Contract 0x066ff66561f7670ce6ff5bbf40396ccc69b9e872 7

 
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0xd1ce3e2eb381e400b917d03921b6eb0ac2d08b72b52b702abfb24c9beaecd333Transfer786353032023-03-05 0:02:43359 days 11 hrs ago0x51e13c4fdbc2690677eb0261ac1fc5cd1a1d0659 IN  0x066ff66561f7670ce6ff5bbf40396ccc69b9e8720 ETH0.000089437160.001
0x0f1fb2a8d2b4b46c7ec329f10adf8e077e9163f413265105de7bf6ee4e038029Transfer786350662023-03-05 0:00:11359 days 11 hrs ago0xe1c0e5ac8ab0dab88e682b9a8653bc7a943fb80f IN  0x066ff66561f7670ce6ff5bbf40396ccc69b9e8720 ETH0.0000903377330.015
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0x21a69391504bea9226c60ba8f74c8e1c1abb8ecdaa8371c7f49c517f192e2460Swap202977992022-08-23 14:36:14552 days 20 hrs ago0x7719e324d758dc4b140d215ff8b999f5ac1c7f45 IN  0x066ff66561f7670ce6ff5bbf40396ccc69b9e8720 ETH0.000315566060.001
0xf8afb697869d3e08b57f79403b2f8bda0bcc78673490d04c8df5fa8494ac65fcSwap200157092022-08-21 7:36:28555 days 3 hrs ago0x7719e324d758dc4b140d215ff8b999f5ac1c7f45 IN  0x066ff66561f7670ce6ff5bbf40396ccc69b9e8720 ETH0.000020033550.001
0x391836760bae6c970c250d33e2d1808c2721a0ef563ea774e809ef7be37fbe89Swap199940252022-08-21 2:10:10555 days 8 hrs ago0x7719e324d758dc4b140d215ff8b999f5ac1c7f45 IN  0x066ff66561f7670ce6ff5bbf40396ccc69b9e8720 ETH0.0000508413780.001
0x2dd10831f2d936a961b6dd208a42a4740fb3d45e86bc94e2ce2a928bb43eb820Swap199940172022-08-21 2:10:10555 days 8 hrs ago0x7719e324d758dc4b140d215ff8b999f5ac1c7f45 IN  0x066ff66561f7670ce6ff5bbf40396ccc69b9e8720 ETH0.000050664810.001
0xa1498ddec507d58dd82820bc25dbd51c1d91049c980f38c45a36892aa93bf7dcSwap199826952022-08-20 23:21:33555 days 11 hrs ago0x7719e324d758dc4b140d215ff8b999f5ac1c7f45 IN  0x066ff66561f7670ce6ff5bbf40396ccc69b9e8720 ETH0.0000240478880.001
0x27bdc5e2f69d37f417870c639689d40143b111a0651a3a29c3a6fb88b3834120Transfer70843192022-05-04 22:49:21663 days 12 hrs ago0xdd3d26430f37e9018e1c63761def6dda81aa07ba IN  0x066ff66561f7670ce6ff5bbf40396ccc69b9e8720 ETH0.0001449202650.001
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0x3026540bfb5345d65a08236efcc85f55d16b9b0e248eb6d364ef08a9552483351075556602023-07-30 9:41:37212 days 1 hr ago 0x066ff66561f7670ce6ff5bbf40396ccc69b9e872 0x7f5c764cbc14f9669b88837ca1490cca17c316070 ETH
0x3026540bfb5345d65a08236efcc85f55d16b9b0e248eb6d364ef08a9552483351075556602023-07-30 9:41:37212 days 1 hr ago 0x066ff66561f7670ce6ff5bbf40396ccc69b9e872Wrapped Ether0 ETH
0x3026540bfb5345d65a08236efcc85f55d16b9b0e248eb6d364ef08a9552483351075556602023-07-30 9:41:37212 days 1 hr ago 0x066ff66561f7670ce6ff5bbf40396ccc69b9e872Wrapped Ether0 ETH
0x3026540bfb5345d65a08236efcc85f55d16b9b0e248eb6d364ef08a9552483351075556602023-07-30 9:41:37212 days 1 hr ago 0x4c5d5234f232bd2d76b96aa33f5ae4fcf0e4bfab 0x066ff66561f7670ce6ff5bbf40396ccc69b9e8720 ETH
0x3026540bfb5345d65a08236efcc85f55d16b9b0e248eb6d364ef08a9552483351075556602023-07-30 9:41:37212 days 1 hr ago 0x4c5d5234f232bd2d76b96aa33f5ae4fcf0e4bfab 0x066ff66561f7670ce6ff5bbf40396ccc69b9e8720 ETH
0xf6753f574b7a1ad335cef9a20531276dfd85325d0cbe419c7652c756610489771075550082023-07-30 9:19:53212 days 1 hr ago 0x066ff66561f7670ce6ff5bbf40396ccc69b9e872 0x7f5c764cbc14f9669b88837ca1490cca17c316070 ETH
0xf6753f574b7a1ad335cef9a20531276dfd85325d0cbe419c7652c756610489771075550082023-07-30 9:19:53212 days 1 hr ago 0x066ff66561f7670ce6ff5bbf40396ccc69b9e872Wrapped Ether0 ETH
0xf6753f574b7a1ad335cef9a20531276dfd85325d0cbe419c7652c756610489771075550082023-07-30 9:19:53212 days 1 hr ago 0x066ff66561f7670ce6ff5bbf40396ccc69b9e872 0x7f5c764cbc14f9669b88837ca1490cca17c316070 ETH
