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0x9b3c52f1d7c48d478865e96b39e076babd5d4de297639d237cbf36e3e8490cb71 hr 34 mins ago0x8bf74336b29ca489fc45ab1aca95bd623ac717b2  IN   0x90fe2af704b34e0224bf2299c838e04d4dcf13640 Ether0.0008227206
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0x10330503ac616f5905a9c464a688f8482d9b15a5c7e12f595c1254246ff6477b2 hrs 52 mins ago0x8bf74336b29ca489fc45ab1aca95bd623ac717b2  IN   0x90fe2af704b34e0224bf2299c838e04d4dcf13640 Ether0.000634014
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0xc5e28b81b343030f8a7b7977092bb5cb634df23c426a27b3d02afe53cffbd50d2 hrs 56 mins ago0x8a410a6c7cfbdc1e814c319dc401c060a5ca6d6b  IN   0x90fe2af704b34e0224bf2299c838e04d4dcf13640 Ether0.00035223
0x2b2bb413ebdae8f88b0fd975b3bf5990cf0423337791b66d7279bd134eafd8a93 hrs 1 min ago0x8bf74336b29ca489fc45ab1aca95bd623ac717b2  IN   0x90fe2af704b34e0224bf2299c838e04d4dcf13640 Ether0.000634014
0xc4cbd688dd7c0e4d7f09abb113e3684f336c5113c65f722887ac8a58aa7d22cb3 hrs 4 mins ago0x8bf74336b29ca489fc45ab1aca95bd623ac717b2  IN   0x90fe2af704b34e0224bf2299c838e04d4dcf13640 Ether0.000633246
0xa009ac19b9201df183b1732ffd016f6bc6cd956dd63e761e0cd518d8fdaa64913 hrs 6 mins ago0x8a410a6c7cfbdc1e814c319dc401c060a5ca6d6b  IN   0x90fe2af704b34e0224bf2299c838e04d4dcf13640 Ether0.00035223
0x0d9c7540a735abdde0cb1d9da9e9ae2399a67a6226ccf277b308567fd41b690e3 hrs 6 mins ago0x8a410a6c7cfbdc1e814c319dc401c060a5ca6d6b  IN   0x90fe2af704b34e0224bf2299c838e04d4dcf13640 Ether0.00035223
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0x3b0721643cd829da918cad4963422400fefabb424bbf997803cfc1e5ab0e5cca3 hrs 47 mins ago0xddc22378334f7093a7b191594ceea907e098b61e  IN   0x90fe2af704b34e0224bf2299c838e04d4dcf13640 Ether0.000739613
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Warning: The Compiled Contract might be susceptible to ExpExponentCleanup (medium/high-severity), NestedArrayFunctionCallDecoder (medium-severity), ZeroFunctionSelector (very low-severity), DelegateCallReturnValue (low-severity) SolidityCompiler Bugs.

Contract Source Code Verified (Exact Match)
Contract Name: Exchange
Compiler Text: v0.4.14+commit.c2215d46
Optimization Enabled: No
Runs (Optimiser):  200



  Contract Source Code   Find Similiar Contracts

/*

  Copyright 2017 ZeroEx Inc.

  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 0.4.14;

/*

  Copyright 2017 ZeroEx Inc.

  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.

*/

contract Token {

    /// @return total amount of tokens
    function totalSupply() constant returns (uint supply) {}

    /// @param _owner The address from which the balance will be retrieved
    /// @return The balance
    function balanceOf(address _owner) constant returns (uint balance) {}

    /// @notice send `_value` token to `_to` from `msg.sender`
    /// @param _to The address of the recipient
    /// @param _value The amount of token to be transferred
    /// @return Whether the transfer was successful or not
    function transfer(address _to, uint _value) returns (bool success) {}

    /// @notice send `_value` token to `_to` from `_from` on the condition it is approved by `_from`
    /// @param _from The address of the sender
    /// @param _to The address of the recipient
    /// @param _value The amount of token to be transferred
    /// @return Whether the transfer was successful or not
    function transferFrom(address _from, address _to, uint _value) returns (bool success) {}

    /// @notice `msg.sender` approves `_addr` to spend `_value` tokens
    /// @param _spender The address of the account able to transfer the tokens
    /// @param _value The amount of wei to be approved for transfer
    /// @return Whether the approval was successful or not
    function approve(address _spender, uint _value) returns (bool success) {}

    /// @param _owner The address of the account owning tokens
    /// @param _spender The address of the account able to transfer the tokens
    /// @return Amount of remaining tokens allowed to spent
    function allowance(address _owner, address _spender) constant returns (uint remaining) {}

    event Transfer(address indexed _from, address indexed _to, uint _value);
    event Approval(address indexed _owner, address indexed _spender, uint _value);
}

