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Outline

• interface AxieIncubatorInterface
•    - function breedingFee()
•    - function requireEnoughExpForBreeding(
•    - function breedAxies(
• interface IERC721Base /* is IERC165 ...
•    - function balanceOf(address _owner)
•    - function ownerOf(uint256 _tokenId)
•    - function safeTransferFrom(address _fr ...
•    - function safeTransferFrom(address _fr ...
•    - function transferFrom(address _from, ...
•    - function approve(address _approved, u ...
•    - function setApprovalForAll(address _o ...
•    - function getApproved(uint256 _tokenId ...
•    - function isApprovedForAll(address _ow ...
•  contract Ownable
•    - function Ownable()
•    - function transferOwnership(address ne ...
•  contract Pausable is Ownable
•    - function pause()
•    - function unpause()
•  contract HasNoContracts is Ownable
•    - function reclaimContract(address cont ...
•  contract ERC20Basic
•    - function balanceOf(address who)
•    - function transfer(address to, uint256 ...
•  contract ERC20 is ERC20Basic
•    - function allowance(address owner, add ...
•    - function transferFrom(address from, a ...
•    - function approve(address spender, uin ...
• library SafeERC20
•    - function safeTransfer(ERC20Basic toke ...
•    - function safeTransferFrom(ERC20 token ...
•    - function safeApprove(ERC20 token, add ...
•  contract CanReclaimToken is Ownabl ...
•    - function reclaimToken(ERC20Basic toke ...
•  contract HasNoTokens is CanReclaim ...
•    - function tokenFallback(address from_, ...
•  contract AxieSiringClockAuction is ... *
•    - function ()
•    - function reclaimEther()
•    - function setCoreContract(address _cor ...
•    - function setIncubatorContract(address ...
•    - function getAuction(
•    - function getCurrentPrice(
•    - function createAuction(
•    - function bidOnSiring(
•    - function cancelAuction(uint256 _axieI ...
•    - function cancelAuctionWhenPaused(
•    - function _isOnAuction(Auction storage ...
•    - function _getCurrentPrice(
•    - function _computeCurrentPrice(
•    - function _addAuction(
•    - function _removeAuction(uint256 _axie ...
•    - function _cancelAuction(uint256 _axie ...
•    - function _escrow(address _owner, uint ...
•    - function _transfer(address _receiver, ...
•    - function _computeCut(uint256 _price)
•    - function _bid(

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/**
 *Submitted for verification at Etherscan.io on 2018-06-17
*/

pragma solidity ^0.4.23;

// File: contracts/breeding/AxieIncubatorInterface.sol

interface AxieIncubatorInterface {
  function breedingFee() external view returns (uint256);

  function requireEnoughExpForBreeding(
    uint256 _axieId
  )
    external
    view;

  function breedAxies(
    uint256 _sireId,
    uint256 _matronId,
    uint256 _birthPlace
  )
    external
    payable
    returns (uint256 _axieId);
}

// File: contracts/erc/erc721/IERC721Base.sol

/// @title ERC-721 Non-Fungible Token Standard
/// @dev See https://github.com/ethereum/EIPs/blob/master/EIPS/eip-721.md
///  Note: the ERC-165 identifier for this interface is 0x6466353c
interface IERC721Base /* is IERC165  */ {
  /// @dev This emits when ownership of any NFT changes by any mechanism.
  ///  This event emits when NFTs are created (`from` == 0) and destroyed
  ///  (`to` == 0). Exception: during contract creation, any number of NFTs
  ///  may be created and assigned without emitting Transfer. At the time of
  ///  any transfer, the approved address for that NFT (if any) is reset to none.
  event Transfer(address indexed _from, address indexed _to, uint256 _tokenId);

  /// @dev This emits when the approved address for an NFT is changed or
  ///  reaffirmed. The zero address indicates there is no approved address.
  ///  When a Transfer event emits, this also indicates that the approved
  ///  address for that NFT (if any) is reset to none.
  event Approval(address indexed _owner, address indexed _approved, uint256 _tokenId);