0xf6753f574b7a1ad335cef9a20531276dfd85325d0cbe419c7652c756610489771075550082023-07-30 9:19:53212 days 1 hr ago 0x4c5d5234f232bd2d76b96aa33f5ae4fcf0e4bfab 0x066ff66561f7670ce6ff5bbf40396ccc69b9e8720 ETH
0xf6753f574b7a1ad335cef9a20531276dfd85325d0cbe419c7652c756610489771075550082023-07-30 9:19:53212 days 1 hr ago 0x4c5d5234f232bd2d76b96aa33f5ae4fcf0e4bfab 0x066ff66561f7670ce6ff5bbf40396ccc69b9e8720 ETH
0x2d1e0cf8bafa9796e1f156a7f59da6fb5a29291d97dc74eddc8d84f44cff5d741075545942023-07-30 9:06:05212 days 2 hrs ago 0x066ff66561f7670ce6ff5bbf40396ccc69b9e872 0x7f5c764cbc14f9669b88837ca1490cca17c316070 ETH
0x2d1e0cf8bafa9796e1f156a7f59da6fb5a29291d97dc74eddc8d84f44cff5d741075545942023-07-30 9:06:05212 days 2 hrs ago 0x066ff66561f7670ce6ff5bbf40396ccc69b9e872Wrapped Ether0 ETH
0x2d1e0cf8bafa9796e1f156a7f59da6fb5a29291d97dc74eddc8d84f44cff5d741075545942023-07-30 9:06:05212 days 2 hrs ago 0x066ff66561f7670ce6ff5bbf40396ccc69b9e872 0x7f5c764cbc14f9669b88837ca1490cca17c316070 ETH
0x2d1e0cf8bafa9796e1f156a7f59da6fb5a29291d97dc74eddc8d84f44cff5d741075545942023-07-30 9:06:05212 days 2 hrs ago 0xc160e4fe967f8ada7b58d9c578267ebbec1e7a63 0x066ff66561f7670ce6ff5bbf40396ccc69b9e8720 ETH
0x2d1e0cf8bafa9796e1f156a7f59da6fb5a29291d97dc74eddc8d84f44cff5d741075545942023-07-30 9:06:05212 days 2 hrs ago 0xc160e4fe967f8ada7b58d9c578267ebbec1e7a63 0x066ff66561f7670ce6ff5bbf40396ccc69b9e8720 ETH
0xb57b8116288a5bf9351690d7179fbad06a61040b8399697ee78bcdd8535b70471075464712023-07-30 4:35:19212 days 6 hrs ago 0x066ff66561f7670ce6ff5bbf40396ccc69b9e872 0x7f5c764cbc14f9669b88837ca1490cca17c316070 ETH
0xb57b8116288a5bf9351690d7179fbad06a61040b8399697ee78bcdd8535b70471075464712023-07-30 4:35:19212 days 6 hrs ago 0x066ff66561f7670ce6ff5bbf40396ccc69b9e872Wrapped Ether0 ETH
0xb57b8116288a5bf9351690d7179fbad06a61040b8399697ee78bcdd8535b70471075464712023-07-30 4:35:19212 days 6 hrs ago 0x066ff66561f7670ce6ff5bbf40396ccc69b9e872Wrapped Ether0 ETH
0xb57b8116288a5bf9351690d7179fbad06a61040b8399697ee78bcdd8535b70471075464712023-07-30 4:35:19212 days 6 hrs ago 0x4c5d5234f232bd2d76b96aa33f5ae4fcf0e4bfab 0x066ff66561f7670ce6ff5bbf40396ccc69b9e8720 ETH
0xb57b8116288a5bf9351690d7179fbad06a61040b8399697ee78bcdd8535b70471075464712023-07-30 4:35:19212 days 6 hrs ago 0x4c5d5234f232bd2d76b96aa33f5ae4fcf0e4bfab 0x066ff66561f7670ce6ff5bbf40396ccc69b9e8720 ETH
0x1a9414af583859e73cf474f5fdc475a9cac535bfc43b0a14d154a6e5134ed18a1075448062023-07-30 3:39:49212 days 7 hrs ago 0x066ff66561f7670ce6ff5bbf40396ccc69b9e872 0x7f5c764cbc14f9669b88837ca1490cca17c316070 ETH
0x1a9414af583859e73cf474f5fdc475a9cac535bfc43b0a14d154a6e5134ed18a1075448062023-07-30 3:39:49212 days 7 hrs ago 0x066ff66561f7670ce6ff5bbf40396ccc69b9e872Wrapped Ether0 ETH
0x1a9414af583859e73cf474f5fdc475a9cac535bfc43b0a14d154a6e5134ed18a1075448062023-07-30 3:39:49212 days 7 hrs ago 0x066ff66561f7670ce6ff5bbf40396ccc69b9e872Wrapped Ether0 ETH
0x1a9414af583859e73cf474f5fdc475a9cac535bfc43b0a14d154a6e5134ed18a1075448062023-07-30 3:39:49212 days 7 hrs ago 0xc160e4fe967f8ada7b58d9c578267ebbec1e7a63 0x066ff66561f7670ce6ff5bbf40396ccc69b9e8720 ETH
0x1a9414af583859e73cf474f5fdc475a9cac535bfc43b0a14d154a6e5134ed18a1075448062023-07-30 3:39:49212 days 7 hrs ago 0xc160e4fe967f8ada7b58d9c578267ebbec1e7a63 0x066ff66561f7670ce6ff5bbf40396ccc69b9e8720 ETH
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Similar Match Source Code
This contract matches the deployed Bytecode of the Source Code for Contract 0x2F7708FD509D7a60acE6aB22e1e19b3D60e4f77a
The constructor portion of the code might be different and could alter the actual behaviour of the contract