/*
 * Ownable
 *
 * Base contract with an owner.
 * Provides onlyOwner modifier, which prevents function from running if it is called by anyone other than the owner.
 */

contract Ownable {
    address public owner;

    function Ownable() {
        owner = msg.sender;
    }

    modifier onlyOwner() {
        require(msg.sender == owner);
        _;
    }

    function transferOwnership(address newOwner) onlyOwner {
        if (newOwner != address(0)) {
            owner = newOwner;
        }
    }
}

/// @title TokenTransferProxy - Transfers tokens on behalf of contracts that have been approved via decentralized governance.
/// @author Amir Bandeali - <[email protected]>, Will Warren - <[email protected]com>
contract TokenTransferProxy is Ownable {

    /// @dev Only authorized addresses can invoke functions with this modifier.
    modifier onlyAuthorized {
        require(authorized[msg.sender]);
        _;
    }

    modifier targetAuthorized(address target) {
        require(authorized[target]);
        _;
    }

    modifier targetNotAuthorized(address target) {
        require(!authorized[target]);
        _;
    }

    mapping (address => bool) public authorized;
    address[] public authorities;

    event LogAuthorizedAddressAdded(address indexed target, address indexed caller);
    event LogAuthorizedAddressRemoved(address indexed target, address indexed caller);

    /*
     * Public functions
     */

    /// @dev Authorizes an address.
    /// @param target Address to authorize.
    function addAuthorizedAddress(address target)
        public
        onlyOwner
        targetNotAuthorized(target)
    {
        authorized[target] = true;
        authorities.push(target);
        LogAuthorizedAddressAdded(target, msg.sender);
    }

    /// @dev Removes authorizion of an address.
    /// @param target Address to remove authorization from.
    function removeAuthorizedAddress(address target)
        public
        onlyOwner
        targetAuthorized(target)
    {
        delete authorized[target];
        for (uint i = 0; i < authorities.length; i++) {
            if (authorities[i] == target) {
                authorities[i] = authorities[authorities.length - 1];
                authorities.length -= 1;
                break;
            }
        }
        LogAuthorizedAddressRemoved(target, msg.sender);
    }

    /// @dev Calls into ERC20 Token contract, invoking transferFrom.
    /// @param token Address of token to transfer.
    /// @param from Address to transfer token from.
    /// @param to Address to transfer token to.
    /// @param value Amount of token to transfer.
    /// @return Success of transfer.
    function transferFrom(
        address token,
        address from,
        address to,
        uint value)
        public
        onlyAuthorized
        returns (bool)
    {
        return Token(token).transferFrom(from, to, value);
    }

    /*
     * Public constant functions
     */

    /// @dev Gets all authorized addresses.
    /// @return Array of authorized addresses.
    function getAuthorizedAddresses()
        public
        constant
        returns (address[])
    {
        return authorities;
    }
}


contract SafeMath {
    function safeMul(uint a, uint b) internal constant returns (uint256) {
        uint c = a * b;
        assert(a == 0 || c / a == b);
        return c;
    }

    function safeDiv(uint a, uint b) internal constant returns (uint256) {
        uint c = a / b;
        return c;
    }

    function safeSub(uint a, uint b) internal constant returns (uint256) {
        assert(b <= a);
        return a - b;
    }

    function safeAdd(uint a, uint b) internal constant returns (uint256) {
        uint c = a + b;
        assert(c >= a);
        return c;
    }

    function max64(uint64 a, uint64 b) internal constant returns (uint64) {
        return a >= b ? a : b;
    }

    function min64(uint64 a, uint64 b) internal constant returns (uint64) {
        return a < b ? a : b;
    }

    function max256(uint256 a, uint256 b) internal constant returns (uint256) {
        return a >= b ? a : b;
    }

    function min256(uint256 a, uint256 b) internal constant returns (uint256) {
        return a < b ? a : b;
    }
}

/// @title Exchange - Facilitates exchange of ERC20 tokens.
/// @author Amir Bandeali - <[email protected]>, Will Warren - <[email protected]>
contract Exchange is SafeMath {

    // Error Codes
    enum Errors {
        ORDER_EXPIRED,                    // Order has already expired
        ORDER_FULLY_FILLED_OR_CANCELLED,  // Order has already been fully filled or cancelled
        ROUNDING_ERROR_TOO_LARGE,         // Rounding error too large
        INSUFFICIENT_BALANCE_OR_ALLOWANCE // Insufficient balance or allowance for token transfer
    }

    string constant public VERSION = "1.0.0";
    uint16 constant public EXTERNAL_QUERY_GAS_LIMIT = 4999;    // Changes to state require at least 5000 gas

    address public ZRX_TOKEN_CONTRACT;
    address public TOKEN_TRANSFER_PROXY_CONTRACT;

