Publish

- @0x/contracts-asset-proxy@3.7.3
 - @0x/contracts-broker@1.1.21
 - @0x/contracts-coordinator@3.1.22
 - @0x/contracts-dev-utils@1.3.20
 - @0x/contracts-erc1155@2.1.21
 - @0x/contracts-erc20@3.3.0
 - @0x/contracts-erc721@3.1.21
 - @0x/contracts-exchange-forwarder@4.2.22
 - @0x/contracts-exchange-libs@4.3.21
 - @0x/contracts-exchange@3.2.22
 - @0x/contracts-extensions@6.2.16
 - @0x/contracts-integrations@2.7.22
 - @0x/contracts-multisig@4.1.22
 - @0x/contracts-staking@2.0.29
 - @0x/contracts-test-utils@5.3.18
 - @0x/contracts-utils@4.7.0
 - @0x/contracts-zero-ex@0.17.0
 - @0x/asset-swapper@5.6.2
 - @0x/contract-artifacts@3.11.0
 - @0x/contract-wrappers-test@12.2.33
 - @0x/contract-wrappers@13.12.0
 - @0x/migrations@6.5.9
 - @0x/order-utils@10.4.13
 - @0x/protocol-utils@1.1.3

.readthedocs.yaml

@@ -0,0 +1,23 @@
+# Read the Docs configuration file
+# See https://docs.readthedocs.io/en/stable/config-file/v2.html for details
+
+# Required
+version: 2
+
+# Build documentation in the docs/ directory with Sphinx
+sphinx:
+  configuration: docs/conf.py
+
+# Build documentation with MkDocs
+#mkdocs:
+#  configuration: mkdocs.yml
+
+# Optionally build your docs in additional formats such as PDF
+#formats:
+#  - pdf
+
+# Optionally set the version of Python and requirements required to build your docs
+python:
+  version: 3.7
+  install:
+    - requirements: docs/requirements.txt

contracts/.solhint.json

@@ -13,9 +13,11 @@
         "indent": ["error", 4],
         "max-line-length": ["warn", 160],
         "no-inline-assembly": false,
+        "no-empty-blocks": false,
         "quotes": ["error", "double"],
         "separate-by-one-line-in-contract": "error",
         "space-after-comma": "error",
-        "statement-indent": "error"
+        "statement-indent": "error",
+        "no-empty-blocks": false
     }
 }

contracts/asset-proxy/CHANGELOG.json

@@ -1,4 +1,77 @@
 [
+    {
+        "timestamp": 1609802516,
+        "version": "3.7.3",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1608692071,
+        "version": "3.7.2",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1608245516,
+        "version": "3.7.1",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "version": "3.7.0",
+        "changes": [
+            {
+                "note": "Fix Bancor support of ETH",
+                "pr": 88
+            }
+        ],
+        "timestamp": 1608105788
+    },
+    {
+        "timestamp": 1607485227,
+        "version": "3.6.9",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1607381756,
+        "version": "3.6.8",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1606961263,
+        "version": "3.6.7",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1605763885,
+        "version": "3.6.6",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
     {
         "timestamp": 1605302002,
         "version": "3.6.5",

contracts/asset-proxy/CHANGELOG.md

@@ -5,6 +5,38 @@ Edit the package's CHANGELOG.json file only.
 
 CHANGELOG
 
+## v3.7.3 - _January 4, 2021_
+
+    * Dependencies updated
+
+## v3.7.2 - _December 23, 2020_
+
+    * Dependencies updated
+
+## v3.7.1 - _December 17, 2020_
+
+    * Dependencies updated
+
+## v3.7.0 - _December 16, 2020_
+
+    * Fix Bancor support of ETH (#88)
+
+## v3.6.9 - _December 9, 2020_
+
+    * Dependencies updated
+
+## v3.6.8 - _December 7, 2020_
+
+    * Dependencies updated
+
+## v3.6.7 - _December 3, 2020_
+
+    * Dependencies updated
+
+## v3.6.6 - _November 19, 2020_
+
+    * Dependencies updated
+
 ## v3.6.5 - _November 13, 2020_
 
     * Dependencies updated

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

@@ -21,6 +21,7 @@ pragma solidity ^0.5.9;
 pragma experimental ABIEncoderV2;
 
 import "@0x/contracts-erc20/contracts/src/interfaces/IERC20Token.sol";
+import "@0x/contracts-erc20/contracts/src/interfaces/IEtherToken.sol";
 import "@0x/contracts-erc20/contracts/src/LibERC20Token.sol";
 import "@0x/contracts-exchange-libs/contracts/src/IWallet.sol";
 import "@0x/contracts-utils/contracts/src/DeploymentConstants.sol";
@@ -36,6 +37,20 @@ contract BancorBridge is
     struct TransferState {
         address bancorNetworkAddress;
         address[] path;
+        IEtherToken weth;
+    }
+
+    /// @dev Bancor ETH pseudo-address.
+    address constant public BANCOR_ETH_ADDRESS = 0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE;
+
+    // solhint-disable no-empty-blocks
+    /// @dev Payable fallback to receive ETH from Bancor/WETH.
+    function ()
+        external
+        payable
+    {
+        // Poor man's receive in 0.5.9
+        require(msg.data.length == 0);
     }
 
     /// @dev Callback for `IERC20Bridge`. Tries to buy `amount` of
@@ -60,7 +75,6 @@ contract BancorBridge is
     {
         // hold variables to get around stack depth limitations
         TransferState memory state;
-
         // Decode the bridge data.
         (
             state.path,
@@ -68,34 +82,42 @@ contract BancorBridge is
         // solhint-disable indent
         ) = abi.decode(bridgeData, (address[], address));
         // solhint-enable indent
+        state.weth = IEtherToken(_getWethAddress());
 
-        require(state.path.length > 0, "BancorBridge/PATH_MUST_EXIST");
-        // Just transfer the tokens if they're the same.
-        if (state.path[0] == toTokenAddress) {
-            LibERC20Token.transfer(state.path[0], to, amount);
-            return BRIDGE_SUCCESS;
+        require(state.path.length >= 2, "BancorBridge/PATH_LENGTH_MUST_BE_GREATER_THAN_TWO");
+
+        // Grant an allowance to the Bancor Network to spend `fromTokenAddress` token.
+        uint256 fromTokenBalance;
+        uint256 payableAmount = 0;
+        // If it's ETH in the path then withdraw from WETH
+        // The Bancor path will have ETH as the 0xeee address
+        // Bancor expects to be paid in ETH not WETH
+        if (state.path[0] == BANCOR_ETH_ADDRESS) {
+            fromTokenBalance = state.weth.balanceOf(address(this));
+            state.weth.withdraw(fromTokenBalance);
+            payableAmount = fromTokenBalance;
+        } else {
+            fromTokenBalance = IERC20Token(state.path[0]).balanceOf(address(this));
+            LibERC20Token.approveIfBelow(state.path[0], state.bancorNetworkAddress, fromTokenBalance);
         }
 
-        // Otherwise use Bancor to convert
-        require(state.path.length > 2, "BancorBridge/PATH_LENGTH_MUST_BE_GREATER_THAN_TWO");
-        require(state.path[state.path.length - 1] == toTokenAddress, "BancorBridge/LAST_ELEMENT_OF_PATH_MUST_MATCH_OUTPUT_TOKEN");
-        
-        // // Grant an allowance to the Bancor Network to spend `fromTokenAddress` token.
-        uint256 fromTokenBalance = IERC20Token(state.path[0]).balanceOf(address(this));
-        LibERC20Token.approveIfBelow(state.path[0], state.bancorNetworkAddress, fromTokenBalance);
-
         // Convert the tokens
-        uint256 boughtAmount = IBancorNetwork(state.bancorNetworkAddress).convertByPath(
+        uint256 boughtAmount = IBancorNetwork(state.bancorNetworkAddress).convertByPath.value(payableAmount)(
             state.path, // path originating with source token and terminating in destination token
             fromTokenBalance, // amount of source token to trade
             amount, // minimum amount of destination token expected to receive
-            to, // beneficiary
+            state.path[state.path.length-1] == BANCOR_ETH_ADDRESS ? address(this) : to, // beneficiary
             address(0), // affiliateAccount; no fee paid
             0 // affiliateFee; no fee paid
         );
 
+        if (state.path[state.path.length-1] == BANCOR_ETH_ADDRESS) {
+            state.weth.deposit.value(boughtAmount)();
+            state.weth.transfer(to, boughtAmount);
+        }
+
         emit ERC20BridgeTransfer(
-            state.path[0], // fromTokenAddress
+            state.path[0] == BANCOR_ETH_ADDRESS ? address(state.weth) : state.path[0],
             toTokenAddress,
             fromTokenBalance,
             boughtAmount,
@@ -118,5 +140,5 @@ contract BancorBridge is
     {
         return LEGACY_WALLET_MAGIC_VALUE;
     }
-    
+
 }

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

@@ -0,0 +1,136 @@
+/*
+
+  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 CryptoComBridge is
+    IERC20Bridge,
+    IWallet,
+    DeploymentConstants
+{
+    struct TransferState {
+        address[] path;
+        address router;
+        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, state.router) = abi.decode(bridgeData, (address[], address));
+        // solhint-enable indent
+
+        require(state.path.length >= 2, "CryptoComBridge/PATH_LENGTH_MUST_BE_AT_LEAST_TWO");
+        require(state.path[state.path.length - 1] == toTokenAddress, "CryptoComBridge/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 SushiSwap router an allowance.
+        LibERC20Token.approveIfBelow(
+            state.path[0],
+            state.router,
+            state.fromTokenBalance
+        );
+
+        // Buy as much `toTokenAddress` token with `fromTokenAddress` token
+        // and transfer it to `to`.
+        IUniswapV2Router01 router = IUniswapV2Router01(state.router);
+        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/bridges/KyberBridge.sol

@@ -56,11 +56,14 @@ contract KyberBridge is
     uint256 constant private KYBER_RATE_BASE = 10 ** 18;
 
     // solhint-disable no-empty-blocks
-    /// @dev Payable fallback to receive ETH from Kyber.
+    /// @dev Payable fallback to receive ETH from Kyber/WETH.
     function ()
         external
         payable
-    {}
+    {
+        // Poor man's receive in 0.5.9
+        require(msg.data.length == 0);
+    }
 
     /// @dev Callback for `IKyberBridge`. Tries to buy `amount` of
     ///      `toTokenAddress` tokens by selling the entirety of the opposing asset

contracts/asset-proxy/package.json

@@ -1,6 +1,6 @@
 {
     "name": "@0x/contracts-asset-proxy",
-    "version": "3.6.5",
+    "version": "3.7.3",
     "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/@(BalancerBridge|BancorBridge|ChaiBridge|CreamBridge|CurveBridge|DODOBridge|DexForwarderBridge|DydxBridge|ERC1155Proxy|ERC20BridgeProxy|ERC20Proxy|ERC721Proxy|Eth2DaiBridge|IAssetData|IAssetProxy|IAssetProxyDispatcher|IAuthorizable|IBalancerPool|IBancorNetwork|IChai|ICurve|IDydx|IDydxBridge|IERC20Bridge|IEth2Dai|IGasToken|IKyberNetworkProxy|IMStable|IMooniswap|IShell|IUniswapExchange|IUniswapExchangeFactory|IUniswapV2Router01|KyberBridge|MStableBridge|MixinAssetProxyDispatcher|MixinAuthorizable|MixinGasToken|MooniswapBridge|MultiAssetProxy|Ownable|ShellBridge|SnowSwapBridge|StaticCallProxy|SushiSwapBridge|SwerveBridge|TestBancorBridge|TestChaiBridge|TestDexForwarderBridge|TestDydxBridge|TestERC20Bridge|TestEth2DaiBridge|TestKyberBridge|TestStaticCallTarget|TestUniswapBridge|TestUniswapV2Bridge|UniswapBridge|UniswapV2Bridge).json",
+        "abis": "./test/generated-artifacts/@(BalancerBridge|BancorBridge|ChaiBridge|CreamBridge|CryptoComBridge|CurveBridge|DODOBridge|DexForwarderBridge|DydxBridge|ERC1155Proxy|ERC20BridgeProxy|ERC20Proxy|ERC721Proxy|Eth2DaiBridge|IAssetData|IAssetProxy|IAssetProxyDispatcher|IAuthorizable|IBalancerPool|IBancorNetwork|IChai|ICurve|IDydx|IDydxBridge|IERC20Bridge|IEth2Dai|IGasToken|IKyberNetworkProxy|IMStable|IMooniswap|IShell|IUniswapExchange|IUniswapExchangeFactory|IUniswapV2Router01|KyberBridge|MStableBridge|MixinAssetProxyDispatcher|MixinAuthorizable|MixinGasToken|MooniswapBridge|MultiAssetProxy|Ownable|ShellBridge|SnowSwapBridge|StaticCallProxy|SushiSwapBridge|SwerveBridge|TestBancorBridge|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": {
@@ -51,13 +51,13 @@
     },
     "homepage": "https://github.com/0xProject/protocol/tree/main/contracts/protocol",
     "devDependencies": {
-        "@0x/abi-gen": "^5.4.7",
-        "@0x/contract-wrappers": "^13.10.0",
-        "@0x/contracts-gen": "2.0.18",
-        "@0x/contracts-test-utils": "^5.3.11",
-        "@0x/contracts-utils": "^4.5.8",
-        "@0x/dev-utils": "^4.0.1",
-        "@0x/sol-compiler": "^4.2.7",
+        "@0x/abi-gen": "^5.4.13",
+        "@0x/contract-wrappers": "^13.12.0",
+        "@0x/contracts-gen": "^2.0.24",
+        "@0x/contracts-test-utils": "^5.3.18",
+        "@0x/contracts-utils": "^4.7.0",
+        "@0x/dev-utils": "^4.1.3",
+        "@0x/sol-compiler": "^4.4.1",
         "@0x/ts-doc-gen": "^0.0.28",
         "@0x/tslint-config": "^4.1.3",
         "@types/lodash": "4.14.104",
@@ -79,17 +79,17 @@
         "typescript": "3.0.1"
     },
     "dependencies": {
-        "@0x/base-contract": "^6.2.11",
-        "@0x/contracts-erc1155": "^2.1.14",
-        "@0x/contracts-erc20": "^3.2.8",
-        "@0x/contracts-erc721": "^3.1.14",
-        "@0x/contracts-exchange-libs": "^4.3.14",
-        "@0x/order-utils": "^10.4.6",
-        "@0x/types": "^3.3.0",
-        "@0x/typescript-typings": "^5.1.5",
-        "@0x/utils": "^6.1.0",
-        "@0x/web3-wrapper": "^7.2.8",
-        "ethereum-types": "^3.3.3",
+        "@0x/base-contract": "^6.2.14",
+        "@0x/contracts-erc1155": "^2.1.21",
+        "@0x/contracts-erc20": "^3.3.0",
+        "@0x/contracts-erc721": "^3.1.21",
+        "@0x/contracts-exchange-libs": "^4.3.21",
+        "@0x/order-utils": "^10.4.13",
+        "@0x/types": "^3.3.1",
+        "@0x/typescript-typings": "^5.1.6",
+        "@0x/utils": "^6.1.1",
+        "@0x/web3-wrapper": "^7.3.0",
+        "ethereum-types": "^3.4.0",
         "lodash": "^4.17.11"
     },
     "publishConfig": {

contracts/asset-proxy/src/artifacts.ts

@@ -9,6 +9,7 @@ import * as BalancerBridge from '../generated-artifacts/BalancerBridge.json';
 import * as BancorBridge from '../generated-artifacts/BancorBridge.json';
 import * as ChaiBridge from '../generated-artifacts/ChaiBridge.json';
 import * as CreamBridge from '../generated-artifacts/CreamBridge.json';
+import * as CryptoComBridge from '../generated-artifacts/CryptoComBridge.json';
 import * as CurveBridge from '../generated-artifacts/CurveBridge.json';
 import * as DexForwarderBridge from '../generated-artifacts/DexForwarderBridge.json';
 import * as DODOBridge from '../generated-artifacts/DODOBridge.json';
@@ -77,6 +78,7 @@ export const artifacts = {
     BancorBridge: BancorBridge as ContractArtifact,
     ChaiBridge: ChaiBridge as ContractArtifact,
     CreamBridge: CreamBridge as ContractArtifact,
+    CryptoComBridge: CryptoComBridge as ContractArtifact,
     CurveBridge: CurveBridge as ContractArtifact,
     DODOBridge: DODOBridge as ContractArtifact,
     DexForwarderBridge: DexForwarderBridge as ContractArtifact,

contracts/asset-proxy/src/wrappers.ts

@@ -7,6 +7,7 @@ export * from '../generated-wrappers/balancer_bridge';
 export * from '../generated-wrappers/bancor_bridge';
 export * from '../generated-wrappers/chai_bridge';
 export * from '../generated-wrappers/cream_bridge';
+export * from '../generated-wrappers/crypto_com_bridge';
 export * from '../generated-wrappers/curve_bridge';
 export * from '../generated-wrappers/d_o_d_o_bridge';
 export * from '../generated-wrappers/dex_forwarder_bridge';

contracts/asset-proxy/test/artifacts.ts

@@ -9,6 +9,7 @@ import * as BalancerBridge from '../test/generated-artifacts/BalancerBridge.json
 import * as BancorBridge from '../test/generated-artifacts/BancorBridge.json';
 import * as ChaiBridge from '../test/generated-artifacts/ChaiBridge.json';
 import * as CreamBridge from '../test/generated-artifacts/CreamBridge.json';
+import * as CryptoComBridge from '../test/generated-artifacts/CryptoComBridge.json';
 import * as CurveBridge from '../test/generated-artifacts/CurveBridge.json';
 import * as DexForwarderBridge from '../test/generated-artifacts/DexForwarderBridge.json';
 import * as DODOBridge from '../test/generated-artifacts/DODOBridge.json';
@@ -77,6 +78,7 @@ export const artifacts = {
     BancorBridge: BancorBridge as ContractArtifact,
     ChaiBridge: ChaiBridge as ContractArtifact,
     CreamBridge: CreamBridge as ContractArtifact,
+    CryptoComBridge: CryptoComBridge as ContractArtifact,
     CurveBridge: CurveBridge as ContractArtifact,
     DODOBridge: DODOBridge as ContractArtifact,
     DexForwarderBridge: DexForwarderBridge as ContractArtifact,

contracts/asset-proxy/test/bancor_bridge.ts

@@ -12,13 +12,11 @@ import { DecodedLogs } from 'ethereum-types';
 import * as _ from 'lodash';
 
 import { artifacts } from './artifacts';
-
 import { TestBancorBridgeContract } from './generated-wrappers/test_bancor_bridge';
 import {
     TestBancorBridgeConvertByPathInputEventArgs as ConvertByPathArgs,
     TestBancorBridgeEvents as ContractEvents,
     TestBancorBridgeTokenApproveEventArgs as TokenApproveArgs,
-    TestBancorBridgeTokenTransferEventArgs as TokenTransferArgs,
 } from './wrappers';
 
 blockchainTests.resets('Bancor unit tests', env => {
@@ -128,24 +126,6 @@ blockchainTests.resets('Bancor unit tests', env => {
             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 BancorNetwork.convertByPath()', async () => {
                 const { opts, result, logs } = await transferFromAsync();

contracts/asset-proxy/test/wrappers.ts

@@ -7,6 +7,7 @@ export * from '../test/generated-wrappers/balancer_bridge';
 export * from '../test/generated-wrappers/bancor_bridge';
 export * from '../test/generated-wrappers/chai_bridge';
 export * from '../test/generated-wrappers/cream_bridge';
+export * from '../test/generated-wrappers/crypto_com_bridge';
 export * from '../test/generated-wrappers/curve_bridge';
 export * from '../test/generated-wrappers/d_o_d_o_bridge';
 export * from '../test/generated-wrappers/dex_forwarder_bridge';

contracts/asset-proxy/tsconfig.json

@@ -7,6 +7,7 @@
         "generated-artifacts/BancorBridge.json",
         "generated-artifacts/ChaiBridge.json",
         "generated-artifacts/CreamBridge.json",
+        "generated-artifacts/CryptoComBridge.json",
         "generated-artifacts/CurveBridge.json",
         "generated-artifacts/DODOBridge.json",
         "generated-artifacts/DexForwarderBridge.json",
@@ -65,6 +66,7 @@
         "test/generated-artifacts/BancorBridge.json",
         "test/generated-artifacts/ChaiBridge.json",
         "test/generated-artifacts/CreamBridge.json",
+        "test/generated-artifacts/CryptoComBridge.json",
         "test/generated-artifacts/CurveBridge.json",
         "test/generated-artifacts/DODOBridge.json",
         "test/generated-artifacts/DexForwarderBridge.json",

contracts/broker/CHANGELOG.json

@@ -1,4 +1,76 @@
 [
+    {
+        "timestamp": 1609802516,
+        "version": "1.1.21",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1608692071,
+        "version": "1.1.20",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1608245516,
+        "version": "1.1.19",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1608105788,
+        "version": "1.1.18",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1607485227,
+        "version": "1.1.17",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1607381756,
+        "version": "1.1.16",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1606961263,
+        "version": "1.1.15",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1605763885,
+        "version": "1.1.14",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
     {
         "timestamp": 1605302002,
         "version": "1.1.13",

contracts/broker/CHANGELOG.md

@@ -5,6 +5,38 @@ Edit the package's CHANGELOG.json file only.
 
 CHANGELOG
 
+## v1.1.21 - _January 4, 2021_
+
+    * Dependencies updated
+
+## v1.1.20 - _December 23, 2020_
+
+    * Dependencies updated
+
+## v1.1.19 - _December 17, 2020_
+
+    * Dependencies updated
+
+## v1.1.18 - _December 16, 2020_
+
+    * Dependencies updated
+
+## v1.1.17 - _December 9, 2020_
+
+    * Dependencies updated
+
+## v1.1.16 - _December 7, 2020_
+
+    * Dependencies updated
+
+## v1.1.15 - _December 3, 2020_
+
+    * Dependencies updated
+
+## v1.1.14 - _November 19, 2020_
+
+    * Dependencies updated
+
 ## v1.1.13 - _November 13, 2020_
 
     * Dependencies updated

contracts/broker/package.json

@@ -1,6 +1,6 @@
 {
     "name": "@0x/contracts-broker",
-    "version": "1.1.13",
+    "version": "1.1.21",
     "engines": {
         "node": ">=6.12"
     },
@@ -51,20 +51,20 @@
     },
     "homepage": "https://github.com/0xProject/protocol/tree/main/contracts/extensions",
     "devDependencies": {
-        "@0x/abi-gen": "^5.4.7",
-        "@0x/contracts-asset-proxy": "^3.6.5",
-        "@0x/contracts-erc20": "^3.2.8",
-        "@0x/contracts-erc721": "^3.1.14",
-        "@0x/contracts-exchange": "^3.2.14",
-        "@0x/contracts-exchange-libs": "^4.3.14",
-        "@0x/contracts-gen": "2.0.18",
-        "@0x/contracts-test-utils": "^5.3.11",
-        "@0x/contracts-utils": "^4.5.8",
-        "@0x/sol-compiler": "^4.2.7",
+        "@0x/abi-gen": "^5.4.13",
+        "@0x/contracts-asset-proxy": "^3.7.3",
+        "@0x/contracts-erc20": "^3.3.0",
+        "@0x/contracts-erc721": "^3.1.21",
+        "@0x/contracts-exchange": "^3.2.22",
+        "@0x/contracts-exchange-libs": "^4.3.21",
+        "@0x/contracts-gen": "^2.0.24",
+        "@0x/contracts-test-utils": "^5.3.18",
+        "@0x/contracts-utils": "^4.7.0",
+        "@0x/sol-compiler": "^4.4.1",
         "@0x/ts-doc-gen": "^0.0.28",
         "@0x/tslint-config": "^4.1.3",
-        "@0x/types": "^3.3.0",
-        "@0x/web3-wrapper": "^7.2.8",
+        "@0x/types": "^3.3.1",
+        "@0x/web3-wrapper": "^7.3.0",
         "@types/lodash": "4.14.104",
         "@types/mocha": "^5.2.7",
         "@types/node": "12.12.54",
@@ -84,11 +84,11 @@
         "typescript": "3.0.1"
     },
     "dependencies": {
-        "@0x/base-contract": "^6.2.11",
-        "@0x/order-utils": "^10.4.6",
-        "@0x/typescript-typings": "^5.1.5",
-        "@0x/utils": "^6.1.0",
-        "ethereum-types": "^3.3.3"
+        "@0x/base-contract": "^6.2.14",
+        "@0x/order-utils": "^10.4.13",
+        "@0x/typescript-typings": "^5.1.6",
+        "@0x/utils": "^6.1.1",
+        "ethereum-types": "^3.4.0"
     },
     "publishConfig": {
         "access": "public"

contracts/coordinator/CHANGELOG.json

@@ -1,4 +1,76 @@
 [
+    {
+        "timestamp": 1609802516,
+        "version": "3.1.22",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1608692071,
+        "version": "3.1.21",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1608245516,
+        "version": "3.1.20",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1608105788,
+        "version": "3.1.19",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1607485227,
+        "version": "3.1.18",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1607381756,
+        "version": "3.1.17",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1606961263,
+        "version": "3.1.16",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1605763885,
+        "version": "3.1.15",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
     {
         "timestamp": 1605302002,
         "version": "3.1.14",

contracts/coordinator/CHANGELOG.md

@@ -5,6 +5,38 @@ Edit the package's CHANGELOG.json file only.
 