Contract Name:
ElkPair

Compiler Version
v0.5.16+commit.9c3226ce

Optimization Enabled:
Yes with 1000 runs

Other Settings:
default evmVersion, MIT license

Contract Source Code (Solidity)

/**
 *Submitted for verification at Optimistic.Etherscan.io on 2022-05-09
*/

// Sources flattened with hardhat v2.0.6 https://hardhat.org

// File contracts/elk-core/interfaces/IElkFactory.sol

pragma solidity >=0.5.0;

interface IElkFactory {
    event PairCreated(address indexed token0, address indexed token1, address pair, uint);

    function feeTo() external view returns (address);
    function feeToSetter() external view returns (address);

    function getPair(address tokenA, address tokenB) external view returns (address pair);
    function allPairs(uint) external view returns (address pair);
    function allPairsLength() external view returns (uint);

    function createPair(address tokenA, address tokenB) external returns (address pair);

    function setFeeTo(address) external;
    function setFeeToSetter(address) external;
}


// File contracts/elk-core/interfaces/IElkPair.sol

pragma solidity >=0.5.0;

interface IElkPair {
    event Approval(address indexed owner, address indexed spender, uint value);
    event Transfer(address indexed from, address indexed to, uint value);

    function name() external pure returns (string memory);
    function symbol() external pure returns (string memory);
    function decimals() external pure returns (uint8);
    function totalSupply() external view returns (uint);
    function balanceOf(address owner) external view returns (uint);
    function allowance(address owner, address spender) external view returns (uint);

    function approve(address spender, uint value) external returns (bool);
    function transfer(address to, uint value) external returns (bool);
    function transferFrom(address from, address to, uint value) external returns (bool);

    function DOMAIN_SEPARATOR() external view returns (bytes32);
    function PERMIT_TYPEHASH() external pure returns (bytes32);
    function nonces(address owner) external view returns (uint);

    function permit(address owner, address spender, uint value, uint deadline, uint8 v, bytes32 r, bytes32 s) external;

    event Mint(address indexed sender, uint amount0, uint amount1);
    event Burn(address indexed sender, uint amount0, uint amount1, address indexed to);
    event Swap(
        address indexed sender,
        uint amount0In,
        uint amount1In,
        uint amount0Out,
        uint amount1Out,
        address indexed to
    );
    event Sync(uint112 reserve0, uint112 reserve1);

