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0x2bAE491B065032a76BE1dB9e9eCf5738aFAe203E

DutchX: Exchange

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DutchX

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DutchX: Deployer at txn 0xdfd7c80850e86ba0e8ecbe51267da31ed627bfeadec70e886069cf599de88c42

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Latest 3 from a total of 3 transactions

Transaction Hash	Method	Block		From		To
0x927c24346f328e924d0748f918249bd5176fb4203d2e2b6ce24c7dc6ae83578f	Deposit And Sell	13028445	2021-08-15 7:40:52	1278 days ago	1629013252	0x001791E1...526caFad3	IN	DutchX: Exchange	0 ETH$0.00	0.00079634	28.4224683
0x81120f78d4ca705d6e4aa03455fab6264cb21c912215308511f14dbe72a6f9b8	Close Theoretica...	7833679	2019-05-26 6:33:02	2090 days ago	1558852382	bensmith.eth	IN	DutchX: Exchange	0 ETH$0.00	0.00007663	3
0x9d9bd131fdb97da2a5ad3895c05844608e62f35cad4503ffaeb58bfed033eb8b	Add Token Pair	7796008	2019-05-20 9:12:47	2096 days ago	1558343567	0x829945bE...a7FbC5eB3	IN	DutchX: Exchange	0 ETH$0.00	0.00105148	41

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Contract Source Code Verified (Exact Match)

Contract Name:

DutchExchange

Compiler Version

v0.5.2+commit.1df8f40c

Optimization Enabled:

Yes with 200 runs

Other Settings:

default evmVersion

Contract Source Code (Solidity)

IDE

/**
 *Submitted for verification at Etherscan.io on 2019-02-08
*/

pragma solidity ^0.5.2;

// File: @gnosis.pm/util-contracts/contracts/Proxy.sol

/// @title Proxied - indicates that a contract will be proxied. Also defines storage requirements for Proxy.
/// @author Alan Lu - <[email protected]>
contract Proxied {
    address public masterCopy;
}

/// @title Proxy - Generic proxy contract allows to execute all transactions applying the code of a master contract.
/// @author Stefan George - <[email protected]>
contract Proxy is Proxied {
    /// @dev Constructor function sets address of master copy contract.
    /// @param _masterCopy Master copy address.
    constructor(address _masterCopy) public {
        require(_masterCopy != address(0), "The master copy is required");
        masterCopy = _masterCopy;
    }

    /// @dev Fallback function forwards all transactions and returns all received return data.
    function() external payable {
        address _masterCopy = masterCopy;
        assembly {
            calldatacopy(0, 0, calldatasize)
            let success := delegatecall(not(0), _masterCopy, 0, calldatasize, 0, 0)
            returndatacopy(0, 0, returndatasize)
            switch success
                case 0 {
                    revert(0, returndatasize)
                }
                default {
                    return(0, returndatasize)
                }
        }
    }
}

// File: @gnosis.pm/util-contracts/contracts/Token.sol

/// Implements ERC 20 Token standard: https://github.com/ethereum/EIPs/blob/master/EIPS/eip-20-token-standard.md
pragma solidity ^0.5.2;

/// @title Abstract token contract - Functions to be implemented by token contracts
contract Token {
    /*
     *  Events
     */
    event Transfer(address indexed from, address indexed to, uint value);
    event Approval(address indexed owner, address indexed spender, uint value);

    /*
     *  Public functions
     */
    function transfer(address to, uint value) public returns (bool);
    function transferFrom(address from, address to, uint value) public returns (bool);
    function approve(address spender, uint value) public returns (bool);
    function balanceOf(address owner) public view returns (uint);
    function allowance(address owner, address spender) public view returns (uint);
    function totalSupply() public view returns (uint);
}

// File: @gnosis.pm/util-contracts/contracts/Math.sol

/// @title Math library - Allows calculation of logarithmic and exponential functions
/// @author Alan Lu - <[email protected]>
/// @author Stefan George - <[email protected]>
library GnosisMath {
    /*
     *  Constants
     */
    // This is equal to 1 in our calculations
    uint public constant ONE = 0x10000000000000000;
    uint public constant LN2 = 0xb17217f7d1cf79ac;
    uint public constant LOG2_E = 0x171547652b82fe177;

    /*
     *  Public functions
     */
    /// @dev Returns natural exponential function value of given x
    /// @param x x
    /// @return e**x
    function exp(int x) public pure returns (uint) {
        // revert if x is > MAX_POWER, where
        // MAX_POWER = int(mp.floor(mp.log(mpf(2**256 - 1) / ONE) * ONE))
        require(x <= 2454971259878909886679);
        // return 0 if exp(x) is tiny, using
        // MIN_POWER = int(mp.floor(mp.log(mpf(1) / ONE) * ONE))
        if (x < -818323753292969962227) return 0;
        // Transform so that e^x -> 2^x
        x = x * int(ONE) / int(LN2);
        // 2^x = 2^whole(x) * 2^frac(x)
        //       ^^^^^^^^^^ is a bit shift
        // so Taylor expand on z = frac(x)
        int shift;
        uint z;
        if (x >= 0) {
            shift = x / int(ONE);
            z = uint(x % int(ONE));
        } else {
            shift = x / int(ONE) - 1;
            z = ONE - uint(-x % int(ONE));
        }
        // 2^x = 1 + (ln 2) x + (ln 2)^2/2! x^2 + ...
        //
        // Can generate the z coefficients using mpmath and the following lines
        // >>> from mpmath import mp
        // >>> mp.dps = 100
        // >>> ONE =  0x10000000000000000
        // >>> print('\n'.join(hex(int(mp.log(2)**i / mp.factorial(i) * ONE)) for i in range(1, 7)))
        // 0xb17217f7d1cf79ab
        // 0x3d7f7bff058b1d50
        // 0xe35846b82505fc5
        // 0x276556df749cee5
        // 0x5761ff9e299cc4
        // 0xa184897c363c3
        uint zpow = z;
        uint result = ONE;
        result += 0xb17217f7d1cf79ab * zpow / ONE;
        zpow = zpow * z / ONE;
        result += 0x3d7f7bff058b1d50 * zpow / ONE;
        zpow = zpow * z / ONE;
        result += 0xe35846b82505fc5 * zpow / ONE;
        zpow = zpow * z / ONE;
        result += 0x276556df749cee5 * zpow / ONE;
        zpow = zpow * z / ONE;
        result += 0x5761ff9e299cc4 * zpow / ONE;
        zpow = zpow * z / ONE;
        result += 0xa184897c363c3 * zpow / ONE;
        zpow = zpow * z / ONE;
        result += 0xffe5fe2c4586 * zpow / ONE;
        zpow = zpow * z / ONE;
        result += 0x162c0223a5c8 * zpow / ONE;
        zpow = zpow * z / ONE;
        result += 0x1b5253d395e * zpow / ONE;
        zpow = zpow * z / ONE;
        result += 0x1e4cf5158b * zpow / ONE;
        zpow = zpow * z / ONE;
        result += 0x1e8cac735 * zpow / ONE;
        zpow = zpow * z / ONE;
        result += 0x1c3bd650 * zpow / ONE;
        zpow = zpow * z / ONE;
        result += 0x1816193 * zpow / ONE;
        zpow = zpow * z / ONE;
        result += 0x131496 * zpow / ONE;
        zpow = zpow * z / ONE;
        result += 0xe1b7 * zpow / ONE;
        zpow = zpow * z / ONE;
        result += 0x9c7 * zpow / ONE;
        if (shift >= 0) {
            if (result >> (256 - shift) > 0) return (2 ** 256 - 1);
            return result << shift;
        } else return result >> (-shift);
    }

    /// @dev Returns natural logarithm value of given x
    /// @param x x
    /// @return ln(x)
    function ln(uint x) public pure returns (int) {
        require(x > 0);
        // binary search for floor(log2(x))
        int ilog2 = floorLog2(x);
        int z;
        if (ilog2 < 0) z = int(x << uint(-ilog2));
        else z = int(x >> uint(ilog2));
        // z = x * 2^-⌊log₂x⌋
        // so 1 <= z < 2
        // and ln z = ln x - ⌊log₂x⌋/log₂e
        // so just compute ln z using artanh series
        // and calculate ln x from that
        int term = (z - int(ONE)) * int(ONE) / (z + int(ONE));
        int halflnz = term;
        int termpow = term * term / int(ONE) * term / int(ONE);
        halflnz += termpow / 3;
        termpow = termpow * term / int(ONE) * term / int(ONE);
        halflnz += termpow / 5;
        termpow = termpow * term / int(ONE) * term / int(ONE);
        halflnz += termpow / 7;
        termpow = termpow * term / int(ONE) * term / int(ONE);
        halflnz += termpow / 9;
        termpow = termpow * term / int(ONE) * term / int(ONE);
        halflnz += termpow / 11;
        termpow = termpow * term / int(ONE) * term / int(ONE);
        halflnz += termpow / 13;
        termpow = termpow * term / int(ONE) * term / int(ONE);
        halflnz += termpow / 15;
        termpow = termpow * term / int(ONE) * term / int(ONE);
        halflnz += termpow / 17;
        termpow = termpow * term / int(ONE) * term / int(ONE);
        halflnz += termpow / 19;
        termpow = termpow * term / int(ONE) * term / int(ONE);
        halflnz += termpow / 21;
        termpow = termpow * term / int(ONE) * term / int(ONE);
        halflnz += termpow / 23;
        termpow = termpow * term / int(ONE) * term / int(ONE);
        halflnz += termpow / 25;
        return (ilog2 * int(ONE)) * int(ONE) / int(LOG2_E) + 2 * halflnz;
    }

    /// @dev Returns base 2 logarithm value of given x
    /// @param x x
    /// @return logarithmic value
    function floorLog2(uint x) public pure returns (int lo) {
        lo = -64;
        int hi = 193;
        // I use a shift here instead of / 2 because it floors instead of rounding towards 0
        int mid = (hi + lo) >> 1;
        while ((lo + 1) < hi) {
            if (mid < 0 && x << uint(-mid) < ONE || mid >= 0 && x >> uint(mid) < ONE) hi = mid;
            else lo = mid;
            mid = (hi + lo) >> 1;
        }
    }

    /// @dev Returns maximum of an array
    /// @param nums Numbers to look through
    /// @return Maximum number
    function max(int[] memory nums) public pure returns (int maxNum) {
        require(nums.length > 0);
        maxNum = -2 ** 255;
        for (uint i = 0; i < nums.length; i++) if (nums[i] > maxNum) maxNum = nums[i];
    }

    /// @dev Returns whether an add operation causes an overflow
    /// @param a First addend
    /// @param b Second addend
    /// @return Did no overflow occur?
    function safeToAdd(uint a, uint b) internal pure returns (bool) {
        return a + b >= a;
    }

    /// @dev Returns whether a subtraction operation causes an underflow
    /// @param a Minuend
    /// @param b Subtrahend
    /// @return Did no underflow occur?
    function safeToSub(uint a, uint b) internal pure returns (bool) {
        return a >= b;
    }