 CHANGELOG
 
+## v3.1.22 - _January 4, 2021_
+
+    * Dependencies updated
+
+## v3.1.21 - _December 23, 2020_
+
+    * Dependencies updated
+
+## v3.1.20 - _December 17, 2020_
+
+    * Dependencies updated
+
+## v3.1.19 - _December 16, 2020_
+
+    * Dependencies updated
+
+## v3.1.18 - _December 9, 2020_
+
+    * Dependencies updated
+
+## v3.1.17 - _December 7, 2020_
+
+    * Dependencies updated
+
+## v3.1.16 - _December 3, 2020_
+
+    * Dependencies updated
+
+## v3.1.15 - _November 19, 2020_
+
+    * Dependencies updated
+
 ## v3.1.14 - _November 13, 2020_
 
     * Dependencies updated

contracts/coordinator/package.json

@@ -1,6 +1,6 @@
 {
     "name": "@0x/contracts-coordinator",
-    "version": "3.1.14",
+    "version": "3.1.22",
     "engines": {
         "node": ">=6.12"
     },
@@ -52,17 +52,17 @@
     },
     "homepage": "https://github.com/0xProject/protocol/tree/main/contracts/extensions",
     "devDependencies": {
-        "@0x/abi-gen": "^5.4.7",
-        "@0x/contracts-asset-proxy": "^3.6.5",
-        "@0x/contracts-dev-utils": "^1.3.12",
-        "@0x/contracts-erc20": "^3.2.8",
-        "@0x/contracts-gen": "2.0.18",
-        "@0x/dev-utils": "^4.0.1",
-        "@0x/order-utils": "^10.4.6",
-        "@0x/sol-compiler": "^4.2.7",
+        "@0x/abi-gen": "^5.4.13",
+        "@0x/contracts-asset-proxy": "^3.7.3",
+        "@0x/contracts-dev-utils": "^1.3.20",
+        "@0x/contracts-erc20": "^3.3.0",
+        "@0x/contracts-gen": "^2.0.24",
+        "@0x/dev-utils": "^4.1.3",
+        "@0x/order-utils": "^10.4.13",
+        "@0x/sol-compiler": "^4.4.1",
         "@0x/ts-doc-gen": "^0.0.28",
         "@0x/tslint-config": "^4.1.3",
-        "@0x/web3-wrapper": "^7.2.8",
+        "@0x/web3-wrapper": "^7.3.0",
         "@types/lodash": "4.14.104",
         "@types/mocha": "^5.2.7",
         "@types/node": "12.12.54",
@@ -82,17 +82,17 @@
         "typescript": "3.0.1"
     },
     "dependencies": {
-        "@0x/assert": "^3.0.17",
-        "@0x/base-contract": "^6.2.11",
-        "@0x/contract-addresses": "^5.3.0",
-        "@0x/contracts-exchange": "^3.2.14",
-        "@0x/contracts-test-utils": "^5.3.11",
-        "@0x/contracts-utils": "^4.5.8",
-        "@0x/json-schemas": "^5.3.3",
-        "@0x/types": "^3.3.0",
-        "@0x/typescript-typings": "^5.1.5",
-        "@0x/utils": "^6.1.0",
-        "ethereum-types": "^3.3.3",
+        "@0x/assert": "^3.0.19",
+        "@0x/base-contract": "^6.2.14",
+        "@0x/contract-addresses": "^5.8.0",
+        "@0x/contracts-exchange": "^3.2.22",
+        "@0x/contracts-test-utils": "^5.3.18",
+        "@0x/contracts-utils": "^4.7.0",
+        "@0x/json-schemas": "^5.3.4",
+        "@0x/types": "^3.3.1",
+        "@0x/typescript-typings": "^5.1.6",
+        "@0x/utils": "^6.1.1",
+        "ethereum-types": "^3.4.0",
         "http-status-codes": "^1.3.2"
     },
     "publishConfig": {

contracts/dev-utils/CHANGELOG.json

@@ -1,4 +1,76 @@
 [
+    {
+        "timestamp": 1609802516,
+        "version": "1.3.20",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1608692071,
+        "version": "1.3.19",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1608245516,
+        "version": "1.3.18",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1608105788,
+        "version": "1.3.17",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1607485227,
+        "version": "1.3.16",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1607381756,
+        "version": "1.3.15",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1606961263,
+        "version": "1.3.14",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1605763885,
+        "version": "1.3.13",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
     {
         "timestamp": 1605302002,
         "version": "1.3.12",

contracts/dev-utils/CHANGELOG.md

@@ -5,6 +5,38 @@ Edit the package's CHANGELOG.json file only.
 
 CHANGELOG
 
+## v1.3.20 - _January 4, 2021_
+
+    * Dependencies updated
+
+## v1.3.19 - _December 23, 2020_
+
+    * Dependencies updated
+
+## v1.3.18 - _December 17, 2020_
+
+    * Dependencies updated
+
+## v1.3.17 - _December 16, 2020_
+
+    * Dependencies updated
+
+## v1.3.16 - _December 9, 2020_
+
+    * Dependencies updated
+
+## v1.3.15 - _December 7, 2020_
+
+    * Dependencies updated
+
+## v1.3.14 - _December 3, 2020_
+
+    * Dependencies updated
+
+## v1.3.13 - _November 19, 2020_
+
+    * Dependencies updated
+
 ## v1.3.12 - _November 13, 2020_
 
     * Dependencies updated

contracts/dev-utils/package.json

@@ -1,6 +1,6 @@
 {
     "name": "@0x/contracts-dev-utils",
-    "version": "1.3.12",
+    "version": "1.3.20",
     "engines": {
         "node": ">=6.12"
     },
@@ -41,18 +41,18 @@
     },
     "homepage": "https://github.com/0xProject/protocol/tree/main/contracts/dev-utils",
     "devDependencies": {
-        "@0x/abi-gen": "^5.4.7",
-        "@0x/assert": "^3.0.17",
-        "@0x/contracts-asset-proxy": "^3.6.5",
-        "@0x/contracts-erc20": "^3.2.8",
-        "@0x/contracts-gen": "2.0.18",
-        "@0x/contracts-test-utils": "^5.3.11",
-        "@0x/sol-compiler": "^4.2.7",
+        "@0x/abi-gen": "^5.4.13",
+        "@0x/assert": "^3.0.19",
+        "@0x/contracts-asset-proxy": "^3.7.3",
+        "@0x/contracts-erc20": "^3.3.0",
+        "@0x/contracts-gen": "^2.0.24",
+        "@0x/contracts-test-utils": "^5.3.18",
+        "@0x/sol-compiler": "^4.4.1",
         "@0x/ts-doc-gen": "^0.0.28",
         "@0x/tslint-config": "^4.1.3",
-        "@0x/types": "^3.3.0",
-        "@0x/utils": "^6.1.0",
-        "ethereum-types": "^3.3.3",
+        "@0x/types": "^3.3.1",
+        "@0x/utils": "^6.1.1",
+        "ethereum-types": "^3.4.0",
         "ethers": "~4.0.4",
         "npm-run-all": "^4.1.2",
         "shx": "^0.2.2",
@@ -63,7 +63,7 @@
         "typescript": "3.0.1"
     },
     "dependencies": {
-        "@0x/base-contract": "^6.2.11",
+        "@0x/base-contract": "^6.2.14",
         "@types/node": "12.12.54"
     },
     "publishConfig": {

contracts/erc1155/CHANGELOG.json

@@ -1,4 +1,67 @@
 [
+    {
+        "timestamp": 1609802516,
+        "version": "2.1.21",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1608692071,
+        "version": "2.1.20",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1608245516,
+        "version": "2.1.19",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1607485227,
+        "version": "2.1.18",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1607381756,
+        "version": "2.1.17",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1606961263,
+        "version": "2.1.16",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1605763885,
+        "version": "2.1.15",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
     {
         "timestamp": 1605302002,
         "version": "2.1.14",

contracts/erc1155/CHANGELOG.md

@@ -5,6 +5,34 @@ Edit the package's CHANGELOG.json file only.
 
 CHANGELOG
 
+## v2.1.21 - _January 4, 2021_
+
+    * Dependencies updated
+
+## v2.1.20 - _December 23, 2020_
+
+    * Dependencies updated
+
+## v2.1.19 - _December 17, 2020_
+
+    * Dependencies updated
+
+## v2.1.18 - _December 9, 2020_
+
+    * Dependencies updated
+
+## v2.1.17 - _December 7, 2020_
+
+    * Dependencies updated
+
+## v2.1.16 - _December 3, 2020_
+
+    * Dependencies updated
+
+## v2.1.15 - _November 19, 2020_
+
+    * Dependencies updated
+
 ## v2.1.14 - _November 13, 2020_
 
     * Dependencies updated

contracts/erc1155/package.json

@@ -1,6 +1,6 @@
 {
     "name": "@0x/contracts-erc1155",
-    "version": "2.1.14",
+    "version": "2.1.21",
     "engines": {
         "node": ">=6.12"
     },
@@ -52,15 +52,15 @@
     },
     "homepage": "https://github.com/0xProject/protocol/tree/main/contracts/tokens",
     "devDependencies": {
-        "@0x/abi-gen": "^5.4.7",
-        "@0x/contracts-gen": "2.0.18",
-        "@0x/contracts-utils": "^4.5.8",
-        "@0x/dev-utils": "^4.0.1",
-        "@0x/sol-compiler": "^4.2.7",
+        "@0x/abi-gen": "^5.4.13",
+        "@0x/contracts-gen": "^2.0.24",
+        "@0x/contracts-utils": "^4.7.0",
+        "@0x/dev-utils": "^4.1.3",
+        "@0x/sol-compiler": "^4.4.1",
         "@0x/ts-doc-gen": "^0.0.28",
         "@0x/tslint-config": "^4.1.3",
-        "@0x/types": "^3.3.0",
-        "@0x/typescript-typings": "^5.1.5",
+        "@0x/types": "^3.3.1",
+        "@0x/typescript-typings": "^5.1.6",
         "@types/lodash": "4.14.104",
         "@types/mocha": "^5.2.7",
         "@types/node": "12.12.54",
@@ -68,7 +68,7 @@
         "chai-as-promised": "^7.1.0",
         "chai-bignumber": "^3.0.0",
         "dirty-chai": "^2.0.1",
-        "ethereum-types": "^3.3.3",
+        "ethereum-types": "^3.4.0",
         "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": "^6.2.11",
-        "@0x/contracts-test-utils": "^5.3.11",
-        "@0x/utils": "^6.1.0",
-        "@0x/web3-wrapper": "^7.2.8",
+        "@0x/base-contract": "^6.2.14",
+        "@0x/contracts-test-utils": "^5.3.18",
+        "@0x/utils": "^6.1.1",
+        "@0x/web3-wrapper": "^7.3.0",
         "lodash": "^4.17.11"
     },
     "publishConfig": {

contracts/erc20/CHANGELOG.json

@@ -1,4 +1,68 @@
 [
+    {
+        "version": "3.3.0",
+        "changes": [
+            {
+                "note": "Allow for excess return data in `LibERC20TokenV06` compat* functions",
+                "pr": 97
+            }
+        ],
+        "timestamp": 1609802516
+    },
+    {
+        "timestamp": 1608692071,
+        "version": "3.2.14",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1608245516,
+        "version": "3.2.13",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1607485227,
+        "version": "3.2.12",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1607381756,
+        "version": "3.2.11",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1606961263,
+        "version": "3.2.10",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1605763885,
+        "version": "3.2.9",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
     {
         "timestamp": 1605302002,
         "version": "3.2.8",

contracts/erc20/CHANGELOG.md

@@ -5,6 +5,34 @@ Edit the package's CHANGELOG.json file only.
 
 CHANGELOG
 
+## v3.3.0 - _January 4, 2021_
+
+    * Allow for excess return data in `LibERC20TokenV06` compat* functions (#97)
+
+## v3.2.14 - _December 23, 2020_
+
+    * Dependencies updated
+
+## v3.2.13 - _December 17, 2020_
+
+    * Dependencies updated
+
+## v3.2.12 - _December 9, 2020_
+
+    * Dependencies updated
+
+## v3.2.11 - _December 7, 2020_
+
+    * Dependencies updated
+
+## v3.2.10 - _December 3, 2020_
+
+    * Dependencies updated
+
+## v3.2.9 - _November 19, 2020_
+
+    * Dependencies updated
+
 ## v3.2.8 - _November 13, 2020_
 
     * Dependencies updated

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

@@ -118,7 +118,7 @@ library LibERC20TokenV06 {
     {
         tokenDecimals = 18;
         (bool didSucceed, bytes memory resultData) = address(token).staticcall(DECIMALS_CALL_DATA);
-        if (didSucceed && resultData.length == 32) {
+        if (didSucceed && resultData.length >= 32) {
             tokenDecimals = uint8(LibBytesV06.readUint256(resultData, 0));
         }
     }
@@ -141,7 +141,7 @@ library LibERC20TokenV06 {
                 spender
             )
         );
-        if (didSucceed && resultData.length == 32) {
+        if (didSucceed && resultData.length >= 32) {
             allowance_ = LibBytesV06.readUint256(resultData, 0);
         }
     }
@@ -162,7 +162,7 @@ library LibERC20TokenV06 {
                 owner
             )
         );
-        if (didSucceed && resultData.length == 32) {
+        if (didSucceed && resultData.length >= 32) {
             balance = LibBytesV06.readUint256(resultData, 0);
         }
     }
@@ -180,7 +180,7 @@ library LibERC20TokenV06 {
         if (resultData.length == 0) {
             return true;
         }
-        if (resultData.length == 32) {
+        if (resultData.length >= 32) {
             uint256 result = LibBytesV06.readUint256(resultData, 0);
             if (result == 1) {
                 return true;

contracts/erc20/package.json

@@ -1,6 +1,6 @@
 {
     "name": "@0x/contracts-erc20",
-    "version": "3.2.8",
+    "version": "3.3.0",
     "engines": {
         "node": ">=6.12"
     },
@@ -51,18 +51,18 @@
     },
     "homepage": "https://github.com/0xProject/protocol/tree/main/contracts/tokens",
     "devDependencies": {
-        "@0x/abi-gen": "^5.4.7",
-        "@0x/contracts-gen": "2.0.18",
-        "@0x/contracts-test-utils": "^5.3.11",
-        "@0x/contracts-utils": "^4.5.8",
-        "@0x/dev-utils": "^4.0.1",
-        "@0x/sol-compiler": "^4.2.7",
+        "@0x/abi-gen": "^5.4.13",
+        "@0x/contracts-gen": "^2.0.24",
+        "@0x/contracts-test-utils": "^5.3.18",
+        "@0x/contracts-utils": "^4.7.0",
+        "@0x/dev-utils": "^4.1.3",
+        "@0x/sol-compiler": "^4.4.1",
         "@0x/ts-doc-gen": "^0.0.28",
         "@0x/tslint-config": "^4.1.3",
-        "@0x/types": "^3.3.0",
-        "@0x/typescript-typings": "^5.1.5",
-        "@0x/utils": "^6.1.0",
-        "@0x/web3-wrapper": "^7.2.8",
+        "@0x/types": "^3.3.1",
+        "@0x/typescript-typings": "^5.1.6",
+        "@0x/utils": "^6.1.1",
+        "@0x/web3-wrapper": "^7.3.0",
         "@types/lodash": "4.14.104",
         "@types/mocha": "^5.2.7",
         "@types/node": "12.12.54",
@@ -70,7 +70,7 @@
         "chai-as-promised": "^7.1.0",
         "chai-bignumber": "^3.0.0",
         "dirty-chai": "^2.0.1",
-        "ethereum-types": "^3.3.3",
+        "ethereum-types": "^3.4.0",
         "lodash": "^4.17.11",
         "make-promises-safe": "^1.1.0",
         "mocha": "^6.2.0",
@@ -82,7 +82,7 @@
         "typescript": "3.0.1"
     },
     "dependencies": {
-        "@0x/base-contract": "^6.2.11"
+        "@0x/base-contract": "^6.2.14"
     },
     "publishConfig": {
         "access": "public"

contracts/erc721/CHANGELOG.json

@@ -1,4 +1,67 @@
 [
+    {
+        "timestamp": 1609802516,
+        "version": "3.1.21",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1608692071,
+        "version": "3.1.20",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1608245516,
+        "version": "3.1.19",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1607485227,
+        "version": "3.1.18",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1607381756,
+        "version": "3.1.17",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1606961263,
+        "version": "3.1.16",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1605763885,
+        "version": "3.1.15",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
     {
         "timestamp": 1605302002,
         "version": "3.1.14",

contracts/erc721/CHANGELOG.md

@@ -5,6 +5,34 @@ Edit the package's CHANGELOG.json file only.
 
 CHANGELOG
 
+## v3.1.21 - _January 4, 2021_
+
+    * Dependencies updated
+
+## v3.1.20 - _December 23, 2020_
+
+    * Dependencies updated
+
+## v3.1.19 - _December 17, 2020_
+
+    * Dependencies updated
+
+## v3.1.18 - _December 9, 2020_
+
+    * Dependencies updated
+
+## v3.1.17 - _December 7, 2020_
+
+    * Dependencies updated
+
+## v3.1.16 - _December 3, 2020_
+
+    * Dependencies updated
+
+## v3.1.15 - _November 19, 2020_
+
+    * Dependencies updated
+
 ## v3.1.14 - _November 13, 2020_
 
     * Dependencies updated

contracts/erc721/package.json

@@ -1,6 +1,6 @@
 {
     "name": "@0x/contracts-erc721",
-    "version": "3.1.14",
+    "version": "3.1.21",
     "engines": {
         "node": ">=6.12"
     },
@@ -52,18 +52,18 @@
     },
     "homepage": "https://github.com/0xProject/protocol/tree/main/contracts/tokens",
     "devDependencies": {
-        "@0x/abi-gen": "^5.4.7",
-        "@0x/contracts-gen": "2.0.18",
-        "@0x/contracts-test-utils": "^5.3.11",
-        "@0x/contracts-utils": "^4.5.8",
-        "@0x/dev-utils": "^4.0.1",
-        "@0x/sol-compiler": "^4.2.7",
+        "@0x/abi-gen": "^5.4.13",
+        "@0x/contracts-gen": "^2.0.24",
+        "@0x/contracts-test-utils": "^5.3.18",
+        "@0x/contracts-utils": "^4.7.0",
+        "@0x/dev-utils": "^4.1.3",
+        "@0x/sol-compiler": "^4.4.1",
         "@0x/ts-doc-gen": "^0.0.28",
         "@0x/tslint-config": "^4.1.3",
-        "@0x/types": "^3.3.0",
-        "@0x/typescript-typings": "^5.1.5",
-        "@0x/utils": "^6.1.0",
-        "@0x/web3-wrapper": "^7.2.8",
+        "@0x/types": "^3.3.1",
+        "@0x/typescript-typings": "^5.1.6",
+        "@0x/utils": "^6.1.1",
+        "@0x/web3-wrapper": "^7.3.0",
         "@types/lodash": "4.14.104",
         "@types/mocha": "^5.2.7",
         "@types/node": "12.12.54",
@@ -71,7 +71,7 @@
         "chai-as-promised": "^7.1.0",
         "chai-bignumber": "^3.0.0",
         "dirty-chai": "^2.0.1",
-        "ethereum-types": "^3.3.3",
+        "ethereum-types": "^3.4.0",
         "lodash": "^4.17.11",
         "make-promises-safe": "^1.1.0",
         "mocha": "^6.2.0",
@@ -84,7 +84,7 @@
         "typescript": "3.0.1"
     },
     "dependencies": {
-        "@0x/base-contract": "^6.2.11"
+        "@0x/base-contract": "^6.2.14"
     },
     "publishConfig": {
         "access": "public"

contracts/exchange-forwarder/CHANGELOG.json

@@ -1,4 +1,76 @@
 [
+    {
+        "timestamp": 1609802516,
+        "version": "4.2.22",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1608692071,
+        "version": "4.2.21",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1608245516,
+        "version": "4.2.20",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1608105788,
+        "version": "4.2.19",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1607485227,
+        "version": "4.2.18",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1607381756,
+        "version": "4.2.17",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1606961263,
+        "version": "4.2.16",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1605763885,
+        "version": "4.2.15",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
     {
         "timestamp": 1605302002,
         "version": "4.2.14",

contracts/exchange-forwarder/CHANGELOG.md

@@ -5,6 +5,38 @@ Edit the package's CHANGELOG.json file only.
 
 CHANGELOG
 
+## v4.2.22 - _January 4, 2021_
+
+    * Dependencies updated
+
+## v4.2.21 - _December 23, 2020_
+
+    * Dependencies updated
+
+## v4.2.20 - _December 17, 2020_
+
+    * Dependencies updated
+
+## v4.2.19 - _December 16, 2020_
+
+    * Dependencies updated
+
+## v4.2.18 - _December 9, 2020_
+
+    * Dependencies updated
+
+## v4.2.17 - _December 7, 2020_
+
+    * Dependencies updated
+
+## v4.2.16 - _December 3, 2020_
+
+    * Dependencies updated
+
+## v4.2.15 - _November 19, 2020_
+
+    * Dependencies updated
+
 ## v4.2.14 - _November 13, 2020_
 
     * Dependencies updated

contracts/exchange-forwarder/package.json

@@ -1,6 +1,6 @@
 {
     "name": "@0x/contracts-exchange-forwarder",
-    "version": "4.2.14",
+    "version": "4.2.22",
     "engines": {
         "node": ">=6.12"
     },
@@ -52,25 +52,25 @@
     },
     "homepage": "https://github.com/0xProject/protocol/tree/main/contracts/extensions",
     "devDependencies": {
-        "@0x/abi-gen": "^5.4.7",
-        "@0x/contracts-asset-proxy": "^3.6.5",
-        "@0x/contracts-dev-utils": "^1.3.12",
-        "@0x/contracts-erc1155": "^2.1.14",
-        "@0x/contracts-erc20": "^3.2.8",
-        "@0x/contracts-erc721": "^3.1.14",
-        "@0x/contracts-exchange": "^3.2.14",
-        "@0x/contracts-exchange-libs": "^4.3.14",
-        "@0x/contracts-gen": "2.0.18",
-        "@0x/contracts-test-utils": "^5.3.11",
-        "@0x/contracts-utils": "^4.5.8",
-        "@0x/dev-utils": "^4.0.1",
-        "@0x/order-utils": "^10.4.6",
-        "@0x/sol-compiler": "^4.2.7",
+        "@0x/abi-gen": "^5.4.13",
+        "@0x/contracts-asset-proxy": "^3.7.3",
+        "@0x/contracts-dev-utils": "^1.3.20",
+        "@0x/contracts-erc1155": "^2.1.21",
+        "@0x/contracts-erc20": "^3.3.0",
+        "@0x/contracts-erc721": "^3.1.21",
+        "@0x/contracts-exchange": "^3.2.22",
+        "@0x/contracts-exchange-libs": "^4.3.21",
+        "@0x/contracts-gen": "^2.0.24",
+        "@0x/contracts-test-utils": "^5.3.18",
+        "@0x/contracts-utils": "^4.7.0",
+        "@0x/dev-utils": "^4.1.3",
+        "@0x/order-utils": "^10.4.13",
+        "@0x/sol-compiler": "^4.4.1",
         "@0x/ts-doc-gen": "^0.0.28",
         "@0x/tslint-config": "^4.1.3",
-        "@0x/types": "^3.3.0",
-        "@0x/utils": "^6.1.0",
-        "@0x/web3-wrapper": "^7.2.8",
+        "@0x/types": "^3.3.1",
+        "@0x/utils": "^6.1.1",
+        "@0x/web3-wrapper": "^7.3.0",
         "@types/lodash": "4.14.104",
         "@types/mocha": "^5.2.7",
         "@types/node": "12.12.54",
@@ -90,9 +90,9 @@
         "typescript": "3.0.1"
     },
     "dependencies": {
-        "@0x/base-contract": "^6.2.11",
-        "@0x/typescript-typings": "^5.1.5",
-        "ethereum-types": "^3.3.3"
+        "@0x/base-contract": "^6.2.14",
+        "@0x/typescript-typings": "^5.1.6",
+        "ethereum-types": "^3.4.0"
     },
     "publishConfig": {
         "access": "public"

contracts/exchange-libs/CHANGELOG.json

@@ -1,4 +1,67 @@
 [
+    {
+        "timestamp": 1609802516,
+        "version": "4.3.21",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1608692071,
+        "version": "4.3.20",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1608245516,
+        "version": "4.3.19",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1607485227,
+        "version": "4.3.18",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1607381756,
+        "version": "4.3.17",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1606961263,
+        "version": "4.3.16",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1605763885,
+        "version": "4.3.15",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
     {
         "timestamp": 1605302002,
         "version": "4.3.14",

contracts/exchange-libs/CHANGELOG.md

@@ -5,6 +5,34 @@ Edit the package's CHANGELOG.json file only.
 
 CHANGELOG
 
+## v4.3.21 - _January 4, 2021_
+
+    * Dependencies updated
+
+## v4.3.20 - _December 23, 2020_
+
+    * Dependencies updated
+
+## v4.3.19 - _December 17, 2020_
+
+    * Dependencies updated
+
+## v4.3.18 - _December 9, 2020_
+
+    * Dependencies updated
+
+## v4.3.17 - _December 7, 2020_
+
+    * Dependencies updated
+
+## v4.3.16 - _December 3, 2020_
+
+    * Dependencies updated
+
+## v4.3.15 - _November 19, 2020_
+
+    * Dependencies updated
+
 ## v4.3.14 - _November 13, 2020_
 
     * Dependencies updated

contracts/exchange-libs/package.json

@@ -1,6 +1,6 @@
 {
     "name": "@0x/contracts-exchange-libs",
-    "version": "4.3.14",
+    "version": "4.3.21",
     "engines": {
         "node": ">=6.12"
     },
@@ -52,14 +52,14 @@
     },
     "homepage": "https://github.com/0xProject/protocol/tree/main/contracts/libs",
     "devDependencies": {
-        "@0x/abi-gen": "^5.4.7",
-        "@0x/contracts-gen": "2.0.18",
-        "@0x/dev-utils": "^4.0.1",
-        "@0x/sol-compiler": "^4.2.7",
-        "@0x/subproviders": "^6.1.9",
+        "@0x/abi-gen": "^5.4.13",
+        "@0x/contracts-gen": "^2.0.24",
+        "@0x/dev-utils": "^4.1.3",
+        "@0x/sol-compiler": "^4.4.1",
+        "@0x/subproviders": "^6.2.3",
         "@0x/ts-doc-gen": "^0.0.28",
         "@0x/tslint-config": "^4.1.3",
-        "@0x/web3-wrapper": "^7.2.8",
+        "@0x/web3-wrapper": "^7.3.0",
         "@types/lodash": "4.14.104",
         "@types/mocha": "^5.2.7",
         "@types/node": "12.12.54",
@@ -80,14 +80,14 @@
         "typescript": "3.0.1"
     },
     "dependencies": {
-        "@0x/base-contract": "^6.2.11",
-        "@0x/contracts-test-utils": "^5.3.11",
-        "@0x/contracts-utils": "^4.5.8",
-        "@0x/order-utils": "^10.4.6",
-        "@0x/types": "^3.3.0",
-        "@0x/typescript-typings": "^5.1.5",
-        "@0x/utils": "^6.1.0",
-        "ethereum-types": "^3.3.3"
+        "@0x/base-contract": "^6.2.14",
+        "@0x/contracts-test-utils": "^5.3.18",
+        "@0x/contracts-utils": "^4.7.0",
+        "@0x/order-utils": "^10.4.13",
+        "@0x/types": "^3.3.1",
+        "@0x/typescript-typings": "^5.1.6",
+        "@0x/utils": "^6.1.1",
+        "ethereum-types": "^3.4.0"
     },
     "publishConfig": {
         "access": "public"

contracts/exchange/CHANGELOG.json

@@ -1,4 +1,76 @@
 [
+    {
+        "timestamp": 1609802516,
+        "version": "3.2.22",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1608692071,
+        "version": "3.2.21",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1608245516,
+        "version": "3.2.20",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1608105788,
+        "version": "3.2.19",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1607485227,
+        "version": "3.2.18",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1607381756,
+        "version": "3.2.17",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1606961263,
+        "version": "3.2.16",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1605763885,
+        "version": "3.2.15",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
     {
         "timestamp": 1605302002,
         "version": "3.2.14",

contracts/exchange/CHANGELOG.md

@@ -5,6 +5,38 @@ Edit the package's CHANGELOG.json file only.
 
