The address of the token contract.
+    /// @param spender The address that receives an allowance.
+    /// @param allowance The allowance to set.
+    function compatApprove(
+        IERC20TokenV06 token,
+        address spender,
+        uint256 allowance
+    )
+        internal
+    {
+        bytes memory callData = abi.encodeWithSelector(
+            token.approve.selector,
+            spender,
+            allowance
+        );
+        _callWithOptionalBooleanResult(address(token), callData);
+    }
+
+    /// @dev Calls `IERC20TokenV06(token).approve()` and sets the allowance to the
+    ///      maximum if the current approval is not already >= an amount.
+    ///      Reverts if the result fails `isSuccessfulResult()` or the call reverts.
+    /// @param token The address of the token contract.
+    /// @param spender The address that receives an allowance.
+    /// @param amount The minimum allowance needed.
+    function approveIfBelow(
+        IERC20TokenV06 token,
+        address spender,
+        uint256 amount
+    )
+        internal
+    {
+        if (token.allowance(address(this), spender) < amount) {
+            compatApprove(token, spender, uint256(-1));
+        }
+    }
+
+    /// @dev Calls `IERC20TokenV06(token).transfer()`.
+    ///      Reverts if the result fails `isSuccessfulResult()` or the call reverts.
+    /// @param token The address of the token contract.
+    /// @param to The address that receives the tokens
+    /// @param amount Number of tokens to transfer.
+    function compatTransfer(
+        IERC20TokenV06 token,
+        address to,
+        uint256 amount
+    )
+        internal
+    {
+        bytes memory callData = abi.encodeWithSelector(
+            token.transfer.selector,
+            to,
+            amount
+        );
+        _callWithOptionalBooleanResult(address(token), callData);
+    }
+
+    /// @dev Calls `IERC20TokenV06(token).transferFrom()`.
+    ///      Reverts if the result fails `isSuccessfulResult()` or the call reverts.
+    /// @param token The address of the token contract.
+    /// @param from The owner of the tokens.
+    /// @param to The address that receives the tokens
+    /// @param amount Number of tokens to transfer.
+    function compatTransferFrom(
+        IERC20TokenV06 token,
+        address from,
+        address to,
+        uint256 amount
+    )
+        internal
+    {
+        bytes memory callData = abi.encodeWithSelector(
+            token.transferFrom.selector,
+            from,
+            to,
+            amount
+        );
+        _callWithOptionalBooleanResult(address(token), callData);
+    }
+
+    /// @dev Retrieves the number of decimals for a token.
+    ///      Returns `18` if the call reverts.
+    /// @param token The address of the token contract.
+    /// @return tokenDecimals The number of decimals places for the token.
+    function compatDecimals(IERC20TokenV06 token)
+        internal
+        view
+        returns (uint8 tokenDecimals)
+    {
+        tokenDecimals = 18;
+        (bool didSucceed, bytes memory resultData) = address(token).staticcall(DECIMALS_CALL_DATA);
+        if (didSucceed && resultData.length == 32) {
+            tokenDecimals = uint8(LibBytesV06.readUint256(resultData, 0));
+        }
+    }
+
+    /// @dev Retrieves the allowance for a token, owner, and spender.
+    ///      Returns `0` if the call reverts.
+    /// @param token The address of the token contract.
+    /// @param owner The owner of the tokens.
+    /// @param spender The address the spender.
+    /// @return allowance_ The allowance for a token, owner, and spender.
+    function compatAllowance(IERC20TokenV06 token, address owner, address spender)
+        internal
+        view
+        returns (uint256 allowance_)
+    {
+        (bool didSucceed, bytes memory resultData) = address(token).staticcall(
+            abi.encodeWithSelector(
+                token.allowance.selector,
+                owner,
+                spender
+            )
+        );
+        if (didSucceed && resultData.length == 32) {
+            allowance_ = LibBytesV06.readUint256(resultData, 0);
+        }
+    }
+
+    /// @dev Retrieves the balance for a token owner.
+    ///      Returns `0` if the call reverts.
+    /// @param token The address of the token contract.
+    /// @param owner The owner of the tokens.
+    /// @return balance The token balance of an owner.
+    function compatBalanceOf(IERC20TokenV06 token, address owner)
+        internal
+        view
+        returns (uint256 balance)
+    {
+        (bool didSucceed, bytes memory resultData) = address(token).staticcall(
+            abi.encodeWithSelector(
+                token.balanceOf.selector,
+                owner
+            )
+        );
+        if (didSucceed && resultData.length == 32) {
+            balance = LibBytesV06.readUint256(resultData, 0);
+        }
+    }
+
+    /// @dev Check if the data returned by a non-static call to an ERC20 token
+    ///      is a successful result. Supported functions are `transfer()`,
+    ///      `transferFrom()`, and `approve()`.
+    /// @param resultData The raw data returned by a non-static call to the ERC20 token.
+    /// @return isSuccessful Whether the result data indicates success.
+    function isSuccessfulResult(bytes memory resultData)
+        internal
+        pure
+        returns (bool isSuccessful)
+    {
+        if (resultData.length == 0) {
+            return true;
+        }
+        if (resultData.length == 32) {
+            uint256 result = LibBytesV06.readUint256(resultData, 0);
+            if (result == 1) {
+                return true;
+            }
+        }
+    }
+
+    /// @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`.
+    /// @param target The call target.
+    /// @param callData The abi-encoded call data.
+    function _callWithOptionalBooleanResult(
+        address target,
+        bytes memory callData
+    )
+        private
+    {
+        (bool didSucceed, bytes memory resultData) = target.call(callData);
+        if (didSucceed && isSuccessfulResult(resultData)) {
+            return;
+        }
+        LibRichErrorsV06.rrevert(resultData);
+    }
+}