  /// @dev This emits when an operator is enabled or disabled for an owner.
  ///  The operator can manage all NFTs of the owner.
  event ApprovalForAll(address indexed _owner, address indexed _operator, bool _approved);

  /// @notice Count all NFTs assigned to an owner
  /// @dev NFTs assigned to the zero address are considered invalid, and this
  ///  function throws for queries about the zero address.
  /// @param _owner An address for whom to query the balance
  /// @return The number of NFTs owned by `_owner`, possibly zero
  function balanceOf(address _owner) external view returns (uint256);

  /// @notice Find the owner of an NFT
  /// @param _tokenId The identifier for an NFT
  /// @dev NFTs assigned to zero address are considered invalid, and queries
  ///  about them do throw.
  /// @return The address of the owner of the NFT
  function ownerOf(uint256 _tokenId) external view returns (address);

  /// @notice Transfers the ownership of an NFT from one address to another address
  /// @dev Throws unless `msg.sender` is the current owner, an authorized
  ///  operator, or the approved address for this NFT. Throws if `_from` is
  ///  not the current owner. Throws if `_to` is the zero address. Throws if
  ///  `_tokenId` is not a valid NFT. When transfer is complete, this function
  ///  checks if `_to` is a smart contract (code size > 0). If so, it calls
  ///  `onERC721Received` on `_to` and throws if the return value is not
  ///  `bytes4(keccak256("onERC721Received(address,uint256,bytes)"))`.
  /// @param _from The current owner of the NFT
  /// @param _to The new owner
  /// @param _tokenId The NFT to transfer
  /// @param _data Additional data with no specified format, sent in call to `_to`
  // solium-disable-next-line arg-overflow
  function safeTransferFrom(address _from, address _to, uint256 _tokenId, bytes _data) external payable;

  /// @notice Transfers the ownership of an NFT from one address to another address
  /// @dev This works identically to the other function with an extra data parameter,
  ///  except this function just sets data to []
  /// @param _from The current owner of the NFT
  /// @param _to The new owner
  /// @param _tokenId The NFT to transfer
  function safeTransferFrom(address _from, address _to, uint256 _tokenId) external payable;

  /// @notice Transfer ownership of an NFT -- THE CALLER IS RESPONSIBLE
  ///  TO CONFIRM THAT `_to` IS CAPABLE OF RECEIVING NFTS OR ELSE
  ///  THEY MAY BE PERMANENTLY LOST
  /// @dev Throws unless `msg.sender` is the current owner, an authorized
  ///  operator, or the approved address for this NFT. Throws if `_from` is
  ///  not the current owner. Throws if `_to` is the zero address. Throws if
  ///  `_tokenId` is not a valid NFT.
  /// @param _from The current owner of the NFT
  /// @param _to The new owner
  /// @param _tokenId The NFT to transfer
  function transferFrom(address _from, address _to, uint256 _tokenId) external payable;

  /// @notice Set or reaffirm the approved address for an NFT
  /// @dev The zero address indicates there is no approved address.
  /// @dev Throws unless `msg.sender` is the current NFT owner, or an authorized
  ///  operator of the current owner.
  /// @param _approved The new approved NFT controller
  /// @param _tokenId The NFT to approve
  function approve(address _approved, uint256 _tokenId) external payable;

  /// @notice Enable or disable approval for a third party ("operator") to manage
  ///  all your asset.
  /// @dev Emits the ApprovalForAll event
  /// @param _operator Address to add to the set of authorized operators.
  /// @param _approved True if the operators is approved, false to revoke approval
  function setApprovalForAll(address _operator, bool _approved) external;

  /// @notice Get the approved address for a single NFT
  /// @dev Throws if `_tokenId` is not a valid NFT
  /// @param _tokenId The NFT to find the approved address for
  /// @return The approved address for this NFT, or the zero address if there is none
  function getApproved(uint256 _tokenId) external view returns (address);