 CHANGELOG
 
+## v3.2.22 - _January 4, 2021_
+
+    * Dependencies updated
+
+## v3.2.21 - _December 23, 2020_
+
+    * Dependencies updated
+
+## v3.2.20 - _December 17, 2020_
+
+    * Dependencies updated
+
+## v3.2.19 - _December 16, 2020_
+
+    * Dependencies updated
+
+## v3.2.18 - _December 9, 2020_
+
+    * Dependencies updated
+
+## v3.2.17 - _December 7, 2020_
+
+    * Dependencies updated
+
+## v3.2.16 - _December 3, 2020_
+
+    * Dependencies updated
+
+## v3.2.15 - _November 19, 2020_
+
+    * Dependencies updated
+
 ## v3.2.14 - _November 13, 2020_
 
     * Dependencies updated

contracts/exchange/package.json

@@ -1,6 +1,6 @@
 {
     "name": "@0x/contracts-exchange",
-    "version": "3.2.14",
+    "version": "3.2.22",
     "engines": {
         "node": ">=6.12"
     },
@@ -52,21 +52,21 @@
     },
     "homepage": "https://github.com/0xProject/protocol/tree/main/contracts/protocol",
     "devDependencies": {
-        "@0x/abi-gen": "^5.4.7",
-        "@0x/contracts-asset-proxy": "^3.6.5",
-        "@0x/contracts-exchange-libs": "^4.3.14",
-        "@0x/contracts-gen": "2.0.18",
-        "@0x/contracts-multisig": "^4.1.14",
-        "@0x/contracts-staking": "^2.0.21",
-        "@0x/contracts-test-utils": "^5.3.11",
-        "@0x/contracts-utils": "^4.5.8",
-        "@0x/dev-utils": "^4.0.1",
-        "@0x/sol-compiler": "^4.2.7",
+        "@0x/abi-gen": "^5.4.13",
+        "@0x/contracts-asset-proxy": "^3.7.3",
+        "@0x/contracts-exchange-libs": "^4.3.21",
+        "@0x/contracts-gen": "^2.0.24",
+        "@0x/contracts-multisig": "^4.1.22",
+        "@0x/contracts-staking": "^2.0.29",
+        "@0x/contracts-test-utils": "^5.3.18",
+        "@0x/contracts-utils": "^4.7.0",
+        "@0x/dev-utils": "^4.1.3",
+        "@0x/sol-compiler": "^4.4.1",
         "@0x/ts-doc-gen": "^0.0.28",
         "@0x/tslint-config": "^4.1.3",
-        "@0x/types": "^3.3.0",
-        "@0x/typescript-typings": "^5.1.5",
-        "@0x/web3-wrapper": "^7.2.8",
+        "@0x/types": "^3.3.1",
+        "@0x/typescript-typings": "^5.1.6",
+        "@0x/web3-wrapper": "^7.3.0",
         "@types/lodash": "4.14.104",
         "@types/mocha": "^5.2.7",
         "@types/node": "12.12.54",
@@ -74,7 +74,7 @@
         "chai-as-promised": "^7.1.0",
         "chai-bignumber": "^3.0.0",
         "dirty-chai": "^2.0.1",
-        "ethereum-types": "^3.3.3",
+        "ethereum-types": "^3.4.0",
         "ethereumjs-util": "^5.1.1",
         "js-combinatorics": "^0.5.3",
         "make-promises-safe": "^1.1.0",
@@ -88,13 +88,13 @@
         "typescript": "3.0.1"
     },
     "dependencies": {
-        "@0x/base-contract": "^6.2.11",
-        "@0x/contracts-dev-utils": "^1.3.12",
-        "@0x/contracts-erc1155": "^2.1.14",
-        "@0x/contracts-erc20": "^3.2.8",
-        "@0x/contracts-erc721": "^3.1.14",
-        "@0x/order-utils": "^10.4.6",
-        "@0x/utils": "^6.1.0",
+        "@0x/base-contract": "^6.2.14",
+        "@0x/contracts-dev-utils": "^1.3.20",
+        "@0x/contracts-erc1155": "^2.1.21",
+        "@0x/contracts-erc20": "^3.3.0",
+        "@0x/contracts-erc721": "^3.1.21",
+        "@0x/order-utils": "^10.4.13",
+        "@0x/utils": "^6.1.1",
         "lodash": "^4.17.11"
     },
     "publishConfig": {

contracts/extensions/CHANGELOG.json

@@ -1,4 +1,76 @@
 [
+    {
+        "timestamp": 1609802516,
+        "version": "6.2.16",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1608692071,
+        "version": "6.2.15",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1608245516,
+        "version": "6.2.14",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1608105788,
+        "version": "6.2.13",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1607485227,
+        "version": "6.2.12",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1607381756,
+        "version": "6.2.11",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1606961263,
+        "version": "6.2.10",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1605763885,
+        "version": "6.2.9",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
     {
         "timestamp": 1605302002,
         "version": "6.2.8",

contracts/extensions/CHANGELOG.md

@@ -5,6 +5,38 @@ Edit the package's CHANGELOG.json file only.
 
 CHANGELOG
 
+## v6.2.16 - _January 4, 2021_
+
+    * Dependencies updated
+
+## v6.2.15 - _December 23, 2020_
+
+    * Dependencies updated
+
+## v6.2.14 - _December 17, 2020_
+
+    * Dependencies updated
+
+## v6.2.13 - _December 16, 2020_
+
+    * Dependencies updated
+
+## v6.2.12 - _December 9, 2020_
+
+    * Dependencies updated
+
+## v6.2.11 - _December 7, 2020_
+
+    * Dependencies updated
+
+## v6.2.10 - _December 3, 2020_
+
+    * Dependencies updated
+
+## v6.2.9 - _November 19, 2020_
+
+    * Dependencies updated
+
 ## v6.2.8 - _November 13, 2020_
 
     * Dependencies updated

contracts/extensions/package.json

@@ -1,6 +1,6 @@
 {
     "name": "@0x/contracts-extensions",
-    "version": "6.2.8",
+    "version": "6.2.16",
     "engines": {
         "node": ">=6.12"
     },
@@ -52,23 +52,23 @@
     },
     "homepage": "https://github.com/0xProject/protocol/tree/main/contracts/extensions",
     "devDependencies": {
-        "@0x/abi-gen": "^5.4.7",
-        "@0x/contracts-asset-proxy": "^3.6.5",
-        "@0x/contracts-dev-utils": "^1.3.12",
-        "@0x/contracts-erc20": "^3.2.8",
-        "@0x/contracts-erc721": "^3.1.14",
-        "@0x/contracts-exchange": "^3.2.14",
-        "@0x/contracts-exchange-libs": "^4.3.14",
-        "@0x/contracts-gen": "2.0.18",
-        "@0x/contracts-utils": "^4.5.8",
-        "@0x/dev-utils": "^4.0.1",
-        "@0x/order-utils": "^10.4.6",
-        "@0x/sol-compiler": "^4.2.7",
+        "@0x/abi-gen": "^5.4.13",
+        "@0x/contracts-asset-proxy": "^3.7.3",
+        "@0x/contracts-dev-utils": "^1.3.20",
+        "@0x/contracts-erc20": "^3.3.0",
+        "@0x/contracts-erc721": "^3.1.21",
+        "@0x/contracts-exchange": "^3.2.22",
+        "@0x/contracts-exchange-libs": "^4.3.21",
+        "@0x/contracts-gen": "^2.0.24",
+        "@0x/contracts-utils": "^4.7.0",
+        "@0x/dev-utils": "^4.1.3",
+        "@0x/order-utils": "^10.4.13",
+        "@0x/sol-compiler": "^4.4.1",
         "@0x/ts-doc-gen": "^0.0.28",
         "@0x/tslint-config": "^4.1.3",
-        "@0x/types": "^3.3.0",
-        "@0x/utils": "^6.1.0",
-        "@0x/web3-wrapper": "^7.2.8",
+        "@0x/types": "^3.3.1",
+        "@0x/utils": "^6.1.1",
+        "@0x/web3-wrapper": "^7.3.0",
         "@types/lodash": "4.14.104",
         "@types/mocha": "^5.2.7",
         "@types/node": "12.12.54",
@@ -90,10 +90,10 @@
         "typescript": "3.0.1"
     },
     "dependencies": {
-        "@0x/base-contract": "^6.2.11",
-        "@0x/contracts-test-utils": "^5.3.11",
-        "@0x/typescript-typings": "^5.1.5",
-        "ethereum-types": "^3.3.3"
+        "@0x/base-contract": "^6.2.14",
+        "@0x/contracts-test-utils": "^5.3.18",
+        "@0x/typescript-typings": "^5.1.6",
+        "ethereum-types": "^3.4.0"
     },
     "publishConfig": {
         "access": "public"

contracts/integrations/CHANGELOG.json

@@ -1,4 +1,22 @@
 [
+    {
+        "timestamp": 1605763885,
+        "version": "2.7.10",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1605320370,
+        "version": "2.7.9",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
     {
         "timestamp": 1605302002,
         "version": "2.7.8",

contracts/integrations/CHANGELOG.md

@@ -5,6 +5,14 @@ Edit the package's CHANGELOG.json file only.
 
 CHANGELOG
 
+## v2.7.10 - _November 19, 2020_
+
+    * Dependencies updated
+
+## v2.7.9 - _November 14, 2020_
+
+    * Dependencies updated
+
 ## v2.7.8 - _November 13, 2020_
 
     * Dependencies updated

contracts/integrations/contracts/test/TestFixinProtocolFeesIntegration.sol

@@ -0,0 +1,39 @@
+/*
+
+  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-zero-ex/contracts/test/TestFixinProtocolFees.sol";
+import "@0x/contracts-zero-ex/contracts/src/external/FeeCollectorController.sol";
+
+
+contract TestFixinProtocolFeesIntegration is TestFixinProtocolFees {
+    constructor(
+        IEtherTokenV06 weth,
+        IStaking staking,
+        uint32 protocolFeeMultiplier
+    )
+        public
+        TestFixinProtocolFees(
+            weth,
+            staking,
+            new FeeCollectorController(weth, staking),
+            protocolFeeMultiplier
+        )
+    {}
+}

contracts/integrations/contracts/test/TestStaking.sol

@@ -0,0 +1,110 @@
+/*
+
+  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-staking/contracts/src/Staking.sol";
+
+
+contract TestStaking is
+    Staking
+{
+    IEtherToken public testWeth;
+
+    struct TestPool {
+        uint96 operatorStake;
+        uint96 membersStake;
+    }
+
+    mapping(bytes32 => TestPool) private _testPools;
+
+    constructor(address exchangeAddress, IEtherToken _testWeth) public {
+        testWeth = _testWeth;
+
+        _addAuthorizedAddress(msg.sender);
+        init();
+        validExchanges[exchangeAddress] = true;
+        _removeAuthorizedAddressAtIndex(msg.sender, 0);
+    }
+
+    function advanceEpoch()
+        external
+    {
+        currentEpoch += 1;
+    }
+
+    /// @dev Create a test pool.
+    function createTestPool(
+        bytes32 poolId,
+        uint96 operatorStake,
+        uint96 membersStake
+    )
+        external
+    {
+        TestPool storage pool = _testPools[poolId];
+        pool.operatorStake = operatorStake;
+        pool.membersStake = membersStake;
+    }
+
+    function getAggregatedStatsForCurrentEpoch()
+        external
+        view
+        returns (IStructs.AggregatedStats memory)
+    {
+        return aggregatedStatsByEpoch[currentEpoch];
+    }
+
+    /// @dev Overridden to use test pools.
+    function getTotalStakeDelegatedToPool(bytes32 poolId)
+        public
+        view
+        returns (IStructs.StoredBalance memory balance)
+    {
+        TestPool memory pool = _testPools[poolId];
+        uint96 stake = pool.operatorStake + pool.membersStake;
+        return IStructs.StoredBalance({
+            currentEpoch: currentEpoch.downcastToUint64(),
+            currentEpochBalance: stake,
+            nextEpochBalance: stake
+        });
+    }
+
+    /// @dev Overridden to use test pools.
+    function getStakeDelegatedToPoolByOwner(address, bytes32 poolId)
+        public
+        view
+        returns (IStructs.StoredBalance memory balance)
+    {
+        TestPool memory pool = _testPools[poolId];
+        return IStructs.StoredBalance({
+            currentEpoch: currentEpoch.downcastToUint64(),
+            currentEpochBalance: pool.operatorStake,
+            nextEpochBalance: pool.operatorStake
+        });
+    }
+
+    function getWethContract()
+        public
+        view
+        returns (IEtherToken wethContract)
+    {
+        return testWeth;
+    }
+}
+

contracts/integrations/contracts/test/TestWethIntegration.sol

@@ -0,0 +1,24 @@
+/*
+
+  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-zero-ex/contracts/test/TestWeth.sol";
+
+
+contract TestWethIntegration is TestWeth {}

contracts/integrations/package.json

@@ -1,6 +1,7 @@
 {
     "name": "@0x/contracts-integrations",
-    "version": "2.7.8",
+    "version": "2.7.22",
+    "private": true,
     "engines": {
         "node": ">=6.12"
     },
@@ -38,7 +39,7 @@
     },
     "config": {
         "publicInterfaceContracts": "TestFramework",
-        "abis": "./test/generated-artifacts/@(ChainlinkStopLimit|IChainlinkAggregator|TestChainlinkAggregator|TestContractWrapper|TestDydxUser|TestEth2Dai|TestEth2DaiBridge|TestFramework|TestMainnetAggregatorFills|TestSignatureValidationWallet|TestUniswapBridge|TestUniswapExchange|TestUniswapExchangeFactory).json",
+        "abis": "./test/generated-artifacts/@(ChainlinkStopLimit|IChainlinkAggregator|TestChainlinkAggregator|TestContractWrapper|TestDydxUser|TestEth2Dai|TestEth2DaiBridge|TestFixinProtocolFeesIntegration|TestFramework|TestMainnetAggregatorFills|TestSignatureValidationWallet|TestStaking|TestUniswapBridge|TestUniswapExchange|TestUniswapExchangeFactory|TestWethIntegration).json",
         "abis:comment": "This list is auto-generated by contracts-gen. Don't edit manually."
     },
     "repository": {
@@ -51,24 +52,25 @@
     },
     "homepage": "https://github.com/0xProject/protocol/tree/main/contracts/extensions",
     "devDependencies": {
-        "@0x/abi-gen": "^5.4.7",
-        "@0x/contract-addresses": "^5.3.0",
-        "@0x/contract-wrappers": "^13.10.0",
-        "@0x/contracts-broker": "^1.1.13",
-        "@0x/contracts-coordinator": "^3.1.14",
-        "@0x/contracts-dev-utils": "^1.3.12",
-        "@0x/contracts-exchange-forwarder": "^4.2.14",
-        "@0x/contracts-exchange-libs": "^4.3.14",
-        "@0x/contracts-extensions": "^6.2.8",
-        "@0x/contracts-gen": "2.0.18",
-        "@0x/contracts-utils": "^4.5.8",
+        "@0x/abi-gen": "^5.4.13",
+        "@0x/contract-addresses": "^5.8.0",
+        "@0x/contract-wrappers": "^13.12.0",
+        "@0x/contracts-broker": "^1.1.21",
+        "@0x/contracts-coordinator": "^3.1.22",
+        "@0x/contracts-dev-utils": "^1.3.20",
+        "@0x/contracts-exchange-forwarder": "^4.2.22",
+        "@0x/contracts-exchange-libs": "^4.3.21",
+        "@0x/contracts-extensions": "^6.2.16",
+        "@0x/contracts-gen": "^2.0.24",
+        "@0x/contracts-utils": "^4.7.0",
         "@0x/coordinator-server": "^1.0.5",
-        "@0x/dev-utils": "^4.0.1",
-        "@0x/migrations": "^6.5.0",
-        "@0x/order-utils": "^10.4.6",
-        "@0x/sol-compiler": "^4.2.7",
+        "@0x/dev-utils": "^4.1.3",
+        "@0x/migrations": "^6.5.9",
+        "@0x/order-utils": "^10.4.13",
+        "@0x/protocol-utils": "^1.1.3",
+        "@0x/sol-compiler": "^4.4.1",
         "@0x/tslint-config": "^4.1.3",
-        "@0x/web3-wrapper": "^7.2.8",
+        "@0x/web3-wrapper": "^7.3.0",
         "@azure/core-asynciterator-polyfill": "^1.0.0",
         "@types/lodash": "4.14.104",
         "@types/mocha": "^5.2.7",
@@ -91,22 +93,22 @@
         "typescript": "3.0.1"
     },
     "dependencies": {
-        "@0x/asset-swapper": "^5.1.0",
-        "@0x/base-contract": "^6.2.11",
-        "@0x/contracts-asset-proxy": "^3.6.5",
-        "@0x/contracts-erc1155": "^2.1.14",
-        "@0x/contracts-erc20": "^3.2.8",
-        "@0x/contracts-erc721": "^3.1.14",
-        "@0x/contracts-exchange": "^3.2.14",
-        "@0x/contracts-multisig": "^4.1.14",
-        "@0x/contracts-staking": "^2.0.21",
-        "@0x/contracts-test-utils": "^5.3.11",
-        "@0x/contracts-zero-ex": "^0.9.0",
-        "@0x/subproviders": "^6.1.9",
-        "@0x/types": "^3.3.0",
-        "@0x/typescript-typings": "^5.1.5",
-        "@0x/utils": "^6.1.0",
-        "ethereum-types": "^3.3.3",
+        "@0x/asset-swapper": "^5.6.2",
+        "@0x/base-contract": "^6.2.14",
+        "@0x/contracts-asset-proxy": "^3.7.3",
+        "@0x/contracts-erc1155": "^2.1.21",
+        "@0x/contracts-erc20": "^3.3.0",
+        "@0x/contracts-erc721": "^3.1.21",
+        "@0x/contracts-exchange": "^3.2.22",
+        "@0x/contracts-multisig": "^4.1.22",
+        "@0x/contracts-staking": "^2.0.29",
+        "@0x/contracts-test-utils": "^5.3.18",
+        "@0x/contracts-zero-ex": "^0.17.0",
+        "@0x/subproviders": "^6.2.3",
+        "@0x/types": "^3.3.1",
+        "@0x/typescript-typings": "^5.1.6",
+        "@0x/utils": "^6.1.1",
+        "ethereum-types": "^3.4.0",
         "ethereumjs-util": "^6.2.0",
         "lodash": "^4.17.11"
     },

contracts/integrations/test/artifacts.ts

@@ -12,12 +12,15 @@ import * as TestContractWrapper from '../test/generated-artifacts/TestContractWr
 import * as TestDydxUser from '../test/generated-artifacts/TestDydxUser.json';
 import * as TestEth2Dai from '../test/generated-artifacts/TestEth2Dai.json';
 import * as TestEth2DaiBridge from '../test/generated-artifacts/TestEth2DaiBridge.json';
+import * as TestFixinProtocolFeesIntegration from '../test/generated-artifacts/TestFixinProtocolFeesIntegration.json';
 import * as TestFramework from '../test/generated-artifacts/TestFramework.json';
 import * as TestMainnetAggregatorFills from '../test/generated-artifacts/TestMainnetAggregatorFills.json';
 import * as TestSignatureValidationWallet from '../test/generated-artifacts/TestSignatureValidationWallet.json';
+import * as TestStaking from '../test/generated-artifacts/TestStaking.json';
 import * as TestUniswapBridge from '../test/generated-artifacts/TestUniswapBridge.json';
 import * as TestUniswapExchange from '../test/generated-artifacts/TestUniswapExchange.json';
 import * as TestUniswapExchangeFactory from '../test/generated-artifacts/TestUniswapExchangeFactory.json';
+import * as TestWethIntegration from '../test/generated-artifacts/TestWethIntegration.json';
 export const artifacts = {
     ChainlinkStopLimit: ChainlinkStopLimit as ContractArtifact,
     IChainlinkAggregator: IChainlinkAggregator as ContractArtifact,
@@ -26,10 +29,13 @@ export const artifacts = {
     TestDydxUser: TestDydxUser as ContractArtifact,
     TestEth2Dai: TestEth2Dai as ContractArtifact,
     TestEth2DaiBridge: TestEth2DaiBridge as ContractArtifact,
+    TestFixinProtocolFeesIntegration: TestFixinProtocolFeesIntegration as ContractArtifact,
     TestFramework: TestFramework as ContractArtifact,
     TestMainnetAggregatorFills: TestMainnetAggregatorFills as ContractArtifact,
     TestSignatureValidationWallet: TestSignatureValidationWallet as ContractArtifact,
+    TestStaking: TestStaking as ContractArtifact,
     TestUniswapBridge: TestUniswapBridge as ContractArtifact,
     TestUniswapExchange: TestUniswapExchange as ContractArtifact,
     TestUniswapExchangeFactory: TestUniswapExchangeFactory as ContractArtifact,
+    TestWethIntegration: TestWethIntegration as ContractArtifact,
 };

contracts/integrations/test/exchange-proxy/mtx_test.ts

@@ -6,24 +6,31 @@ import {
     artifacts as exchangeProxyArtifacts,
     IZeroExContract,
     LogMetadataTransformerContract,
-    signCallData,
 } from '@0x/contracts-zero-ex';
 import { migrateOnceAsync } from '@0x/migrations';
+import { assetDataUtils, signatureUtils, SignedExchangeProxyMetaTransaction } from '@0x/order-utils';
 import {
-    assetDataUtils,
     encodeFillQuoteTransformerData,
     encodePayTakerTransformerData,
     ETH_TOKEN_ADDRESS,
     FillQuoteTransformerSide,
     findTransformerNonce,
-    signatureUtils,
-    SignedExchangeProxyMetaTransaction,
-} from '@0x/order-utils';
+    Signature,
+} from '@0x/protocol-utils';
 import { AssetProxyId, Order, SignedOrder } from '@0x/types';
-import { BigNumber, hexUtils, ZeroExRevertErrors } from '@0x/utils';
+import { BigNumber, hexUtils } from '@0x/utils';
 import * as ethjs from 'ethereumjs-util';
 
-const { MAX_UINT256, NULL_ADDRESS, NULL_BYTES, NULL_BYTES32, ZERO_AMOUNT } = constants;
+const { MAX_UINT256, NULL_ADDRESS, NULL_BYTES, ZERO_AMOUNT } = constants;
+
+function sigstruct(signature: string): Signature {
+    return {
+        v: parseInt(hexUtils.slice(signature, 0, 1), 16),
+        signatureType: parseInt(hexUtils.slice(signature, 65, 66), 16),
+        r: hexUtils.slice(signature, 1, 33),
+        s: hexUtils.slice(signature, 33, 65),
+    };
+}
 
 blockchainTests.resets('exchange proxy - meta-transactions', env => {
     const quoteSignerKey = hexUtils.random();
@@ -188,21 +195,6 @@ blockchainTests.resets('exchange proxy - meta-transactions', env => {
             .getABIEncodedTransactionData();
     }
 
-    function getSignedSwapData(swap: SwapInfo, signerKey?: string): string {
-        return signCallData(
-            zeroEx
-                .transformERC20(
-                    swap.inputTokenAddress,
-                    swap.outputTokenAddress,
-                    swap.inputTokenAmount,
-                    swap.minOutputTokenAmount,
-                    swap.transformations,
-                )
-                .getABIEncodedTransactionData(),
-            signerKey ? signerKey : quoteSignerKey,
-        );
-    }
-
     async function createMetaTransactionAsync(
         data: string,
         value: BigNumber,
@@ -232,15 +224,13 @@ blockchainTests.resets('exchange proxy - meta-transactions', env => {
         );
     }
 
-    it('can call `transformERC20()` with signed calldata and no relayer fee', async () => {
+    it('can call `transformERC20()` with calldata and no relayer fee', async () => {
         const swap = await generateSwapAsync();
-        const callDataHash = hexUtils.hash(getSwapData(swap));
-        const signedSwapData = getSignedSwapData(swap);
         const _protocolFee = protocolFee.times(GAS_PRICE).times(swap.orders.length + 1); // Pay a little more fee than needed.
-        const mtx = await createMetaTransactionAsync(signedSwapData, _protocolFee, 0);
+        const mtx = await createMetaTransactionAsync(getSwapData(swap), _protocolFee, 0);
         const relayerEthBalanceBefore = await env.web3Wrapper.getBalanceInWeiAsync(relayer);
         const receipt = await zeroEx
-            .executeMetaTransaction(mtx, mtx.signature)
+            .executeMetaTransaction(mtx, sigstruct(mtx.signature))
             .awaitTransactionSuccessAsync({ from: relayer, value: mtx.value, gasPrice: GAS_PRICE });
         const relayerEthRefund = relayerEthBalanceBefore
             .minus(await env.web3Wrapper.getBalanceInWeiAsync(relayer))
@@ -259,7 +249,6 @@ blockchainTests.resets('exchange proxy - meta-transactions', env => {
             [
                 {
                     taker,
-                    callDataHash,
                     sender: zeroEx.address,
                     data: NULL_BYTES,
                 },
@@ -268,15 +257,13 @@ blockchainTests.resets('exchange proxy - meta-transactions', env => {
         );
     });
 
-    it('can call `transformERC20()` with signed calldata and a relayer fee', async () => {
+    it('can call `transformERC20()` with calldata and a relayer fee', async () => {
         const swap = await generateSwapAsync();
-        const callDataHash = hexUtils.hash(getSwapData(swap));
-        const signedSwapData = getSignedSwapData(swap);
         const _protocolFee = protocolFee.times(GAS_PRICE).times(swap.orders.length + 1); // Pay a little more fee than needed.
-        const mtx = await createMetaTransactionAsync(signedSwapData, _protocolFee);
+        const mtx = await createMetaTransactionAsync(getSwapData(swap), _protocolFee);
         const relayerEthBalanceBefore = await env.web3Wrapper.getBalanceInWeiAsync(relayer);
         const receipt = await zeroEx
-            .executeMetaTransaction(mtx, mtx.signature)
+            .executeMetaTransaction(mtx, sigstruct(mtx.signature))
             .awaitTransactionSuccessAsync({ from: relayer, value: mtx.value, gasPrice: GAS_PRICE });
         const relayerEthRefund = relayerEthBalanceBefore
             .minus(await env.web3Wrapper.getBalanceInWeiAsync(relayer))
@@ -295,7 +282,6 @@ blockchainTests.resets('exchange proxy - meta-transactions', env => {
             [
                 {
                     taker,
-                    callDataHash,
                     sender: zeroEx.address,
                     data: NULL_BYTES,
                 },
@@ -304,51 +290,13 @@ blockchainTests.resets('exchange proxy - meta-transactions', env => {
         );
     });
 