    /// @dev Returns whether a multiply operation causes an overflow
    /// @param a First factor
    /// @param b Second factor
    /// @return Did no overflow occur?
    function safeToMul(uint a, uint b) internal pure returns (bool) {
        return b == 0 || a * b / b == a;
    }

    /// @dev Returns sum if no overflow occurred
    /// @param a First addend
    /// @param b Second addend
    /// @return Sum
    function add(uint a, uint b) internal pure returns (uint) {
        require(safeToAdd(a, b));
        return a + b;
    }

    /// @dev Returns difference if no overflow occurred
    /// @param a Minuend
    /// @param b Subtrahend
    /// @return Difference
    function sub(uint a, uint b) internal pure returns (uint) {
        require(safeToSub(a, b));
        return a - b;
    }

    /// @dev Returns product if no overflow occurred
    /// @param a First factor
    /// @param b Second factor
    /// @return Product
    function mul(uint a, uint b) internal pure returns (uint) {
        require(safeToMul(a, b));
        return a * b;
    }

    /// @dev Returns whether an add operation causes an overflow
    /// @param a First addend
    /// @param b Second addend
    /// @return Did no overflow occur?
    function safeToAdd(int a, int b) internal pure returns (bool) {
        return (b >= 0 && a + b >= a) || (b < 0 && a + b < a);
    }

    /// @dev Returns whether a subtraction operation causes an underflow
    /// @param a Minuend
    /// @param b Subtrahend
    /// @return Did no underflow occur?
    function safeToSub(int a, int b) internal pure returns (bool) {
        return (b >= 0 && a - b <= a) || (b < 0 && a - b > a);
    }

    /// @dev Returns whether a multiply operation causes an overflow
    /// @param a First factor
    /// @param b Second factor
    /// @return Did no overflow occur?
    function safeToMul(int a, int b) internal pure returns (bool) {
        return (b == 0) || (a * b / b == a);
    }

    /// @dev Returns sum if no overflow occurred
    /// @param a First addend
    /// @param b Second addend
    /// @return Sum
    function add(int a, int b) internal pure returns (int) {
        require(safeToAdd(a, b));
        return a + b;
    }

    /// @dev Returns difference if no overflow occurred
    /// @param a Minuend
    /// @param b Subtrahend
    /// @return Difference
    function sub(int a, int b) internal pure returns (int) {
        require(safeToSub(a, b));
        return a - b;
    }

    /// @dev Returns product if no overflow occurred
    /// @param a First factor
    /// @param b Second factor
    /// @return Product
    function mul(int a, int b) internal pure returns (int) {
        require(safeToMul(a, b));
        return a * b;
    }
}

// File: @gnosis.pm/util-contracts/contracts/GnosisStandardToken.sol

/**
 * Deprecated: Use Open Zeppeling one instead
 */
contract StandardTokenData {
    /*
     *  Storage
     */
    mapping(address => uint) balances;
    mapping(address => mapping(address => uint)) allowances;
    uint totalTokens;
}

/**
 * Deprecated: Use Open Zeppeling one instead
 */
/// @title Standard token contract with overflow protection
contract GnosisStandardToken is Token, StandardTokenData {
    using GnosisMath for *;

    /*
     *  Public functions
     */
    /// @dev Transfers sender's tokens to a given address. Returns success
    /// @param to Address of token receiver
    /// @param value Number of tokens to transfer
    /// @return Was transfer successful?
    function transfer(address to, uint value) public returns (bool) {
        if (!balances[msg.sender].safeToSub(value) || !balances[to].safeToAdd(value)) {
            return false;
        }

        balances[msg.sender] -= value;
        balances[to] += value;
        emit Transfer(msg.sender, to, value);
        return true;
    }

    /// @dev Allows allowed third party to transfer tokens from one address to another. Returns success
    /// @param from Address from where tokens are withdrawn
    /// @param to Address to where tokens are sent
    /// @param value Number of tokens to transfer
    /// @return Was transfer successful?
    function transferFrom(address from, address to, uint value) public returns (bool) {
        if (!balances[from].safeToSub(value) || !allowances[from][msg.sender].safeToSub(
            value
        ) || !balances[to].safeToAdd(value)) {
            return false;
        }
        balances[from] -= value;
        allowances[from][msg.sender] -= value;
        balances[to] += value;
        emit Transfer(from, to, value);
        return true;
    }

    /// @dev Sets approved amount of tokens for spender. Returns success
    /// @param spender Address of allowed account
    /// @param value Number of approved tokens
    /// @return Was approval successful?
    function approve(address spender, uint value) public returns (bool) {
        allowances[msg.sender][spender] = value;
        emit Approval(msg.sender, spender, value);
        return true;
    }

    /// @dev Returns number of allowed tokens for given address
    /// @param owner Address of token owner
    /// @param spender Address of token spender
    /// @return Remaining allowance for spender
    function allowance(address owner, address spender) public view returns (uint) {
        return allowances[owner][spender];
    }

    /// @dev Returns number of tokens owned by given address
    /// @param owner Address of token owner
    /// @return Balance of owner
    function balanceOf(address owner) public view returns (uint) {
        return balances[owner];
    }

    /// @dev Returns total supply of tokens
    /// @return Total supply
    function totalSupply() public view returns (uint) {
        return totalTokens;
    }
}

// File: contracts/TokenFRT.sol

/// @title Standard token contract with overflow protection
contract TokenFRT is Proxied, GnosisStandardToken {
    address public owner;

    string public constant symbol = "MGN";
    string public constant name = "Magnolia Token";
    uint8 public constant decimals = 18;

    struct UnlockedToken {
        uint amountUnlocked;
        uint withdrawalTime;
    }

    /*
     *  Storage
     */
    address public minter;

    // user => UnlockedToken
    mapping(address => UnlockedToken) public unlockedTokens;

    // user => amount
    mapping(address => uint) public lockedTokenBalances;

    /*
     *  Public functions
     */

    // @dev allows to set the minter of Magnolia tokens once.
    // @param   _minter the minter of the Magnolia tokens, should be the DX-proxy
    function updateMinter(address _minter) public {
        require(msg.sender == owner, "Only the minter can set a new one");
        require(_minter != address(0), "The new minter must be a valid address");

        minter = _minter;
    }

    // @dev the intention is to set the owner as the DX-proxy, once it is deployed
    // Then only an update of the DX-proxy contract after a 30 days delay could change the minter again.
    function updateOwner(address _owner) public {
        require(msg.sender == owner, "Only the owner can update the owner");
        require(_owner != address(0), "The new owner must be a valid address");
        owner = _owner;
    }

    function mintTokens(address user, uint amount) public {
        require(msg.sender == minter, "Only the minter can mint tokens");

        lockedTokenBalances[user] = add(lockedTokenBalances[user], amount);
        totalTokens = add(totalTokens, amount);
    }

    /// @dev Lock Token
    function lockTokens(uint amount) public returns (uint totalAmountLocked) {
        // Adjust amount by balance
        uint actualAmount = min(amount, balances[msg.sender]);

        // Update state variables
        balances[msg.sender] = sub(balances[msg.sender], actualAmount);
        lockedTokenBalances[msg.sender] = add(lockedTokenBalances[msg.sender], actualAmount);

        // Get return variable
        totalAmountLocked = lockedTokenBalances[msg.sender];
    }

    function unlockTokens() public returns (uint totalAmountUnlocked, uint withdrawalTime) {
        // Adjust amount by locked balances
        uint amount = lockedTokenBalances[msg.sender];

        if (amount > 0) {
            // Update state variables
            lockedTokenBalances[msg.sender] = sub(lockedTokenBalances[msg.sender], amount);
            unlockedTokens[msg.sender].amountUnlocked = add(unlockedTokens[msg.sender].amountUnlocked, amount);
            unlockedTokens[msg.sender].withdrawalTime = now + 24 hours;
        }

        // Get return variables
        totalAmountUnlocked = unlockedTokens[msg.sender].amountUnlocked;
        withdrawalTime = unlockedTokens[msg.sender].withdrawalTime;
    }

    function withdrawUnlockedTokens() public {
        require(unlockedTokens[msg.sender].withdrawalTime < now, "The tokens cannot be withdrawn yet");
        balances[msg.sender] = add(balances[msg.sender], unlockedTokens[msg.sender].amountUnlocked);
        unlockedTokens[msg.sender].amountUnlocked = 0;
    }

    function min(uint a, uint b) public pure returns (uint) {
        if (a < b) {
            return a;
        } else {
            return b;
        }
    }
    
    /// @dev Returns whether an add operation causes an overflow
    /// @param a First addend
    /// @param b Second addend
    /// @return Did no overflow occur?
    function safeToAdd(uint a, uint b) public pure returns (bool) {
        return a + b >= a;
    }

    /// @dev Returns whether a subtraction operation causes an underflow
    /// @param a Minuend
    /// @param b Subtrahend
    /// @return Did no underflow occur?
    function safeToSub(uint a, uint b) public pure returns (bool) {
        return a >= b;
    }

    /// @dev Returns sum if no overflow occurred
    /// @param a First addend
    /// @param b Second addend
    /// @return Sum
    function add(uint a, uint b) public pure returns (uint) {
        require(safeToAdd(a, b), "It must be a safe adition");
        return a + b;
    }

    /// @dev Returns difference if no overflow occurred
    /// @param a Minuend
    /// @param b Subtrahend
    /// @return Difference
    function sub(uint a, uint b) public pure returns (uint) {
        require(safeToSub(a, b), "It must be a safe substraction");
        return a - b;
    }
}

// File: @gnosis.pm/owl-token/contracts/TokenOWL.sol

contract TokenOWL is Proxied, GnosisStandardToken {
    using GnosisMath for *;

    string public constant name = "OWL Token";
    string public constant symbol = "OWL";
    uint8 public constant decimals = 18;

    struct masterCopyCountdownType {
        address masterCopy;
        uint timeWhenAvailable;
    }

    masterCopyCountdownType masterCopyCountdown;

    address public creator;
    address public minter;

    event Minted(address indexed to, uint256 amount);
    event Burnt(address indexed from, address indexed user, uint256 amount);

    modifier onlyCreator() {
        // R1
        require(msg.sender == creator, "Only the creator can perform the transaction");
        _;
    }
    /// @dev trickers the update process via the proxyMaster for a new address _masterCopy
    /// updating is only possible after 30 days
    function startMasterCopyCountdown(address _masterCopy) public onlyCreator {
        require(address(_masterCopy) != address(0), "The master copy must be a valid address");

        // Update masterCopyCountdown
        masterCopyCountdown.masterCopy = _masterCopy;
        masterCopyCountdown.timeWhenAvailable = now + 30 days;
    }

    /// @dev executes the update process via the proxyMaster for a new address _masterCopy
    function updateMasterCopy() public onlyCreator {
        require(address(masterCopyCountdown.masterCopy) != address(0), "The master copy must be a valid address");
        require(
            block.timestamp >= masterCopyCountdown.timeWhenAvailable,
            "It's not possible to update the master copy during the waiting period"
        );