  /// @notice Query if an address is an authorized operator for another address
  /// @param _owner The address that owns the NFTs
  /// @param _operator The address that acts on behalf of the owner
  /// @return True if `_operator` is an approved operator for `_owner`, false otherwise
  function isApprovedForAll(address _owner, address _operator) external view returns (bool);
}

// File: zeppelin/contracts/ownership/Ownable.sol

/**
 * @title Ownable
 * @dev The Ownable contract has an owner address, and provides basic authorization control
 * functions, this simplifies the implementation of "user permissions".
 */
contract Ownable {
  address public owner;


  event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);


  /**
   * @dev The Ownable constructor sets the original `owner` of the contract to the sender
   * account.
   */
  function Ownable() {
    owner = msg.sender;
  }


  /**
   * @dev Throws if called by any account other than the owner.
   */
  modifier onlyOwner() {
    require(msg.sender == owner);
    _;
  }


  /**
   * @dev Allows the current owner to transfer control of the contract to a newOwner.
   * @param newOwner The address to transfer ownership to.
   */
  function transferOwnership(address newOwner) onlyOwner public {
    require(newOwner != address(0));
    OwnershipTransferred(owner, newOwner);
    owner = newOwner;
  }

}

// File: zeppelin/contracts/lifecycle/Pausable.sol

/**
 * @title Pausable
 * @dev Base contract which allows children to implement an emergency stop mechanism.
 */
contract Pausable is Ownable {
  event Pause();
  event Unpause();

  bool public paused = false;


  /**
   * @dev Modifier to make a function callable only when the contract is not paused.
   */
  modifier whenNotPaused() {
    require(!paused);
    _;
  }

  /**
   * @dev Modifier to make a function callable only when the contract is paused.
   */
  modifier whenPaused() {
    require(paused);
    _;
  }

  /**
   * @dev called by the owner to pause, triggers stopped state
   */
  function pause() onlyOwner whenNotPaused public {
    paused = true;
    Pause();
  }

  /**
   * @dev called by the owner to unpause, returns to normal state
   */
  function unpause() onlyOwner whenPaused public {
    paused = false;
    Unpause();
  }
}

// File: zeppelin/contracts/ownership/HasNoContracts.sol

/**
 * @title Contracts that should not own Contracts
 * @author Remco Bloemen <remco@2π.com>
 * @dev Should contracts (anything Ownable) end up being owned by this contract, it allows the owner
 * of this contract to reclaim ownership of the contracts.
 */
contract HasNoContracts is Ownable {

  /**
   * @dev Reclaim ownership of Ownable contracts
   * @param contractAddr The address of the Ownable to be reclaimed.
   */
  function reclaimContract(address contractAddr) external onlyOwner {
    Ownable contractInst = Ownable(contractAddr);
    contractInst.transferOwnership(owner);
  }
}

// File: zeppelin/contracts/token/ERC20Basic.sol

/**
 * @title ERC20Basic
 * @dev Simpler version of ERC20 interface
 * @dev see https://github.com/ethereum/EIPs/issues/179
 */
contract ERC20Basic {
  uint256 public totalSupply;
  function balanceOf(address who) public constant returns (uint256);
  function transfer(address to, uint256 value) public returns (bool);
  event Transfer(address indexed from, address indexed to, uint256 value);
}

// File: zeppelin/contracts/token/ERC20.sol

/**
 * @title ERC20 interface
 * @dev see https://github.com/ethereum/EIPs/issues/20
 */
contract ERC20 is ERC20Basic {
  function allowance(address owner, address spender) public constant returns (uint256);
  function transferFrom(address from, address to, uint256 value) public returns (bool);
  function approve(address spender, uint256 value) public returns (bool);
  event Approval(address indexed owner, address indexed spender, uint256 value);
}