-    it('can call `transformERC20()` with wrongly signed calldata and a relayer fee', async () => {
-        const swap = await generateSwapAsync();
-        const signedSwapData = getSignedSwapData(swap, hexUtils.random());
-        const _protocolFee = protocolFee.times(GAS_PRICE).times(swap.orders.length + 1); // Pay a little more fee than needed.
-        const mtx = await createMetaTransactionAsync(signedSwapData, _protocolFee);
-        const relayerEthBalanceBefore = await env.web3Wrapper.getBalanceInWeiAsync(relayer);
-        const receipt = await zeroEx
-            .executeMetaTransaction(mtx, mtx.signature)
-            .awaitTransactionSuccessAsync({ from: relayer, value: mtx.value, gasPrice: GAS_PRICE });
-        const relayerEthRefund = relayerEthBalanceBefore
-            .minus(await env.web3Wrapper.getBalanceInWeiAsync(relayer))
-            .minus(GAS_PRICE.times(receipt.gasUsed));
-        // Ensure the relayer got back the unused protocol fees.
-        expect(relayerEthRefund).to.bignumber.eq(protocolFee.times(GAS_PRICE));
-        // Ensure the relayer got paid mtx fees.
-        expect(await feeToken.balanceOf(relayer).callAsync()).to.bignumber.eq(mtx.feeAmount);
-        // Ensure the taker got output tokens.
-        expect(await outputToken.balanceOf(taker).callAsync()).to.bignumber.eq(swap.minOutputTokenAmount);
-        // Ensure the maker got input tokens.
-        expect(await inputToken.balanceOf(maker).callAsync()).to.bignumber.eq(swap.inputTokenAmount);
-        // Check events.
-        verifyEventsFromLogs(
-            receipt.logs,
-            [
-                {
-                    taker,
-                    // Only signed calldata should have a nonzero hash.
-                    callDataHash: NULL_BYTES32,
-                    sender: zeroEx.address,
-                    data: NULL_BYTES,
-                },
-            ],
-            'TransformerMetadata',
-        );
-    });
-
-    it('`transformERC20()` can fill RFQT order if calldata is signed', async () => {
+    it('`transformERC20()` can fill RFQT order', async () => {
         const swap = await generateSwapAsync({}, true);
-        const callDataHash = hexUtils.hash(getSwapData(swap));
-        const signedSwapData = getSignedSwapData(swap);
         const _protocolFee = protocolFee.times(GAS_PRICE).times(swap.orders.length + 1); // Pay a little more fee than needed.
-        const mtx = await createMetaTransactionAsync(signedSwapData, _protocolFee, 0);
+        const mtx = await createMetaTransactionAsync(getSwapData(swap), _protocolFee, 0);
         const relayerEthBalanceBefore = await env.web3Wrapper.getBalanceInWeiAsync(relayer);
         const receipt = await zeroEx
-            .executeMetaTransaction(mtx, mtx.signature)
+            .executeMetaTransaction(mtx, sigstruct(mtx.signature))
             .awaitTransactionSuccessAsync({ from: relayer, value: mtx.value, gasPrice: GAS_PRICE });
         const relayerEthRefund = relayerEthBalanceBefore
             .minus(await env.web3Wrapper.getBalanceInWeiAsync(relayer))
@@ -367,7 +315,6 @@ blockchainTests.resets('exchange proxy - meta-transactions', env => {
             [
                 {
                     taker,
-                    callDataHash,
                     sender: zeroEx.address,
                     data: NULL_BYTES,
                 },
@@ -376,16 +323,15 @@ blockchainTests.resets('exchange proxy - meta-transactions', env => {
         );
     });
 
-    it('`transformERC20()` can fill RFQT order if calldata is not signed but no quote signer configured', async () => {
+    it('`transformERC20()` can fill RFQT order if quote signer configured', async () => {
         const swap = await generateSwapAsync({}, true);
         const callData = getSwapData(swap);
-        const callDataHash = hexUtils.hash(callData);
         const _protocolFee = protocolFee.times(GAS_PRICE).times(swap.orders.length + 1); // Pay a little more fee than needed.
         const mtx = await createMetaTransactionAsync(callData, _protocolFee, 0);
         const relayerEthBalanceBefore = await env.web3Wrapper.getBalanceInWeiAsync(relayer);
         await zeroEx.setQuoteSigner(NULL_ADDRESS).awaitTransactionSuccessAsync({ from: owner });
         const receipt = await zeroEx
-            .executeMetaTransaction(mtx, mtx.signature)
+            .executeMetaTransaction(mtx, sigstruct(mtx.signature))
             .awaitTransactionSuccessAsync({ from: relayer, value: mtx.value, gasPrice: GAS_PRICE });
         const relayerEthRefund = relayerEthBalanceBefore
             .minus(await env.web3Wrapper.getBalanceInWeiAsync(relayer))
@@ -404,7 +350,6 @@ blockchainTests.resets('exchange proxy - meta-transactions', env => {
             [
                 {
                     taker,
-                    callDataHash,
                     sender: zeroEx.address,
                     data: NULL_BYTES,
                 },
@@ -412,15 +357,4 @@ blockchainTests.resets('exchange proxy - meta-transactions', env => {
             'TransformerMetadata',
         );
     });
-
-    it('`transformERC20()` cannot fill RFQT order if calldata is not signed', async () => {
-        const swap = await generateSwapAsync({}, true);
-        const callData = getSwapData(swap);
-        const _protocolFee = protocolFee.times(GAS_PRICE).times(swap.orders.length + 1); // Pay a little more fee than needed.
-        const mtx = await createMetaTransactionAsync(callData, _protocolFee, 0);
-        const tx = zeroEx
-            .executeMetaTransaction(mtx, mtx.signature)
-            .awaitTransactionSuccessAsync({ from: relayer, value: mtx.value, gasPrice: GAS_PRICE });
-        return expect(tx).to.revertWith(new ZeroExRevertErrors.MetaTransactions.MetaTransactionCallFailedError());
-    });
 });

contracts/integrations/test/wrappers.ts

@@ -10,9 +10,12 @@ export * from '../test/generated-wrappers/test_contract_wrapper';
 export * from '../test/generated-wrappers/test_dydx_user';
 export * from '../test/generated-wrappers/test_eth2_dai';
 export * from '../test/generated-wrappers/test_eth2_dai_bridge';
+export * from '../test/generated-wrappers/test_fixin_protocol_fees_integration';
 export * from '../test/generated-wrappers/test_framework';
 export * from '../test/generated-wrappers/test_mainnet_aggregator_fills';
 export * from '../test/generated-wrappers/test_signature_validation_wallet';
+export * from '../test/generated-wrappers/test_staking';
 export * from '../test/generated-wrappers/test_uniswap_bridge';
 export * from '../test/generated-wrappers/test_uniswap_exchange';
 export * from '../test/generated-wrappers/test_uniswap_exchange_factory';
+export * from '../test/generated-wrappers/test_weth_integration';

contracts/integrations/test/zero-ex/protocol_fees_staking_test.ts

@@ -0,0 +1,85 @@
+import { blockchainTests, constants, expect } from '@0x/contracts-test-utils';
+import { BigNumber, hexUtils } from '@0x/utils';
+
+import { artifacts } from '../artifacts';
+import {
+    TestFixinProtocolFeesIntegrationContract,
+    TestStakingContract,
+    TestWethIntegrationContract,
+} from '../wrappers';
+
+blockchainTests.resets('ProtocolFeeIntegration', env => {
+    const FEE_MULTIPLIER = 70e3;
+    let owner: string;
+    let taker: string;
+    let protocolFees: TestFixinProtocolFeesIntegrationContract;
+    let staking: TestStakingContract;
+    let weth: TestWethIntegrationContract;
+    let singleFeeAmount: BigNumber;
+
+    before(async () => {
+        [owner, taker] = await env.getAccountAddressesAsync();
+        weth = await TestWethIntegrationContract.deployFrom0xArtifactAsync(
+            artifacts.TestWethIntegration,
+            env.provider,
+            env.txDefaults,
+            artifacts,
+        );
+        staking = await TestStakingContract.deployFrom0xArtifactAsync(
+            artifacts.TestStaking,
+            env.provider,
+            env.txDefaults,
+            artifacts,
+            constants.NULL_ADDRESS, // exchange address, which we don't know yet
+            weth.address,
+        );
+        protocolFees = await TestFixinProtocolFeesIntegrationContract.deployFrom0xArtifactAsync(
+            artifacts.TestFixinProtocolFeesIntegration,
+            env.provider,
+            { ...env.txDefaults, from: taker },
+            artifacts,
+            weth.address,
+            staking.address,
+            FEE_MULTIPLIER,
+        );
+        await staking.addAuthorizedAddress(owner).awaitTransactionSuccessAsync();
+        await staking.addExchangeAddress(protocolFees.address).awaitTransactionSuccessAsync({ from: owner });
+        await weth.mint(taker, constants.ONE_ETHER).awaitTransactionSuccessAsync();
+        await weth.approve(protocolFees.address, constants.ONE_ETHER).awaitTransactionSuccessAsync({ from: taker });
+
+        singleFeeAmount = await protocolFees.getSingleProtocolFee().callAsync();
+    });
+
+    describe('fee collection integration', () => {
+        const pool0 = constants.NULL_BYTES32;
+        const poolId = hexUtils.random();
+
+        it('should collect fees for pool 0', async () => {
+            await protocolFees.collectProtocolFee(pool0).awaitTransactionSuccessAsync({ value: singleFeeAmount });
+            await protocolFees.transferFeesForPool(pool0).awaitTransactionSuccessAsync();
+
+            // Fees in the pool bytes32(0) don't get attributed to a pool.
+            await expect(
+                (await staking.getStakingPoolStatsThisEpoch(pool0).callAsync()).feesCollected,
+            ).to.bignumber.equal(constants.ZERO_AMOUNT);
+
+            // Expected amount is singleFeeAmount - 1 because we leave 1 wei of WETH behind for future gas savings.
+            return expect(await weth.balanceOf(staking.address).callAsync()).to.bignumber.equal(
+                singleFeeAmount.minus(1),
+            );
+        });
+
+        it('should collect fees for non-zero pool', async () => {
+            const eth100 = constants.ONE_ETHER.multipliedBy(100);
+            await staking.createTestPool(poolId, eth100, eth100).awaitTransactionSuccessAsync();
+
+            await protocolFees.collectProtocolFee(poolId).awaitTransactionSuccessAsync({ value: singleFeeAmount });
+            await protocolFees.transferFeesForPool(poolId).awaitTransactionSuccessAsync();
+
+            // Expected amount is singleFeeAmount - 1 because we leave 1 wei of WETH behind for future gas savings.
+            return expect(
+                (await staking.getStakingPoolStatsThisEpoch(poolId).callAsync()).feesCollected,
+            ).to.bignumber.equal(singleFeeAmount.minus(1));
+        });
+    });
+});

contracts/integrations/tsconfig.json

@@ -11,11 +11,14 @@
         "test/generated-artifacts/TestDydxUser.json",
         "test/generated-artifacts/TestEth2Dai.json",
         "test/generated-artifacts/TestEth2DaiBridge.json",
+        "test/generated-artifacts/TestFixinProtocolFeesIntegration.json",
         "test/generated-artifacts/TestFramework.json",
         "test/generated-artifacts/TestMainnetAggregatorFills.json",
         "test/generated-artifacts/TestSignatureValidationWallet.json",
+        "test/generated-artifacts/TestStaking.json",
         "test/generated-artifacts/TestUniswapBridge.json",
         "test/generated-artifacts/TestUniswapExchange.json",
-        "test/generated-artifacts/TestUniswapExchangeFactory.json"
+        "test/generated-artifacts/TestUniswapExchangeFactory.json",
+        "test/generated-artifacts/TestWethIntegration.json"
     ]
 }

contracts/multisig/CHANGELOG.json

@@ -1,4 +1,76 @@
 [
+    {
+        "timestamp": 1609802516,
+        "version": "4.1.22",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1608692071,
+        "version": "4.1.21",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1608245516,
+        "version": "4.1.20",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1608105788,
+        "version": "4.1.19",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1607485227,
+        "version": "4.1.18",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1607381756,
+        "version": "4.1.17",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1606961263,
+        "version": "4.1.16",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1605763885,
+        "version": "4.1.15",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
     {
         "timestamp": 1605302002,
         "version": "4.1.14",

contracts/multisig/CHANGELOG.md

@@ -5,6 +5,38 @@ Edit the package's CHANGELOG.json file only.
 
 CHANGELOG
 
+## v4.1.22 - _January 4, 2021_
+
+    * Dependencies updated
+
+## v4.1.21 - _December 23, 2020_
+
+    * Dependencies updated
+
+## v4.1.20 - _December 17, 2020_
+
+    * Dependencies updated
+
+## v4.1.19 - _December 16, 2020_
+
+    * Dependencies updated
+
+## v4.1.18 - _December 9, 2020_
+
+    * Dependencies updated
+
+## v4.1.17 - _December 7, 2020_
+
+    * Dependencies updated
+
+## v4.1.16 - _December 3, 2020_
+
+    * Dependencies updated
+
+## v4.1.15 - _November 19, 2020_
+
+    * Dependencies updated
+
 ## v4.1.14 - _November 13, 2020_
 
     * Dependencies updated

contracts/multisig/package.json

@@ -1,6 +1,6 @@
 {
     "name": "@0x/contracts-multisig",
-    "version": "4.1.14",
+    "version": "4.1.22",
     "engines": {
         "node": ">=6.12"
     },
@@ -49,18 +49,18 @@
     },
     "homepage": "https://github.com/0xProject/protocol/tree/main/contracts/multisig",
     "devDependencies": {
-        "@0x/abi-gen": "^5.4.7",
-        "@0x/contracts-asset-proxy": "^3.6.5",
-        "@0x/contracts-erc20": "^3.2.8",
-        "@0x/contracts-gen": "2.0.18",
-        "@0x/contracts-test-utils": "^5.3.11",
-        "@0x/contracts-utils": "^4.5.8",
-        "@0x/dev-utils": "^4.0.1",
-        "@0x/sol-compiler": "^4.2.7",
+        "@0x/abi-gen": "^5.4.13",
+        "@0x/contracts-asset-proxy": "^3.7.3",
+        "@0x/contracts-erc20": "^3.3.0",
+        "@0x/contracts-gen": "^2.0.24",
+        "@0x/contracts-test-utils": "^5.3.18",
+        "@0x/contracts-utils": "^4.7.0",
+        "@0x/dev-utils": "^4.1.3",
+        "@0x/sol-compiler": "^4.4.1",
         "@0x/tslint-config": "^4.1.3",
-        "@0x/types": "^3.3.0",
-        "@0x/utils": "^6.1.0",
-        "@0x/web3-wrapper": "^7.2.8",
+        "@0x/types": "^3.3.1",
+        "@0x/utils": "^6.1.1",
+        "@0x/web3-wrapper": "^7.3.0",
         "@types/lodash": "4.14.104",
         "@types/mocha": "^5.2.7",
         "@types/node": "12.12.54",
@@ -78,9 +78,9 @@
         "typescript": "3.0.1"
     },
     "dependencies": {
-        "@0x/base-contract": "^6.2.11",
-        "@0x/typescript-typings": "^5.1.5",
-        "ethereum-types": "^3.3.3"
+        "@0x/base-contract": "^6.2.14",
+        "@0x/typescript-typings": "^5.1.6",
+        "ethereum-types": "^3.4.0"
     },
     "publishConfig": {
         "access": "public"

contracts/staking/CHANGELOG.json

@@ -1,4 +1,76 @@
 [
+    {
+        "timestamp": 1609802516,
+        "version": "2.0.29",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1608692071,
+        "version": "2.0.28",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1608245516,
+        "version": "2.0.27",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1608105788,
+        "version": "2.0.26",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1607485227,
+        "version": "2.0.25",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1607381756,
+        "version": "2.0.24",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1606961263,
+        "version": "2.0.23",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1605763885,
+        "version": "2.0.22",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
     {
         "timestamp": 1605302002,
         "version": "2.0.21",

contracts/staking/CHANGELOG.md

@@ -5,6 +5,38 @@ Edit the package's CHANGELOG.json file only.
 
 CHANGELOG
 
+## v2.0.29 - _January 4, 2021_
+
+    * Dependencies updated
+
+## v2.0.28 - _December 23, 2020_
+
+    * Dependencies updated
+
+## v2.0.27 - _December 17, 2020_
+
+    * Dependencies updated
+
+## v2.0.26 - _December 16, 2020_
+
+    * Dependencies updated
+
+## v2.0.25 - _December 9, 2020_
+
+    * Dependencies updated
+
+## v2.0.24 - _December 7, 2020_
+
+    * Dependencies updated
+
+## v2.0.23 - _December 3, 2020_
+
+    * Dependencies updated
+
+## v2.0.22 - _November 19, 2020_
+
+    * Dependencies updated
+
 ## v2.0.21 - _November 13, 2020_
 
     * Dependencies updated

contracts/staking/compiler.json

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

contracts/staking/package.json

@@ -1,6 +1,6 @@
 {
     "name": "@0x/contracts-staking",
-    "version": "2.0.21",
+    "version": "2.0.29",
     "engines": {
         "node": ">=6.12"
     },
@@ -53,20 +53,20 @@
     },
     "homepage": "https://github.com/0xProject/protocol/tree/main/contracts/tokens",
     "devDependencies": {
-        "@0x/abi-gen": "^5.4.7",
-        "@0x/contracts-asset-proxy": "^3.6.5",
-        "@0x/contracts-dev-utils": "^1.3.12",
-        "@0x/contracts-erc20": "^3.2.8",
-        "@0x/contracts-exchange-libs": "^4.3.14",
-        "@0x/contracts-gen": "2.0.18",
-        "@0x/contracts-utils": "^4.5.8",
-        "@0x/dev-utils": "^4.0.1",
-        "@0x/order-utils": "^10.4.6",
-        "@0x/sol-compiler": "^4.2.7",
+        "@0x/abi-gen": "^5.4.13",
+        "@0x/contracts-asset-proxy": "^3.7.3",
+        "@0x/contracts-dev-utils": "^1.3.20",
+        "@0x/contracts-erc20": "^3.3.0",
+        "@0x/contracts-exchange-libs": "^4.3.21",
+        "@0x/contracts-gen": "^2.0.24",
+        "@0x/contracts-utils": "^4.7.0",
+        "@0x/dev-utils": "^4.1.3",
+        "@0x/order-utils": "^10.4.13",
+        "@0x/sol-compiler": "^4.4.1",
         "@0x/ts-doc-gen": "^0.0.28",
         "@0x/tslint-config": "^4.1.3",
-        "@0x/types": "^3.3.0",
-        "@0x/web3-wrapper": "^7.2.8",
+        "@0x/types": "^3.3.1",
+        "@0x/web3-wrapper": "^7.3.0",
         "@types/lodash": "4.14.104",
         "@types/node": "12.12.54",
         "chai": "^4.0.1",
@@ -87,11 +87,11 @@
         "typescript": "3.0.1"
     },
     "dependencies": {
-        "@0x/base-contract": "^6.2.11",
-        "@0x/contracts-test-utils": "^5.3.11",
-        "@0x/typescript-typings": "^5.1.5",
-        "@0x/utils": "^6.1.0",
-        "ethereum-types": "^3.3.3",
+        "@0x/base-contract": "^6.2.14",
+        "@0x/contracts-test-utils": "^5.3.18",
+        "@0x/typescript-typings": "^5.1.6",
+        "@0x/utils": "^6.1.1",
+        "ethereum-types": "^3.4.0",
         "ethereumjs-util": "^5.1.1"
     },
     "publishConfig": {

contracts/test-utils/CHANGELOG.json

@@ -1,4 +1,67 @@
 [
+    {
+        "timestamp": 1609802516,
+        "version": "5.3.18",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1608692071,
+        "version": "5.3.17",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1608245516,
+        "version": "5.3.16",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1607485227,
+        "version": "5.3.15",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1607381756,
+        "version": "5.3.14",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1606961263,
+        "version": "5.3.13",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1605763885,
+        "version": "5.3.12",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
     {
         "timestamp": 1605302002,
         "version": "5.3.11",

contracts/test-utils/CHANGELOG.md

@@ -5,6 +5,34 @@ Edit the package's CHANGELOG.json file only.
 
 CHANGELOG
 
+## v5.3.18 - _January 4, 2021_
+
+    * Dependencies updated
+
+## v5.3.17 - _December 23, 2020_
+
+    * Dependencies updated
+
+## v5.3.16 - _December 17, 2020_
+
+    * Dependencies updated
+
+## v5.3.15 - _December 9, 2020_
+
+    * Dependencies updated
+
+## v5.3.14 - _December 7, 2020_
+
+    * Dependencies updated
+
+## v5.3.13 - _December 3, 2020_
+
+    * Dependencies updated
+
+## v5.3.12 - _November 19, 2020_
+
+    * Dependencies updated
+
 ## v5.3.11 - _November 13, 2020_
 
     * Dependencies updated

contracts/test-utils/package.json

@@ -1,6 +1,6 @@
 {
     "name": "@0x/contracts-test-utils",
-    "version": "5.3.11",
+    "version": "5.3.18",
     "engines": {
         "node": ">=6.12"
     },
@@ -34,7 +34,7 @@
     },
     "homepage": "https://github.com/0xProject/protocol/tree/main/contracts/test-utils",
     "devDependencies": {
-        "@0x/sol-compiler": "^4.2.7",
+        "@0x/sol-compiler": "^4.4.1",
         "@0x/tslint-config": "^4.1.3",
         "npm-run-all": "^4.1.2",
         "shx": "^0.2.2",
@@ -42,20 +42,20 @@
         "typescript": "3.0.1"
     },
     "dependencies": {
-        "@0x/assert": "^3.0.17",
-        "@0x/base-contract": "^6.2.11",
-        "@0x/contract-addresses": "^5.3.0",
-        "@0x/dev-utils": "^4.0.1",
-        "@0x/json-schemas": "^5.3.3",
-        "@0x/order-utils": "^10.4.6",
-        "@0x/sol-coverage": "^4.0.18",
-        "@0x/sol-profiler": "^4.1.8",
-        "@0x/sol-trace": "^3.0.18",
-        "@0x/subproviders": "^6.1.9",
-        "@0x/types": "^3.3.0",
-        "@0x/typescript-typings": "^5.1.5",
-        "@0x/utils": "^6.1.0",
-        "@0x/web3-wrapper": "^7.2.8",
+        "@0x/assert": "^3.0.19",
+        "@0x/base-contract": "^6.2.14",
+        "@0x/contract-addresses": "^5.8.0",
+        "@0x/dev-utils": "^4.1.3",
+        "@0x/json-schemas": "^5.3.4",
+        "@0x/order-utils": "^10.4.13",
+        "@0x/sol-coverage": "^4.0.24",
+        "@0x/sol-profiler": "^4.1.14",
+        "@0x/sol-trace": "^3.0.24",
+        "@0x/subproviders": "^6.2.3",
+        "@0x/types": "^3.3.1",
+        "@0x/typescript-typings": "^5.1.6",
+        "@0x/utils": "^6.1.1",
+        "@0x/web3-wrapper": "^7.3.0",
         "@types/bn.js": "^4.11.0",
         "@types/js-combinatorics": "^0.5.29",
         "@types/lodash": "4.14.104",
@@ -67,7 +67,7 @@
         "chai-bignumber": "^3.0.0",
         "decimal.js": "^10.2.0",
         "dirty-chai": "^2.0.1",
-        "ethereum-types": "^3.3.3",
+        "ethereum-types": "^3.4.0",
         "ethereumjs-util": "^5.1.1",
         "ethers": "~4.0.4",
         "js-combinatorics": "^0.5.3",

contracts/utils/CHANGELOG.json

@@ -1,4 +1,69 @@
 [
+    {
+        "version": "4.7.0",
+        "changes": [
+            {
+                "note": "Add `LibSafeMathV06.safeDowncastToUint128()`",
+                "pr": 97
+            }
+        ],
+        "timestamp": 1609802516
+    },
+    {
+        "timestamp": 1608692071,
+        "version": "4.6.5",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1608245516,
+        "version": "4.6.4",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1607485227,
+        "version": "4.6.3",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1607381756,
+        "version": "4.6.2",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "timestamp": 1606961263,
+        "version": "4.6.1",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "version": "4.6.0",
+        "changes": [
+            {
+                "note": "Add `uint128` functions to `LibSafeMathV06`",
+                "pr": 27
+            }
+        ],
+        "timestamp": 1605763885
+    },
     {
         "timestamp": 1605302002,
         "version": "4.5.8",

contracts/utils/CHANGELOG.md

@@ -5,6 +5,34 @@ Edit the package's CHANGELOG.json file only.
 