        // Update masterCopy
        masterCopy = masterCopyCountdown.masterCopy;
    }

    function getMasterCopy() public view returns (address) {
        return masterCopy;
    }

    /// @dev Set minter. Only the creator of this contract can call this.
    /// @param newMinter The new address authorized to mint this token
    function setMinter(address newMinter) public onlyCreator {
        minter = newMinter;
    }

    /// @dev change owner/creator of the contract. Only the creator/owner of this contract can call this.
    /// @param newOwner The new address, which should become the owner
    function setNewOwner(address newOwner) public onlyCreator {
        creator = newOwner;
    }

    /// @dev Mints OWL.
    /// @param to Address to which the minted token will be given
    /// @param amount Amount of OWL to be minted
    function mintOWL(address to, uint amount) public {
        require(minter != address(0), "The minter must be initialized");
        require(msg.sender == minter, "Only the minter can mint OWL");
        balances[to] = balances[to].add(amount);
        totalTokens = totalTokens.add(amount);
        emit Minted(to, amount);
    }

    /// @dev Burns OWL.
    /// @param user Address of OWL owner
    /// @param amount Amount of OWL to be burnt
    function burnOWL(address user, uint amount) public {
        allowances[user][msg.sender] = allowances[user][msg.sender].sub(amount);
        balances[user] = balances[user].sub(amount);
        totalTokens = totalTokens.sub(amount);
        emit Burnt(msg.sender, user, amount);
    }
}

// File: contracts/base/SafeTransfer.sol

interface BadToken {
    function transfer(address to, uint value) external;
    function transferFrom(address from, address to, uint value) external;
}

contract SafeTransfer {
    function safeTransfer(address token, address to, uint value, bool from) internal returns (bool result) {
        if (from) {
            BadToken(token).transferFrom(msg.sender, address(this), value);
        } else {
            BadToken(token).transfer(to, value);
        }

        // solium-disable-next-line security/no-inline-assembly
        assembly {
            switch returndatasize
                case 0 {
                    // This is our BadToken
                    result := not(0) // result is true
                }
                case 32 {
                    // This is our GoodToken
                    returndatacopy(0, 0, 32)
                    result := mload(0) // result == returndata of external call
                }
                default {
                    // This is not an ERC20 token
                    result := 0
                }
        }
        return result;
    }
}

// File: contracts/base/AuctioneerManaged.sol

contract AuctioneerManaged {
    // auctioneer has the power to manage some variables
    address public auctioneer;

    function updateAuctioneer(address _auctioneer) public onlyAuctioneer {
        require(_auctioneer != address(0), "The auctioneer must be a valid address");
        auctioneer = _auctioneer;
    }

    // > Modifiers
    modifier onlyAuctioneer() {
        // Only allows auctioneer to proceed
        // R1
        // require(msg.sender == auctioneer, "Only auctioneer can perform this operation");
        require(msg.sender == auctioneer, "Only the auctioneer can nominate a new one");
        _;
    }
}

// File: contracts/base/TokenWhitelist.sol

contract TokenWhitelist is AuctioneerManaged {
    // Mapping that stores the tokens, which are approved
    // Only tokens approved by auctioneer generate frtToken tokens
    // addressToken => boolApproved
    mapping(address => bool) public approvedTokens;

    event Approval(address indexed token, bool approved);

    /// @dev for quick overview of approved Tokens
    /// @param addressesToCheck are the ERC-20 token addresses to be checked whether they are approved
    function getApprovedAddressesOfList(address[] calldata addressesToCheck) external view returns (bool[] memory) {
        uint length = addressesToCheck.length;

        bool[] memory isApproved = new bool[](length);

        for (uint i = 0; i < length; i++) {
            isApproved[i] = approvedTokens[addressesToCheck[i]];
        }

        return isApproved;
    }
    
    function updateApprovalOfToken(address[] memory token, bool approved) public onlyAuctioneer {
        for (uint i = 0; i < token.length; i++) {
            approvedTokens[token[i]] = approved;
            emit Approval(token[i], approved);
        }
    }

}

// File: contracts/base/DxMath.sol

contract DxMath {
    // > Math fns
    function min(uint a, uint b) public pure returns (uint) {
        if (a < b) {
            return a;
        } else {
            return b;
        }
    }

    function atleastZero(int a) public pure returns (uint) {
        if (a < 0) {
            return 0;
        } else {
            return uint(a);
        }
    }
    
    /// @dev Returns whether an add operation causes an overflow
    /// @param a First addend
    /// @param b Second addend
    /// @return Did no overflow occur?
    function safeToAdd(uint a, uint b) public pure returns (bool) {
        return a + b >= a;
    }

    /// @dev Returns whether a subtraction operation causes an underflow
    /// @param a Minuend
    /// @param b Subtrahend
    /// @return Did no underflow occur?
    function safeToSub(uint a, uint b) public pure returns (bool) {
        return a >= b;
    }

    /// @dev Returns whether a multiply operation causes an overflow
    /// @param a First factor
    /// @param b Second factor
    /// @return Did no overflow occur?
    function safeToMul(uint a, uint b) public pure returns (bool) {
        return b == 0 || a * b / b == a;
    }

    /// @dev Returns sum if no overflow occurred
    /// @param a First addend
    /// @param b Second addend
    /// @return Sum
    function add(uint a, uint b) public pure returns (uint) {
        require(safeToAdd(a, b));
        return a + b;
    }

    /// @dev Returns difference if no overflow occurred
    /// @param a Minuend
    /// @param b Subtrahend
    /// @return Difference
    function sub(uint a, uint b) public pure returns (uint) {
        require(safeToSub(a, b));
        return a - b;
    }

    /// @dev Returns product if no overflow occurred
    /// @param a First factor
    /// @param b Second factor
    /// @return Product
    function mul(uint a, uint b) public pure returns (uint) {
        require(safeToMul(a, b));
        return a * b;
    }
}

// File: contracts/Oracle/DSMath.sol

contract DSMath {
    /*
    standard uint256 functions
     */

    function add(uint256 x, uint256 y) internal pure returns (uint256 z) {
        assert((z = x + y) >= x);
    }

    function sub(uint256 x, uint256 y) internal pure returns (uint256 z) {
        assert((z = x - y) <= x);
    }

    function mul(uint256 x, uint256 y) internal pure returns (uint256 z) {
        assert((z = x * y) >= x);
    }

    function div(uint256 x, uint256 y) internal pure returns (uint256 z) {
        z = x / y;
    }

    function min(uint256 x, uint256 y) internal pure returns (uint256 z) {
        return x <= y ? x : y;
    }

    function max(uint256 x, uint256 y) internal pure returns (uint256 z) {
        return x >= y ? x : y;
    }

    /*
    uint128 functions (h is for half)
     */

    function hadd(uint128 x, uint128 y) internal pure returns (uint128 z) {
        assert((z = x + y) >= x);
    }

    function hsub(uint128 x, uint128 y) internal pure returns (uint128 z) {
        assert((z = x - y) <= x);
    }

    function hmul(uint128 x, uint128 y) internal pure returns (uint128 z) {
        assert((z = x * y) >= x);
    }

    function hdiv(uint128 x, uint128 y) internal pure returns (uint128 z) {
        z = x / y;
    }

    function hmin(uint128 x, uint128 y) internal pure returns (uint128 z) {
        return x <= y ? x : y;
    }

    function hmax(uint128 x, uint128 y) internal pure returns (uint128 z) {
        return x >= y ? x : y;
    }

    /*
    int256 functions
     */

    function imin(int256 x, int256 y) internal pure returns (int256 z) {
        return x <= y ? x : y;
    }

    function imax(int256 x, int256 y) internal pure returns (int256 z) {
        return x >= y ? x : y;
    }

    /*
    WAD math
     */

    uint128 constant WAD = 10 ** 18;

    function wadd(uint128 x, uint128 y) internal pure returns (uint128) {
        return hadd(x, y);
    }

    function wsub(uint128 x, uint128 y) internal pure returns (uint128) {
        return hsub(x, y);
    }

    function wmul(uint128 x, uint128 y) internal pure returns (uint128 z) {
        z = cast((uint256(x) * y + WAD / 2) / WAD);
    }

    function wdiv(uint128 x, uint128 y) internal pure returns (uint128 z) {
        z = cast((uint256(x) * WAD + y / 2) / y);
    }

    function wmin(uint128 x, uint128 y) internal pure returns (uint128) {
        return hmin(x, y);
    }

    function wmax(uint128 x, uint128 y) internal pure returns (uint128) {
        return hmax(x, y);
    }

    /*
    RAY math
     */

    uint128 constant RAY = 10 ** 27;

    function radd(uint128 x, uint128 y) internal pure returns (uint128) {
        return hadd(x, y);
    }

    function rsub(uint128 x, uint128 y) internal pure returns (uint128) {
        return hsub(x, y);
    }

    function rmul(uint128 x, uint128 y) internal pure returns (uint128 z) {
        z = cast((uint256(x) * y + RAY / 2) / RAY);
    }

    function rdiv(uint128 x, uint128 y) internal pure returns (uint128 z) {
        z = cast((uint256(x) * RAY + y / 2) / y);
    }

    function rpow(uint128 x, uint64 n) internal pure returns (uint128 z) {
        // This famous algorithm is called "exponentiation by squaring"
        // and calculates x^n with x as fixed-point and n as regular unsigned.
        //
        // It's O(log n), instead of O(n) for naive repeated multiplication.
        //
        // These facts are why it works:
        //
        //  If n is even, then x^n = (x^2)^(n/2).
        //  If n is odd,  then x^n = x * x^(n-1),
        //   and applying the equation for even x gives
        //    x^n = x * (x^2)^((n-1) / 2).
        //
        //  Also, EVM division is flooring and
        //    floor[(n-1) / 2] = floor[n / 2].

        z = n % 2 != 0 ? x : RAY;

        for (n /= 2; n != 0; n /= 2) {
            x = rmul(x, x);

            if (n % 2 != 0) {
                z = rmul(z, x);
            }
        }
    }

    function rmin(uint128 x, uint128 y) internal pure returns (uint128) {
        return hmin(x, y);
    }

    function rmax(uint128 x, uint128 y) internal pure returns (uint128) {
        return hmax(x, y);
    }

    function cast(uint256 x) internal pure returns (uint128 z) {
        assert((z = uint128(x)) == x);
    }

}

// File: contracts/Oracle/DSAuth.sol

contract DSAuthority {
    function canCall(address src, address dst, bytes4 sig) public view returns (bool);
}


contract DSAuthEvents {
    event LogSetAuthority(address indexed authority);
    event LogSetOwner(address indexed owner);
}


contract DSAuth is DSAuthEvents {
    DSAuthority public authority;
    address public owner;

    constructor() public {
        owner = msg.sender;
        emit LogSetOwner(msg.sender);
    }

    function setOwner(address owner_) public auth {
        owner = owner_;
        emit LogSetOwner(owner);
    }

    function setAuthority(DSAuthority authority_) public auth {
        authority = authority_;
        emit LogSetAuthority(address(authority));
    }

    modifier auth {
        require(isAuthorized(msg.sender, msg.sig), "It must be an authorized call");
        _;
    }

    function isAuthorized(address src, bytes4 sig) internal view returns (bool) {
        if (src == address(this)) {
            return true;
        } else if (src == owner) {
            return true;
        } else if (authority == DSAuthority(0)) {
            return false;
        } else {
            return authority.canCall(src, address(this), sig);
        }
    }
}

// File: contracts/Oracle/DSNote.sol

contract DSNote {
    event LogNote(
        bytes4 indexed sig,
        address indexed guy,
        bytes32 indexed foo,
        bytes32 bar,
        uint wad,
        bytes fax
    );

    modifier note {
        bytes32 foo;
        bytes32 bar;
        // solium-disable-next-line security/no-inline-assembly
        assembly {
            foo := calldataload(4)
            bar := calldataload(36)
        }

        emit LogNote(
            msg.sig,
            msg.sender,
            foo,
            bar,
            msg.value,
            msg.data
        );

        _;
    }
}

// File: contracts/Oracle/DSThing.sol

contract DSThing is DSAuth, DSNote, DSMath {}

// File: contracts/Oracle/PriceFeed.sol

/// price-feed.sol

// Copyright (C) 2017  DappHub, LLC

// Licensed under the Apache License, Version 2.0 (the "License").
// You may not use this file except in compliance with the License.