    // Mappings of orderHash => amounts of takerTokenAmount filled or cancelled.
    mapping (bytes32 => uint) public filled;
    mapping (bytes32 => uint) public cancelled;

    event LogFill(
        address indexed maker,
        address taker,
        address indexed feeRecipient,
        address makerToken,
        address takerToken,
        uint filledMakerTokenAmount,
        uint filledTakerTokenAmount,
        uint paidMakerFee,
        uint paidTakerFee,
        bytes32 indexed tokens, // keccak256(makerToken, takerToken), allows subscribing to a token pair
        bytes32 orderHash
    );

    event LogCancel(
        address indexed maker,
        address indexed feeRecipient,
        address makerToken,
        address takerToken,
        uint cancelledMakerTokenAmount,
        uint cancelledTakerTokenAmount,
        bytes32 indexed tokens,
        bytes32 orderHash
    );

    event LogError(uint8 indexed errorId, bytes32 indexed orderHash);

    struct Order {
        address maker;
        address taker;
        address makerToken;
        address takerToken;
        address feeRecipient;
        uint makerTokenAmount;
        uint takerTokenAmount;
        uint makerFee;
        uint takerFee;
        uint expirationTimestampInSec;
        bytes32 orderHash;
    }

    function Exchange(address _zrxToken, address _tokenTransferProxy) {
        ZRX_TOKEN_CONTRACT = _zrxToken;
        TOKEN_TRANSFER_PROXY_CONTRACT = _tokenTransferProxy;
    }

    /*
    * Core exchange functions
    */

    /// @dev Fills the input order.
    /// @param orderAddresses Array of order's maker, taker, makerToken, takerToken, and feeRecipient.
    /// @param orderValues Array of order's makerTokenAmount, takerTokenAmount, makerFee, takerFee, expirationTimestampInSec, and salt.
    /// @param fillTakerTokenAmount Desired amount of takerToken to fill.
    /// @param shouldThrowOnInsufficientBalanceOrAllowance Test if transfer will fail before attempting.
    /// @param v ECDSA signature parameter v.
    /// @param r ECDSA signature parameters r.
    /// @param s ECDSA signature parameters s.
    /// @return Total amount of takerToken filled in trade.
    function fillOrder(
          address[5] orderAddresses,
          uint[6] orderValues,
          uint fillTakerTokenAmount,
          bool shouldThrowOnInsufficientBalanceOrAllowance,
          uint8 v,
          bytes32 r,
          bytes32 s)
          public
          returns (uint filledTakerTokenAmount)
    {
        Order memory order = Order({
            maker: orderAddresses[0],
            taker: orderAddresses[1],
            makerToken: orderAddresses[2],
            takerToken: orderAddresses[3],
            feeRecipient: orderAddresses[4],
            makerTokenAmount: orderValues[0],
            takerTokenAmount: orderValues[1],
            makerFee: orderValues[2],
            takerFee: orderValues[3],
            expirationTimestampInSec: orderValues[4],
            orderHash: getOrderHash(orderAddresses, orderValues)
        });

        require(order.taker == address(0) || order.taker == msg.sender);
        require(order.makerTokenAmount > 0 && order.takerTokenAmount > 0 && fillTakerTokenAmount > 0);
        require(isValidSignature(
            order.maker,
            order.orderHash,
            v,
            r,
            s
        ));

        if (block.timestamp >= order.expirationTimestampInSec) {
            LogError(uint8(Errors.ORDER_EXPIRED), order.orderHash);
            return 0;
        }

        uint remainingTakerTokenAmount = safeSub(order.takerTokenAmount, getUnavailableTakerTokenAmount(order.orderHash));
        filledTakerTokenAmount = min256(fillTakerTokenAmount, remainingTakerTokenAmount);
        if (filledTakerTokenAmount == 0) {
            LogError(uint8(Errors.ORDER_FULLY_FILLED_OR_CANCELLED), order.orderHash);
            return 0;
        }

        if (isRoundingError(filledTakerTokenAmount, order.takerTokenAmount, order.makerTokenAmount)) {
            LogError(uint8(Errors.ROUNDING_ERROR_TOO_LARGE), order.orderHash);
            return 0;
        }

        if (!shouldThrowOnInsufficientBalanceOrAllowance && !isTransferable(order, filledTakerTokenAmount)) {
            LogError(uint8(Errors.INSUFFICIENT_BALANCE_OR_ALLOWANCE), order.orderHash);
            return 0;
        }