 CHANGELOG
 
+## v4.7.0 - _January 4, 2021_
+
+    * Add `LibSafeMathV06.safeDowncastToUint128()` (#97)
+
+## v4.6.5 - _December 23, 2020_
+
+    * Dependencies updated
+
+## v4.6.4 - _December 17, 2020_
+
+    * Dependencies updated
+
+## v4.6.3 - _December 9, 2020_
+
+    * Dependencies updated
+
+## v4.6.2 - _December 7, 2020_
+
+    * Dependencies updated
+
+## v4.6.1 - _December 3, 2020_
+
+    * Dependencies updated
+
+## v4.6.0 - _November 19, 2020_
+
+    * Add `uint128` functions to `LibSafeMathV06` (#27)
+
 ## v4.5.8 - _November 13, 2020_
 
     * Dependencies updated

contracts/utils/contracts/src/v06/LibSafeMathV06.sol

@@ -105,4 +105,100 @@ library LibSafeMathV06 {
     {
         return a < b ? a : b;
     }
+
+    function safeMul128(uint128 a, uint128 b)
+        internal
+        pure
+        returns (uint128)
+    {
+        if (a == 0) {
+            return 0;
+        }
+        uint128 c = a * b;
+        if (c / a != b) {
+            LibRichErrorsV06.rrevert(LibSafeMathRichErrorsV06.Uint256BinOpError(
+                LibSafeMathRichErrorsV06.BinOpErrorCodes.MULTIPLICATION_OVERFLOW,
+                a,
+                b
+            ));
+        }
+        return c;
+    }
+
+    function safeDiv128(uint128 a, uint128 b)
+        internal
+        pure
+        returns (uint128)
+    {
+        if (b == 0) {
+            LibRichErrorsV06.rrevert(LibSafeMathRichErrorsV06.Uint256BinOpError(
+                LibSafeMathRichErrorsV06.BinOpErrorCodes.DIVISION_BY_ZERO,
+                a,
+                b
+            ));
+        }
+        uint128 c = a / b;
+        return c;
+    }
+
+    function safeSub128(uint128 a, uint128 b)
+        internal
+        pure
+        returns (uint128)
+    {
+        if (b > a) {
+            LibRichErrorsV06.rrevert(LibSafeMathRichErrorsV06.Uint256BinOpError(
+                LibSafeMathRichErrorsV06.BinOpErrorCodes.SUBTRACTION_UNDERFLOW,
+                a,
+                b
+            ));
+        }
+        return a - b;
+    }
+
+    function safeAdd128(uint128 a, uint128 b)
+        internal
+        pure
+        returns (uint128)
+    {
+        uint128 c = a + b;
+        if (c < a) {
+            LibRichErrorsV06.rrevert(LibSafeMathRichErrorsV06.Uint256BinOpError(
+                LibSafeMathRichErrorsV06.BinOpErrorCodes.ADDITION_OVERFLOW,
+                a,
+                b
+            ));
+        }
+        return c;
+    }
+
+    function max128(uint128 a, uint128 b)
+        internal
+        pure
+        returns (uint128)
+    {
+        return a >= b ? a : b;
+    }
+
+    function min128(uint128 a, uint128 b)
+        internal
+        pure
+        returns (uint128)
+    {
+        return a < b ? a : b;
+    }
+
+    function safeDowncastToUint128(uint256 a)
+        internal
+        pure
+        returns (uint128)
+    {
+        if (a > type(uint128).max) {
+            LibRichErrorsV06.rrevert(LibSafeMathRichErrorsV06.Uint256DowncastError(
+                LibSafeMathRichErrorsV06.DowncastErrorCodes.VALUE_TOO_LARGE_TO_DOWNCAST_TO_UINT128,
+                a
+            ));
+        }
+        return uint128(a);
+    }
 }

contracts/utils/contracts/src/v06/errors/LibSafeMathRichErrorsV06.sol

@@ -39,7 +39,8 @@ library LibSafeMathRichErrorsV06 {
     enum DowncastErrorCodes {
         VALUE_TOO_LARGE_TO_DOWNCAST_TO_UINT32,
         VALUE_TOO_LARGE_TO_DOWNCAST_TO_UINT64,
-        VALUE_TOO_LARGE_TO_DOWNCAST_TO_UINT96
+        VALUE_TOO_LARGE_TO_DOWNCAST_TO_UINT96,
+        VALUE_TOO_LARGE_TO_DOWNCAST_TO_UINT128
     }
 
     // solhint-disable func-name-mixedcase

contracts/utils/package.json

@@ -1,6 +1,6 @@
 {
     "name": "@0x/contracts-utils",
-    "version": "4.5.8",
+    "version": "4.7.0",
     "engines": {
         "node": ">=6.12"
     },
@@ -50,15 +50,15 @@
     },
     "homepage": "https://github.com/0xProject/protocol/tree/main/contracts/utils",
     "devDependencies": {
-        "@0x/abi-gen": "^5.4.7",
-        "@0x/contracts-gen": "2.0.18",
-        "@0x/contracts-test-utils": "^5.3.11",
-        "@0x/dev-utils": "^4.0.1",
-        "@0x/order-utils": "^10.4.6",
-        "@0x/sol-compiler": "^4.2.7",
+        "@0x/abi-gen": "^5.4.13",
+        "@0x/contracts-gen": "^2.0.24",
+        "@0x/contracts-test-utils": "^5.3.18",
+        "@0x/dev-utils": "^4.1.3",
+        "@0x/order-utils": "^10.4.13",
+        "@0x/sol-compiler": "^4.4.1",
         "@0x/tslint-config": "^4.1.3",
-        "@0x/types": "^3.3.0",
-        "@0x/web3-wrapper": "^7.2.8",
+        "@0x/types": "^3.3.1",
+        "@0x/web3-wrapper": "^7.3.0",
         "@types/bn.js": "^4.11.0",
         "@types/lodash": "4.14.104",
         "@types/mocha": "^5.2.7",
@@ -79,11 +79,11 @@
         "typescript": "3.0.1"
     },
     "dependencies": {
-        "@0x/base-contract": "^6.2.11",
-        "@0x/typescript-typings": "^5.1.5",
-        "@0x/utils": "^6.1.0",
+        "@0x/base-contract": "^6.2.14",
+        "@0x/typescript-typings": "^5.1.6",
+        "@0x/utils": "^6.1.1",
         "bn.js": "^4.11.8",
-        "ethereum-types": "^3.3.3"
+        "ethereum-types": "^3.4.0"
     },
     "publishConfig": {
         "access": "public"

contracts/zero-ex/.npmignore

@@ -8,3 +8,4 @@
 # Blacklist tests in lib
 /lib/test/*
 # Package specific ignore
+/lib/scripts/*

contracts/zero-ex/CHANGELOG.json

@@ -1,4 +1,172 @@
 [
+    {
+        "version": "0.17.0",
+        "changes": [
+            {
+                "note": "Add DevUtils-like functions to `NativeOrdersFeature`",
+                "pr": 97
+            }
+        ],
+        "timestamp": 1609802516
+    },
+    {
+        "version": "0.16.0",
+        "changes": [
+            {
+                "note": "Fix CryptoCom rollup"
+            }
+        ],
+        "timestamp": 1608692071
+    },
+    {
+        "version": "0.15.0",
+        "changes": [
+            {
+                "note": "Add MixinBancor to BridgeAdapter",
+                "pr": 91
+            },
+            {
+                "note": "Add MixinCoFiX to BridgeAdapter",
+                "pr": 92
+            }
+        ],
+        "timestamp": 1608245516
+    },
+    {
+        "version": "0.14.0",
+        "changes": [
+            {
+                "note": "Use the `MetaTransaction` class from `@0x/protocol-utils` in tests.",
+                "pr": 90
+            }
+        ],
+        "timestamp": 1608149382
+    },
+    {
+        "version": "0.13.0",
+        "changes": [
+            {
+                "note": "Address audit feedback in UniswapFeature",
+                "pr": 82
+            },
+            {
+                "note": "Always transfer `msg.value` to the liquidity provider contract in LiquidityProviderFeature to",
+                "pr": 82
+            },
+            {
+                "note": "Remove backwards compatibility with old PLP/bridge interface in `LiquidityProviderFeature` and `MixinZeroExBridge`",
+                "pr": 85
+            }
+        ],
+        "timestamp": 1608105788
+    },
+    {
+        "version": "0.12.0",
+        "changes": [
+            {
+                "note": "Add test for selector collisions on the proxy",
+                "pr": 74
+            },
+            {
+                "note": "Move tooling out into `@0x/protocol-utils`.",
+                "pr": 76
+            }
+        ],
+        "timestamp": 1607485227
+    },
+    {
+        "timestamp": 1607381756,
+        "version": "0.11.1",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "version": "0.11.0",
+        "changes": [
+            {
+                "note": "Turn `LibTokenSpender` into `FixinTokenSpender`",
+                "pr": 38
+            },
+            {
+                "note": "Use bloom filters to check if a token is greedy and do not optimistically fall through transferFrom() if so",
+                "pr": 38
+            },
+            {
+                "note": "Revert to original proxy implementation",
+                "pr": 38
+            },
+            {
+                "note": "Fix incorrect cancel order event param",
+                "pr": 38
+            },
+            {
+                "note": "Add a gas limit to first `LibTokenSpender` and `UniswapFeature` transfer",
+                "pr": 38
+            },
+            {
+                "note": "Convert metatransactions to use `LibSignature`",
+                "pr": 31
+            },
+            {
+                "note": "Add metatransaction support for limit orders",
+                "pr": 44
+            },
+            {
+                "note": "Require RFQ orders to specify a transaction origin, and allow approved alternative addresses",
+                "pr": 47
+            },
+            {
+                "note": "Do not try to pull all tokens if selling all ETH in `TransformERC20Feature`",
+                "pr": 46
+            },
+            {
+                "note": "Remove protocol fees from all RFQ orders and add `taker` field to RFQ orders",
+                "pr": 45
+            },
+            {
+                "note": "Fix getRfqOrderInfo() to return status INVALID when missing txOrigin",
+                "pr": 50
+            },
+            {
+                "note": "Remove calldata signing functionality",
+                "pr": 51
+            },
+            {
+                "note": "Add a permissionless transformer deployer",
+                "pr": 55
+            },
+            {
+                "note": "Add Crypto.com to `BridgeAdapter`",
+                "pr": 43
+            },
+            {
+                "note": "Use `FeeCollectorController` contract for deploying `FeeCollector`s",
+                "pr": 59
+            }
+        ],
+        "timestamp": 1606961263
+    },
+    {
+        "version": "0.10.0",
+        "changes": [
+            {
+                "note": "Add `checkAllowance` flag to LibTokenSpender.spendERC20Tokens",
+                "pr": 39
+            },
+            {
+                "note": "Use new `checkAllowance` flag in LiquidityProviderFeature, TransformERC20Feature, and MetaTransactionsFeature",
+                "pr": 39
+            },
+            {
+                "note": "Add native orders features",
+                "pr": 27
+            }
+        ],
+        "timestamp": 1605763885
+    },
     {
         "version": "0.9.0",
         "changes": [
@@ -55,6 +223,10 @@
             {
                 "note": "Add `LibSignature` library",
                 "pr": 21
+            },
+            {
+                "note": "Add `LimitOrdersFeature`",
+                "pr": 27
             }
         ],
         "timestamp": 1604355662

contracts/zero-ex/CHANGELOG.md

@@ -5,6 +5,62 @@ Edit the package's CHANGELOG.json file only.
 
 CHANGELOG
 
+## v0.17.0 - _January 4, 2021_
+
+    * Add DevUtils-like functions to `NativeOrdersFeature` (#97)
+
+## v0.16.0 - _December 23, 2020_
+
+    * Fix CryptoCom rollup
+
+## v0.15.0 - _December 17, 2020_
+
+    * Add MixinBancor to BridgeAdapter (#91)
+    * Add MixinCoFiX to BridgeAdapter (#92)
+
+## v0.14.0 - _December 16, 2020_
+
+    * Use the `MetaTransaction` class from `@0x/protocol-utils` in tests. (#90)
+
+## v0.13.0 - _December 16, 2020_
+
+    * Address audit feedback in UniswapFeature (#82)
+    * Always transfer `msg.value` to the liquidity provider contract in LiquidityProviderFeature to (#82)
+    * Remove backwards compatibility with old PLP/bridge interface in `LiquidityProviderFeature` and `MixinZeroExBridge` (#85)
+
+## v0.12.0 - _December 9, 2020_
+
+    * Add test for selector collisions on the proxy (#74)
+    * Move tooling out into `@0x/protocol-utils`. (#76)
+
+## v0.11.1 - _December 7, 2020_
+
+    * Dependencies updated
+
+## v0.11.0 - _December 3, 2020_
+
+    * Turn `LibTokenSpender` into `FixinTokenSpender` (#38)
+    * Use bloom filters to check if a token is greedy and do not optimistically fall through transferFrom() if so (#38)
+    * Revert to original proxy implementation (#38)
+    * Fix incorrect cancel order event param (#38)
+    * Add a gas limit to first `LibTokenSpender` and `UniswapFeature` transfer (#38)
+    * Convert metatransactions to use `LibSignature` (#31)
+    * Add metatransaction support for limit orders (#44)
+    * Require RFQ orders to specify a transaction origin, and allow approved alternative addresses (#47)
+    * Do not try to pull all tokens if selling all ETH in `TransformERC20Feature` (#46)
+    * Remove protocol fees from all RFQ orders and add `taker` field to RFQ orders (#45)
+    * Fix getRfqOrderInfo() to return status INVALID when missing txOrigin (#50)
+    * Remove calldata signing functionality (#51)
+    * Add a permissionless transformer deployer (#55)
+    * Add Crypto.com to `BridgeAdapter` (#43)
+    * Use `FeeCollectorController` contract for deploying `FeeCollector`s (#59)
+
+## v0.10.0 - _November 19, 2020_
+
+    * Add `checkAllowance` flag to LibTokenSpender.spendERC20Tokens (#39)
+    * Use new `checkAllowance` flag in LiquidityProviderFeature, TransformERC20Feature, and MetaTransactionsFeature (#39)
+    * Add native orders features (#27)
+
 ## v0.9.0 - _November 13, 2020_
 
     * Rewrite the ZeroEx contract in Yul (#23)
@@ -25,6 +81,7 @@ CHANGELOG
 
     * Add support for collecting protocol fees in ETH or WETH (#2)
     * Add `LibSignature` library (#21)
+    * Add `LimitOrdersFeature` (#27)
 
 ## v0.5.1 - _October 28, 2020_
 

contracts/zero-ex/compiler.json

@@ -4,6 +4,7 @@
     "useDockerisedSolc": false,
     "isOfflineMode": false,
     "shouldSaveStandardInput": true,
+    "shouldCompileIndependently": true,
     "compilerSettings": {
         "evmVersion": "istanbul",
         "optimizer": {
@@ -19,7 +20,8 @@
                     "evm.bytecode.object",
                     "evm.bytecode.sourceMap",
                     "evm.deployedBytecode.object",
-                    "evm.deployedBytecode.sourceMap"
+                    "evm.deployedBytecode.sourceMap",
+                    "evm.methodIdentifiers"
                 ]
             }
         }

contracts/zero-ex/contracts/src/IZeroEx.sol

@@ -27,6 +27,7 @@ import "./features/ITransformERC20Feature.sol";
 import "./features/IMetaTransactionsFeature.sol";
 import "./features/IUniswapFeature.sol";
 import "./features/ILiquidityProviderFeature.sol";
+import "./features/INativeOrdersFeature.sol";
 
 
 /// @dev Interface for a fully featured Exchange Proxy.
@@ -38,7 +39,8 @@ interface IZeroEx is
     ITransformERC20Feature,
     IMetaTransactionsFeature,
     IUniswapFeature,
-    ILiquidityProviderFeature
+    ILiquidityProviderFeature,
+    INativeOrdersFeature
 {
     // solhint-disable state-visibility
 

contracts/zero-ex/contracts/src/ZeroEx.sol

@@ -19,12 +19,19 @@
 pragma solidity ^0.6.5;
 pragma experimental ABIEncoderV2;
 
+import "@0x/contracts-utils/contracts/src/v06/LibBytesV06.sol";
+import "./migrations/LibBootstrap.sol";
 import "./features/BootstrapFeature.sol";
 import "./storage/LibProxyStorage.sol";
+import "./errors/LibProxyRichErrors.sol";
+
 
 /// @dev An extensible proxy contract that serves as a universal entry point for
 ///      interacting with the 0x protocol.
 contract ZeroEx {
+    // solhint-disable separate-by-one-line-in-contract,indent,var-name-mixedcase
+    using LibBytesV06 for bytes;
+
     /// @dev Construct this contract and register the `BootstrapFeature` feature.
     ///      After constructing this contract, `bootstrap()` should be called
     ///      by `bootstrap()` to seed the initial feature set.
@@ -37,55 +44,48 @@ contract ZeroEx {
             address(bootstrap);
     }
 
-
     // solhint-disable state-visibility
 
     /// @dev Forwards calls to the appropriate implementation contract.
     fallback() external payable {
-        // This is used in assembly below as impls_slot.
-        mapping(bytes4 => address) storage impls =
-            LibProxyStorage.getStorage().impls;
-
-        assembly {
-            let cdlen := calldatasize()
-
-            // equivalent of receive() external payable {}
-            if iszero(cdlen) {
-                return(0, 0)
-            }
-
-            // Store at 0x40, to leave 0x00-0x3F for slot calculation below.
-            calldatacopy(0x40, 0, cdlen)
-            let selector := and(mload(0x40), 0xFFFFFFFF00000000000000000000000000000000000000000000000000000000)
-
-            // Slot for impls[selector] is keccak256(selector . impls_slot).
-            mstore(0, selector)
-            mstore(0x20, impls_slot)
-            let slot := keccak256(0, 0x40)
-
-            let delegate := sload(slot)
-            if iszero(delegate) {
-                // Revert with:
-                // abi.encodeWithSelector(
-                //   bytes4(keccak256("NotImplementedError(bytes4)")),
-                //   selector)
-                mstore(0, 0x734e6e1c00000000000000000000000000000000000000000000000000000000)
-                mstore(4, selector)
-                revert(0, 0x24)
-            }
-
-            let success := delegatecall(
-                gas(),
-                delegate,
-                0x40, cdlen,
-                0, 0
-            )
-            let rdlen := returndatasize()
-            returndatacopy(0, 0, rdlen)
-            if success {
-                return(0, rdlen)
-            }
-            revert(0, rdlen)
+        bytes4 selector = msg.data.readBytes4(0);
+        address impl = getFunctionImplementation(selector);
+        if (impl == address(0)) {
+            _revertWithData(LibProxyRichErrors.NotImplementedError(selector));
         }
+
+        (bool success, bytes memory resultData) = impl.delegatecall(msg.data);
+        if (!success) {
+            _revertWithData(resultData);
+        }
+        _returnWithData(resultData);
+    }
+
+    /// @dev Fallback for just receiving ether.
+    receive() external payable {}
+
+    // solhint-enable state-visibility
+
+    /// @dev Get the implementation contract of a registered function.
+    /// @param selector The function selector.
+    /// @return impl The implementation contract address.
+    function getFunctionImplementation(bytes4 selector)
+        public
+        view
+        returns (address impl)
+    {
+        return LibProxyStorage.getStorage().impls[selector];
+    }
+
+    /// @dev Revert with arbitrary bytes.
+    /// @param data Revert data.
+    function _revertWithData(bytes memory data) private pure {
+        assembly { revert(add(data, 32), mload(data)) }
+    }
+
+    /// @dev Return with arbitrary bytes.
+    /// @param data Return data.
+    function _returnWithData(bytes memory data) private pure {
+        assembly { return(add(data, 32), mload(data)) }
     }
 }

contracts/zero-ex/contracts/src/ZeroExOptimized.sol

@@ -0,0 +1,91 @@
+/*
+
+  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;
+pragma experimental ABIEncoderV2;
+
+import "./features/BootstrapFeature.sol";
+import "./storage/LibProxyStorage.sol";
+
+/// @dev An extensible proxy contract that serves as a universal entry point for
+///      interacting with the 0x protocol. Optimized version of ZeroEx.
+contract ZeroExOptimized {
+    /// @dev Construct this contract and register the `BootstrapFeature` feature.
+    ///      After constructing this contract, `bootstrap()` should be called
+    ///      by `bootstrap()` to seed the initial feature set.
+    /// @param bootstrapper Who can call `bootstrap()`.
+    constructor(address bootstrapper) public {
+        // Temporarily create and register the bootstrap feature.
+        // It will deregister itself after `bootstrap()` has been called.
+        BootstrapFeature bootstrap = new BootstrapFeature(bootstrapper);
+        LibProxyStorage.getStorage().impls[bootstrap.bootstrap.selector] =
+            address(bootstrap);
+    }
+
+
+    // solhint-disable state-visibility
+
+    /// @dev Forwards calls to the appropriate implementation contract.
+    fallback() external payable {
+        // This is used in assembly below as impls_slot.
+        mapping(bytes4 => address) storage impls =
+            LibProxyStorage.getStorage().impls;
+
+        assembly {
+            let cdlen := calldatasize()
+
+            // equivalent of receive() external payable {}
+            if iszero(cdlen) {
+                return(0, 0)
+            }
+
+            // Store at 0x40, to leave 0x00-0x3F for slot calculation below.
+            calldatacopy(0x40, 0, cdlen)
+            let selector := and(mload(0x40), 0xFFFFFFFF00000000000000000000000000000000000000000000000000000000)
+
+            // Slot for impls[selector] is keccak256(selector . impls_slot).
+            mstore(0, selector)
+            mstore(0x20, impls_slot)
+            let slot := keccak256(0, 0x40)
+
+            let delegate := sload(slot)
+            if iszero(delegate) {
+                // Revert with:
+                // abi.encodeWithSelector(
+                //   bytes4(keccak256("NotImplementedError(bytes4)")),
+                //   selector)
+                mstore(0, 0x734e6e1c00000000000000000000000000000000000000000000000000000000)
+                mstore(4, selector)
+                revert(0, 0x24)
+            }
+
+            let success := delegatecall(
+                gas(),
+                delegate,
+                0x40, cdlen,
+                0, 0
+            )
+            let rdlen := returndatasize()
+            returndatacopy(0, 0, rdlen)
+            if success {
+                return(0, rdlen)
+            }
+            revert(0, rdlen)
+        }
+    }
+}

contracts/zero-ex/contracts/src/errors/LibNativeOrdersRichErrors.sol

@@ -0,0 +1,172 @@
+/*
+
+  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;
+
+
+library LibNativeOrdersRichErrors {
+
+    // solhint-disable func-name-mixedcase
+
+    function ProtocolFeeRefundFailed(
+        address receiver,
+        uint256 refundAmount
+    )
+        internal
+        pure
+        returns (bytes memory)
+    {
+        return abi.encodeWithSelector(
+            bytes4(keccak256("ProtocolFeeRefundFailed(address,uint256)")),
+            receiver,
+            refundAmount
+        );
+    }
+
+    function OrderNotFillableByOriginError(
+        bytes32 orderHash,
+        address txOrigin,
+        address orderTxOrigin
+    )
+        internal
+        pure
+        returns (bytes memory)
+    {
+        return abi.encodeWithSelector(
+            bytes4(keccak256("OrderNotFillableByOriginError(bytes32,address,address)")),
+            orderHash,
+            txOrigin,
+            orderTxOrigin
+        );
+    }
+
+    function OrderNotFillableError(
+        bytes32 orderHash,
+        uint8 orderStatus
+    )
+        internal
+        pure
+        returns (bytes memory)
+    {
+        return abi.encodeWithSelector(
+            bytes4(keccak256("OrderNotFillableError(bytes32,uint8)")),
+            orderHash,
+            orderStatus
+        );
+    }
+
+    function OrderNotSignedByMakerError(
+        bytes32 orderHash,
+        address signer,
+        address maker
+    )
+        internal
+        pure
+        returns (bytes memory)
+    {
+        return abi.encodeWithSelector(
+            bytes4(keccak256("OrderNotSignedByMakerError(bytes32,address,address)")),
+            orderHash,
+            signer,
+            maker
+        );
+    }
+
+    function OrderNotFillableBySenderError(
+        bytes32 orderHash,
+        address sender,
+        address orderSender
+    )
+        internal
+        pure
+        returns (bytes memory)
+    {
+        return abi.encodeWithSelector(
+            bytes4(keccak256("OrderNotFillableBySenderError(bytes32,address,address)")),
+            orderHash,
+            sender,
+            orderSender
+        );
+    }
+
+    function OrderNotFillableByTakerError(
+        bytes32 orderHash,
+        address taker,
+        address orderTaker
+    )
+        internal
+        pure
+        returns (bytes memory)
+    {
+        return abi.encodeWithSelector(
+            bytes4(keccak256("OrderNotFillableByTakerError(bytes32,address,address)")),
+            orderHash,
+            taker,
+            orderTaker
+        );
+    }
+
+    function CancelSaltTooLowError(
+        uint256 minValidSalt,
+        uint256 oldMinValidSalt
+    )
+        internal
+        pure
+        returns (bytes memory)
+    {
+        return abi.encodeWithSelector(
+            bytes4(keccak256("CancelSaltTooLowError(uint256,uint256)")),
+            minValidSalt,
+            oldMinValidSalt
+        );
+    }
+
+    function FillOrKillFailedError(
+        bytes32 orderHash,
+        uint256 takerTokenFilledAmount,
+        uint256 takerTokenFillAmount
+    )
+        internal
+        pure
+        returns (bytes memory)
+    {
+        return abi.encodeWithSelector(
+            bytes4(keccak256("FillOrKillFailedError(bytes32,uint256,uint256)")),
+            orderHash,
+            takerTokenFilledAmount,
+            takerTokenFillAmount
+        );
+    }
+
+    function OnlyOrderMakerAllowed(
+        bytes32 orderHash,
+        address sender,
+        address maker
+    )
+        internal
+        pure
+        returns (bytes memory)
+    {
+        return abi.encodeWithSelector(
+            bytes4(keccak256("OnlyOrderMakerAllowed(bytes32,address,address)")),
+            orderHash,
+            sender,
+            maker
+        );
+    }
+}

contracts/zero-ex/contracts/src/external/FeeCollector.sol

@@ -57,9 +57,8 @@ contract FeeCollector is AuthorizableV06 {
         external
         onlyAuthorized
     {
-        // Leave 1 wei behind to avoid expensive zero-->non-zero state change.
-        if (address(this).balance > 1) {
-            weth.deposit{value: address(this).balance - 1}();
+        if (address(this).balance > 0) {
+            weth.deposit{value: address(this).balance}();
         }
     }
 }

contracts/zero-ex/contracts/src/external/FeeCollectorController.sol

@@ -0,0 +1,92 @@
+/*
+
+  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;
+pragma experimental ABIEncoderV2;
+
+import "@0x/contracts-erc20/contracts/src/v06/IEtherTokenV06.sol";
+import "../vendor/v3/IStaking.sol";
+import "./FeeCollector.sol";
+import "./LibFeeCollector.sol";
+
+
+/// @dev A contract that manages `FeeCollector` contracts.
+contract FeeCollectorController {
+
+    /// @dev Hash of the fee collector init code.
+    bytes32 public immutable FEE_COLLECTOR_INIT_CODE_HASH;
+    /// @dev The WETH contract.
+    IEtherTokenV06 private immutable WETH;
+    /// @dev The staking contract.
+    IStaking private immutable STAKING;
+
+    constructor(
+        IEtherTokenV06 weth,
+        IStaking staking
+    )
+        public
+    {
+        FEE_COLLECTOR_INIT_CODE_HASH = keccak256(type(FeeCollector).creationCode);
+        WETH = weth;
+        STAKING = staking;
+    }
+
+    /// @dev Deploy (if needed) a `FeeCollector` contract for `poolId`
+    ///      and wrap its ETH into WETH. Anyone may call this.
+    /// @param poolId The pool ID associated with the staking pool.
+    /// @return feeCollector The `FeeCollector` contract instance.
+    function prepareFeeCollectorToPayFees(bytes32 poolId)
+        external
+        returns (FeeCollector feeCollector)
+    {
+        feeCollector = getFeeCollector(poolId);
+        uint256 codeSize;
+        assembly {
+            codeSize := extcodesize(feeCollector)
+        }
+
+        if (codeSize == 0) {
+            // Create and initialize the contract if necessary.
+            new FeeCollector{salt: bytes32(poolId)}();
+            feeCollector.initialize(WETH, STAKING, poolId);
+        }
+
+        if (address(feeCollector).balance > 1) {
+            feeCollector.convertToWeth(WETH);
+        }
+
+        return feeCollector;
+    }
+
+    /// @dev Get the `FeeCollector` contract for a given pool ID. The contract
+    ///      will not actually exist until `prepareFeeCollectorToPayFees()`
+    ///      has been called once.
+    /// @param poolId The pool ID associated with the staking pool.
+    /// @return feeCollector The `FeeCollector` contract instance.
+    function getFeeCollector(bytes32 poolId)
+        public
+        view
+        returns (FeeCollector feeCollector)
+    {
+        return FeeCollector(LibFeeCollector.getFeeCollectorAddress(
+            address(this),
+            FEE_COLLECTOR_INIT_CODE_HASH,
+            poolId
+        ));
+    }
+}

contracts/zero-ex/contracts/src/external/LibFeeCollector.sol

@@ -0,0 +1,43 @@
+/*
+
+  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;
+pragma experimental ABIEncoderV2;
+
+
+/// @dev Helpers for computing `FeeCollector` contract addresses.
+library LibFeeCollector {
+
+    /// @dev Compute the CREATE2 address for a fee collector.
+    /// @param controller The address of the `FeeCollectorController` contract.
+    /// @param initCodeHash The init code hash of the `FeeCollector` contract.
+    /// @param poolId The fee collector's pool ID.
+    function getFeeCollectorAddress(address controller, bytes32 initCodeHash, bytes32 poolId)
+        internal
+        pure
+        returns (address payable feeCollectorAddress)
+    {
+        // Compute the CREATE2 address for the fee collector.
+        return address(uint256(keccak256(abi.encodePacked(
+            byte(0xff),
+            controller,
+            poolId, // pool ID is salt
+            initCodeHash
+        ))));
+    }
+}

contracts/zero-ex/contracts/src/external/LiquidityProviderSandbox.sol

@@ -68,21 +68,13 @@ contract LiquidityProviderSandbox is
         onlyOwner
         override
     {
-        try ILiquidityProvider(provider).sellTokenForToken(
+        ILiquidityProvider(provider).sellTokenForToken(
             inputToken,
             outputToken,
             recipient,
             minBuyAmount,
             auxiliaryData
-        ) {} catch {
-            IERC20Bridge(provider).bridgeTransferFrom(
-                outputToken,
-                provider,
-                recipient,
-                minBuyAmount,
-                auxiliaryData
-            );
-        }
+        );
     }
 