// File: zeppelin/contracts/token/SafeERC20.sol

/**
 * @title SafeERC20
 * @dev Wrappers around ERC20 operations that throw on failure.
 * To use this library you can add a `using SafeERC20 for ERC20;` statement to your contract,
 * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
 */
library SafeERC20 {
  function safeTransfer(ERC20Basic token, address to, uint256 value) internal {
    assert(token.transfer(to, value));
  }

  function safeTransferFrom(ERC20 token, address from, address to, uint256 value) internal {
    assert(token.transferFrom(from, to, value));
  }

  function safeApprove(ERC20 token, address spender, uint256 value) internal {
    assert(token.approve(spender, value));
  }
}

// File: zeppelin/contracts/ownership/CanReclaimToken.sol

/**
 * @title Contracts that should be able to recover tokens
 * @author SylTi
 * @dev This allow a contract to recover any ERC20 token received in a contract by transferring the balance to the contract owner.
 * This will prevent any accidental loss of tokens.
 */
contract CanReclaimToken is Ownable {
  using SafeERC20 for ERC20Basic;

  /**
   * @dev Reclaim all ERC20Basic compatible tokens
   * @param token ERC20Basic The address of the token contract
   */
  function reclaimToken(ERC20Basic token) external onlyOwner {
    uint256 balance = token.balanceOf(this);
    token.safeTransfer(owner, balance);
  }

}

// File: zeppelin/contracts/ownership/HasNoTokens.sol

/**
 * @title Contracts that should not own Tokens
 * @author Remco Bloemen <remco@2π.com>
 * @dev This blocks incoming ERC23 tokens to prevent accidental loss of tokens.
 * Should tokens (any ERC20Basic compatible) end up in the contract, it allows the
 * owner to reclaim the tokens.
 */
contract HasNoTokens is CanReclaimToken {

 /**
  * @dev Reject all ERC23 compatible tokens
  * @param from_ address The address that is transferring the tokens
  * @param value_ uint256 the amount of the specified token
  * @param data_ Bytes The data passed from the caller.
  */
  function tokenFallback(address from_, uint256 value_, bytes data_) external {
    revert();
  }

}

// File: contracts/marketplace/AxieSiringClockAuction.sol

/// @title Clock auction for Axie siring.
contract AxieSiringClockAuction is HasNoContracts, HasNoTokens, Pausable {
  // Represents an auction on an NFT.
  struct Auction {
    // Current owner of NFT.
    address seller;
    // Price (in wei) at beginning of auction.
    uint128 startingPrice;
    // Price (in wei) at end of auction.
    uint128 endingPrice;
    // Duration (in seconds) of auction.
    uint64 duration;
    // Time when auction started.
    // NOTE: 0 if this auction has been concluded.
    uint64 startedAt;
  }

  // Cut owner takes on each auction, measured in basis points (1/100 of a percent).
  // Values 0-10,000 map to 0%-100%.
  uint256 public ownerCut;

  IERC721Base coreContract;
  AxieIncubatorInterface incubatorContract;

  // Map from Axie ID to their corresponding auction.
  mapping (uint256 => Auction) public auctions;

  event AuctionCreated(
    uint256 indexed _axieId,
    uint256 _startingPrice,
    uint256 _endingPrice,
    uint256 _duration,
    address _seller
  );

  event AuctionSuccessful(
    uint256 indexed _sireId,
    uint256 indexed _matronId,
    uint256 _totalPrice,
    address _winner
  );

  event AuctionCancelled(uint256 indexed _axieId);

  /// @dev Constructor creates a reference to the NFT ownership contract
  ///  and verifies the owner cut is in the valid range.
  /// @param _ownerCut - percent cut the owner takes on each auction, must be
  ///  between 0-10,000.
  constructor(uint256 _ownerCut) public {
    require(_ownerCut <= 10000);
    ownerCut = _ownerCut;
  }

  function () external payable onlyOwner {
  }

  // Modifiers to check that inputs can be safely stored with a certain
  // number of bits. We use constants and multiple modifiers to save gas.
  modifier canBeStoredWith64Bits(uint256 _value) {
    require(_value <= 18446744073709551615);
    _;
  }

  modifier canBeStoredWith128Bits(uint256 _value) {
    require(_value < 340282366920938463463374607431768211455);
    _;
  }

  function reclaimEther() external onlyOwner {
    owner.transfer(address(this).balance);
  }

  function setCoreContract(address _coreAddress) external onlyOwner {
    coreContract = IERC721Base(_coreAddress);
  }

  function setIncubatorContract(address _incubatorAddress) external onlyOwner {
    incubatorContract = AxieIncubatorInterface(_incubatorAddress);
  }