        uint filledMakerTokenAmount = getPartialAmount(filledTakerTokenAmount, order.takerTokenAmount, order.makerTokenAmount);
        uint paidMakerFee;
        uint paidTakerFee;
        filled[order.orderHash] = safeAdd(filled[order.orderHash], filledTakerTokenAmount);
        require(transferViaTokenTransferProxy(
            order.makerToken,
            order.maker,
            msg.sender,
            filledMakerTokenAmount
        ));
        require(transferViaTokenTransferProxy(
            order.takerToken,
            msg.sender,
            order.maker,
            filledTakerTokenAmount
        ));
        if (order.feeRecipient != address(0)) {
            if (order.makerFee > 0) {
                paidMakerFee = getPartialAmount(filledTakerTokenAmount, order.takerTokenAmount, order.makerFee);
                require(transferViaTokenTransferProxy(
                    ZRX_TOKEN_CONTRACT,
                    order.maker,
                    order.feeRecipient,
                    paidMakerFee
                ));
            }
            if (order.takerFee > 0) {
                paidTakerFee = getPartialAmount(filledTakerTokenAmount, order.takerTokenAmount, order.takerFee);
                require(transferViaTokenTransferProxy(
                    ZRX_TOKEN_CONTRACT,
                    msg.sender,
                    order.feeRecipient,
                    paidTakerFee
                ));
            }
        }

        LogFill(
            order.maker,
            msg.sender,
            order.feeRecipient,
            order.makerToken,
            order.takerToken,
            filledMakerTokenAmount,
            filledTakerTokenAmount,
            paidMakerFee,
            paidTakerFee,
            keccak256(order.makerToken, order.takerToken),
            order.orderHash
        );
        return filledTakerTokenAmount;
    }

    /// @dev Cancels the input order.
    /// @param orderAddresses Array of order's maker, taker, makerToken, takerToken, and feeRecipient.
    /// @param orderValues Array of order's makerTokenAmount, takerTokenAmount, makerFee, takerFee, expirationTimestampInSec, and salt.
    /// @param cancelTakerTokenAmount Desired amount of takerToken to cancel in order.
    /// @return Amount of takerToken cancelled.
    function cancelOrder(
        address[5] orderAddresses,
        uint[6] orderValues,
        uint cancelTakerTokenAmount)
        public
        returns (uint)
    {
        Order memory order = Order({
            maker: orderAddresses[0],
            taker: orderAddresses[1],
            makerToken: orderAddresses[2],
            takerToken: orderAddresses[3],
            feeRecipient: orderAddresses[4],
            makerTokenAmount: orderValues[0],
            takerTokenAmount: orderValues[1],
            makerFee: orderValues[2],
            takerFee: orderValues[3],
            expirationTimestampInSec: orderValues[4],
            orderHash: getOrderHash(orderAddresses, orderValues)
        });

        require(order.maker == msg.sender);
        require(order.makerTokenAmount > 0 && order.takerTokenAmount > 0 && cancelTakerTokenAmount > 0);

        if (block.timestamp >= order.expirationTimestampInSec) {
            LogError(uint8(Errors.ORDER_EXPIRED), order.orderHash);
            return 0;
        }

        uint remainingTakerTokenAmount = safeSub(order.takerTokenAmount, getUnavailableTakerTokenAmount(order.orderHash));
        uint cancelledTakerTokenAmount = min256(cancelTakerTokenAmount, remainingTakerTokenAmount);
        if (cancelledTakerTokenAmount == 0) {
            LogError(uint8(Errors.ORDER_FULLY_FILLED_OR_CANCELLED), order.orderHash);
            return 0;
        }

        cancelled[order.orderHash] = safeAdd(cancelled[order.orderHash], cancelledTakerTokenAmount);

        LogCancel(
            order.maker,
            order.feeRecipient,
            order.makerToken,
            order.takerToken,
            getPartialAmount(cancelledTakerTokenAmount, order.takerTokenAmount, order.makerTokenAmount),
            cancelledTakerTokenAmount,
            keccak256(order.makerToken, order.takerToken),
            order.orderHash
        );
        return cancelledTakerTokenAmount;
    }

    /*
    * Wrapper functions
    */

    /// @dev Fills an order with specified parameters and ECDSA signature, throws if specified amount not filled entirely.
    /// @param orderAddresses Array of order's maker, taker, makerToken, takerToken, and feeRecipient.
    /// @param orderValues Array of order's makerTokenAmount, takerTokenAmount, makerFee, takerFee, expirationTimestampInSec, and salt.
    /// @param fillTakerTokenAmount Desired amount of takerToken to fill.
    /// @param v ECDSA signature parameter v.
    /// @param r ECDSA signature parameters r.
    /// @param s ECDSA signature parameters s.
    function fillOrKillOrder(
        address[5] orderAddresses,
        uint[6] orderValues,
        uint fillTakerTokenAmount,
        uint8 v,
        bytes32 r,
        bytes32 s)
        public
    {
        require(fillOrder(
            orderAddresses,
            orderValues,
            fillTakerTokenAmount,
            false,
            v,
            r,
            s
        ) == fillTakerTokenAmount);
    }