    function MINIMUM_LIQUIDITY() external pure returns (uint);
    function factory() external view returns (address);
    function token0() external view returns (address);
    function token1() external view returns (address);
    function getReserves() external view returns (uint112 reserve0, uint112 reserve1, uint32 blockTimestampLast);
    function price0CumulativeLast() external view returns (uint);
    function price1CumulativeLast() external view returns (uint);
    function kLast() external view returns (uint);

    function mint(address to) external returns (uint liquidity);
    function burn(address to) external returns (uint amount0, uint amount1);
    function swap(uint amount0Out, uint amount1Out, address to, bytes calldata data) external;
    function skim(address to) external;
    function sync() external;

    function initialize(address, address) external;
}


// File contracts/elk-core/interfaces/IElkERC20.sol

pragma solidity >=0.5.0;

interface IElkERC20 {
    event Approval(address indexed owner, address indexed spender, uint value);
    event Transfer(address indexed from, address indexed to, uint value);

    function name() external pure returns (string memory);
    function symbol() external pure returns (string memory);
    function decimals() external pure returns (uint8);
    function totalSupply() external view returns (uint);
    function balanceOf(address owner) external view returns (uint);
    function allowance(address owner, address spender) external view returns (uint);

    function approve(address spender, uint value) external returns (bool);
    function transfer(address to, uint value) external returns (bool);
    function transferFrom(address from, address to, uint value) external returns (bool);

    function DOMAIN_SEPARATOR() external view returns (bytes32);
    function PERMIT_TYPEHASH() external pure returns (bytes32);
    function nonces(address owner) external view returns (uint);

    function permit(address owner, address spender, uint value, uint deadline, uint8 v, bytes32 r, bytes32 s) external;
}


// File contracts/elk-core/libraries/SafeMath.sol

pragma solidity =0.5.16;

// a library for performing overflow-safe math, courtesy of DappHub (https://github.com/dapphub/ds-math)

library SafeMath {
    function add(uint x, uint y) internal pure returns (uint z) {
        require((z = x + y) >= x, 'ds-math-add-overflow');
    }

    function sub(uint x, uint y) internal pure returns (uint z) {
        require((z = x - y) <= x, 'ds-math-sub-underflow');
    }

    function mul(uint x, uint y) internal pure returns (uint z) {
        require(y == 0 || (z = x * y) / y == x, 'ds-math-mul-overflow');
    }
}


// File contracts/elk-core/ElkERC20.sol

pragma solidity =0.5.16;


contract ElkERC20 is IElkERC20 {
    using SafeMath for uint;

    string public constant name = 'Elk Liquidity';
    string public constant symbol = 'ELP';
    uint8 public constant decimals = 18;
    uint  public totalSupply;
    mapping(address => uint) public balanceOf;
    mapping(address => mapping(address => uint)) public allowance;

    bytes32 public DOMAIN_SEPARATOR;
    // keccak256("Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)");
    bytes32 public constant PERMIT_TYPEHASH = 0x6e71edae12b1b97f4d1f60370fef10105fa2faae0126114a169c64845d6126c9;
    mapping(address => uint) public nonces;

    event Approval(address indexed owner, address indexed spender, uint value);
    event Transfer(address indexed from, address indexed to, uint value);

    constructor() public {
        uint chainId;
        assembly {
            chainId := chainid
        }
        DOMAIN_SEPARATOR = keccak256(
            abi.encode(
                keccak256('EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)'),
                keccak256(bytes(name)),
                keccak256(bytes('1')),
                chainId,
                address(this)
            )
        );
    }

    function _mint(address to, uint value) internal {
        totalSupply = totalSupply.add(value);
        balanceOf[to] = balanceOf[to].add(value);
        emit Transfer(address(0), to, value);
    }

    function _burn(address from, uint value) internal {
        balanceOf[from] = balanceOf[from].sub(value);
        totalSupply = totalSupply.sub(value);
        emit Transfer(from, address(0), value);
    }

    function _approve(address owner, address spender, uint value) private {
        allowance[owner][spender] = value;
        emit Approval(owner, spender, value);
    }

    function _transfer(address from, address to, uint value) private {
        balanceOf[from] = balanceOf[from].sub(value);
        balanceOf[to] = balanceOf[to].add(value);
        emit Transfer(from, to, value);
    }

    function approve(address spender, uint value) external returns (bool) {
        _approve(msg.sender, spender, value);
        return true;
    }