  /// @dev Returns auction info for an NFT on auction.
  /// @param _axieId - ID of NFT on auction.
  function getAuction(
    uint256 _axieId
  )
    external
    view
    returns (
      address seller,
      uint256 startingPrice,
      uint256 endingPrice,
      uint256 duration,
      uint256 startedAt
    )
  {
    Auction storage _auction = auctions[_axieId];
    require(_isOnAuction(_auction));
    return (
      _auction.seller,
      _auction.startingPrice,
      _auction.endingPrice,
      _auction.duration,
      _auction.startedAt
    );
  }

  /// @dev Returns the current price of an auction.
  /// @param _axieId - ID of the Axie price we are checking.
  function getCurrentPrice(
    uint256 _axieId
  )
    external
    view
    returns (uint256)
  {
    Auction storage _auction = auctions[_axieId];
    require(_isOnAuction(_auction));
    return _getCurrentPrice(_auction);
  }

  /// @dev Creates and begins a new auction.
  /// @param _axieId - ID of Axie to auction, sender must be owner.
  /// @param _startingPrice - Price of item (in wei) at beginning of auction.
  /// @param _endingPrice - Price of item (in wei) at end of auction.
  /// @param _duration - Length of time to move between starting
  ///  price and ending price (in seconds).
  function createAuction(
    uint256 _axieId,
    uint256 _startingPrice,
    uint256 _endingPrice,
    uint256 _duration
  )
    external
    whenNotPaused
    canBeStoredWith128Bits(_startingPrice)
    canBeStoredWith128Bits(_endingPrice)
    canBeStoredWith64Bits(_duration)
  {
    address _seller = msg.sender;

    require(coreContract.ownerOf(_axieId) == _seller);
    incubatorContract.requireEnoughExpForBreeding(_axieId); // Validate EXP for breeding.

    _escrow(_seller, _axieId);

    Auction memory _auction = Auction(
      _seller,
      uint128(_startingPrice),
      uint128(_endingPrice),
      uint64(_duration),
      uint64(now)
    );

    _addAuction(
      _axieId,
      _auction,
      _seller
    );
  }

  /// @dev Bids on an siring auction and completing it.
  /// @param _sireId - ID of Axie to bid on siring.
  /// @param _matronId - ID of matron Axie.
  function bidOnSiring(
    uint256 _sireId,
    uint256 _matronId,
    uint256 _birthPlace
  )
    external
    payable
    whenNotPaused
    returns (uint256 /* _axieId */)
  {
    Auction storage _auction = auctions[_sireId];
    require(_isOnAuction(_auction));

    require(msg.sender == coreContract.ownerOf(_matronId));

    // Save seller address here since `_bid` will clear it.
    address _seller = _auction.seller;

    // _bid will throw if the bid or funds transfer fails.
    _bid(_sireId, _matronId, msg.value, _auction);

    uint256 _axieId = incubatorContract.breedAxies.value(
      incubatorContract.breedingFee()
    )(
      _sireId,
      _matronId,
      _birthPlace
    );

    _transfer(_seller, _sireId);

    return _axieId;
  }

  /// @dev Cancels an auction that hasn't been won yet.
  ///  Returns the NFT to original owner.
  /// @notice This is a state-modifying function that can
  ///  be called while the contract is paused.
  /// @param _axieId - ID of Axie on auction.
  function cancelAuction(uint256 _axieId) external {
    Auction storage _auction = auctions[_axieId];
    require(_isOnAuction(_auction));
    require(msg.sender == _auction.seller);
    _cancelAuction(_axieId, _auction.seller);
  }