    /// @dev Synchronously executes multiple fill orders in a single transaction.
    /// @param orderAddresses Array of address arrays containing individual order addresses.
    /// @param orderValues Array of uint arrays containing individual order values.
    /// @param fillTakerTokenAmounts Array of desired amounts of takerToken to fill in orders.
    /// @param shouldThrowOnInsufficientBalanceOrAllowance Test if transfers will fail before attempting.
    /// @param v Array ECDSA signature v parameters.
    /// @param r Array of ECDSA signature r parameters.
    /// @param s Array of ECDSA signature s parameters.
    function batchFillOrders(
        address[5][] orderAddresses,
        uint[6][] orderValues,
        uint[] fillTakerTokenAmounts,
        bool shouldThrowOnInsufficientBalanceOrAllowance,
        uint8[] v,
        bytes32[] r,
        bytes32[] s)
        public
    {
        for (uint i = 0; i < orderAddresses.length; i++) {
            fillOrder(
                orderAddresses[i],
                orderValues[i],
                fillTakerTokenAmounts[i],
                shouldThrowOnInsufficientBalanceOrAllowance,
                v[i],
                r[i],
                s[i]
            );
        }
    }

    /// @dev Synchronously executes multiple fillOrKill orders in a single transaction.
    /// @param orderAddresses Array of address arrays containing individual order addresses.
    /// @param orderValues Array of uint arrays containing individual order values.
    /// @param fillTakerTokenAmounts Array of desired amounts of takerToken to fill in orders.
    /// @param v Array ECDSA signature v parameters.
    /// @param r Array of ECDSA signature r parameters.
    /// @param s Array of ECDSA signature s parameters.
    function batchFillOrKillOrders(
        address[5][] orderAddresses,
        uint[6][] orderValues,
        uint[] fillTakerTokenAmounts,
        uint8[] v,
        bytes32[] r,
        bytes32[] s)
        public
    {
        for (uint i = 0; i < orderAddresses.length; i++) {
            fillOrKillOrder(
                orderAddresses[i],
                orderValues[i],
                fillTakerTokenAmounts[i],
                v[i],
                r[i],
                s[i]
            );
        }
    }

    /// @dev Synchronously executes multiple fill orders in a single transaction until total fillTakerTokenAmount filled.
    /// @param orderAddresses Array of address arrays containing individual order addresses.
    /// @param orderValues Array of uint arrays containing individual order values.
    /// @param fillTakerTokenAmount Desired total amount of takerToken to fill in orders.
    /// @param shouldThrowOnInsufficientBalanceOrAllowance Test if transfers will fail before attempting.
    /// @param v Array ECDSA signature v parameters.
    /// @param r Array of ECDSA signature r parameters.
    /// @param s Array of ECDSA signature s parameters.
    /// @return Total amount of fillTakerTokenAmount filled in orders.
    function fillOrdersUpTo(
        address[5][] orderAddresses,
        uint[6][] orderValues,
        uint fillTakerTokenAmount,
        bool shouldThrowOnInsufficientBalanceOrAllowance,
        uint8[] v,
        bytes32[] r,
        bytes32[] s)
        public
        returns (uint)
    {
        uint filledTakerTokenAmount = 0;
        for (uint i = 0; i < orderAddresses.length; i++) {
            require(orderAddresses[i][3] == orderAddresses[0][3]); // takerToken must be the same for each order
            filledTakerTokenAmount = safeAdd(filledTakerTokenAmount, fillOrder(
                orderAddresses[i],
                orderValues[i],
                safeSub(fillTakerTokenAmount, filledTakerTokenAmount),
                shouldThrowOnInsufficientBalanceOrAllowance,
                v[i],
                r[i],
                s[i]
            ));
            if (filledTakerTokenAmount == fillTakerTokenAmount) break;
        }
        return filledTakerTokenAmount;
    }

    /// @dev Synchronously cancels multiple orders in a single transaction.
    /// @param orderAddresses Array of address arrays containing individual order addresses.
    /// @param orderValues Array of uint arrays containing individual order values.
    /// @param cancelTakerTokenAmounts Array of desired amounts of takerToken to cancel in orders.
    function batchCancelOrders(
        address[5][] orderAddresses,
        uint[6][] orderValues,
        uint[] cancelTakerTokenAmounts)
        public
    {
        for (uint i = 0; i < orderAddresses.length; i++) {
            cancelOrder(
                orderAddresses[i],
                orderValues[i],
                cancelTakerTokenAmounts[i]
            );
        }
    }

    /*
    * Constant public functions
    */

    /// @dev Calculates Keccak-256 hash of order with specified parameters.
    /// @param orderAddresses Array of order's maker, taker, makerToken, takerToken, and feeRecipient.
    /// @param orderValues Array of order's makerTokenAmount, takerTokenAmount, makerFee, takerFee, expirationTimestampInSec, and salt.
    /// @return Keccak-256 hash of order.
    function getOrderHash(address[5] orderAddresses, uint[6] orderValues)
        public
        constant
        returns (bytes32)
    {
        return keccak256(
            address(this),
            orderAddresses[0], // maker
            orderAddresses[1], // taker
            orderAddresses[2], // makerToken
            orderAddresses[3], // takerToken
            orderAddresses[4], // feeRecipient
            orderValues[0],    // makerTokenAmount
            orderValues[1],    // takerTokenAmount
            orderValues[2],    // makerFee
            orderValues[3],    // takerFee
            orderValues[4],    // expirationTimestampInSec
            orderValues[5]     // salt
        );
    }