     /// @dev Calls `sellEthForToken` on the given `provider` contract to

contracts/zero-ex/contracts/src/external/PermissionlessTransformerDeployer.sol

@@ -0,0 +1,114 @@
+/*
+
+  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;
+pragma experimental ABIEncoderV2;
+
+
+/// @dev Deployer contract for ERC20 transformers.
+contract PermissionlessTransformerDeployer {
+    /// @dev Emitted when a contract is deployed via `deploy()`.
+    /// @param deployedAddress The address of the deployed contract.
+    /// @param salt The deployment salt.
+    /// @param sender The caller of `deploy()`.
+    event Deployed(address deployedAddress, bytes32 salt, address sender);
+
+    // @dev Mapping of deployed contract address to the deployment salt.
+    mapping (address => bytes32) public toDeploymentSalt;
+    // @dev Mapping of deployed contract address to the init code hash.
+    mapping (address => bytes32) public toInitCodeHash;
+
+    /// @dev Deploy a new contract. Any attached ETH will be forwarded.
+    function deploy(bytes memory bytecode, bytes32 salt)
+        public
+        payable
+        returns (address deployedAddress)
+    {
+        assembly {
+            deployedAddress := create2(callvalue(), add(bytecode, 32), mload(bytecode), salt)
+        }
+        require(deployedAddress != address(0), 'PermissionlessTransformerDeployer/DEPLOY_FAILED');
+        require(isDelegateCallSafe(deployedAddress), 'PermissionlessTransformerDeployer/UNSAFE_CODE');
+        toDeploymentSalt[deployedAddress] = salt;
+        toInitCodeHash[deployedAddress] = keccak256(bytecode);
+        emit Deployed(deployedAddress, salt, msg.sender);
+    }
+
+    /// @dev Checks whether a given address is safe to be called via
+    ///      delegatecall. A contract is considered unsafe if it includes any
+    ///      of the following opcodes: CALLCODE, DELEGATECALL, SELFDESTRUCT,
+    ///      CREATE, CREATE2, SLOAD, and STORE. This code is adapted from
+    ///      https://github.com/dharma-eng/dharma-smart-wallet/blob/master/contracts/helpers/IndestructibleRegistry.sol
+    /// @param target The address to check.
+    /// @return True if the contract is considered safe for delegatecall.
+    function isDelegateCallSafe(address target) public view returns (bool) {
+        uint256 size;
+        assembly { size := extcodesize(target) }
+        require(size > 0, 'PermissionlessTransformerDeployer/NO_CODE');
+
+        bytes memory extcode = new bytes(size);
+        assembly {
+            extcodecopy(target, add(extcode, 32), 0, size)
+        }
+
+        // Look for any reachable, impermissible opcodes.
+        bool reachable = true;
+        for (uint256 i = 0; i < extcode.length; i++) {
+            uint8 op = uint8(extcode[i]);
+
+            // If the opcode is a PUSH, skip over the push data.
+            if (op > 95 && op < 128) { // pushN
+                i += (op - 95);
+                continue;
+            }
+
+            if (reachable) {
+                // If execution is halted, mark subsequent opcodes unreachable.
+                if (
+                    op == 254 || // invalid
+                    op == 243 || // return
+                    op == 253 || // revert
+                    op == 86  || // jump
+                    op == 0      // stop
+                ) {
+                    reachable = false;
+                    continue;
+                }
+
+                // If opcode is impermissible, contract is unsafe.
+                if (
+                    op == 242 || // callcode
+                    op == 244 || // delegatecall
+                    op == 255 || // selfdestruct
+                    op == 240 || // create
+                    op == 245 || // create2
+                    op == 84  || // sload
+                    op == 85     // sstore
+                ) {
+                    return false;
+                }
+            } else if (op == 91) { // jumpdest
+                // After a JUMPDEST, opcodes are reachable again.
+                reachable = true;
+            }
+        }
+
+        return true; // No impermissible opcodes found.
+    }
+}
+

contracts/zero-ex/contracts/src/features/IMetaTransactionsFeature.sol

@@ -20,11 +20,10 @@ pragma solidity ^0.6.5;
 pragma experimental ABIEncoderV2;
 
 import "@0x/contracts-erc20/contracts/src/v06/IERC20TokenV06.sol";
-
+import "./libs/LibSignature.sol";
 
 /// @dev Meta-transactions feature.
 interface IMetaTransactionsFeature {
-
     /// @dev Describes an exchange proxy meta transaction.
     struct MetaTransactionData {
         // Signer of meta-transaction. On whose behalf to execute the MTX.
@@ -68,7 +67,7 @@ interface IMetaTransactionsFeature {
     /// @return returnResult The ABI-encoded result of the underlying call.
     function executeMetaTransaction(
         MetaTransactionData calldata mtx,
-        bytes calldata signature
+        LibSignature.Signature calldata signature
     )
         external
         payable
@@ -80,7 +79,7 @@ interface IMetaTransactionsFeature {
     /// @return returnResults The ABI-encoded results of the underlying calls.
     function batchExecuteMetaTransactions(
         MetaTransactionData[] calldata mtxs,
-        bytes[] calldata signatures
+        LibSignature.Signature[] calldata signatures
     )
         external
         payable
@@ -88,14 +87,14 @@ interface IMetaTransactionsFeature {
 
     /// @dev Execute a meta-transaction via `sender`. Privileged variant.
     ///      Only callable from within.
-    /// @param sender Who is executing the meta-transaction..
+    /// @param sender Who is executing the meta-transaction.
     /// @param mtx The meta-transaction.
     /// @param signature The signature by `mtx.signer`.
     /// @return returnResult The ABI-encoded result of the underlying call.
     function _executeMetaTransaction(
         address sender,
-        MetaTransactionData calldata mtx,
-        bytes calldata signature
+        MetaTransactionData memory mtx,
+        LibSignature.Signature memory signature
     )
         external
         payable

contracts/zero-ex/contracts/src/features/INativeOrdersFeature.sol

@@ -0,0 +1,426 @@
+/*
+
+  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;
+pragma experimental ABIEncoderV2;
+
+import "@0x/contracts-erc20/contracts/src/v06/IERC20TokenV06.sol";
+import "./libs/LibSignature.sol";
+import "./libs/LibNativeOrder.sol";
+
+
+/// @dev Feature for interacting with limit orders.
+interface INativeOrdersFeature {
+
+    /// @dev Emitted whenever a `LimitOrder` is filled.
+    /// @param orderHash The canonical hash of the order.
+    /// @param maker The maker of the order.
+    /// @param taker The taker of the order.
+    /// @param feeRecipient Fee recipient of the order.
+    /// @param takerTokenFilledAmount How much taker token was filled.
+    /// @param makerTokenFilledAmount How much maker token was filled.
+    /// @param protocolFeePaid How much protocol fee was paid.
+    /// @param pool The fee pool associated with this order.
+    event LimitOrderFilled(
+        bytes32 orderHash,
+        address maker,
+        address taker,
+        address feeRecipient,
+        address makerToken,
+        address takerToken,
+        uint128 takerTokenFilledAmount,
+        uint128 makerTokenFilledAmount,
+        uint128 takerTokenFeeFilledAmount,
+        uint256 protocolFeePaid,
+        bytes32 pool
+    );
+
+    /// @dev Emitted whenever an `RfqOrder` is filled.
+    /// @param orderHash The canonical hash of the order.
+    /// @param maker The maker of the order.
+    /// @param taker The taker of the order.
+    /// @param takerTokenFilledAmount How much taker token was filled.
+    /// @param makerTokenFilledAmount How much maker token was filled.
+    /// @param pool The fee pool associated with this order.
+    event RfqOrderFilled(
+        bytes32 orderHash,
+        address maker,
+        address taker,
+        address makerToken,
+        address takerToken,
+        uint128 takerTokenFilledAmount,
+        uint128 makerTokenFilledAmount,
+        bytes32 pool
+    );
+
+    /// @dev Emitted whenever a limit or RFQ order is cancelled.
+    /// @param orderHash The canonical hash of the order.
+    /// @param maker The order maker.
+    event OrderCancelled(
+        bytes32 orderHash,
+        address maker
+    );
+
+    /// @dev Emitted whenever Limit orders are cancelled by pair by a maker.
+    /// @param maker The maker of the order.
+    /// @param makerToken The maker token in a pair for the orders cancelled.
+    /// @param takerToken The taker token in a pair for the orders cancelled.
+    /// @param minValidSalt The new minimum valid salt an order with this pair must
+    ///        have.
+    event PairCancelledLimitOrders(
+        address maker,
+        address makerToken,
+        address takerToken,
+        uint256 minValidSalt
+    );
+
+    /// @dev Emitted whenever RFQ orders are cancelled by pair by a maker.
+    /// @param maker The maker of the order.
+    /// @param makerToken The maker token in a pair for the orders cancelled.
+    /// @param takerToken The taker token in a pair for the orders cancelled.
+    /// @param minValidSalt The new minimum valid salt an order with this pair must
+    ///        have.
+    event PairCancelledRfqOrders(
+        address maker,
+        address makerToken,
+        address takerToken,
+        uint256 minValidSalt
+    );
+
+    /// @dev Emitted when new addresses are allowed or disallowed to fill
+    ///      orders with a given txOrigin.
+    /// @param origin The address doing the allowing.
+    /// @param addrs The address being allowed/disallowed.
+    /// @param allowed Indicates whether the address should be allowed.
+    event RfqOrderOriginsAllowed(
+        address origin,
+        address[] addrs,
+        bool allowed
+    );
+
+    /// @dev Transfers protocol fees from the `FeeCollector` pools into
+    ///      the staking contract.
+    /// @param poolIds Staking pool IDs
+    function transferProtocolFeesForPools(bytes32[] calldata poolIds)
+        external;
+
+    /// @dev Fill a limit order. The taker and sender will be the caller.
+    /// @param order The limit order. ETH protocol fees can be
+    ///      attached to this call. Any unspent ETH will be refunded to
+    ///      the caller.
+    /// @param signature The order signature.
+    /// @param takerTokenFillAmount Maximum taker token amount to fill this order with.
+    /// @return takerTokenFilledAmount How much maker token was filled.
+    /// @return makerTokenFilledAmount How much maker token was filled.
+    function fillLimitOrder(
+        LibNativeOrder.LimitOrder calldata order,
+        LibSignature.Signature calldata signature,
+        uint128 takerTokenFillAmount
+    )
+        external
+        payable
+        returns (uint128 takerTokenFilledAmount, uint128 makerTokenFilledAmount);
+
+    /// @dev Fill an RFQ order for up to `takerTokenFillAmount` taker tokens.
+    ///      The taker will be the caller.
+    /// @param order The RFQ order.
+    /// @param signature The order signature.
+    /// @param takerTokenFillAmount Maximum taker token amount to fill this order with.
+    /// @return takerTokenFilledAmount How much maker token was filled.
+    /// @return makerTokenFilledAmount How much maker token was filled.
+    function fillRfqOrder(
+        LibNativeOrder.RfqOrder calldata order,
+        LibSignature.Signature calldata signature,
+        uint128 takerTokenFillAmount
+    )
+        external
+        returns (uint128 takerTokenFilledAmount, uint128 makerTokenFilledAmount);
+
+    /// @dev Fill an RFQ order for exactly `takerTokenFillAmount` taker tokens.
+    ///      The taker will be the caller. ETH protocol fees can be
+    ///      attached to this call. Any unspent ETH will be refunded to
+    ///      the caller.
+    /// @param order The limit order.
+    /// @param signature The order signature.
+    /// @param takerTokenFillAmount How much taker token to fill this order with.
+    /// @return makerTokenFilledAmount How much maker token was filled.
+    function fillOrKillLimitOrder(
+        LibNativeOrder.LimitOrder calldata order,
+        LibSignature.Signature calldata signature,
+        uint128 takerTokenFillAmount
+    )
+        external
+        payable
+        returns (uint128 makerTokenFilledAmount);
+
+    /// @dev Fill an RFQ order for exactly `takerTokenFillAmount` taker tokens.
+    ///      The taker will be the caller.
+    /// @param order The RFQ order.
+    /// @param signature The order signature.
+    /// @param takerTokenFillAmount How much taker token to fill this order with.
+    /// @return makerTokenFilledAmount How much maker token was filled.
+    function fillOrKillRfqOrder(
+        LibNativeOrder.RfqOrder calldata order,
+        LibSignature.Signature calldata signature,
+        uint128 takerTokenFillAmount
+    )
+        external
+        returns (uint128 makerTokenFilledAmount);
+
+    /// @dev Fill a limit order. Internal variant. ETH protocol fees can be
+    ///      attached to this call. Any unspent ETH will be refunded to
+    ///      `msg.sender` (not `sender`).
+    /// @param order The limit order.
+    /// @param signature The order signature.
+    /// @param takerTokenFillAmount Maximum taker token to fill this order with.
+    /// @param taker The order taker.
+    /// @param sender The order sender.
+    /// @return takerTokenFilledAmount How much maker token was filled.
+    /// @return makerTokenFilledAmount How much maker token was filled.
+    function _fillLimitOrder(
+        LibNativeOrder.LimitOrder calldata order,
+        LibSignature.Signature calldata signature,
+        uint128 takerTokenFillAmount,
+        address taker,
+        address sender
+    )
+        external
+        payable
+        returns (uint128 takerTokenFilledAmount, uint128 makerTokenFilledAmount);
+
+    /// @dev Fill an RFQ order. Internal variant.
+    /// @param order The RFQ order.
+    /// @param signature The order signature.
+    /// @param takerTokenFillAmount Maximum taker token to fill this order with.
+    /// @param taker The order taker.
+    /// @return takerTokenFilledAmount How much maker token was filled.
+    /// @return makerTokenFilledAmount How much maker token was filled.
+    function _fillRfqOrder(
+        LibNativeOrder.RfqOrder calldata order,
+        LibSignature.Signature calldata signature,
+        uint128 takerTokenFillAmount,
+        address taker
+    )
+        external
+        returns (uint128 takerTokenFilledAmount, uint128 makerTokenFilledAmount);
+
+    /// @dev Cancel a single limit order. The caller must be the maker.
+    ///      Silently succeeds if the order has already been cancelled.
+    /// @param order The limit order.
+    function cancelLimitOrder(LibNativeOrder.LimitOrder calldata order)
+        external;
+
+    /// @dev Cancel a single RFQ order. The caller must be the maker.
+    ///      Silently succeeds if the order has already been cancelled.
+    /// @param order The RFQ order.
+    function cancelRfqOrder(LibNativeOrder.RfqOrder calldata order)
+        external;
+
+    /// @dev Mark what tx.origin addresses are allowed to fill an order that
+    ///      specifies the message sender as its txOrigin.
+    /// @param origins An array of origin addresses to update.
+    /// @param allowed True to register, false to unregister.
+    function registerAllowedRfqOrigins(address[] memory origins, bool allowed)
+        external;
+
+    /// @dev Cancel multiple limit orders. The caller must be the maker.
+    ///      Silently succeeds if the order has already been cancelled.
+    /// @param orders The limit orders.
+    function batchCancelLimitOrders(LibNativeOrder.LimitOrder[] calldata orders)
+        external;
+
+    /// @dev Cancel multiple RFQ orders. The caller must be the maker.
+    ///      Silently succeeds if the order has already been cancelled.
+    /// @param orders The RFQ orders.
+    function batchCancelRfqOrders(LibNativeOrder.RfqOrder[] calldata orders)
+        external;
+
+    /// @dev Cancel all limit orders for a given maker and pair with a salt less
+    ///      than the value provided. The caller must be the maker. Subsequent
+    ///      calls to this function with the same caller and pair require the
+    ///      new salt to be >= the old salt.
+    /// @param makerToken The maker token.
+    /// @param takerToken The taker token.
+    /// @param minValidSalt The new minimum valid salt.
+    function cancelPairLimitOrders(
+        IERC20TokenV06 makerToken,
+        IERC20TokenV06 takerToken,
+        uint256 minValidSalt
+    )
+        external;
+
+    /// @dev Cancel all limit orders for a given maker and pair with a salt less
+    ///      than the value provided. The caller must be the maker. Subsequent
+    ///      calls to this function with the same caller and pair require the
+    ///      new salt to be >= the old salt.
+    /// @param makerTokens The maker tokens.
+    /// @param takerTokens The taker tokens.
+    /// @param minValidSalts The new minimum valid salts.
+    function batchCancelPairLimitOrders(
+        IERC20TokenV06[] calldata makerTokens,
+        IERC20TokenV06[] calldata takerTokens,
+        uint256[] calldata minValidSalts
+    )
+        external;
+
+    /// @dev Cancel all RFQ orders for a given maker and pair with a salt less
+    ///      than the value provided. The caller must be the maker. Subsequent
+    ///      calls to this function with the same caller and pair require the
+    ///      new salt to be >= the old salt.
+    /// @param makerToken The maker token.
+    /// @param takerToken The taker token.
+    /// @param minValidSalt The new minimum valid salt.
+    function cancelPairRfqOrders(
+        IERC20TokenV06 makerToken,
+        IERC20TokenV06 takerToken,
+        uint256 minValidSalt
+    )
+        external;
+
+    /// @dev Cancel all RFQ orders for a given maker and pair with a salt less
+    ///      than the value provided. The caller must be the maker. Subsequent
+    ///      calls to this function with the same caller and pair require the
+    ///      new salt to be >= the old salt.
+    /// @param makerTokens The maker tokens.
+    /// @param takerTokens The taker tokens.
+    /// @param minValidSalts The new minimum valid salts.
+    function batchCancelPairRfqOrders(
+        IERC20TokenV06[] calldata makerTokens,
+        IERC20TokenV06[] calldata takerTokens,
+        uint256[] calldata minValidSalts
+    )
+        external;
+
+    /// @dev Get the order info for a limit order.
+    /// @param order The limit order.
+    /// @return orderInfo Info about the order.
+    function getLimitOrderInfo(LibNativeOrder.LimitOrder calldata order)
+        external
+        view
+        returns (LibNativeOrder.OrderInfo memory orderInfo);
+
+    /// @dev Get the order info for an RFQ order.
+    /// @param order The RFQ order.
+    /// @return orderInfo Info about the order.
+    function getRfqOrderInfo(LibNativeOrder.RfqOrder calldata order)
+        external
+        view
+        returns (LibNativeOrder.OrderInfo memory orderInfo);
+
+    /// @dev Get the canonical hash of a limit order.
+    /// @param order The limit order.
+    /// @return orderHash The order hash.
+    function getLimitOrderHash(LibNativeOrder.LimitOrder calldata order)
+        external
+        view
+        returns (bytes32 orderHash);
+
+    /// @dev Get the canonical hash of an RFQ order.
+    /// @param order The RFQ order.
+    /// @return orderHash The order hash.
+    function getRfqOrderHash(LibNativeOrder.RfqOrder calldata order)
+        external
+        view
+        returns (bytes32 orderHash);
+
+    /// @dev Get the protocol fee multiplier. This should be multiplied by the
+    ///      gas price to arrive at the required protocol fee to fill a native order.
+    /// @return multiplier The protocol fee multiplier.
+    function getProtocolFeeMultiplier()
+        external
+        view
+        returns (uint32 multiplier);
+
+    /// @dev Get order info, fillable amount, and signature validity for a limit order.
+    ///      Fillable amount is determined using balances and allowances of the maker.
+    /// @param order The limit order.
+    /// @param signature The order signature.
+    /// @return orderInfo Info about the order.
+    /// @return actualFillableTakerTokenAmount How much of the order is fillable
+    ///         based on maker funds, in taker tokens.
+    /// @return isSignatureValid Whether the signature is valid.
+    function getLimitOrderRelevantState(
+        LibNativeOrder.LimitOrder calldata order,
+        LibSignature.Signature calldata signature
+    )
+        external
+        view
+        returns (
+            LibNativeOrder.OrderInfo memory orderInfo,
+            uint128 actualFillableTakerTokenAmount,
+            bool isSignatureValid
+        );
+
+    /// @dev Get order info, fillable amount, and signature validity for an RFQ order.
+    ///      Fillable amount is determined using balances and allowances of the maker.
+    /// @param order The RFQ order.
+    /// @param signature The order signature.
+    /// @return orderInfo Info about the order.
+    /// @return actualFillableTakerTokenAmount How much of the order is fillable
+    ///         based on maker funds, in taker tokens.
+    /// @return isSignatureValid Whether the signature is valid.
+    function getRfqOrderRelevantState(
+        LibNativeOrder.RfqOrder calldata order,
+        LibSignature.Signature calldata signature
+    )
+        external
+        view
+        returns (
+            LibNativeOrder.OrderInfo memory orderInfo,
+            uint128 actualFillableTakerTokenAmount,
+            bool isSignatureValid
+        );
+
+    /// @dev Batch version of `getLimitOrderRelevantState()`.
+    /// @param orders The limit orders.
+    /// @param signatures The order signatures.
+    /// @return orderInfos Info about the orders.
+    /// @return actualFillableTakerTokenAmounts How much of each order is fillable
+    ///         based on maker funds, in taker tokens.
+    /// @return isSignatureValids Whether each signature is valid for the order.
+    function batchGetLimitOrderRelevantStates(
+        LibNativeOrder.LimitOrder[] calldata orders,
+        LibSignature.Signature[] calldata signatures
+    )
+        external
+        view
+        returns (
+            LibNativeOrder.OrderInfo[] memory orderInfos,
+            uint128[] memory actualFillableTakerTokenAmounts,
+            bool[] memory isSignatureValids
+        );
+
+    /// @dev Batch version of `getRfqOrderRelevantState()`.
+    /// @param orders The RFQ orders.
+    /// @param signatures The order signatures.
+    /// @return orderInfos Info about the orders.
+    /// @return actualFillableTakerTokenAmounts How much of each order is fillable
+    ///         based on maker funds, in taker tokens.
+    /// @return isSignatureValids Whether each signature is valid for the order.
+    function batchGetRfqOrderRelevantStates(
+        LibNativeOrder.RfqOrder[] calldata orders,
+        LibSignature.Signature[] calldata signatures
+    )
+        external
+        view
+        returns (
+            LibNativeOrder.OrderInfo[] memory orderInfos,
+            uint128[] memory actualFillableTakerTokenAmounts,
+            bool[] memory isSignatureValids
+        );
+}

contracts/zero-ex/contracts/src/features/ISimpleFunctionRegistryFeature.sol

@@ -57,12 +57,4 @@ interface ISimpleFunctionRegistryFeature {
         external
         view
         returns (address impl);
-
-    /// @dev Get the implementation contract of a registered function.
-    /// @param selector The function selector.
-    /// @return impl The implementation contract address.
-    function getFunctionImplementation(bytes4 selector)
-        external
-        view
-        returns (address impl);
 }

contracts/zero-ex/contracts/src/features/ITransformERC20Feature.sol

@@ -58,10 +58,6 @@ interface ITransformERC20Feature {
         // The transformations to execute on the token balance(s)
         // in sequence.
         Transformation[] transformations;
-        // The hash of the calldata for the `transformERC20()` call.
-        bytes32 callDataHash;
-        // The signature for `callDataHash` signed by `getQuoteSigner()`.
-        bytes callDataSignature;
     }
 
     /// @dev Raised upon a successful `transformERC20`.

contracts/zero-ex/contracts/src/features/LiquidityProviderFeature.sol

@@ -26,16 +26,17 @@ import "../errors/LibLiquidityProviderRichErrors.sol";
 import "../external/ILiquidityProviderSandbox.sol";
 import "../external/LiquidityProviderSandbox.sol";
 import "../fixins/FixinCommon.sol";
+import "../fixins/FixinTokenSpender.sol";
 import "../migrations/LibMigrate.sol";
 import "./IFeature.sol";
 import "./ILiquidityProviderFeature.sol";
-import "./libs/LibTokenSpender.sol";
 
 
 contract LiquidityProviderFeature is
     IFeature,
     ILiquidityProviderFeature,
-    FixinCommon
+    FixinCommon,
+    FixinTokenSpender
 {
     using LibSafeMathV06 for uint256;
     using LibRichErrorsV06 for bytes;
@@ -43,7 +44,7 @@ contract LiquidityProviderFeature is
     /// @dev Name of this feature.
     string public constant override FEATURE_NAME = "LiquidityProviderFeature";
     /// @dev Version of this feature.
-    uint256 public immutable override FEATURE_VERSION = _encodeVersion(1, 0, 0);
+    uint256 public immutable override FEATURE_VERSION = _encodeVersion(1, 0, 2);
 
     /// @dev ETH pseudo-token address.
     address constant internal ETH_TOKEN_ADDRESS = 0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE;
@@ -60,11 +61,12 @@ contract LiquidityProviderFeature is
         address recipient
     );
 
-    constructor(address zeroEx)
+    constructor(LiquidityProviderSandbox sandbox_, bytes32 greedyTokensBloomFilter)
         public
         FixinCommon()
+        FixinTokenSpender(greedyTokensBloomFilter)
     {
-        sandbox = new LiquidityProviderSandbox(zeroEx);
+        sandbox = sandbox_;
     }
 
     /// @dev Initialize and register this feature.
@@ -109,10 +111,14 @@ contract LiquidityProviderFeature is
             recipient = msg.sender;
         }
 
-        if (inputToken == ETH_TOKEN_ADDRESS) {
-            provider.transfer(sellAmount);
-        } else {
-            LibTokenSpender.spendERC20Tokens(
+        // Forward all attached ETH to the provider.
+        if (msg.value > 0) {
+            provider.transfer(msg.value);
+        }
+
+        if (inputToken != ETH_TOKEN_ADDRESS) {
+            // Transfer input ERC20 tokens to the provider.
+            _transferERC20Tokens(
                 IERC20TokenV06(inputToken),
                 msg.sender,
                 provider,

contracts/zero-ex/contracts/src/features/MetaTransactionsFeature.sol

@@ -25,16 +25,16 @@ import "@0x/contracts-utils/contracts/src/v06/LibSafeMathV06.sol";
 import "../errors/LibMetaTransactionsRichErrors.sol";
 import "../fixins/FixinCommon.sol";
 import "../fixins/FixinReentrancyGuard.sol";
+import "../fixins/FixinTokenSpender.sol";
 import "../fixins/FixinEIP712.sol";
 import "../migrations/LibMigrate.sol";
 import "../storage/LibMetaTransactionsStorage.sol";
-import "./libs/LibSignedCallData.sol";
 import "./IMetaTransactionsFeature.sol";
 import "./ITransformERC20Feature.sol";
+import "./libs/LibSignature.sol";
 import "./ISignatureValidatorFeature.sol";
 import "./IFeature.sol";
-import "./libs/LibTokenSpender.sol";
-
+import "./INativeOrdersFeature.sol";
 