  /// @dev Cancels an auction when the contract is paused.
  ///  Only the owner may do this, and NFTs are returned to
  ///  the seller. This should only be used in emergencies.
  /// @param _axieId - ID of the NFT on auction to cancel.
  function cancelAuctionWhenPaused(
    uint256 _axieId
  )
    external
    whenPaused
    onlyOwner
  {
    Auction storage _auction = auctions[_axieId];
    require(_isOnAuction(_auction));
    _cancelAuction(_axieId, _auction.seller);
  }

  /// @dev Returns true if the NFT is on auction.
  /// @param _auction - Auction to check.
  function _isOnAuction(Auction storage _auction) internal view returns (bool) {
    return (_auction.startedAt > 0);
  }

  /// @dev Returns current price of an NFT on auction. Broken into two
  ///  functions (this one, that computes the duration from the auction
  ///  structure, and the other that does the price computation) so we
  ///  can easily test that the price computation works correctly.
  function _getCurrentPrice(
    Auction storage _auction
  )
    internal
    view
    returns (uint256)
  {
    uint256 _secondsPassed = 0;

    // A bit of insurance against negative values (or wraparound).
    // Probably not necessary (since Ethereum guarantees that the
    // now variable doesn't ever go backwards).
    if (now > _auction.startedAt) {
      _secondsPassed = now - _auction.startedAt;
    }

    return _computeCurrentPrice(
      _auction.startingPrice,
      _auction.endingPrice,
      _auction.duration,
      _secondsPassed
    );
  }

  /// @dev Computes the current price of an auction. Factored out
  ///  from _currentPrice so we can run extensive unit tests.
  ///  When testing, make this function external and turn on
  ///  `Current price computation` test suite.
  function _computeCurrentPrice(
    uint256 _startingPrice,
    uint256 _endingPrice,
    uint256 _duration,
    uint256 _secondsPassed
  )
    internal
    pure
    returns (uint256)
  {
    // NOTE: We don't use SafeMath (or similar) in this function because
    //  all of our external functions carefully cap the maximum values for
    //  time (at 64-bits) and currency (at 128-bits). _duration is
    //  also known to be non-zero (see the require() statement in
    //  _addAuction()).
    if (_secondsPassed >= _duration) {
      // We've reached the end of the dynamic pricing portion
      // of the auction, just return the end price.
      return _endingPrice;
    } else {
      // Starting price can be higher than ending price (and often is!), so
      // this delta can be negative.
      int256 _totalPriceChange = int256(_endingPrice) - int256(_startingPrice);

      // This multiplication can't overflow, _secondsPassed will easily fit within
      // 64-bits, and _totalPriceChange will easily fit within 128-bits, their product
      // will always fit within 256-bits.
      int256 _currentPriceChange = _totalPriceChange * int256(_secondsPassed) / int256(_duration);

      // _currentPriceChange can be negative, but if so, will have a magnitude
      // less that _startingPrice. Thus, this result will always end up positive.
      int256 _currentPrice = int256(_startingPrice) + _currentPriceChange;

      return uint256(_currentPrice);
    }
  }

  /// @dev Adds an auction to the list of open auctions. Also fires the
  ///  AuctionCreated event.
  /// @param _axieId The ID of the Axie to be put on auction.
  /// @param _auction Auction to add.
  function _addAuction(
    uint256 _axieId,
    Auction memory _auction,
    address _seller
  )
    internal
  {
    // Require that all auctions have a duration of
    // at least one minute. (Keeps our math from getting hairy!).
    require(_auction.duration >= 1 minutes);

    auctions[_axieId] = _auction;

    emit AuctionCreated(
      _axieId,
      uint256(_auction.startingPrice),
      uint256(_auction.endingPrice),
      uint256(_auction.duration),
      _seller
    );
  }