// 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 (express or implied).



contract PriceFeed is DSThing {
    uint128 val;
    uint32 public zzz;

    function peek() public view returns (bytes32, bool) {
        return (bytes32(uint256(val)), block.timestamp < zzz);
    }

    function read() public view returns (bytes32) {
        assert(block.timestamp < zzz);
        return bytes32(uint256(val));
    }

    function post(uint128 val_, uint32 zzz_, address med_) public payable note auth {
        val = val_;
        zzz = zzz_;
        (bool success, ) = med_.call(abi.encodeWithSignature("poke()"));
        require(success, "The poke must succeed");
    }

    function void() public payable note auth {
        zzz = 0;
    }

}

// File: contracts/Oracle/DSValue.sol

contract DSValue is DSThing {
    bool has;
    bytes32 val;
    function peek() public view returns (bytes32, bool) {
        return (val, has);
    }

    function read() public view returns (bytes32) {
        (bytes32 wut, bool _has) = peek();
        assert(_has);
        return wut;
    }

    function poke(bytes32 wut) public payable note auth {
        val = wut;
        has = true;
    }

    function void() public payable note auth {
        // unset the value
        has = false;
    }
}

// File: contracts/Oracle/Medianizer.sol

contract Medianizer is DSValue {
    mapping(bytes12 => address) public values;
    mapping(address => bytes12) public indexes;
    bytes12 public next = bytes12(uint96(1));
    uint96 public minimun = 0x1;

    function set(address wat) public auth {
        bytes12 nextId = bytes12(uint96(next) + 1);
        assert(nextId != 0x0);
        set(next, wat);
        next = nextId;
    }

    function set(bytes12 pos, address wat) public payable note auth {
        require(pos != 0x0, "pos cannot be 0x0");
        require(wat == address(0) || indexes[wat] == 0, "wat is not defined or it has an index");

        indexes[values[pos]] = bytes12(0); // Making sure to remove a possible existing address in that position

        if (wat != address(0)) {
            indexes[wat] = pos;
        }

        values[pos] = wat;
    }

    function setMin(uint96 min_) public payable note auth {
        require(min_ != 0x0, "min cannot be 0x0");
        minimun = min_;
    }

    function setNext(bytes12 next_) public payable note auth {
        require(next_ != 0x0, "next cannot be 0x0");
        next = next_;
    }

    function unset(bytes12 pos) public {
        set(pos, address(0));
    }

    function unset(address wat) public {
        set(indexes[wat], address(0));
    }

    function poke() public {
        poke(0);
    }

    function poke(bytes32) public payable note {
        (val, has) = compute();
    }

    function compute() public view returns (bytes32, bool) {
        bytes32[] memory wuts = new bytes32[](uint96(next) - 1);
        uint96 ctr = 0;
        for (uint96 i = 1; i < uint96(next); i++) {
            if (values[bytes12(i)] != address(0)) {
                (bytes32 wut, bool wuz) = DSValue(values[bytes12(i)]).peek();
                if (wuz) {
                    if (ctr == 0 || wut >= wuts[ctr - 1]) {
                        wuts[ctr] = wut;
                    } else {
                        uint96 j = 0;
                        while (wut >= wuts[j]) {
                            j++;
                        }
                        for (uint96 k = ctr; k > j; k--) {
                            wuts[k] = wuts[k - 1];
                        }
                        wuts[j] = wut;
                    }
                    ctr++;
                }
            }
        }

        if (ctr < minimun)
            return (val, false);

        bytes32 value;
        if (ctr % 2 == 0) {
            uint128 val1 = uint128(uint(wuts[(ctr / 2) - 1]));
            uint128 val2 = uint128(uint(wuts[ctr / 2]));
            value = bytes32(uint256(wdiv(hadd(val1, val2), 2 ether)));
        } else {
            value = wuts[(ctr - 1) / 2];
        }

        return (value, true);
    }
}

// File: contracts/Oracle/PriceOracleInterface.sol

/*
This contract is the interface between the MakerDAO priceFeed and our DX platform.
*/




contract PriceOracleInterface {
    address public priceFeedSource;
    address public owner;
    bool public emergencyMode;

    // Modifiers
    modifier onlyOwner() {
        require(msg.sender == owner, "Only the owner can do the operation");
        _;
    }

    /// @dev constructor of the contract
    /// @param _priceFeedSource address of price Feed Source -> should be maker feeds Medianizer contract
    constructor(address _owner, address _priceFeedSource) public {
        owner = _owner;
        priceFeedSource = _priceFeedSource;
    }
    
    /// @dev gives the owner the possibility to put the Interface into an emergencyMode, which will
    /// output always a price of 600 USD. This gives everyone time to set up a new pricefeed.
    function raiseEmergency(bool _emergencyMode) public onlyOwner {
        emergencyMode = _emergencyMode;
    }

    /// @dev updates the priceFeedSource
    /// @param _owner address of owner
    function updateCurator(address _owner) public onlyOwner {
        owner = _owner;
    }

    /// @dev returns the USDETH price
    function getUsdEthPricePeek() public view returns (bytes32 price, bool valid) {
        return Medianizer(priceFeedSource).peek();
    }

    /// @dev returns the USDETH price, ie gets the USD price from Maker feed with 18 digits, but last 18 digits are cut off
    function getUSDETHPrice() public view returns (uint256) {
        // if the contract is in the emergencyMode, because there is an issue with the oracle, we will simply return a price of 600 USD
        if (emergencyMode) {
            return 600;
        }
        (bytes32 price, ) = Medianizer(priceFeedSource).peek();

        // ensuring that there is no underflow or overflow possible,
        // even if the price is compromised
        uint priceUint = uint256(price)/(1 ether);
        if (priceUint == 0) {
            return 1;
        }
        if (priceUint > 1000000) {
            return 1000000; 
        }
        return priceUint;
    }
}

// File: contracts/base/EthOracle.sol

contract EthOracle is AuctioneerManaged, DxMath {
    uint constant WAITING_PERIOD_CHANGE_ORACLE = 30 days;

    // Price Oracle interface
    PriceOracleInterface public ethUSDOracle;
    // Price Oracle interface proposals during update process
    PriceOracleInterface public newProposalEthUSDOracle;

    uint public oracleInterfaceCountdown;

    event NewOracleProposal(PriceOracleInterface priceOracleInterface);

    function initiateEthUsdOracleUpdate(PriceOracleInterface _ethUSDOracle) public onlyAuctioneer {
        require(address(_ethUSDOracle) != address(0), "The oracle address must be valid");
        newProposalEthUSDOracle = _ethUSDOracle;
        oracleInterfaceCountdown = add(block.timestamp, WAITING_PERIOD_CHANGE_ORACLE);
        emit NewOracleProposal(_ethUSDOracle);
    }

    function updateEthUSDOracle() public {
        require(address(newProposalEthUSDOracle) != address(0), "The new proposal must be a valid addres");
        require(
            oracleInterfaceCountdown < block.timestamp,
            "It's not possible to update the oracle during the waiting period"
        );
        ethUSDOracle = newProposalEthUSDOracle;
        newProposalEthUSDOracle = PriceOracleInterface(0);
    }
}

// File: contracts/base/DxUpgrade.sol

contract DxUpgrade is Proxied, AuctioneerManaged, DxMath {
    uint constant WAITING_PERIOD_CHANGE_MASTERCOPY = 30 days;

    address public newMasterCopy;
    // Time when new masterCopy is updatabale
    uint public masterCopyCountdown;

    event NewMasterCopyProposal(address newMasterCopy);

    function startMasterCopyCountdown(address _masterCopy) public onlyAuctioneer {
        require(_masterCopy != address(0), "The new master copy must be a valid address");

        // Update masterCopyCountdown
        newMasterCopy = _masterCopy;
        masterCopyCountdown = add(block.timestamp, WAITING_PERIOD_CHANGE_MASTERCOPY);
        emit NewMasterCopyProposal(_masterCopy);
    }

    function updateMasterCopy() public {
        require(newMasterCopy != address(0), "The new master copy must be a valid address");
        require(block.timestamp >= masterCopyCountdown, "The master contract cannot be updated in a waiting period");

        // Update masterCopy
        masterCopy = newMasterCopy;
        newMasterCopy = address(0);
    }

}

// File: contracts/DutchExchange.sol

/// @title Dutch Exchange - exchange token pairs with the clever mechanism of the dutch auction
/// @author Alex Herrmann - <[email protected]>
/// @author Dominik Teiml - <[email protected]>

contract DutchExchange is DxUpgrade, TokenWhitelist, EthOracle, SafeTransfer {

    // The price is a rational number, so we need a concept of a fraction
    struct Fraction {
        uint num;
        uint den;
    }

    uint constant WAITING_PERIOD_NEW_TOKEN_PAIR = 6 hours;
    uint constant WAITING_PERIOD_NEW_AUCTION = 10 minutes;
    uint constant AUCTION_START_WAITING_FOR_FUNDING = 1;

    // > Storage
    // Ether ERC-20 token
    address public ethToken;

    // Minimum required sell funding for adding a new token pair, in USD
    uint public thresholdNewTokenPair;
    // Minimum required sell funding for starting antoher auction, in USD
    uint public thresholdNewAuction;
    // Fee reduction token (magnolia, ERC-20 token)
    TokenFRT public frtToken;
    // Token for paying fees
    TokenOWL public owlToken;