 /// @dev MetaTransactions feature.
 contract MetaTransactionsFeature is
@@ -42,13 +42,13 @@ contract MetaTransactionsFeature is
     IMetaTransactionsFeature,
     FixinCommon,
     FixinReentrancyGuard,
-    FixinEIP712
+    FixinEIP712,
+    FixinTokenSpender
 {
     using LibBytesV06 for bytes;
     using LibRichErrorsV06 for bytes;
 
-    /// @dev Intermediate state vars used by `_executeMetaTransactionPrivate()`
-    ///      to avoid stack overflows.
+    /// @dev Describes the state of a meta transaction.
     struct ExecuteState {
         // Sender of the meta-transaction.
         address sender;
@@ -57,7 +57,7 @@ contract MetaTransactionsFeature is
         // The meta-transaction data.
         MetaTransactionData mtx;
         // The meta-transaction signature (by `mtx.signer`).
-        bytes signature;
+        LibSignature.Signature signature;
         // The selector of the function being called.
         bytes4 selector;
         // The ETH balance of this contract before performing the call.
@@ -78,7 +78,7 @@ contract MetaTransactionsFeature is
     /// @dev Name of this feature.
     string public constant override FEATURE_NAME = "MetaTransactions";
     /// @dev Version of this feature.
-    uint256 public immutable override FEATURE_VERSION = _encodeVersion(1, 0, 0);
+    uint256 public immutable override FEATURE_VERSION = _encodeVersion(1, 1, 0);
     /// @dev EIP712 typehash of the `MetaTransactionData` struct.
     bytes32 public immutable MTX_EIP712_TYPEHASH = keccak256(
         "MetaTransactionData("
@@ -105,10 +105,11 @@ contract MetaTransactionsFeature is
         }
     }
 
-    constructor(address zeroExAddress)
+    constructor(address zeroExAddress, bytes32 greedyTokensBloomFilter)
         public
         FixinCommon()
         FixinEIP712(zeroExAddress)
+        FixinTokenSpender(greedyTokensBloomFilter)
     {
         // solhint-disable-next-line no-empty-blocks
     }
@@ -135,7 +136,7 @@ contract MetaTransactionsFeature is
     /// @return returnResult The ABI-encoded result of the underlying call.
     function executeMetaTransaction(
         MetaTransactionData memory mtx,
-        bytes memory signature
+        LibSignature.Signature memory signature
     )
         public
         payable
@@ -144,11 +145,13 @@ contract MetaTransactionsFeature is
         refundsAttachedEth
         returns (bytes memory returnResult)
     {
-        returnResult = _executeMetaTransactionPrivate(
-            msg.sender,
-            mtx,
-            signature
-        );
+        ExecuteState memory state;
+        state.sender = msg.sender;
+        state.mtx = mtx;
+        state.hash = getMetaTransactionHash(mtx);
+        state.signature = signature;
+
+        returnResult = _executeMetaTransactionPrivate(state);
     }
 
     /// @dev Execute multiple meta-transactions.
@@ -157,7 +160,7 @@ contract MetaTransactionsFeature is
     /// @return returnResults The ABI-encoded results of the underlying calls.
     function batchExecuteMetaTransactions(
         MetaTransactionData[] memory mtxs,
-        bytes[] memory signatures
+        LibSignature.Signature[] memory signatures
     )
         public
         payable
@@ -174,11 +177,13 @@ contract MetaTransactionsFeature is
         }
         returnResults = new bytes[](mtxs.length);
         for (uint256 i = 0; i < mtxs.length; ++i) {
-            returnResults[i] = _executeMetaTransactionPrivate(
-                msg.sender,
-                mtxs[i],
-                signatures[i]
-            );
+            ExecuteState memory state;
+            state.sender = msg.sender;
+            state.mtx = mtxs[i];
+            state.hash = getMetaTransactionHash(mtxs[i]);
+            state.signature = signatures[i];
+
+            returnResults[i] = _executeMetaTransactionPrivate(state);
         }
     }
 
@@ -191,7 +196,7 @@ contract MetaTransactionsFeature is
     function _executeMetaTransaction(
         address sender,
         MetaTransactionData memory mtx,
-        bytes memory signature
+        LibSignature.Signature memory signature
     )
         public
         payable
@@ -199,7 +204,13 @@ contract MetaTransactionsFeature is
         onlySelf
         returns (bytes memory returnResult)
     {
-        return _executeMetaTransactionPrivate(sender, mtx, signature);
+        ExecuteState memory state;
+        state.sender = sender;
+        state.mtx = mtx;
+        state.hash = getMetaTransactionHash(mtx);
+        state.signature = signature;
+
+        return _executeMetaTransactionPrivate(state);
     }
 
     /// @dev Get the block at which a meta-transaction has been executed.
@@ -251,24 +262,13 @@ contract MetaTransactionsFeature is
     }
 
     /// @dev Execute a meta-transaction by `sender`. Low-level, hidden variant.
-    /// @param sender Who is executing the meta-transaction..
-    /// @param mtx The meta-transaction.
-    /// @param signature The signature by `mtx.signer`.
+    /// @param state The `ExecuteState` for this metatransaction, with `sender`,
+    ///              `hash`, `mtx`, and `signature` fields filled.
     /// @return returnResult The ABI-encoded result of the underlying call.
-    function _executeMetaTransactionPrivate(
-        address sender,
-        MetaTransactionData memory mtx,
-        bytes memory signature
-    )
+    function _executeMetaTransactionPrivate(ExecuteState memory state)
         private
         returns (bytes memory returnResult)
     {
-        ExecuteState memory state;
-        state.sender = sender;
-        state.hash = getMetaTransactionHash(mtx);
-        state.mtx = mtx;
-        state.signature = signature;
-
         _validateMetaTransaction(state);
 
         // Mark the transaction executed by storing the block at which it was executed.
@@ -278,19 +278,23 @@ contract MetaTransactionsFeature is
             .mtxHashToExecutedBlockNumber[state.hash] = block.number;
 
         // Pay the fee to the sender.
-        if (mtx.feeAmount > 0) {
-            LibTokenSpender.spendERC20Tokens(
-                mtx.feeToken,
-                mtx.signer,
-                sender,
-                mtx.feeAmount
+        if (state.mtx.feeAmount > 0) {
+            _transferERC20Tokens(
+                state.mtx.feeToken,
+                state.mtx.signer,
+                state.sender,
+                state.mtx.feeAmount
             );
         }
 
         // Execute the call based on the selector.
-        state.selector = mtx.callData.readBytes4(0);
+        state.selector = state.mtx.callData.readBytes4(0);
         if (state.selector == ITransformERC20Feature.transformERC20.selector) {
             returnResult = _executeTransformERC20Call(state);
+        } else if (state.selector == INativeOrdersFeature.fillLimitOrder.selector) {
+            returnResult = _executeFillLimitOrderCall(state);
+        } else if (state.selector == INativeOrdersFeature.fillRfqOrder.selector) {
+            returnResult = _executeFillRfqOrderCall(state);
         } else {
             LibMetaTransactionsRichErrors
                 .MetaTransactionUnsupportedFunctionError(state.hash, state.selector)
@@ -299,8 +303,8 @@ contract MetaTransactionsFeature is
         emit MetaTransactionExecuted(
             state.hash,
             state.selector,
-            mtx.signer,
-            mtx.sender
+            state.mtx.signer,
+            state.mtx.sender
         );
     }
 
@@ -347,18 +351,17 @@ contract MetaTransactionsFeature is
                     state.mtx.value
                 ).rrevert();
         }
-        // Must be signed by signer.
-        try
-            ISignatureValidatorFeature(address(this))
-                .validateHashSignature(state.hash, state.mtx.signer, state.signature)
-        {}
-        catch (bytes memory err) {
-            LibMetaTransactionsRichErrors
-                .MetaTransactionInvalidSignatureError(
-                    state.hash,
-                    state.signature,
-                    err
-                ).rrevert();
+
+        if (LibSignature.getSignerOfHash(state.hash, state.signature) !=
+                state.mtx.signer) {
+            LibSignatureRichErrors.SignatureValidationError(
+                LibSignatureRichErrors.SignatureValidationErrorCodes.WRONG_SIGNER,
+                state.hash,
+                state.mtx.signer,
+                // TODO: Remove this field from SignatureValidationError
+                //       when rich reverts are part of the protocol repo.
+                ""
+            ).rrevert();
         }
         // Transaction must not have been already executed.
         state.executedBlockNumber = LibMetaTransactionsStorage
@@ -429,10 +432,6 @@ contract MetaTransactionsFeature is
             // Decode call args for `ITransformERC20Feature.transformERC20()` as a struct.
             args = abi.decode(encodedStructArgs, (ExternalTransformERC20Args));
         }
-        // Parse the signature and hash out of the calldata so `_transformERC20()`
-        // can authenticate it.
-        (bytes32 callDataHash, bytes memory callDataSignature) =
-            LibSignedCallData.parseCallData(state.mtx.callData);
         // Call `ITransformERC20Feature._transformERC20()` (internal variant).
         return _callSelf(
             state.hash,
@@ -444,15 +443,95 @@ contract MetaTransactionsFeature is
                     outputToken: args.outputToken,
                     inputTokenAmount: args.inputTokenAmount,
                     minOutputTokenAmount: args.minOutputTokenAmount,
-                    transformations: args.transformations,
-                    callDataHash: callDataHash,
-                    callDataSignature: callDataSignature
+                    transformations: args.transformations
               })
             ),
             state.mtx.value
         );
     }
 
+    /// @dev Extract arguments from call data by copying everything after the
+    ///      4-byte selector into a new byte array.
+    /// @param callData The call data from which arguments are to be extracted.
+    /// @return args The extracted arguments as a byte array.
+    function _extractArgumentsFromCallData(
+        bytes memory callData
+    )
+        private
+        pure
+        returns (bytes memory args)
+    {
+        args = new bytes(callData.length - 4);
+        uint256 fromMem;
+        uint256 toMem;
+
+        assembly {
+            fromMem := add(callData, 36) // skip length and 4-byte selector
+            toMem := add(args, 32)       // write after length prefix
+        }
+
+        LibBytesV06.memCopy(toMem, fromMem, args.length);
+
+        return args;
+    }
+
+    /// @dev Execute a `INativeOrdersFeature.fillLimitOrder()` meta-transaction call
+    ///      by decoding the call args and translating the call to the internal
+    ///      `INativeOrdersFeature._fillLimitOrder()` variant, where we can override
+    ///      the taker address.
+    function _executeFillLimitOrderCall(ExecuteState memory state)
+        private
+        returns (bytes memory returnResult)
+    {
+        LibNativeOrder.LimitOrder memory order;
+        LibSignature.Signature memory signature;
+        uint128 takerTokenFillAmount;
+
+        bytes memory args = _extractArgumentsFromCallData(state.mtx.callData);
+        (order, signature, takerTokenFillAmount) = abi.decode(args, (LibNativeOrder.LimitOrder, LibSignature.Signature, uint128));
+
+        return _callSelf(
+            state.hash,
+            abi.encodeWithSelector(
+                INativeOrdersFeature._fillLimitOrder.selector,
+                order,
+                signature,
+                takerTokenFillAmount,
+                state.mtx.signer, // taker is mtx signer
+                msg.sender
+            ),
+            state.mtx.value
+        );
+    }
+
+    /// @dev Execute a `INativeOrdersFeature.fillRfqOrder()` meta-transaction call
+    ///      by decoding the call args and translating the call to the internal
+    ///      `INativeOrdersFeature._fillRfqOrder()` variant, where we can overrideunimpleme
+    ///      the taker address.
+    function _executeFillRfqOrderCall(ExecuteState memory state)
+        private
+        returns (bytes memory returnResult)
+    {
+        LibNativeOrder.RfqOrder memory order;
+        LibSignature.Signature memory signature;
+        uint128 takerTokenFillAmount;
+
+        bytes memory args = _extractArgumentsFromCallData(state.mtx.callData);
+        (order, signature, takerTokenFillAmount) = abi.decode(args, (LibNativeOrder.RfqOrder, LibSignature.Signature, uint128));
+
+        return _callSelf(
+            state.hash,
+            abi.encodeWithSelector(
+                INativeOrdersFeature._fillRfqOrder.selector,
+                order,
+                signature,
+                takerTokenFillAmount,
+                state.mtx.signer // taker is mtx signer
+            ),
+            state.mtx.value
+        );
+    }
+
     /// @dev Make an arbitrary internal, meta-transaction call.
     ///      Warning: Do not let unadulterated `callData` into this function.
     function _callSelf(bytes32 hash, bytes memory callData, uint256 value)

contracts/zero-ex/contracts/src/features/SimpleFunctionRegistryFeature.sol

@@ -56,7 +56,6 @@ contract SimpleFunctionRegistryFeature is
         // Register getters.
         _extend(this.getRollbackLength.selector, _implementation);
         _extend(this.getRollbackEntryAtIndex.selector, _implementation);
-        _extend(this.getFunctionImplementation.selector, _implementation);
         return LibBootstrap.BOOTSTRAP_SUCCESS;
     }
 
@@ -152,18 +151,6 @@ contract SimpleFunctionRegistryFeature is
         return LibSimpleFunctionRegistryStorage.getStorage().implHistory[selector][idx];
     }
 
-    /// @dev Get the implementation contract of a registered function.
-    /// @param selector The function selector.
-    /// @return impl The implementation contract address.
-    function getFunctionImplementation(bytes4 selector)
-        external
-        override
-        view
-        returns (address impl)
-    {
-        return LibProxyStorage.getStorage().impls[selector];
-    }
-
     /// @dev Register or replace a function.
     /// @param selector The function selector.
     /// @param impl The implementation contract for the function.

contracts/zero-ex/contracts/src/features/TransformERC20Feature.sol

@@ -25,24 +25,24 @@ import "@0x/contracts-utils/contracts/src/v06/errors/LibRichErrorsV06.sol";
 import "@0x/contracts-utils/contracts/src/v06/LibSafeMathV06.sol";
 import "../errors/LibTransformERC20RichErrors.sol";
 import "../fixins/FixinCommon.sol";
+import "../fixins/FixinTokenSpender.sol";
 import "../migrations/LibMigrate.sol";
 import "../external/IFlashWallet.sol";
 import "../external/FlashWallet.sol";
 import "../storage/LibTransformERC20Storage.sol";
 import "../transformers/IERC20Transformer.sol";
 import "../transformers/LibERC20Transformer.sol";
-import "./libs/LibSignedCallData.sol";
 import "./ITransformERC20Feature.sol";
 import "./IFeature.sol";
 import "./ISignatureValidatorFeature.sol";
-import "./libs/LibTokenSpender.sol";
 
 
 /// @dev Feature to composably transform between ERC20 tokens.
 contract TransformERC20Feature is
     IFeature,
     ITransformERC20Feature,
-    FixinCommon
+    FixinCommon,
+    FixinTokenSpender
 {
     using LibSafeMathV06 for uint256;
     using LibRichErrorsV06 for bytes;
@@ -58,7 +58,12 @@ contract TransformERC20Feature is
     /// @dev Name of this feature.
     string public constant override FEATURE_NAME = "TransformERC20";
     /// @dev Version of this feature.
-    uint256 public immutable override FEATURE_VERSION = _encodeVersion(1, 3, 0);
+    uint256 public immutable override FEATURE_VERSION = _encodeVersion(1, 3, 1);
+
+    constructor(bytes32 greedyTokensBloomFilter)
+        public
+        FixinTokenSpender(greedyTokensBloomFilter)
+    {}
 
     /// @dev Initialize and register this feature.
     ///      Should be delegatecalled by `Migrate.migrate()`.
@@ -171,8 +176,6 @@ contract TransformERC20Feature is
         payable
         returns (uint256 outputTokenAmount)
     {
-        (bytes32 callDataHash, bytes memory callDataSignature) =
-            LibSignedCallData.parseCallData(msg.data);
         return _transformERC20Private(
             TransformERC20Args({
                 taker: msg.sender,
@@ -180,9 +183,7 @@ contract TransformERC20Feature is
                 outputToken: outputToken,
                 inputTokenAmount: inputTokenAmount,
                 minOutputTokenAmount: minOutputTokenAmount,
-                transformations: transformations,
-                callDataHash: callDataHash,
-                callDataSignature: callDataSignature
+                transformations: transformations
             })
         );
     }
@@ -208,13 +209,19 @@ contract TransformERC20Feature is
         private
         returns (uint256 outputTokenAmount)
     {
-        // If the input token amount is -1, transform the taker's entire
-        // spendable balance.
+        // If the input token amount is -1 and we are not selling ETH,
+        // transform the taker's entire spendable balance.
         if (args.inputTokenAmount == uint256(-1)) {
-            args.inputTokenAmount = LibTokenSpender.getSpendableERC20BalanceOf(
-                args.inputToken,
-                args.taker
-            );
+            if (LibERC20Transformer.isTokenETH(args.inputToken)) {
+                // We can't pull more ETH from the taker, so we just set the
+                // input token amount to the value attached to the call.
+                args.inputTokenAmount = msg.value;
+            } else {
+                args.inputTokenAmount = _getSpendableERC20BalanceOf(
+                    args.inputToken,
+                    args.taker
+                );
+            }
         }
 
         TransformERC20PrivateState memory state;
@@ -234,22 +241,13 @@ contract TransformERC20Feature is
         );
 
         {
-            // Validate that the calldata was signed by the quote signer.
-            // `validCallDataHash` will be 0x0 if not.
-            bytes32 validCallDataHash = _getValidCallDataHash(
-                args.callDataHash,
-                args.callDataSignature
-            );
             // Perform transformations.
             for (uint256 i = 0; i < args.transformations.length; ++i) {
                 _executeTransformation(
                     state.wallet,
                     args.transformations[i],
                     state.transformerDeployer,
-                    args.taker,
-                    // Transformers will receive a null calldata hash if
-                    // the calldata was not properly signed.
-                    validCallDataHash
+                    args.taker
                 );
             }
         }
@@ -317,7 +315,12 @@ contract TransformERC20Feature is
         // Transfer input tokens.
         if (!LibERC20Transformer.isTokenETH(inputToken)) {
             // Token is not ETH, so pull ERC20 tokens.
-            LibTokenSpender.spendERC20Tokens(inputToken, from, to, amount);
+            _transferERC20Tokens(
+                inputToken,
+                from,
+                to,
+                amount
+            );
         } else if (msg.value < amount) {
              // Token is ETH, so the caller must attach enough ETH to the call.
             LibTransformERC20RichErrors.InsufficientEthAttachedError(
@@ -332,13 +335,11 @@ contract TransformERC20Feature is
     /// @param transformation The transformation.
     /// @param transformerDeployer The address of the transformer deployer.
     /// @param taker The taker address.
-    /// @param callDataHash Hash of the calldata.
     function _executeTransformation(
         IFlashWallet wallet,
         Transformation memory transformation,
         address transformerDeployer,
-        address payable taker,
-        bytes32 callDataHash
+        address payable taker
     )
         private
     {
@@ -355,7 +356,6 @@ contract TransformERC20Feature is
             abi.encodeWithSelector(
                 IERC20Transformer.transform.selector,
                 IERC20Transformer.TransformContext({
-                    callDataHash: callDataHash,
                     sender: msg.sender,
                     taker: taker,
                     data: transformation.data

contracts/zero-ex/contracts/src/features/UniswapFeature.sol

@@ -37,7 +37,9 @@ contract UniswapFeature is
     /// @dev Name of this feature.
     string public constant override FEATURE_NAME = "UniswapFeature";
     /// @dev Version of this feature.
-    uint256 public immutable override FEATURE_VERSION = _encodeVersion(1, 1, 0);
+    uint256 public immutable override FEATURE_VERSION = _encodeVersion(1, 1, 1);
+    /// @dev A bloom filter for tokens that consume all gas when `transferFrom()` fails.
+    bytes32 public immutable GREEDY_TOKENS_BLOOM_FILTER;
     /// @dev WETH contract.
     IEtherTokenV06 private immutable WETH;
     /// @dev AllowanceTarget instance.
@@ -66,6 +68,8 @@ contract UniswapFeature is
     uint256 constant private UNISWAP_PAIR_SWAP_CALL_SELECTOR_32 = 0x022c0d9f00000000000000000000000000000000000000000000000000000000;
     // bytes4(keccak256("transferFrom(address,address,uint256)"))
     uint256 constant private TRANSFER_FROM_CALL_SELECTOR_32 = 0x23b872dd00000000000000000000000000000000000000000000000000000000;
+    // bytes4(keccak256("allowance(address,address)"))
+    uint256 constant private ALLOWANCE_CALL_SELECTOR_32 = 0xdd62ed3e00000000000000000000000000000000000000000000000000000000;
     // bytes4(keccak256("withdraw(uint256)"))
     uint256 constant private WETH_WITHDRAW_CALL_SELECTOR_32 = 0x2e1a7d4d00000000000000000000000000000000000000000000000000000000;
     // bytes4(keccak256("deposit()"))
@@ -76,9 +80,15 @@ contract UniswapFeature is
     /// @dev Construct this contract.
     /// @param weth The WETH contract.
     /// @param allowanceTarget The AllowanceTarget contract.
-    constructor(IEtherTokenV06 weth, IAllowanceTarget allowanceTarget) public {
+    /// @param greedyTokensBloomFilter The bloom filter for greedy tokens.
+    constructor(
+        IEtherTokenV06 weth,
+        IAllowanceTarget allowanceTarget,
+        bytes32 greedyTokensBloomFilter
+    ) public {
         WETH = weth;
         ALLOWANCE_TARGET = allowanceTarget;
+        GREEDY_TOKENS_BLOOM_FILTER = greedyTokensBloomFilter;
     }
 
     /// @dev Initialize and register this feature.
@@ -114,6 +124,7 @@ contract UniswapFeature is
             // Load immutables onto the stack.
             IEtherTokenV06 weth = WETH;
             IAllowanceTarget allowanceTarget = ALLOWANCE_TARGET;
+            bytes32 greedyTokensBloomFilter = GREEDY_TOKENS_BLOOM_FILTER;
 
             // Store some vars in memory to get around stack limits.
             assembly {
@@ -125,6 +136,8 @@ contract UniswapFeature is
                 mstore(0xA40, weth)
                 // mload(0xA60) == ALLOWANCE_TARGET
                 mstore(0xA60, allowanceTarget)
+                // mload(0xA80) == GREEDY_TOKENS_BLOOM_FILTER
+                mstore(0xA80, greedyTokensBloomFilter)
             }
         }
 
@@ -154,53 +167,16 @@ contract UniswapFeature is
                 }
 
                 if iszero(i) {
+                    // This is the first token in the path.
                     switch eq(sellToken, ETH_TOKEN_ADDRESS_32)
-                        case 0 {
+                        case 0 { // Not selling ETH. Selling an ERC20 instead.
+                            // Make sure ETH was not attached to the call.
+                            if gt(callvalue(), 0) {
+                                revert(0, 0)
+                            }
                             // For the first pair we need to transfer sellTokens into the
                             // pair contract.
-                            mstore(0xB00, TRANSFER_FROM_CALL_SELECTOR_32)
-                            mstore(0xB04, caller())
-                            mstore(0xB24, pair)
-                            mstore(0xB44, sellAmount)
-
-                            // Copy only the first 32 bytes of return data. We
-                            // only care about reading a boolean in the success
-                            // case, and we discard the return data in the
-                            // failure case.
-                            let success := call(gas(), sellToken, 0, 0xB00, 0x64, 0xC00, 0x20)
-
-                            let rdsize := returndatasize()
-
-                            // Check for ERC20 success. ERC20 tokens should
-                            // return a boolean, but some return nothing or
-                            // extra data. We accept 0-length return data as
-                            // success, or at least 32 bytes that starts with
-                            // a 32-byte boolean true.
-                            success := and(
-                                success,                         // call itself succeeded
-                                or(
-                                    iszero(rdsize),              // no return data, or
-                                    and(
-                                        iszero(lt(rdsize, 32)),  // at least 32 bytes
-                                        eq(mload(0xC00), 1)      // starts with uint256(1)
-                                    )
-                                )
-                            )
-
-                            if iszero(success) {
-                                // Try to fall back to the allowance target.
-                                mstore(0xB00, ALLOWANCE_TARGET_EXECUTE_CALL_SELECTOR_32)
-                                mstore(0xB04, sellToken)
-                                mstore(0xB24, 0x40)
-                                mstore(0xB44, 0x64)
-                                mstore(0xB64, TRANSFER_FROM_CALL_SELECTOR_32)
-                                mstore(0xB68, caller())
-                                mstore(0xB88, pair)
-                                mstore(0xBA8, sellAmount)
-                                if iszero(call(gas(), mload(0xA60), 0, 0xB00, 0xC8, 0x00, 0x0)) {
-                                    bubbleRevert()
-                                }
-                            }
+                            moveTakerTokensTo(sellToken, pair, sellAmount)
                         }
                         default {
                             // If selling ETH, we need to wrap it to WETH and transfer to the
@@ -232,6 +208,10 @@ contract UniswapFeature is
                 if iszero(staticcall(gas(), pair, 0xB00, 0x4, 0xC00, 0x40)) {
                     bubbleRevert()
                 }
+                // Revert if the pair contract does not return two words.
+                if iszero(eq(returndatasize(), 0x40)) {
+                    revert(0,0)
+                }
 