  /// @dev Removes an auction from the list of open auctions.
  /// @param _axieId - ID of NFT on auction.
  function _removeAuction(uint256 _axieId) internal {
    delete auctions[_axieId];
  }

  /// @dev Cancels an auction unconditionally.
  function _cancelAuction(uint256 _axieId, address _seller) internal {
    _removeAuction(_axieId);
    _transfer(_seller, _axieId);
    emit AuctionCancelled(_axieId);
  }

  /// @dev Escrows the NFT, assigning ownership to this contract.
  /// Throws if the escrow fails.
  /// @param _owner - Current owner address of Axie to escrow.
  /// @param _axieId - ID of Axie whose approval to verify.
  function _escrow(address _owner, uint256 _axieId) internal {
    // It will throw if transfer fails.
    coreContract.transferFrom(_owner, this, _axieId);
  }

  /// @dev Transfers an NFT owned by this contract to another address.
  /// Returns true if the transfer succeeds.
  /// @param _receiver - Address to transfer NFT to.
  /// @param _axieId - ID of Axie to transfer.
  function _transfer(address _receiver, uint256 _axieId) internal {
    // It will throw if transfer fails
    coreContract.transferFrom(this, _receiver, _axieId);
  }

  /// @dev Computes owner's cut of a sale.
  /// @param _price - Sale price of NFT.
  function _computeCut(uint256 _price) internal view returns (uint256) {
    // NOTE: We don't use SafeMath (or similar) in this function because
    //  all of our entry functions carefully cap the maximum values for
    //  currency (at 128-bits), and ownerCut <= 10000 (see the require()
    //  statement in the ClockAuction constructor). The result of this
    //  function is always guaranteed to be <= _price.
    return _price * ownerCut / 10000;
  }

  /// @dev Computes the price and transfers winnings.
  /// Does NOT transfer ownership of Axie.
  function _bid(
    uint256 _sireId,
    uint256 _matronId,
    uint256 _bidAmount,
    Auction storage _auction
  )
    internal
    returns (uint256)
  {
    // Check that the incoming bid is higher than the current price.
    uint256 _price = _getCurrentPrice(_auction);
    uint256 _priceWithFee = _price + incubatorContract.breedingFee();

    // Technically this shouldn't happen as `_price` fits in 128 bits.
    // However, we could set `breedingFee` to a very large number accidentally.
    assert(_priceWithFee >= _price);

    require(_bidAmount >= _priceWithFee);

    // Grab a reference to the seller before the auction struct
    // gets deleted.
    address _seller = _auction.seller;

    // The bid is good! Remove the auction before sending the fees
    // to the sender so we can't have a reentrancy attack.
    _removeAuction(_sireId);

    // Transfer proceeds to seller (if there are any!)
    if (_price > 0) {
      //  Calculate the auctioneer's cut.
      // (NOTE: _computeCut() is guaranteed to return a
      //  value <= price, so this subtraction can't go negative.)
      uint256 _auctioneerCut = _computeCut(_price);
      uint256 _sellerProceeds = _price - _auctioneerCut;

      // NOTE: Doing a transfer() in the middle of a complex
      // method like this is generally discouraged because of
      // reentrancy attacks and DoS attacks if the seller is
      // a contract with an invalid fallback function. We explicitly
      // guard against reentrancy attacks by removing the auction
      // before calling transfer(), and the only thing the seller
      // can DoS is the sale of their own asset! (And if it's an
      // accident, they can call cancelAuction().)
      _seller.transfer(_sellerProceeds);
    }

    if (_bidAmount > _priceWithFee) {
      // Calculate any excess funds included with the bid. If the excess
      // is anything worth worrying about, transfer it back to bidder.
      // NOTE: We checked above that the bid amount is greater than or
      // equal to the price so this cannot underflow.
      uint256 _bidExcess = _bidAmount - _priceWithFee;

      // Return the funds. Similar to the previous transfer, this is
      // not susceptible to a re-entry attack because the auction is
      // removed before any transfers occur.
      msg.sender.transfer(_bidExcess);
    }