    // For the following three mappings, there is one mapping for each token pair
    // The order which the tokens should be called is smaller, larger
    // These variables should never be called directly! They have getters below
    // Token => Token => index
    mapping(address => mapping(address => uint)) public latestAuctionIndices;
    // Token => Token => time
    mapping (address => mapping (address => uint)) public auctionStarts;
    // Token => Token => auctionIndex => time
    mapping (address => mapping (address => mapping (uint => uint))) public clearingTimes;

    // Token => Token => auctionIndex => price
    mapping(address => mapping(address => mapping(uint => Fraction))) public closingPrices;

    // Token => Token => amount
    mapping(address => mapping(address => uint)) public sellVolumesCurrent;
    // Token => Token => amount
    mapping(address => mapping(address => uint)) public sellVolumesNext;
    // Token => Token => amount
    mapping(address => mapping(address => uint)) public buyVolumes;

    // Token => user => amount
    // balances stores a user's balance in the DutchX
    mapping(address => mapping(address => uint)) public balances;

    // Token => Token => auctionIndex => amount
    mapping(address => mapping(address => mapping(uint => uint))) public extraTokens;

    // Token => Token =>  auctionIndex => user => amount
    mapping(address => mapping(address => mapping(uint => mapping(address => uint)))) public sellerBalances;
    mapping(address => mapping(address => mapping(uint => mapping(address => uint)))) public buyerBalances;
    mapping(address => mapping(address => mapping(uint => mapping(address => uint)))) public claimedAmounts;

    function depositAndSell(address sellToken, address buyToken, uint amount)
        external
        returns (uint newBal, uint auctionIndex, uint newSellerBal)
    {
        newBal = deposit(sellToken, amount);
        (auctionIndex, newSellerBal) = postSellOrder(sellToken, buyToken, 0, amount);
    }

    function claimAndWithdraw(address sellToken, address buyToken, address user, uint auctionIndex, uint amount)
        external
        returns (uint returned, uint frtsIssued, uint newBal)
    {
        (returned, frtsIssued) = claimSellerFunds(sellToken, buyToken, user, auctionIndex);
        newBal = withdraw(buyToken, amount);
    }

    /// @dev for multiple claims
    /// @param auctionSellTokens are the sellTokens defining an auctionPair
    /// @param auctionBuyTokens are the buyTokens defining an auctionPair
    /// @param auctionIndices are the auction indices on which an token should be claimedAmounts
    /// @param user is the user who wants to his tokens
    function claimTokensFromSeveralAuctionsAsSeller(
        address[] calldata auctionSellTokens,
        address[] calldata auctionBuyTokens,
        uint[] calldata auctionIndices,
        address user
    ) external returns (uint[] memory, uint[] memory)
    {
        uint length = checkLengthsForSeveralAuctionClaiming(auctionSellTokens, auctionBuyTokens, auctionIndices);

        uint[] memory claimAmounts = new uint[](length);
        uint[] memory frtsIssuedList = new uint[](length);

        for (uint i = 0; i < length; i++) {
            (claimAmounts[i], frtsIssuedList[i]) = claimSellerFunds(
                auctionSellTokens[i],
                auctionBuyTokens[i],
                user,
                auctionIndices[i]
            );
        }

        return (claimAmounts, frtsIssuedList);
    }

    /// @dev for multiple claims
    /// @param auctionSellTokens are the sellTokens defining an auctionPair
    /// @param auctionBuyTokens are the buyTokens defining an auctionPair
    /// @param auctionIndices are the auction indices on which an token should be claimedAmounts
    /// @param user is the user who wants to his tokens
    function claimTokensFromSeveralAuctionsAsBuyer(
        address[] calldata auctionSellTokens,
        address[] calldata auctionBuyTokens,
        uint[] calldata auctionIndices,
        address user
    ) external returns (uint[] memory, uint[] memory)
    {
        uint length = checkLengthsForSeveralAuctionClaiming(auctionSellTokens, auctionBuyTokens, auctionIndices);

        uint[] memory claimAmounts = new uint[](length);
        uint[] memory frtsIssuedList = new uint[](length);

        for (uint i = 0; i < length; i++) {
            (claimAmounts[i], frtsIssuedList[i]) = claimBuyerFunds(
                auctionSellTokens[i],
                auctionBuyTokens[i],
                user,
                auctionIndices[i]
            );
        }

        return (claimAmounts, frtsIssuedList);
    }

    /// @dev for multiple withdraws
    /// @param auctionSellTokens are the sellTokens defining an auctionPair
    /// @param auctionBuyTokens are the buyTokens defining an auctionPair
    /// @param auctionIndices are the auction indices on which an token should be claimedAmounts
    function claimAndWithdrawTokensFromSeveralAuctionsAsSeller(
        address[] calldata auctionSellTokens,
        address[] calldata auctionBuyTokens,
        uint[] calldata auctionIndices
    ) external returns (uint[] memory, uint frtsIssued)
    {
        uint length = checkLengthsForSeveralAuctionClaiming(auctionSellTokens, auctionBuyTokens, auctionIndices);

        uint[] memory claimAmounts = new uint[](length);
        uint claimFrts = 0;

        for (uint i = 0; i < length; i++) {
            (claimAmounts[i], claimFrts) = claimSellerFunds(
                auctionSellTokens[i],
                auctionBuyTokens[i],
                msg.sender,
                auctionIndices[i]
            );

            frtsIssued += claimFrts;

            withdraw(auctionBuyTokens[i], claimAmounts[i]);
        }

        return (claimAmounts, frtsIssued);
    }

    /// @dev for multiple withdraws
    /// @param auctionSellTokens are the sellTokens defining an auctionPair
    /// @param auctionBuyTokens are the buyTokens defining an auctionPair
    /// @param auctionIndices are the auction indices on which an token should be claimedAmounts
    function claimAndWithdrawTokensFromSeveralAuctionsAsBuyer(
        address[] calldata auctionSellTokens,
        address[] calldata auctionBuyTokens,
        uint[] calldata auctionIndices
    ) external returns (uint[] memory, uint frtsIssued)
    {
        uint length = checkLengthsForSeveralAuctionClaiming(auctionSellTokens, auctionBuyTokens, auctionIndices);

        uint[] memory claimAmounts = new uint[](length);
        uint claimFrts = 0;

        for (uint i = 0; i < length; i++) {
            (claimAmounts[i], claimFrts) = claimBuyerFunds(
                auctionSellTokens[i],
                auctionBuyTokens[i],
                msg.sender,
                auctionIndices[i]
            );

            frtsIssued += claimFrts;

            withdraw(auctionSellTokens[i], claimAmounts[i]);
        }

        return (claimAmounts, frtsIssued);
    }

    function getMasterCopy() external view returns (address) {
        return masterCopy;
    }

    /// @dev Constructor-Function creates exchange
    /// @param _frtToken - address of frtToken ERC-20 token
    /// @param _owlToken - address of owlToken ERC-20 token
    /// @param _auctioneer - auctioneer for managing interfaces
    /// @param _ethToken - address of ETH ERC-20 token
    /// @param _ethUSDOracle - address of the oracle contract for fetching feeds
    /// @param _thresholdNewTokenPair - Minimum required sell funding for adding a new token pair, in USD
    function setupDutchExchange(
        TokenFRT _frtToken,
        TokenOWL _owlToken,
        address _auctioneer,
        address _ethToken,
        PriceOracleInterface _ethUSDOracle,
        uint _thresholdNewTokenPair,
        uint _thresholdNewAuction
    ) public
    {
        // Make sure contract hasn't been initialised
        require(ethToken == address(0), "The contract must be uninitialized");

        // Validates inputs
        require(address(_owlToken) != address(0), "The OWL address must be valid");
        require(address(_frtToken) != address(0), "The FRT address must be valid");
        require(_auctioneer != address(0), "The auctioneer address must be valid");
        require(_ethToken != address(0), "The WETH address must be valid");
        require(address(_ethUSDOracle) != address(0), "The oracle address must be valid");

        frtToken = _frtToken;
        owlToken = _owlToken;
        auctioneer = _auctioneer;
        ethToken = _ethToken;
        ethUSDOracle = _ethUSDOracle;
        thresholdNewTokenPair = _thresholdNewTokenPair;
        thresholdNewAuction = _thresholdNewAuction;
    }

    function updateThresholdNewTokenPair(uint _thresholdNewTokenPair) public onlyAuctioneer {
        thresholdNewTokenPair = _thresholdNewTokenPair;
    }

    function updateThresholdNewAuction(uint _thresholdNewAuction) public onlyAuctioneer {
        thresholdNewAuction = _thresholdNewAuction;
    }

    /// @param initialClosingPriceNum initial price will be 2 * initialClosingPrice. This is its numerator
    /// @param initialClosingPriceDen initial price will be 2 * initialClosingPrice. This is its denominator
    function addTokenPair(
        address token1,
        address token2,
        uint token1Funding,
        uint token2Funding,
        uint initialClosingPriceNum,
        uint initialClosingPriceDen
    ) public
    {
        // R1
        require(token1 != token2, "You cannot add a token pair using the same token");

        // R2
        require(initialClosingPriceNum != 0, "You must set the numerator for the initial price");

        // R3
        require(initialClosingPriceDen != 0, "You must set the denominator for the initial price");

        // R4
        require(getAuctionIndex(token1, token2) == 0, "The token pair was already added");

        // R5: to prevent overflow
        require(initialClosingPriceNum < 10 ** 18, "You must set a smaller numerator for the initial price");

        // R6
        require(initialClosingPriceDen < 10 ** 18, "You must set a smaller denominator for the initial price");

        setAuctionIndex(token1, token2);

        token1Funding = min(token1Funding, balances[token1][msg.sender]);
        token2Funding = min(token2Funding, balances[token2][msg.sender]);

        // R7
        require(token1Funding < 10 ** 30, "You should use a smaller funding for token 1");

        // R8
        require(token2Funding < 10 ** 30, "You should use a smaller funding for token 2");

        uint fundedValueUSD;
        uint ethUSDPrice = ethUSDOracle.getUSDETHPrice();

        // Compute fundedValueUSD
        address ethTokenMem = ethToken;
        if (token1 == ethTokenMem) {
            // C1
            // MUL: 10^30 * 10^6 = 10^36
            fundedValueUSD = mul(token1Funding, ethUSDPrice);
        } else if (token2 == ethTokenMem) {
            // C2
            // MUL: 10^30 * 10^6 = 10^36
            fundedValueUSD = mul(token2Funding, ethUSDPrice);
        } else {
            // C3: Neither token is ethToken
            fundedValueUSD = calculateFundedValueTokenToken(
                token1,
                token2,
                token1Funding,
                token2Funding,
                ethTokenMem,
                ethUSDPrice
            );
        }

        // R5
        require(fundedValueUSD >= thresholdNewTokenPair, "You should surplus the threshold for adding token pairs");

        // Save prices of opposite auctions
        closingPrices[token1][token2][0] = Fraction(initialClosingPriceNum, initialClosingPriceDen);
        closingPrices[token2][token1][0] = Fraction(initialClosingPriceDen, initialClosingPriceNum);