                 // Sell amount for this hop is the previous buy amount.
                 let pairSellAmount := buyAmount
@@ -389,6 +369,110 @@ contract UniswapFeature is
                 returndatacopy(0, 0, returndatasize())
                 revert(0, returndatasize())
             }
+
+            // Move `amount` tokens from the taker/caller to `to`.
+            function moveTakerTokensTo(token, to, amount) {
+
+                // If the token is possibly greedy, we check the allowance rather
+                // than relying on letting the transferFrom() call fail and
+                // falling through to legacy allowance target because the token
+                // will eat all our gas.
+                if isTokenPossiblyGreedy(token) {
+                    // Check if we have enough direct allowance by calling
+                    // `token.allowance()``
+                    mstore(0xB00, ALLOWANCE_CALL_SELECTOR_32)
+                    mstore(0xB04, caller())
+                    mstore(0xB24, address())
+                    let success := staticcall(gas(), token, 0xB00, 0x44, 0xC00, 0x20)
+                    if iszero(success) {
+                        // Call to allowance() failed.
+                        bubbleRevert()
+                    }
+                    // Make sure the allowance call returned a single word.
+                    if iszero(eq(returndatasize(), 0x20)) {
+                        revert(0, 0)
+                    }
+                    // Call succeeded.
+                    // Result is stored in 0xC00-0xC20.
+                    if lt(mload(0xC00), amount) {
+                        // We don't have enough direct allowance, so try
+                        // going through the legacy allowance taregt.
+                        moveTakerTokensToWithLegacyAllowanceTarget(token, to, amount)
+                        leave
+                    }
+                }
+
+                // Otherwise we will optimistically try to perform a `transferFrom()`
+                // directly then if it fails we will go through the legacy allowance target.
+                mstore(0xB00, TRANSFER_FROM_CALL_SELECTOR_32)
+                mstore(0xB04, caller())
+                mstore(0xB24, to)
+                mstore(0xB44, amount)
+
+                let success := call(
+                    gas(),
+                    token,
+                    0,
+                    0xB00,
+                    0x64,
+                    0xC00,
+                    // Copy only the first 32 bytes of return data. We
+                    // only care about reading a boolean in the success
+                    // case, and we discard the return data in the
+                    // failure case.
+                    0x20
+                )
+
+                let rdsize := returndatasize()
+
+                // Check for ERC20 success. ERC20 tokens should
+                // return a boolean, but some return nothing or
+                // extra data. We accept 0-length return data as
+                // success, or at least 32 bytes that starts with
+                // a 32-byte boolean true.
+                success := and(
+                    success,                         // call itself succeeded
+                    or(
+                        iszero(rdsize),              // no return data, or
+                        and(
+                            iszero(lt(rdsize, 32)),  // at least 32 bytes
+                            eq(mload(0xC00), 1)      // starts with uint256(1)
+                        )
+                    )
+                )
+
+                if iszero(success) {
+                    // Try to fall back to the allowance target.
+                    moveTakerTokensToWithLegacyAllowanceTarget(token, to, amount)
+                }
+            }
+
+            // Move tokens by going through the legacy allowance target contract.
+            function moveTakerTokensToWithLegacyAllowanceTarget(token, to, amount) {
+                mstore(0xB00, ALLOWANCE_TARGET_EXECUTE_CALL_SELECTOR_32)
+                mstore(0xB04, token)
+                mstore(0xB24, 0x40)
+                mstore(0xB44, 0x64)
+                mstore(0xB64, TRANSFER_FROM_CALL_SELECTOR_32)
+                mstore(0xB68, caller())
+                mstore(0xB88, to)
+                mstore(0xBA8, amount)
+                if iszero(call(gas(), mload(0xA60), 0, 0xB00, 0xC8, 0x00, 0x0)) {
+                    bubbleRevert()
+                }
+                // If this fall back failed, the swap will most likely fail
+                // so there's no need to validate the result.
+            }
+
+            // Checks if a token possibly belongs to the GREEDY_TOKENS_BLOOM_FILTER
+            // bloom filter.
+            function isTokenPossiblyGreedy(token) -> isPossiblyGreedy {
+                // The hash is given by:
+                // (1 << (keccak256(token) % 256)) | (1 << (token % 256))
+                mstore(0, token)
+                let h := or(shl(mod(keccak256(0, 32), 256), 1), shl(mod(token, 256), 1))
+                isPossiblyGreedy := eq(and(h, mload(0xA80)), h)
+            }
         }
 
         // Revert if we bought too little.

contracts/zero-ex/contracts/src/features/libs/LibNativeOrder.sol

@@ -0,0 +1,218 @@
+/*
+
+  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;
+pragma experimental ABIEncoderV2;
+
+import "@0x/contracts-erc20/contracts/src/v06/IERC20TokenV06.sol";
+
+
+/// @dev A library for common native order operations.
+library LibNativeOrder {
+
+    enum OrderStatus {
+        INVALID,
+        FILLABLE,
+        FILLED,
+        CANCELLED,
+        EXPIRED
+    }
+
+    /// @dev A standard OTC or OO limit order.
+    struct LimitOrder {
+        IERC20TokenV06 makerToken;
+        IERC20TokenV06 takerToken;
+        uint128 makerAmount;
+        uint128 takerAmount;
+        uint128 takerTokenFeeAmount;
+        address maker;
+        address taker;
+        address sender;
+        address feeRecipient;
+        bytes32 pool;
+        uint64 expiry;
+        uint256 salt;
+    }
+
+    /// @dev An RFQ limit order.
+    struct RfqOrder {
+        IERC20TokenV06 makerToken;
+        IERC20TokenV06 takerToken;
+        uint128 makerAmount;
+        uint128 takerAmount;
+        address maker;
+        address taker;
+        address txOrigin;
+        bytes32 pool;
+        uint64 expiry;
+        uint256 salt;
+    }
+
+    /// @dev Info on a limit or RFQ order.
+    struct OrderInfo {
+        bytes32 orderHash;
+        OrderStatus status;
+        uint128 takerTokenFilledAmount;
+    }
+
+    uint256 private constant UINT_128_MASK = (1 << 128) - 1;
+    uint256 private constant UINT_64_MASK = (1 << 64) - 1;
+    uint256 private constant ADDRESS_MASK = (1 << 160) - 1;
+
+    // The type hash for limit orders, which is:
+    // keccak256(abi.encodePacked(
+    //     "LimitOrder(",
+    //       "address makerToken,",
+    //       "address takerToken,",
+    //       "uint128 makerAmount,",
+    //       "uint128 takerAmount,",
+    //       "uint128 takerTokenFeeAmount,",
+    //       "address maker,",
+    //       "address taker,",
+    //       "address sender,",
+    //       "address feeRecipient,",
+    //       "bytes32 pool,",
+    //       "uint64 expiry,",
+    //       "uint256 salt"
+    //     ")"
+    // ))
+    uint256 private constant _LIMIT_ORDER_TYPEHASH =
+        0xce918627cb55462ddbb85e73de69a8b322f2bc88f4507c52fcad6d4c33c29d49;
+
+    // The type hash for RFQ orders, which is:
+    // keccak256(abi.encodePacked(
+    //     "RfqOrder(",
+    //       "address makerToken,",
+    //       "address takerToken,",
+    //       "uint128 makerAmount,",
+    //       "uint128 takerAmount,",
+    //       "address maker,",
+    //       "address txOrigin,",
+    //       "address taker,",
+    //       "bytes32 pool,",
+    //       "uint64 expiry,",
+    //       "uint256 salt"
+    //     ")"
+    // ))
+    uint256 private constant _RFQ_ORDER_TYPEHASH =
+        0xe593d3fdfa8b60e5e17a1b2204662ecbe15c23f2084b9ad5bae40359540a7da9;
+
+    /// @dev Get the struct hash of a limit order.
+    /// @param order The limit order.
+    /// @return structHash The struct hash of the order.
+    function getLimitOrderStructHash(LimitOrder memory order)
+        internal
+        pure
+        returns (bytes32 structHash)
+    {
+        // The struct hash is:
+        // keccak256(abi.encode(
+        //   TYPE_HASH,
+        //   order.makerToken,
+        //   order.takerToken,
+        //   order.makerAmount,
+        //   order.takerAmount,
+        //   order.takerTokenFeeAmount,
+        //   order.maker,
+        //   order.taker,
+        //   order.sender,
+        //   order.feeRecipient,
+        //   order.pool,
+        //   order.expiry,
+        //   order.salt,
+        // ))
+        assembly {
+            let mem := mload(0x40)
+            mstore(mem, _LIMIT_ORDER_TYPEHASH)
+            // order.makerToken;
+            mstore(add(mem, 0x20), and(ADDRESS_MASK, mload(order)))
+            // order.takerToken;
+            mstore(add(mem, 0x40), and(ADDRESS_MASK, mload(add(order, 0x20))))
+            // order.makerAmount;
+            mstore(add(mem, 0x60), and(UINT_128_MASK, mload(add(order, 0x40))))
+            // order.takerAmount;
+            mstore(add(mem, 0x80), and(UINT_128_MASK, mload(add(order, 0x60))))
+            // order.takerTokenFeeAmount;
+            mstore(add(mem, 0xA0), and(UINT_128_MASK, mload(add(order, 0x80))))
+            // order.maker;
+            mstore(add(mem, 0xC0), and(ADDRESS_MASK, mload(add(order, 0xA0))))
+            // order.taker;
+            mstore(add(mem, 0xE0), and(ADDRESS_MASK, mload(add(order, 0xC0))))
+            // order.sender;
+            mstore(add(mem, 0x100), and(ADDRESS_MASK, mload(add(order, 0xE0))))
+            // order.feeRecipient;
+            mstore(add(mem, 0x120), and(ADDRESS_MASK, mload(add(order, 0x100))))
+            // order.pool;
+            mstore(add(mem, 0x140), mload(add(order, 0x120)))
+            // order.expiry;
+            mstore(add(mem, 0x160), and(UINT_64_MASK, mload(add(order, 0x140))))
+            // order.salt;
+            mstore(add(mem, 0x180), mload(add(order, 0x160)))
+            structHash := keccak256(mem, 0x1A0)
+        }
+    }
+
+    /// @dev Get the struct hash of a RFQ order.
+    /// @param order The RFQ order.
+    /// @return structHash The struct hash of the order.
+    function getRfqOrderStructHash(RfqOrder memory order)
+        internal
+        pure
+        returns (bytes32 structHash)
+    {
+        // The struct hash is:
+        // keccak256(abi.encode(
+        //   TYPE_HASH,
+        //   order.makerToken,
+        //   order.takerToken,
+        //   order.makerAmount,
+        //   order.takerAmount,
+        //   order.maker,
+        //   order.taker,
+        //   order.txOrigin,
+        //   order.pool,
+        //   order.expiry,
+        //   order.salt,
+        // ))
+        assembly {
+            let mem := mload(0x40)
+            mstore(mem, _RFQ_ORDER_TYPEHASH)
+            // order.makerToken;
+            mstore(add(mem, 0x20), and(ADDRESS_MASK, mload(order)))
+            // order.takerToken;
+            mstore(add(mem, 0x40), and(ADDRESS_MASK, mload(add(order, 0x20))))
+            // order.makerAmount;
+            mstore(add(mem, 0x60), and(UINT_128_MASK, mload(add(order, 0x40))))
+            // order.takerAmount;
+            mstore(add(mem, 0x80), and(UINT_128_MASK, mload(add(order, 0x60))))
+            // order.maker;
+            mstore(add(mem, 0xA0), and(ADDRESS_MASK, mload(add(order, 0x80))))
+            // order.taker;
+            mstore(add(mem, 0xC0), and(ADDRESS_MASK, mload(add(order, 0xA0))))
+            // order.txOrigin;
+            mstore(add(mem, 0xE0), and(ADDRESS_MASK, mload(add(order, 0xC0))))
+            // order.pool;
+            mstore(add(mem, 0x100), mload(add(order, 0xE0)))
+            // order.expiry;
+            mstore(add(mem, 0x120), and(UINT_64_MASK, mload(add(order, 0x100))))
+            // order.salt;
+            mstore(add(mem, 0x140), mload(add(order, 0x120)))
+            structHash := keccak256(mem, 0x160)
+        }
+    }
+}

contracts/zero-ex/contracts/src/features/libs/LibSignature.sol

@@ -38,7 +38,7 @@ library LibSignature {
     ///      The valid range is given by fig (283) of the yellow paper.
     uint256 private constant ECDSA_SIGNATURE_S_LIMIT = ECDSA_SIGNATURE_R_LIMIT / 2 + 1;
 
-   /// @dev Allowed signature types.
+    /// @dev Allowed signature types.
     enum SignatureType {
         ILLEGAL,
         INVALID,

contracts/zero-ex/contracts/src/features/libs/LibSignedCallData.sol

@@ -1,72 +0,0 @@
-/*
-
-  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;
-pragma experimental ABIEncoderV2;
-
-import "@0x/contracts-utils/contracts/src/v06/LibBytesV06.sol";
-
-
-/// @dev Library for working with signed calldata.
-library LibSignedCallData {
-    using LibBytesV06 for bytes;
-
-    // bytes4(keccak256('SignedCallDataSignature(bytes)'))
-    bytes4 constant private SIGNATURE_SELECTOR = 0xf86d1d92;
-
-    /// @dev Try to parse potentially signed calldata into its hash and signature
-    ///      components. Signed calldata has signature data appended to it.
-    /// @param callData the raw call data.
-    /// @return callDataHash If a signature is detected, this will be the hash of
-    ///         the bytes preceding the signature data. Otherwise, this
-    ///         will be the hash of the entire `callData`.
-    /// @return signature The signature bytes, if present.
-    function parseCallData(bytes memory callData)
-        internal
-        pure
-        returns (bytes32 callDataHash, bytes memory signature)
-    {
-        // Signed calldata has a 70 byte signature appended as:
-        // ```
-        //   abi.encodePacked(
-        //     callData,
-        //     bytes4(keccak256('SignedCallDataSignature(bytes)')),
-        //     signature // 66 bytes
-        //   );
-        // ```
-
-        // Try to detect an appended signature. This isn't foolproof, but an
-        // accidental false positive should highly unlikely. Additinally, the
-        // signature would also have to pass verification, so the risk here is
-        // low.
-        if (
-            // Signed callData has to be at least 70 bytes long.
-            callData.length < 70 ||
-            // The bytes4 at offset -70 should equal `SIGNATURE_SELECTOR`.
-            SIGNATURE_SELECTOR != callData.readBytes4(callData.length - 70)
-        ) {
-            return (keccak256(callData), signature);
-        }
-        // Consider everything before the signature selector as the original
-        // calldata and everything after as the signature.
-        assembly {
-            callDataHash := keccak256(add(callData, 32), sub(mload(callData), 70))
-        }
-        signature = callData.slice(callData.length - 66, callData.length);
-    }
-}

contracts/zero-ex/contracts/src/fixins/FixinProtocolFees.sol

@@ -21,72 +21,74 @@ pragma experimental ABIEncoderV2;
 
 import "@0x/contracts-erc20/contracts/src/v06/IEtherTokenV06.sol";
 import "../external/FeeCollector.sol";
-import "../features/libs/LibTokenSpender.sol";
+import "../external/FeeCollectorController.sol";
+import "../external/LibFeeCollector.sol";
+import "../vendor/v3/IStaking.sol";
+
 
 /// @dev Helpers for collecting protocol fees.
 abstract contract FixinProtocolFees {
-    bytes32 immutable feeCollectorCodeHash;
 
-    constructor() internal {
-        feeCollectorCodeHash = keccak256(type(FeeCollector).creationCode);
-    }
+    /// @dev The protocol fee multiplier.
+    uint32 public immutable PROTOCOL_FEE_MULTIPLIER;
+    /// @dev The `FeeCollectorController` contract.
+    FeeCollectorController private immutable FEE_COLLECTOR_CONTROLLER;
+    /// @dev Hash of the fee collector init code.
+    bytes32 private immutable FEE_COLLECTOR_INIT_CODE_HASH;
+    /// @dev The WETH token contract.
+    IEtherTokenV06 private immutable WETH;
+    /// @dev The staking contract.
+    IStaking private immutable STAKING;
 
-    /// @dev   Collect the specified protocol fee in either WETH or ETH. If
-    ///        msg.value is non-zero, the fee will be paid in ETH. Otherwise,
-    ///        this function attempts to transfer the fee in WETH. Either way,
-    ///        The fee is stored in a per-pool fee collector contract.
-    /// @param poolId The pool ID for which a fee is being collected.
-    /// @param amount The amount of ETH/WETH to be collected.
-    /// @param weth The WETH token contract.
-    function _collectProtocolFee(
-        bytes32 poolId,
-        uint256 amount,
-        IERC20TokenV06 weth
+    constructor(
+        IEtherTokenV06 weth,
+        IStaking staking,
+        FeeCollectorController feeCollectorController,
+        uint32 protocolFeeMultiplier
     )
         internal
     {
-        FeeCollector feeCollector = _getFeeCollector(poolId);
+        FEE_COLLECTOR_CONTROLLER = feeCollectorController;
+        FEE_COLLECTOR_INIT_CODE_HASH =
+            feeCollectorController.FEE_COLLECTOR_INIT_CODE_HASH();
+        WETH = weth;
+        STAKING = staking;
+        PROTOCOL_FEE_MULTIPLIER = protocolFeeMultiplier;
+    }
 
-        if (msg.value == 0) {
-            // WETH
-            LibTokenSpender.spendERC20Tokens(weth, msg.sender, address(feeCollector), amount);
-        } else {
-            // ETH
-            (bool success,) = address(feeCollector).call{value: amount}("");
-            require(success, "FixinProtocolFees/ETHER_TRANSFER_FALIED");
+    /// @dev   Collect the specified protocol fee in ETH.
+    ///        The fee is stored in a per-pool fee collector contract.
+    /// @param poolId The pool ID for which a fee is being collected.
+    /// @return ethProtocolFeePaid How much protocol fee was collected in ETH.
+    function _collectProtocolFee(bytes32 poolId)
+        internal
+        returns (uint256 ethProtocolFeePaid)
+    {
+        uint256 protocolFeePaid = _getSingleProtocolFee();
+        if (protocolFeePaid == 0) {
+            // Nothing to do.
+            return 0;
         }
+        FeeCollector feeCollector = _getFeeCollector(poolId);
+        (bool success,) = address(feeCollector).call{value: protocolFeePaid}("");
+        require(success, "FixinProtocolFees/ETHER_TRANSFER_FALIED");
+        return protocolFeePaid;
     }
 
     /// @dev Transfer fees for a given pool to the staking contract.
     /// @param poolId Identifies the pool whose fees are being paid.
-    function _transferFeesForPool(
-        bytes32 poolId,
-        IStaking staking,
-        IEtherTokenV06 weth
-    )
+    function _transferFeesForPool(bytes32 poolId)
         internal
     {
-        FeeCollector feeCollector = _getFeeCollector(poolId);
-
-        uint256 codeSize;
-        assembly {
-            codeSize := extcodesize(feeCollector)
-        }
-
-        if (codeSize == 0) {
-            // Create and initialize the contract if necessary.
-            new FeeCollector{salt: poolId}();
-            feeCollector.initialize(weth, staking, poolId);
-        }
-
-        if (address(feeCollector).balance > 1) {
-            feeCollector.convertToWeth(weth);
-        }
-
-        uint256 bal = weth.balanceOf(address(feeCollector));
+        // This will create a FeeCollector contract (if necessary) and wrap
+        // fees for the pool ID.
+        FeeCollector feeCollector =
+            FEE_COLLECTOR_CONTROLLER.prepareFeeCollectorToPayFees(poolId);
+        // All fees in the fee collector should be in WETH now.
+        uint256 bal = WETH.balanceOf(address(feeCollector));
         if (bal > 1) {
             // Leave 1 wei behind to avoid high SSTORE cost of zero-->non-zero.
-            staking.payProtocolFee(
+            STAKING.payProtocolFee(
                 address(feeCollector),
                 address(feeCollector),
                 bal - 1);
@@ -95,20 +97,25 @@ abstract contract FixinProtocolFees {
 
     /// @dev Compute the CREATE2 address for a fee collector.
     /// @param poolId The fee collector's pool ID.
-    function _getFeeCollector(
-        bytes32 poolId
-    )
+    function _getFeeCollector(bytes32 poolId)
         internal
         view
         returns (FeeCollector)
     {
-        // Compute the CREATE2 address for the fee collector.
-        address payable addr = address(uint256(keccak256(abi.encodePacked(
-            byte(0xff),
-            address(this),
-            poolId, // pool ID is salt
-            feeCollectorCodeHash
-        ))));
-        return FeeCollector(addr);
+        return FeeCollector(LibFeeCollector.getFeeCollectorAddress(
+            address(FEE_COLLECTOR_CONTROLLER),
+            FEE_COLLECTOR_INIT_CODE_HASH,
+            poolId
+        ));
+    }
+
+    /// @dev Get the cost of a single protocol fee.
+    /// @return protocolFeeAmount The protocol fee amount, in ETH/WETH.
+    function _getSingleProtocolFee()
+        internal
+        view
+        returns (uint256 protocolFeeAmount)
+    {
+        return uint256(PROTOCOL_FEE_MULTIPLIER) * tx.gasprice;
     }
 }

contracts/zero-ex/contracts/src/fixins/FixinTokenSpender.sol

@@ -19,23 +19,37 @@
 pragma solidity ^0.6.5;
 pragma experimental ABIEncoderV2;
 
-import "@0x/contracts-erc20/contracts/src/v06/IERC20TokenV06.sol";
+import "@0x/contracts-erc20/contracts/src/v06/IEtherTokenV06.sol";
 import "@0x/contracts-utils/contracts/src/v06/LibSafeMathV06.sol";
-import "../../errors/LibSpenderRichErrors.sol";
-import "../ITokenSpenderFeature.sol";
+import "../features/ITokenSpenderFeature.sol";
+import "../errors/LibSpenderRichErrors.sol";
+import "../external/FeeCollector.sol";
+import "../vendor/v3/IStaking.sol";
+import "../vendor/v3/IStaking.sol";
 
-library LibTokenSpender {
+
+/// @dev Helpers for moving tokens around.
+abstract contract FixinTokenSpender {
     using LibRichErrorsV06 for bytes;
 
     // Mask of the lower 20 bytes of a bytes32.
     uint256 constant private ADDRESS_MASK = 0x000000000000000000000000ffffffffffffffffffffffffffffffffffffffff;
+    /// @dev A bloom filter for tokens that consume all gas when `transferFrom()` fails.
+    bytes32 public immutable GREEDY_TOKENS_BLOOM_FILTER;
+
+    /// @param greedyTokensBloomFilter The bloom filter for all greedy tokens.
+    constructor(bytes32 greedyTokensBloomFilter)
+        internal
+    {
+        GREEDY_TOKENS_BLOOM_FILTER = greedyTokensBloomFilter;
+    }
 
     /// @dev Transfers ERC20 tokens from `owner` to `to`.
     /// @param token The token to spend.
     /// @param owner The owner of the tokens.
     /// @param to The recipient of the tokens.
     /// @param amount The amount of `token` to transfer.
-    function spendERC20Tokens(
+    function _transferERC20Tokens(
         IERC20TokenV06 token,
         address owner,
         address to,
@@ -46,7 +60,25 @@ library LibTokenSpender {
         bool success;
         bytes memory revertData;
 
-        require(address(token) != address(this), "LibTokenSpender/CANNOT_INVOKE_SELF");
+        require(address(token) != address(this), "FixinTokenSpender/CANNOT_INVOKE_SELF");
+
+        // If the token eats all gas when failing, we do not want to perform
+        // optimistic fall through to the old AllowanceTarget contract if the
+        // direct transferFrom() fails.
+        if (_isTokenPossiblyGreedy(token)) {
+            // If the token does not have a direct allowance on us then we use
+            // the allowance target.
+            if (token.allowance(owner, address(this)) < amount) {
+                _transferFromLegacyAllowanceTarget(
+                    token,
+                    owner,
+                    to,
+                    amount,
+                    ""
+                );
+                return;
+            }
+        }
 
         assembly {
             let ptr := mload(0x40) // free memory pointer
@@ -57,7 +89,15 @@ library LibTokenSpender {
             mstore(add(ptr, 0x24), and(to, ADDRESS_MASK))
             mstore(add(ptr, 0x44), amount)
 
-            success := call(gas(), and(token, ADDRESS_MASK), 0, ptr, 0x64, 0, 0)
+            success := call(
+                gas(),
+                and(token, ADDRESS_MASK),
+                0,
+                ptr,
+                0x64,
+                0,
+                0
+            )
 
             let rdsize := returndatasize()
 
@@ -88,25 +128,13 @@ library LibTokenSpender {
         }
 
         if (!success) {
-            // Try the old AllowanceTarget.
-            try ITokenSpenderFeature(address(this))._spendERC20Tokens(
-                    token,
-                    owner,
-                    to,
-                    amount
-                ) {
-            } catch {
-                // Bubble up the first error message. (In general, the fallback to the
-                // allowance target is opportunistic. We ignore the specific error
-                // message if it fails.)
-                LibSpenderRichErrors.SpenderERC20TransferFromFailedError(
-                    address(token),
-                    owner,
-                    to,
-                    amount,
-                    revertData
-                ).rrevert();
-            }
+            _transferFromLegacyAllowanceTarget(
+                token,
+                owner,
+                to,
+                amount,
+                revertData
+            );
         }
     }
 
@@ -115,7 +143,7 @@ library LibTokenSpender {
     /// @param token The token to spend.
     /// @param owner The owner of the tokens.
     /// @return amount The amount of tokens that can be pulled.
-    function getSpendableERC20BalanceOf(
+    function _getSpendableERC20BalanceOf(
         IERC20TokenV06 token,
         address owner
     )
@@ -128,4 +156,53 @@ library LibTokenSpender {
             token.balanceOf(owner)
         );
     }
+
+    /// @dev Check if a token possibly belongs to the `GREEDY_TOKENS_BLOOM_FILTER`
+    ///      bloom filter.
+    function _isTokenPossiblyGreedy(IERC20TokenV06 token)
+        internal
+        view
+        returns (bool isPossiblyGreedy)
+    {
+        // The hash is given by:
+        // (1 << (keccak256(token) % 256)) | (1 << (token % 256))
+        bytes32 h;
+        assembly {
+            mstore(0, token)
+            h := or(shl(mod(keccak256(0, 32), 256), 1), shl(mod(token, 256), 1))
+        }
+        return (h & GREEDY_TOKENS_BLOOM_FILTER) == h;
+    }
+
+    /// @dev Transfer tokens using the legacy allowance target instead of
+    ///      allowances directly set on the exchange proxy.
+    function _transferFromLegacyAllowanceTarget(
+        IERC20TokenV06 token,
+        address owner,
+        address to,
+        uint256 amount,
+        bytes memory initialRevertData
+    )
+        private
+    {
+        // Try the old AllowanceTarget.
+        try ITokenSpenderFeature(address(this))._spendERC20Tokens(
+                token,
+                owner,
+                to,
+                amount
+            ) {
+        } catch (bytes memory revertData) {
+            // Bubble up the first error message. (In general, the fallback to the
+            // allowance target is opportunistic. We ignore the specific error
+            // message if it fails.)
+            LibSpenderRichErrors.SpenderERC20TransferFromFailedError(
+                address(token),
+                owner,
+                to,
+                amount,
+                initialRevertData.length != 0 ? initialRevertData : revertData
+            ).rrevert();
+        }
+    }
 }

contracts/zero-ex/contracts/src/migrations/FullMigration.sol

@@ -25,6 +25,7 @@ import "../features/TokenSpenderFeature.sol";
 import "../features/TransformERC20Feature.sol";
 import "../features/SignatureValidatorFeature.sol";
 import "../features/MetaTransactionsFeature.sol";
+import "../features/NativeOrdersFeature.sol";
 import "../external/AllowanceTarget.sol";
 import "./InitialMigration.sol";
 
@@ -42,6 +43,7 @@ contract FullMigration {
         TransformERC20Feature transformERC20;
         SignatureValidatorFeature signatureValidator;
         MetaTransactionsFeature metaTransactions;
+        NativeOrdersFeature nativeOrders;
     }
 
     /// @dev Parameters needed to initialize features.
@@ -84,7 +86,7 @@ contract FullMigration {
     /// @param features Features to add to the proxy.
     /// @return _zeroEx The configured ZeroEx contract. Same as the `zeroEx` parameter.
     /// @param migrateOpts Parameters needed to initialize features.
-    function initializeZeroEx(
+    function migrateZeroEx(
         address payable owner,
         ZeroEx zeroEx,
         Features memory features,
@@ -195,5 +197,16 @@ contract FullMigration {
                 address(this)
             );
         }
+        // NativeOrdersFeature
+        {
+            // Register the feature.
+            ownable.migrate(
+                address(features.nativeOrders),
+                abi.encodeWithSelector(
+                    NativeOrdersFeature.migrate.selector
+                ),
+                address(this)
+            );
+        }
     }
 }