    /// @dev Verifies that an order signature is valid.
    /// @param signer address of signer.
    /// @param hash Signed Keccak-256 hash.
    /// @param v ECDSA signature parameter v.
    /// @param r ECDSA signature parameters r.
    /// @param s ECDSA signature parameters s.
    /// @return Validity of order signature.
    function isValidSignature(
        address signer,
        bytes32 hash,
        uint8 v,
        bytes32 r,
        bytes32 s)
        public
        constant
        returns (bool)
    {
        return signer == ecrecover(
            keccak256("\x19Ethereum Signed Message:\n32", hash),
            v,
            r,
            s
        );
    }

    /// @dev Checks if rounding error > 0.1%.
    /// @param numerator Numerator.
    /// @param denominator Denominator.
    /// @param target Value to multiply with numerator/denominator.
    /// @return Rounding error is present.
    function isRoundingError(uint numerator, uint denominator, uint target)
        public
        constant
        returns (bool)
    {
        uint remainder = mulmod(target, numerator, denominator);
        if (remainder == 0) return false; // No rounding error.

        uint errPercentageTimes1000000 = safeDiv(
            safeMul(remainder, 1000000),
            safeMul(numerator, target)
        );
        return errPercentageTimes1000000 > 1000;
    }

    /// @dev Calculates partial value given a numerator and denominator.
    /// @param numerator Numerator.
    /// @param denominator Denominator.
    /// @param target Value to calculate partial of.
    /// @return Partial value of target.
    function getPartialAmount(uint numerator, uint denominator, uint target)
        public
        constant
        returns (uint)
    {
        return safeDiv(safeMul(numerator, target), denominator);
    }

    /// @dev Calculates the sum of values already filled and cancelled for a given order.
    /// @param orderHash The Keccak-256 hash of the given order.
    /// @return Sum of values already filled and cancelled.
    function getUnavailableTakerTokenAmount(bytes32 orderHash)
        public
        constant
        returns (uint)
    {
        return safeAdd(filled[orderHash], cancelled[orderHash]);
    }


    /*
    * Internal functions
    */

    /// @dev Transfers a token using TokenTransferProxy transferFrom function.
    /// @param token Address of token to transferFrom.
    /// @param from Address transfering token.
    /// @param to Address receiving token.
    /// @param value Amount of token to transfer.
    /// @return Success of token transfer.
    function transferViaTokenTransferProxy(
        address token,
        address from,
        address to,
        uint value)
        internal
        returns (bool)
    {
        return TokenTransferProxy(TOKEN_TRANSFER_PROXY_CONTRACT).transferFrom(token, from, to, value);
    }

    /// @dev Checks if any order transfers will fail.
    /// @param order Order struct of params that will be checked.
    /// @param fillTakerTokenAmount Desired amount of takerToken to fill.
    /// @return Predicted result of transfers.
    function isTransferable(Order order, uint fillTakerTokenAmount)
        internal
        constant  // The called token contracts may attempt to change state, but will not be able to due to gas limits on getBalance and getAllowance.
        returns (bool)
    {
        address taker = msg.sender;
        uint fillMakerTokenAmount = getPartialAmount(fillTakerTokenAmount, order.takerTokenAmount, order.makerTokenAmount);

        if (order.feeRecipient != address(0)) {
            bool isMakerTokenZRX = order.makerToken == ZRX_TOKEN_CONTRACT;
            bool isTakerTokenZRX = order.takerToken == ZRX_TOKEN_CONTRACT;
            uint paidMakerFee = getPartialAmount(fillTakerTokenAmount, order.takerTokenAmount, order.makerFee);
            uint paidTakerFee = getPartialAmount(fillTakerTokenAmount, order.takerTokenAmount, order.takerFee);
            uint requiredMakerZRX = isMakerTokenZRX ? safeAdd(fillMakerTokenAmount, paidMakerFee) : paidMakerFee;
            uint requiredTakerZRX = isTakerTokenZRX ? safeAdd(fillTakerTokenAmount, paidTakerFee) : paidTakerFee;

            if (   getBalance(ZRX_TOKEN_CONTRACT, order.maker) < requiredMakerZRX
                || getAllowance(ZRX_TOKEN_CONTRACT, order.maker) < requiredMakerZRX
                || getBalance(ZRX_TOKEN_CONTRACT, taker) < requiredTakerZRX
                || getAllowance(ZRX_TOKEN_CONTRACT, taker) < requiredTakerZRX
            ) return false;