        // Split into two fns because of 16 local-var cap
        addTokenPairSecondPart(token1, token2, token1Funding, token2Funding);
    }

    function deposit(address tokenAddress, uint amount) public returns (uint) {
        // R1
        require(safeTransfer(tokenAddress, msg.sender, amount, true), "The deposit transaction must succeed");

        uint newBal = add(balances[tokenAddress][msg.sender], amount);

        balances[tokenAddress][msg.sender] = newBal;

        emit NewDeposit(tokenAddress, amount);

        return newBal;
    }

    function withdraw(address tokenAddress, uint amount) public returns (uint) {
        uint usersBalance = balances[tokenAddress][msg.sender];
        amount = min(amount, usersBalance);

        // R1
        require(amount > 0, "The amount must be greater than 0");

        uint newBal = sub(usersBalance, amount);
        balances[tokenAddress][msg.sender] = newBal;

        // R2
        require(safeTransfer(tokenAddress, msg.sender, amount, false), "The withdraw transfer must succeed");
        emit NewWithdrawal(tokenAddress, amount);

        return newBal;
    }

    function postSellOrder(address sellToken, address buyToken, uint auctionIndex, uint amount)
        public
        returns (uint, uint)
    {
        // Note: if a user specifies auctionIndex of 0, it
        // means he is agnostic which auction his sell order goes into

        amount = min(amount, balances[sellToken][msg.sender]);

        // R1
        // require(amount >= 0, "Sell amount should be greater than 0");

        // R2
        uint latestAuctionIndex = getAuctionIndex(sellToken, buyToken);
        require(latestAuctionIndex > 0);

        // R3
        uint auctionStart = getAuctionStart(sellToken, buyToken);
        if (auctionStart == AUCTION_START_WAITING_FOR_FUNDING || auctionStart > now) {
            // C1: We are in the 10 minute buffer period
            // OR waiting for an auction to receive sufficient sellVolume
            // Auction has already cleared, and index has been incremented
            // sell order must use that auction index
            // R1.1
            if (auctionIndex == 0) {
                auctionIndex = latestAuctionIndex;
            } else {
                require(auctionIndex == latestAuctionIndex, "Auction index should be equal to latest auction index");
            }

            // R1.2
            require(add(sellVolumesCurrent[sellToken][buyToken], amount) < 10 ** 30);
        } else {
            // C2
            // R2.1: Sell orders must go to next auction
            if (auctionIndex == 0) {
                auctionIndex = latestAuctionIndex + 1;
            } else {
                require(auctionIndex == latestAuctionIndex + 1);
            }

            // R2.2
            require(add(sellVolumesNext[sellToken][buyToken], amount) < 10 ** 30);
        }

        // Fee mechanism, fees are added to extraTokens
        uint amountAfterFee = settleFee(sellToken, buyToken, auctionIndex, amount);

        // Update variables
        balances[sellToken][msg.sender] = sub(balances[sellToken][msg.sender], amount);
        uint newSellerBal = add(sellerBalances[sellToken][buyToken][auctionIndex][msg.sender], amountAfterFee);
        sellerBalances[sellToken][buyToken][auctionIndex][msg.sender] = newSellerBal;

        if (auctionStart == AUCTION_START_WAITING_FOR_FUNDING || auctionStart > now) {
            // C1
            uint sellVolumeCurrent = sellVolumesCurrent[sellToken][buyToken];
            sellVolumesCurrent[sellToken][buyToken] = add(sellVolumeCurrent, amountAfterFee);
        } else {
            // C2
            uint sellVolumeNext = sellVolumesNext[sellToken][buyToken];
            sellVolumesNext[sellToken][buyToken] = add(sellVolumeNext, amountAfterFee);

            // close previous auction if theoretically closed
            closeTheoreticalClosedAuction(sellToken, buyToken, latestAuctionIndex);
        }

        if (auctionStart == AUCTION_START_WAITING_FOR_FUNDING) {
            scheduleNextAuction(sellToken, buyToken);
        }

        emit NewSellOrder(sellToken, buyToken, msg.sender, auctionIndex, amountAfterFee);

        return (auctionIndex, newSellerBal);
    }

    function postBuyOrder(address sellToken, address buyToken, uint auctionIndex, uint amount)
        public
        returns (uint newBuyerBal)
    {
        // R1: auction must not have cleared
        require(closingPrices[sellToken][buyToken][auctionIndex].den == 0);

        uint auctionStart = getAuctionStart(sellToken, buyToken);

        // R2
        require(auctionStart <= now);

        // R4
        require(auctionIndex == getAuctionIndex(sellToken, buyToken));

        // R5: auction must not be in waiting period
        require(auctionStart > AUCTION_START_WAITING_FOR_FUNDING);

        // R6: auction must be funded
        require(sellVolumesCurrent[sellToken][buyToken] > 0);

        uint buyVolume = buyVolumes[sellToken][buyToken];
        amount = min(amount, balances[buyToken][msg.sender]);

        // R7
        require(add(buyVolume, amount) < 10 ** 30);

        // Overbuy is when a part of a buy order clears an auction
        // In that case we only process the part before the overbuy
        // To calculate overbuy, we first get current price
        uint sellVolume = sellVolumesCurrent[sellToken][buyToken];

        uint num;
        uint den;
        (num, den) = getCurrentAuctionPrice(sellToken, buyToken, auctionIndex);
        // 10^30 * 10^37 = 10^67
        uint outstandingVolume = atleastZero(int(mul(sellVolume, num) / den - buyVolume));

        uint amountAfterFee;
        if (amount < outstandingVolume) {
            if (amount > 0) {
                amountAfterFee = settleFee(buyToken, sellToken, auctionIndex, amount);
            }
        } else {
            amount = outstandingVolume;
            amountAfterFee = outstandingVolume;
        }

        // Here we could also use outstandingVolume or amountAfterFee, it doesn't matter
        if (amount > 0) {
            // Update variables
            balances[buyToken][msg.sender] = sub(balances[buyToken][msg.sender], amount);
            newBuyerBal = add(buyerBalances[sellToken][buyToken][auctionIndex][msg.sender], amountAfterFee);
            buyerBalances[sellToken][buyToken][auctionIndex][msg.sender] = newBuyerBal;
            buyVolumes[sellToken][buyToken] = add(buyVolumes[sellToken][buyToken], amountAfterFee);
            emit NewBuyOrder(sellToken, buyToken, msg.sender, auctionIndex, amountAfterFee);
        }

        // Checking for equality would suffice here. nevertheless:
        if (amount >= outstandingVolume) {
            // Clear auction
            clearAuction(sellToken, buyToken, auctionIndex, sellVolume);
        }

        return (newBuyerBal);
    }

    function claimSellerFunds(address sellToken, address buyToken, address user, uint auctionIndex)
        public
        returns (
        // < (10^60, 10^61)
        uint returned,
        uint frtsIssued
    )
    {
        closeTheoreticalClosedAuction(sellToken, buyToken, auctionIndex);
        uint sellerBalance = sellerBalances[sellToken][buyToken][auctionIndex][user];

        // R1
        require(sellerBalance > 0);

        // Get closing price for said auction
        Fraction memory closingPrice = closingPrices[sellToken][buyToken][auctionIndex];
        uint num = closingPrice.num;
        uint den = closingPrice.den;

        // R2: require auction to have cleared
        require(den > 0);

        // Calculate return
        // < 10^30 * 10^30 = 10^60
        returned = mul(sellerBalance, num) / den;

        frtsIssued = issueFrts(
            sellToken,
            buyToken,
            returned,
            auctionIndex,
            sellerBalance,
            user
        );

        // Claim tokens
        sellerBalances[sellToken][buyToken][auctionIndex][user] = 0;
        if (returned > 0) {
            balances[buyToken][user] = add(balances[buyToken][user], returned);
        }
        emit NewSellerFundsClaim(
            sellToken,
            buyToken,
            user,
            auctionIndex,
            returned,
            frtsIssued
        );
    }

    function claimBuyerFunds(address sellToken, address buyToken, address user, uint auctionIndex)
        public
        returns (uint returned, uint frtsIssued)
    {
        closeTheoreticalClosedAuction(sellToken, buyToken, auctionIndex);

        uint num;
        uint den;
        (returned, num, den) = getUnclaimedBuyerFunds(sellToken, buyToken, user, auctionIndex);

        if (closingPrices[sellToken][buyToken][auctionIndex].den == 0) {
            // Auction is running
            claimedAmounts[sellToken][buyToken][auctionIndex][user] = add(
                claimedAmounts[sellToken][buyToken][auctionIndex][user],
                returned
            );
        } else {
            // Auction has closed
            // We DON'T want to check for returned > 0, because that would fail if a user claims
            // intermediate funds & auction clears in same block (he/she would not be able to claim extraTokens)

            // Assign extra sell tokens (this is possible only after auction has cleared,
            // because buyVolume could still increase before that)
            uint extraTokensTotal = extraTokens[sellToken][buyToken][auctionIndex];
            uint buyerBalance = buyerBalances[sellToken][buyToken][auctionIndex][user];

            // closingPrices.num represents buyVolume
            // < 10^30 * 10^30 = 10^60
            uint tokensExtra = mul(
                buyerBalance,
                extraTokensTotal
            ) / closingPrices[sellToken][buyToken][auctionIndex].num;
            returned = add(returned, tokensExtra);

            frtsIssued = issueFrts(
                buyToken,
                sellToken,
                mul(buyerBalance, den) / num,
                auctionIndex,
                buyerBalance,
                user
            );

            // Auction has closed
            // Reset buyerBalances and claimedAmounts
            buyerBalances[sellToken][buyToken][auctionIndex][user] = 0;
            claimedAmounts[sellToken][buyToken][auctionIndex][user] = 0;
        }

        // Claim tokens
        if (returned > 0) {
            balances[sellToken][user] = add(balances[sellToken][user], returned);
        }

        emit NewBuyerFundsClaim(
            sellToken,
            buyToken,
            user,
            auctionIndex,
            returned,
            frtsIssued
        );
    }

    /// @dev allows to close possible theoretical closed markets
    /// @param sellToken sellToken of an auction
    /// @param buyToken buyToken of an auction
    /// @param auctionIndex is the auctionIndex of the auction
    function closeTheoreticalClosedAuction(address sellToken, address buyToken, uint auctionIndex) public {
        if (auctionIndex == getAuctionIndex(
            buyToken,
            sellToken
        ) && closingPrices[sellToken][buyToken][auctionIndex].num == 0) {
            uint buyVolume = buyVolumes[sellToken][buyToken];
            uint sellVolume = sellVolumesCurrent[sellToken][buyToken];
            uint num;
            uint den;
            (num, den) = getCurrentAuctionPrice(sellToken, buyToken, auctionIndex);
            // 10^30 * 10^37 = 10^67
            if (sellVolume > 0) {
                uint outstandingVolume = atleastZero(int(mul(sellVolume, num) / den - buyVolume));

                if (outstandingVolume == 0) {
                    postBuyOrder(sellToken, buyToken, auctionIndex, 0);
                }
            }
        }
    }