    // Tell the world!
    emit AuctionSuccessful(
      _sireId,
      _matronId,
      _price,
      msg.sender
    );

    return _price;
  }
}

• No Contract Security Audit Submitted- Submit Audit Here

[{"constant":false,"inputs":[{"name":"token","type":"address"}],"name":"reclaimToken","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"name":"_incubatorAddress","type":"address"}],"name":"setIncubatorContract","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"name":"contractAddr","type":"address"}],"name":"reclaimContract","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[],"name":"unpause","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"name":"_axieId","type":"uint256"},{"name":"_startingPrice","type":"uint256"},{"name":"_endingPrice","type":"uint256"},{"name":"_duration","type":"uint256"}],"name":"createAuction","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"name":"_sireId","type":"uint256"},{"name":"_matronId","type":"uint256"},{"name":"_birthPlace","type":"uint256"}],"name":"bidOnSiring","outputs":[{"name":"","type":"uint256"}],"payable":true,"stateMutability":"payable","type":"function"},{"constant":true,"inputs":[{"name":"","type":"uint256"}],"name":"auctions","outputs":[{"name":"seller","type":"address"},{"name":"startingPrice","type":"uint128"},{"name":"endingPrice","type":"uint128"},{"name":"duration","type":"uint64"},{"name":"startedAt","type":"uint64"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"paused","outputs":[{"name":"","type":"bool"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"name":"_axieId","type":"uint256"}],"name":"getAuction","outputs":[{"name":"seller","type":"address"},{"name":"startingPrice","type":"uint256"},{"name":"endingPrice","type":"uint256"},{"name":"duration","type":"uint256"},{"name":"startedAt","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"ownerCut","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[],"name":"pause","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"name":"_axieId","type":"uint256"}],"name":"cancelAuctionWhenPaused","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"owner","outputs":[{"name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"_axieId","type":"uint256"}],"name":"cancelAuction","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[],"name":"reclaimEther","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"name":"from_","type":"address"},{"name":"value_","type":"uint256"},{"name":"data_","type":"bytes"}],"name":"tokenFallback","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[{"name":"_axieId","type":"uint256"}],"name":"getCurrentPrice","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"_coreAddress","type":"address"}],"name":"setCoreContract","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"inputs":[{"name":"_ownerCut","type":"uint256"}],"payable":false,"stateMutability":"nonpayable","type":"constructor"},{"payable":true,"stateMutability":"payable","type":"fallback"},{"anonymous":false,"inputs":[{"indexed":true,"name":"_axieId","type":"uint256"},{"indexed":false,"name":"_startingPrice","type":"uint256"},{"indexed":false,"name":"_endingPrice","type":"uint256"},{"indexed":false,"name":"_duration","type":"uint256"},{"indexed":false,"name":"_seller","type":"address"}],"name":"AuctionCreated","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"name":"_sireId","type":"uint256"},{"indexed":true,"name":"_matronId","type":"uint256"},{"indexed":false,"name":"_totalPrice","type":"uint256"},{"indexed":false,"name":"_winner","type":"address"}],"name":"AuctionSuccessful","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"name":"_axieId","type":"uint256"}],"name":"AuctionCancelled","type":"event"},{"anonymous":false,"inputs":[],"name":"Pause","type":"event"},{"anonymous":false,"inputs":[],"name":"Unpause","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"name":"previousOwner","type":"address"},{"indexed":true,"name":"newOwner","type":"address"}],"name":"OwnershipTransferred","type":"event"}]

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00000000000000000000000000000000000000000000000000000000000001a9

-----Decoded View---------------
Arg [0] : _ownerCut (uint256): 425

-----Encoded View---------------
1 Constructor Arguments found :
Arg [0] : 00000000000000000000000000000000000000000000000000000000000001a9

bzzr://e56d3153113d562066e0dc44d74e5cf4202ea416ca90384fde9d1d33db512822