            if (!isMakerTokenZRX && (   getBalance(order.makerToken, order.maker) < fillMakerTokenAmount // Don't double check makerToken if ZRX
                                     || getAllowance(order.makerToken, order.maker) < fillMakerTokenAmount)
            ) return false;
            if (!isTakerTokenZRX && (   getBalance(order.takerToken, taker) < fillTakerTokenAmount // Don't double check takerToken if ZRX
                                     || getAllowance(order.takerToken, taker) < fillTakerTokenAmount)
            ) return false;
        } else if (   getBalance(order.makerToken, order.maker) < fillMakerTokenAmount
                   || getAllowance(order.makerToken, order.maker) < fillMakerTokenAmount
                   || getBalance(order.takerToken, taker) < fillTakerTokenAmount
                   || getAllowance(order.takerToken, taker) < fillTakerTokenAmount
        ) return false;

        return true;
    }

    /// @dev Get token balance of an address.
    /// @param token Address of token.
    /// @param owner Address of owner.
    /// @return Token balance of owner.
    function getBalance(address token, address owner)
        internal
        constant  // The called token contract may attempt to change state, but will not be able to due to an added gas limit.
        returns (uint)
    {
        return Token(token).balanceOf.gas(EXTERNAL_QUERY_GAS_LIMIT)(owner); // Limit gas to prevent reentrancy
    }

    /// @dev Get allowance of token given to TokenTransferProxy by an address.
    /// @param token Address of token.
    /// @param owner Address of owner.
    /// @return Allowance of token given to TokenTransferProxy by owner.
    function getAllowance(address token, address owner)
        internal
        constant  // The called token contract may attempt to change state, but will not be able to due to an added gas limit.
        returns (uint)
    {
        return Token(token).allowance.gas(EXTERNAL_QUERY_GAS_LIMIT)(owner, TOKEN_TRANSFER_PROXY_CONTRACT); // Limit gas to prevent reentrancy
    }
}