    /// @dev Claim buyer funds for one auction
    function getUnclaimedBuyerFunds(address sellToken, address buyToken, address user, uint auctionIndex)
        public
        view
        returns (
        // < (10^67, 10^37)
        uint unclaimedBuyerFunds,
        uint num,
        uint den
    )
    {
        // R1: checks if particular auction has ever run
        require(auctionIndex <= getAuctionIndex(sellToken, buyToken));

        (num, den) = getCurrentAuctionPrice(sellToken, buyToken, auctionIndex);

        if (num == 0) {
            // This should rarely happen - as long as there is >= 1 buy order,
            // auction will clear before price = 0. So this is just fail-safe
            unclaimedBuyerFunds = 0;
        } else {
            uint buyerBalance = buyerBalances[sellToken][buyToken][auctionIndex][user];
            // < 10^30 * 10^37 = 10^67
            unclaimedBuyerFunds = atleastZero(
                int(mul(buyerBalance, den) / num - claimedAmounts[sellToken][buyToken][auctionIndex][user])
            );
        }
    }

    function getFeeRatio(address user)
        public
        view
        returns (
        // feeRatio < 10^4
        uint num,
        uint den
    )
    {
        uint totalSupply = frtToken.totalSupply();
        uint lockedFrt = frtToken.lockedTokenBalances(user);

        /*
          Fee Model:
            locked FRT range     Fee
            -----------------   ------
            [0, 0.01%)           0.5%
            [0.01%, 0.1%)        0.4%
            [0.1%, 1%)           0.3%
            [1%, 10%)            0.2%
            [10%, 100%)          0.1%
        */

        if (lockedFrt * 10000 < totalSupply || totalSupply == 0) {
            // Maximum fee, if user has locked less than 0.01% of the total FRT
            // Fee: 0.5%
            num = 1;
            den = 200;
        } else if (lockedFrt * 1000 < totalSupply) {
            // If user has locked more than 0.01% and less than 0.1% of the total FRT
            // Fee: 0.4%
            num = 1;
            den = 250;
        } else if (lockedFrt * 100 < totalSupply) {
            // If user has locked more than 0.1% and less than 1% of the total FRT
            // Fee: 0.3%
            num = 3;
            den = 1000;
        } else if (lockedFrt * 10 < totalSupply) {
            // If user has locked more than 1% and less than 10% of the total FRT
            // Fee: 0.2%
            num = 1;
            den = 500;
        } else {
            // If user has locked more than 10% of the total FRT
            // Fee: 0.1%
            num = 1;
            den = 1000;
        }
    }

    //@ dev returns price in units [token2]/[token1]
    //@ param token1 first token for price calculation
    //@ param token2 second token for price calculation
    //@ param auctionIndex index for the auction to get the averaged price from
    function getPriceInPastAuction(
        address token1,
        address token2,
        uint auctionIndex
    )
        public
        view
        // price < 10^31
        returns (uint num, uint den)
    {
        if (token1 == token2) {
            // C1
            num = 1;
            den = 1;
        } else {
            // C2
            // R2.1
            // require(auctionIndex >= 0);

            // C3
            // R3.1
            require(auctionIndex <= getAuctionIndex(token1, token2));
            // auction still running

            uint i = 0;
            bool correctPair = false;
            Fraction memory closingPriceToken1;
            Fraction memory closingPriceToken2;

            while (!correctPair) {
                closingPriceToken2 = closingPrices[token2][token1][auctionIndex - i];
                closingPriceToken1 = closingPrices[token1][token2][auctionIndex - i];

                if (closingPriceToken1.num > 0 && closingPriceToken1.den > 0 ||
                    closingPriceToken2.num > 0 && closingPriceToken2.den > 0)
                {
                    correctPair = true;
                }
                i++;
            }

            // At this point at least one closing price is strictly positive
            // If only one is positive, we want to output that
            if (closingPriceToken1.num == 0 || closingPriceToken1.den == 0) {
                num = closingPriceToken2.den;
                den = closingPriceToken2.num;
            } else if (closingPriceToken2.num == 0 || closingPriceToken2.den == 0) {
                num = closingPriceToken1.num;
                den = closingPriceToken1.den;
            } else {
                // If both prices are positive, output weighted average
                num = closingPriceToken2.den + closingPriceToken1.num;
                den = closingPriceToken2.num + closingPriceToken1.den;
            }
        }
    }

    function scheduleNextAuction(
        address sellToken,
        address buyToken
    )
        internal
    {
        (uint sellVolume, uint sellVolumeOpp) = getSellVolumesInUSD(sellToken, buyToken);

        bool enoughSellVolume = sellVolume >= thresholdNewAuction;
        bool enoughSellVolumeOpp = sellVolumeOpp >= thresholdNewAuction;
        bool schedule;
        // Make sure both sides have liquidity in order to start the auction
        if (enoughSellVolume && enoughSellVolumeOpp) {
            schedule = true;
        } else if (enoughSellVolume || enoughSellVolumeOpp) {
            // But if the auction didn't start in 24h, then is enough to have
            // liquidity in one of the two sides
            uint latestAuctionIndex = getAuctionIndex(sellToken, buyToken);
            uint clearingTime = getClearingTime(sellToken, buyToken, latestAuctionIndex - 1);
            schedule = clearingTime <= now - 24 hours;
        }

        if (schedule) {
            // Schedule next auction
            setAuctionStart(sellToken, buyToken, WAITING_PERIOD_NEW_AUCTION);
        } else {
            resetAuctionStart(sellToken, buyToken);
        }
    }

    function getSellVolumesInUSD(
        address sellToken,
        address buyToken
    )
        internal
        view
        returns (uint sellVolume, uint sellVolumeOpp)
    {
        // Check if auctions received enough sell orders
        uint ethUSDPrice = ethUSDOracle.getUSDETHPrice();

        uint sellNum;
        uint sellDen;
        (sellNum, sellDen) = getPriceOfTokenInLastAuction(sellToken);

        uint buyNum;
        uint buyDen;
        (buyNum, buyDen) = getPriceOfTokenInLastAuction(buyToken);

        // We use current sell volume, because in clearAuction() we set
        // sellVolumesCurrent = sellVolumesNext before calling this function
        // (this is so that we don't need case work,
        // since it might also be called from postSellOrder())

        // < 10^30 * 10^31 * 10^6 = 10^67
        sellVolume = mul(mul(sellVolumesCurrent[sellToken][buyToken], sellNum), ethUSDPrice) / sellDen;
        sellVolumeOpp = mul(mul(sellVolumesCurrent[buyToken][sellToken], buyNum), ethUSDPrice) / buyDen;
    }

    /// @dev Gives best estimate for market price of a token in ETH of any price oracle on the Ethereum network
    /// @param token address of ERC-20 token
    /// @return Weighted average of closing prices of opposite Token-ethToken auctions, based on their sellVolume
    function getPriceOfTokenInLastAuction(address token)
        public
        view
        returns (
        // price < 10^31
        uint num,
        uint den
    )
    {
        uint latestAuctionIndex = getAuctionIndex(token, ethToken);
        // getPriceInPastAuction < 10^30
        (num, den) = getPriceInPastAuction(token, ethToken, latestAuctionIndex - 1);
    }

    function getCurrentAuctionPrice(address sellToken, address buyToken, uint auctionIndex)
        public
        view
        returns (
        // price < 10^37
        uint num,
        uint den
    )
    {
        Fraction memory closingPrice = closingPrices[sellToken][buyToken][auctionIndex];

        if (closingPrice.den != 0) {
            // Auction has closed
            (num, den) = (closingPrice.num, closingPrice.den);
        } else if (auctionIndex > getAuctionIndex(sellToken, buyToken)) {
            (num, den) = (0, 0);
        } else {
            // Auction is running
            uint pastNum;
            uint pastDen;
            (pastNum, pastDen) = getPriceInPastAuction(sellToken, buyToken, auctionIndex - 1);

            // If we're calling the function into an unstarted auction,
            // it will return the starting price of that auction
            uint timeElapsed = atleastZero(int(now - getAuctionStart(sellToken, buyToken)));

            // The numbers below are chosen such that
            // P(0 hrs) = 2 * lastClosingPrice, P(6 hrs) = lastClosingPrice, P(>=24 hrs) = 0

            // 10^5 * 10^31 = 10^36
            num = atleastZero(int((24 hours - timeElapsed) * pastNum));
            // 10^6 * 10^31 = 10^37
            den = mul((timeElapsed + 12 hours), pastDen);

            if (mul(num, sellVolumesCurrent[sellToken][buyToken]) <= mul(den, buyVolumes[sellToken][buyToken])) {
                num = buyVolumes[sellToken][buyToken];
                den = sellVolumesCurrent[sellToken][buyToken];
            }
        }
    }

    // > Helper fns
    function getTokenOrder(address token1, address token2) public pure returns (address, address) {
        if (token2 < token1) {
            (token1, token2) = (token2, token1);
        }

        return (token1, token2);
    }

    function getAuctionStart(address token1, address token2) public view returns (uint auctionStart) {
        (token1, token2) = getTokenOrder(token1, token2);
        auctionStart = auctionStarts[token1][token2];
    }

    function getAuctionIndex(address token1, address token2) public view returns (uint auctionIndex) {
        (token1, token2) = getTokenOrder(token1, token2);
        auctionIndex = latestAuctionIndices[token1][token2];
    }

    function calculateFundedValueTokenToken(
        address token1,
        address token2,
        uint token1Funding,
        uint token2Funding,
        address ethTokenMem,
        uint ethUSDPrice
    )
        internal
        view
        returns (uint fundedValueUSD)
    {
        // We require there to exist ethToken-Token auctions
        // R3.1
        require(getAuctionIndex(token1, ethTokenMem) > 0);

        // R3.2
        require(getAuctionIndex(token2, ethTokenMem) > 0);

        // Price of Token 1
        uint priceToken1Num;
        uint priceToken1Den;
        (priceToken1Num, priceToken1Den) = getPriceOfTokenInLastAuction(token1);

        // Price of Token 2
        uint priceToken2Num;
        uint priceToken2Den;
        (priceToken2Num, priceToken2Den) = getPriceOfTokenInLastAuction(token2);

        // Compute funded value in ethToken and USD
        // 10^30 * 10^30 = 10^60
        uint fundedValueETH = add(
            mul(token1Funding, priceToken1Num) / priceToken1Den,
            token2Funding * priceToken2Num / priceToken2Den
        );

        fundedValueUSD = mul(fundedValueETH, ethUSDPrice);
    }

    function addTokenPairSecondPart(
        address token1,
        address token2,
        uint token1Funding,
        uint token2Funding
    )
        internal
    {
        balances[token1][msg.sender] = sub(balances[token1][msg.sender], token1Funding);
        balances[token2][msg.sender] = sub(balances[token2][msg.sender], token2Funding);

        // Fee mechanism, fees are added to extraTokens
        uint token1FundingAfterFee = settleFee(token1, token2, 1, token1Funding);
        uint token2FundingAfterFee = settleFee(token2, token1, 1, token2Funding);

        // Update other variables
        sellVolumesCurrent[token1][token2] = token1FundingAfterFee;
        sellVolumesCurrent[token2][token1] = token2FundingAfterFee;
        sellerBalances[token1][token2][1][msg.sender] = token1FundingAfterFee;
        sellerBalances[token2][token1][1][msg.sender] = token2FundingAfterFee;

        // Save clearingTime as adding time
        (address tokenA, address tokenB) = getTokenOrder(token1, token2);
        clearingTimes[tokenA][tokenB][0] = now;

        setAuctionStart(token1, token2, WAITING_PERIOD_NEW_TOKEN_PAIR);
        emit NewTokenPair(token1, token2);
    }

    function setClearingTime(
        address token1,
        address token2,
        uint auctionIndex,
        uint auctionStart,
        uint sellVolume,
        uint buyVolume
    )
        internal
    {
        (uint pastNum, uint pastDen) = getPriceInPastAuction(token1, token2, auctionIndex - 1);
        // timeElapsed = (12 hours)*(2 * pastNum * sellVolume - buyVolume * pastDen)/
            // (sellVolume * pastNum + buyVolume * pastDen)
        uint numerator = sub(mul(mul(pastNum, sellVolume), 24 hours), mul(mul(buyVolume, pastDen), 12 hours));
        uint timeElapsed = numerator / (add(mul(sellVolume, pastNum), mul(buyVolume, pastDen)));
        uint clearingTime = auctionStart + timeElapsed;
        (token1, token2) = getTokenOrder(token1, token2);
        clearingTimes[token1][token2][auctionIndex] = clearingTime;
    }

    function getClearingTime(
        address token1,
        address token2,
        uint auctionIndex
    )
        public
        view
        returns (uint time)
    {
        (token1, token2) = getTokenOrder(token1, token2);
        time = clearingTimes[token1][token2][auctionIndex];
    }

    function issueFrts(
        address primaryToken,
        address secondaryToken,
        uint x,
        uint auctionIndex,
        uint bal,
        address user
    )
        internal
        returns (uint frtsIssued)
    {
        if (approvedTokens[primaryToken] && approvedTokens[secondaryToken]) {
            address ethTokenMem = ethToken;
            // Get frts issued based on ETH price of returned tokens
            if (primaryToken == ethTokenMem) {
                frtsIssued = bal;
            } else if (secondaryToken == ethTokenMem) {
                // 10^30 * 10^39 = 10^66
                frtsIssued = x;
            } else {
                // Neither token is ethToken, so we use getHhistoricalPriceOracle()
                uint pastNum;
                uint pastDen;
                (pastNum, pastDen) = getPriceInPastAuction(primaryToken, ethTokenMem, auctionIndex - 1);
                // 10^30 * 10^35 = 10^65
                frtsIssued = mul(bal, pastNum) / pastDen;
            }

            if (frtsIssued > 0) {
                // Issue frtToken
                frtToken.mintTokens(user, frtsIssued);
            }
        }
    }

    function settleFee(address primaryToken, address secondaryToken, uint auctionIndex, uint amount)
        internal
        returns (
        // < 10^30
        uint amountAfterFee
    )
    {
        uint feeNum;
        uint feeDen;
        (feeNum, feeDen) = getFeeRatio(msg.sender);
        // 10^30 * 10^3 / 10^4 = 10^29
        uint fee = mul(amount, feeNum) / feeDen;

        if (fee > 0) {
            fee = settleFeeSecondPart(primaryToken, fee);

            uint usersExtraTokens = extraTokens[primaryToken][secondaryToken][auctionIndex + 1];
            extraTokens[primaryToken][secondaryToken][auctionIndex + 1] = add(usersExtraTokens, fee);

            emit Fee(primaryToken, secondaryToken, msg.sender, auctionIndex, fee);
        }

        amountAfterFee = sub(amount, fee);
    }

    function settleFeeSecondPart(address primaryToken, uint fee) internal returns (uint newFee) {
        // Allow user to reduce up to half of the fee with owlToken
        uint num;
        uint den;
        (num, den) = getPriceOfTokenInLastAuction(primaryToken);

        // Convert fee to ETH, then USD
        // 10^29 * 10^30 / 10^30 = 10^29
        uint feeInETH = mul(fee, num) / den;

        uint ethUSDPrice = ethUSDOracle.getUSDETHPrice();
        // 10^29 * 10^6 = 10^35
        // Uses 18 decimal places <> exactly as owlToken tokens: 10**18 owlToken == 1 USD
        uint feeInUSD = mul(feeInETH, ethUSDPrice);
        uint amountOfowlTokenBurned = min(owlToken.allowance(msg.sender, address(this)), feeInUSD / 2);
        amountOfowlTokenBurned = min(owlToken.balanceOf(msg.sender), amountOfowlTokenBurned);

        if (amountOfowlTokenBurned > 0) {
            owlToken.burnOWL(msg.sender, amountOfowlTokenBurned);
            // Adjust fee
            // 10^35 * 10^29 = 10^64
            uint adjustment = mul(amountOfowlTokenBurned, fee) / feeInUSD;
            newFee = sub(fee, adjustment);
        } else {
            newFee = fee;
        }
    }

    // addClearTimes
    /// @dev clears an Auction
    /// @param sellToken sellToken of the auction
    /// @param buyToken  buyToken of the auction
    /// @param auctionIndex of the auction to be cleared.
    function clearAuction(
        address sellToken,
        address buyToken,
        uint auctionIndex,
        uint sellVolume
    )
        internal
    {
        // Get variables
        uint buyVolume = buyVolumes[sellToken][buyToken];
        uint sellVolumeOpp = sellVolumesCurrent[buyToken][sellToken];
        uint closingPriceOppDen = closingPrices[buyToken][sellToken][auctionIndex].den;
        uint auctionStart = getAuctionStart(sellToken, buyToken);

        // Update closing price
        if (sellVolume > 0) {
            closingPrices[sellToken][buyToken][auctionIndex] = Fraction(buyVolume, sellVolume);
        }

        // if (opposite is 0 auction OR price = 0 OR opposite auction cleared)
        // price = 0 happens if auction pair has been running for >= 24 hrs
        if (sellVolumeOpp == 0 || now >= auctionStart + 24 hours || closingPriceOppDen > 0) {
            // Close auction pair
            uint buyVolumeOpp = buyVolumes[buyToken][sellToken];
            if (closingPriceOppDen == 0 && sellVolumeOpp > 0) {
                // Save opposite price
                closingPrices[buyToken][sellToken][auctionIndex] = Fraction(buyVolumeOpp, sellVolumeOpp);
            }

            uint sellVolumeNext = sellVolumesNext[sellToken][buyToken];
            uint sellVolumeNextOpp = sellVolumesNext[buyToken][sellToken];

            // Update state variables for both auctions
            sellVolumesCurrent[sellToken][buyToken] = sellVolumeNext;
            if (sellVolumeNext > 0) {
                sellVolumesNext[sellToken][buyToken] = 0;
            }
            if (buyVolume > 0) {
                buyVolumes[sellToken][buyToken] = 0;
            }

            sellVolumesCurrent[buyToken][sellToken] = sellVolumeNextOpp;
            if (sellVolumeNextOpp > 0) {
                sellVolumesNext[buyToken][sellToken] = 0;
            }
            if (buyVolumeOpp > 0) {
                buyVolumes[buyToken][sellToken] = 0;
            }

            // Save clearing time
            setClearingTime(sellToken, buyToken, auctionIndex, auctionStart, sellVolume, buyVolume);
            // Increment auction index
            setAuctionIndex(sellToken, buyToken);
            // Check if next auction can be scheduled
            scheduleNextAuction(sellToken, buyToken);
        }

        emit AuctionCleared(sellToken, buyToken, sellVolume, buyVolume, auctionIndex);
    }

    function setAuctionStart(address token1, address token2, uint value) internal {
        (token1, token2) = getTokenOrder(token1, token2);
        uint auctionStart = now + value;
        uint auctionIndex = latestAuctionIndices[token1][token2];
        auctionStarts[token1][token2] = auctionStart;
        emit AuctionStartScheduled(token1, token2, auctionIndex, auctionStart);
    }

    function resetAuctionStart(address token1, address token2) internal {
        (token1, token2) = getTokenOrder(token1, token2);
        if (auctionStarts[token1][token2] != AUCTION_START_WAITING_FOR_FUNDING) {
            auctionStarts[token1][token2] = AUCTION_START_WAITING_FOR_FUNDING;
        }
    }

    function setAuctionIndex(address token1, address token2) internal {
        (token1, token2) = getTokenOrder(token1, token2);
        latestAuctionIndices[token1][token2] += 1;
    }

    function checkLengthsForSeveralAuctionClaiming(
        address[] memory auctionSellTokens,
        address[] memory auctionBuyTokens,
        uint[] memory auctionIndices
    ) internal pure returns (uint length)
    {
        length = auctionSellTokens.length;
        uint length2 = auctionBuyTokens.length;
        require(length == length2);

        uint length3 = auctionIndices.length;
        require(length2 == length3);
    }

    // > Events
    event NewDeposit(address indexed token, uint amount);

    event NewWithdrawal(address indexed token, uint amount);

    event NewSellOrder(
        address indexed sellToken,
        address indexed buyToken,
        address indexed user,
        uint auctionIndex,
        uint amount
    );

    event NewBuyOrder(
        address indexed sellToken,
        address indexed buyToken,
        address indexed user,
        uint auctionIndex,
        uint amount
    );

    event NewSellerFundsClaim(
        address indexed sellToken,
        address indexed buyToken,
        address indexed user,
        uint auctionIndex,
        uint amount,
        uint frtsIssued
    );

    event NewBuyerFundsClaim(
        address indexed sellToken,
        address indexed buyToken,
        address indexed user,
        uint auctionIndex,
        uint amount,
        uint frtsIssued
    );

    event NewTokenPair(address indexed sellToken, address indexed buyToken);

    event AuctionCleared(
        address indexed sellToken,
        address indexed buyToken,
        uint sellVolume,
        uint buyVolume,
        uint indexed auctionIndex
    );

    event AuctionStartScheduled(
        address indexed sellToken,
        address indexed buyToken,
        uint indexed auctionIndex,
        uint auctionStart
    );

    event Fee(
        address indexed primaryToken,
        address indexed secondarToken,
        address indexed user,
        uint auctionIndex,
        uint fee
    );
}

Contract Security Audit

No Contract Security Audit Submitted- Submit Audit Here

Contract ABI

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Contract Creation Code

Decompile Bytecode Switch to Opcodes View

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Swarm Source

bzzr://7c2888b04e675c63e2fcd95ada8c4645e1b6e490b95f8c3ecdcf29cc9c08faca

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Multichain Portfolio | 31 Chains

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A contract address hosts a smart contract, which is a set of code stored on the blockchain that runs when predetermined conditions are met. Learn more about addresses in our Knowledge Base.

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