    Contract ABI  
[{"constant":true,"inputs":[{"name":"numerator","type":"uint256"},{"name":"denominator","type":"uint256"},{"name":"target","type":"uint256"}],"name":"isRoundingError","outputs":[{"name":"","type":"bool"}],"payable":false,"type":"function"},{"constant":true,"inputs":[{"name":"","type":"bytes32"}],"name":"filled","outputs":[{"name":"","type":"uint256"}],"payable":false,"type":"function"},{"constant":true,"inputs":[{"name":"","type":"bytes32"}],"name":"cancelled","outputs":[{"name":"","type":"uint256"}],"payable":false,"type":"function"},{"constant":false,"inputs":[{"name":"orderAddresses","type":"address[5][]"},{"name":"orderValues","type":"uint256[6][]"},{"name":"fillTakerTokenAmount","type":"uint256"},{"name":"shouldThrowOnInsufficientBalanceOrAllowance","type":"bool"},{"name":"v","type":"uint8[]"},{"name":"r","type":"bytes32[]"},{"name":"s","type":"bytes32[]"}],"name":"fillOrdersUpTo","outputs":[{"name":"","type":"uint256"}],"payable":false,"type":"function"},{"constant":false,"inputs":[{"name":"orderAddresses","type":"address[5]"},{"name":"orderValues","type":"uint256[6]"},{"name":"cancelTakerTokenAmount","type":"uint256"}],"name":"cancelOrder","outputs":[{"name":"","type":"uint256"}],"payable":false,"type":"function"},{"constant":true,"inputs":[],"name":"ZRX_TOKEN_CONTRACT","outputs":[{"name":"","type":"address"}],"payable":false,"type":"function"},{"constant":false,"inputs":[{"name":"orderAddresses","type":"address[5][]"},{"name":"orderValues","type":"uint256[6][]"},{"name":"fillTakerTokenAmounts","type":"uint256[]"},{"name":"v","type":"uint8[]"},{"name":"r","type":"bytes32[]"},{"name":"s","type":"bytes32[]"}],"name":"batchFillOrKillOrders","outputs":[],"payable":false,"type":"function"},{"constant":false,"inputs":[{"name":"orderAddresses","type":"address[5]"},{"name":"orderValues","type":"uint256[6]"},{"name":"fillTakerTokenAmount","type":"uint256"},{"name":"v","type":"uint8"},{"name":"r","type":"bytes32"},{"name":"s","type":"bytes32"}],"name":"fillOrKillOrder","outputs":[],"payable":false,"type":"function"},{"constant":true,"inputs":[{"name":"orderHash","type":"bytes32"}],"name":"getUnavailableTakerTokenAmount","outputs":[{"name":"","type":"uint256"}],"payable":false,"type":"function"},{"constant":true,"inputs":[{"name":"signer","type":"address"},{"name":"hash","type":"bytes32"},{"name":"v","type":"uint8"},{"name":"r","type":"bytes32"},{"name":"s","type":"bytes32"}],"name":"isValidSignature","outputs":[{"name":"","type":"bool"}],"payable":false,"type":"function"},{"constant":true,"inputs":[{"name":"numerator","type":"uint256"},{"name":"denominator","type":"uint256"},{"name":"target","type":"uint256"}],"name":"getPartialAmount","outputs":[{"name":"","type":"uint256"}],"payable":false,"type":"function"},{"constant":true,"inputs":[],"name":"TOKEN_TRANSFER_PROXY_CONTRACT","outputs":[{"name":"","type":"address"}],"payable":false,"type":"function"},{"constant":false,"inputs":[{"name":"orderAddresses","type":"address[5][]"},{"name":"orderValues","type":"uint256[6][]"},{"name":"fillTakerTokenAmounts","type":"uint256[]"},{"name":"shouldThrowOnInsufficientBalanceOrAllowance","type":"bool"},{"name":"v","type":"uint8[]"},{"name":"r","type":"bytes32[]"},{"name":"s","type":"bytes32[]"}],"name":"batchFillOrders","outputs":[],"payable":false,"type":"function"},{"constant":false,"inputs":[{"name":"orderAddresses","type":"address[5][]"},{"name":"orderValues","type":"uint256[6][]"},{"name":"cancelTakerTokenAmounts","type":"uint256[]"}],"name":"batchCancelOrders","outputs":[],"payable":false,"type":"function"},{"constant":false,"inputs":[{"name":"orderAddresses","type":"address[5]"},{"name":"orderValues","type":"uint256[6]"},{"name":"fillTakerTokenAmount","type":"uint256"},{"name":"shouldThrowOnInsufficientBalanceOrAllowance","type":"bool"},{"name":"v","type":"uint8"},{"name":"r","type":"bytes32"},{"name":"s","type":"bytes32"}],"name":"fillOrder","outputs":[{"name":"filledTakerTokenAmount","type":"uint256"}],"payable":false,"type":"function"},{"constant":true,"inputs":[{"name":"orderAddresses","type":"address[5]"},{"name":"orderValues","type":"uint256[6]"}],"name":"getOrderHash","outputs":[{"name":"","type":"bytes32"}],"payable":false,"type":"function"},{"constant":true,"inputs":[],"name":"EXTERNAL_QUERY_GAS_LIMIT","outputs":[{"name":"","type":"uint16"}],"payable":false,"type":"function"},{"constant":true,"inputs":[],"name":"VERSION","outputs":[{"name":"","type":"string"}],"payable":false,"type":"function"},{"inputs":[{"name":"_zrxToken","type":"address"},{"name":"_tokenTransferProxy","type":"address"}],"payable":false,"type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"name":"maker","type":"address"},{"indexed":false,"name":"taker","type":"address"},{"indexed":true,"name":"feeRecipient","type":"address"},{"indexed":false,"name":"makerToken","type":"address"},{"indexed":false,"name":"takerToken","type":"address"},{"indexed":false,"name":"filledMakerTokenAmount","type":"uint256"},{"indexed":false,"name":"filledTakerTokenAmount","type":"uint256"},{"indexed":false,"name":"paidMakerFee","type":"uint256"},{"indexed":false,"name":"paidTakerFee","type":"uint256"},{"indexed":true,"name":"tokens","type":"bytes32"},{"indexed":false,"name":"orderHash","type":"bytes32"}],"name":"LogFill","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"name":"maker","type":"address"},{"indexed":true,"name":"feeRecipient","type":"address"},{"indexed":false,"name":"makerToken","type":"address"},{"indexed":false,"name":"takerToken","type":"address"},{"indexed":false,"name":"cancelledMakerTokenAmount","type":"uint256"},{"indexed":false,"name":"cancelledTakerTokenAmount","type":"uint256"},{"indexed":true,"name":"tokens","type":"bytes32"},{"indexed":false,"name":"orderHash","type":"bytes32"}],"name":"LogCancel","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"name":"errorId","type":"uint8"},{"indexed":true,"name":"orderHash","type":"bytes32"}],"name":"LogError","type":"event"}]

  Contract Creation Code Switch To Opcodes View
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    Constructor Arguments (ABI-Encoded and is the last bytes of the Contract Creation Code above)
0000000000000000000000006ff6c0ff1d68b964901f986d4c9fa3ac68346570000000000000000000000000087eed4bc1ee3de49befbd66c662b434b15d49d4

-----Encoded View---------------
2 Constructor Arguments found :
Arg [0] : 0000000000000000000000006ff6c0ff1d68b964901f986d4c9fa3ac68346570
Arg [1] : 000000000000000000000000087eed4bc1ee3de49befbd66c662b434b15d49d4


   Swarm Source:
bzzr://a5b2a039471480ce6cae17a9d584d3bbc82d87e08498a6d0e08a551df1fe0b3a

 

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