    function transfer(address to, uint value) external returns (bool) {
        _transfer(msg.sender, to, value);
        return true;
    }

    function transferFrom(address from, address to, uint value) external returns (bool) {
        if (allowance[from][msg.sender] != uint(-1)) {
            allowance[from][msg.sender] = allowance[from][msg.sender].sub(value);
        }
        _transfer(from, to, value);
        return true;
    }

    function permit(address owner, address spender, uint value, uint deadline, uint8 v, bytes32 r, bytes32 s) external {
        require(deadline >= block.timestamp, 'Elk: EXPIRED');
        bytes32 digest = keccak256(
            abi.encodePacked(
                '\x19\x01',
                DOMAIN_SEPARATOR,
                keccak256(abi.encode(PERMIT_TYPEHASH, owner, spender, value, nonces[owner]++, deadline))
            )
        );
        address recoveredAddress = ecrecover(digest, v, r, s);
        require(recoveredAddress != address(0) && recoveredAddress == owner, 'Elk: INVALID_SIGNATURE');
        _approve(owner, spender, value);
    }
}


// File contracts/elk-core/libraries/Math.sol

pragma solidity =0.5.16;

// a library for performing various math operations

library Math {
    function min(uint x, uint y) internal pure returns (uint z) {
        z = x < y ? x : y;
    }

    // babylonian method (https://en.wikipedia.org/wiki/Methods_of_computing_square_roots#Babylonian_method)
    function sqrt(uint y) internal pure returns (uint z) {
        if (y > 3) {
            z = y;
            uint x = y / 2 + 1;
            while (x < z) {
                z = x;
                x = (y / x + x) / 2;
            }
        } else if (y != 0) {
            z = 1;
        }
    }
}


// File contracts/elk-core/libraries/UQ112x112.sol

pragma solidity =0.5.16;

// a library for handling binary fixed point numbers (https://en.wikipedia.org/wiki/Q_(number_format))

// range: [0, 2**112 - 1]
// resolution: 1 / 2**112

library UQ112x112 {
    uint224 constant Q112 = 2**112;

    // encode a uint112 as a UQ112x112
    function encode(uint112 y) internal pure returns (uint224 z) {
        z = uint224(y) * Q112; // never overflows
    }

    // divide a UQ112x112 by a uint112, returning a UQ112x112
    function uqdiv(uint224 x, uint112 y) internal pure returns (uint224 z) {
        z = x / uint224(y);
    }
}


// File contracts/elk-core/interfaces/IERC20.sol

pragma solidity >=0.5.0;

interface IERC20 {
    event Approval(address indexed owner, address indexed spender, uint value);
    event Transfer(address indexed from, address indexed to, uint value);

    function name() external view returns (string memory);
    function symbol() external view returns (string memory);
    function decimals() external view returns (uint8);
    function totalSupply() external view returns (uint);
    function balanceOf(address owner) external view returns (uint);
    function allowance(address owner, address spender) external view returns (uint);

    function approve(address spender, uint value) external returns (bool);
    function transfer(address to, uint value) external returns (bool);
    function transferFrom(address from, address to, uint value) external returns (bool);
}


// File contracts/elk-core/interfaces/IElkCallee.sol

pragma solidity >=0.5.0;

interface IElkCallee {
    function elkCall(address sender, uint amount0, uint amount1, bytes calldata data) external;
}


// File contracts/elk-core/ElkPair.sol

pragma solidity =0.5.16;







contract ElkPair is IElkPair, ElkERC20 {
    using SafeMath  for uint;
    using UQ112x112 for uint224;

    uint public constant MINIMUM_LIQUIDITY = 10**3;
    bytes4 private constant SELECTOR = bytes4(keccak256(bytes('transfer(address,uint256)')));

    address public factory;
    address public token0;
    address public token1;

    uint112 private reserve0;           // uses single storage slot, accessible via getReserves
    uint112 private reserve1;           // uses single storage slot, accessible via getReserves
    uint32  private blockTimestampLast; // uses single storage slot, accessible via getReserves

    uint public price0CumulativeLast;
    uint public price1CumulativeLast;
    uint public kLast; // reserve0 * reserve1, as of immediately after the most recent liquidity event

    uint private unlocked = 1;
    modifier lock() {
        require(unlocked == 1, 'Elk: LOCKED');
        unlocked = 0;
        _;
        unlocked = 1;
    }

    function getReserves() public view returns (uint112 _reserve0, uint112 _reserve1, uint32 _blockTimestampLast) {
        _reserve0 = reserve0;
        _reserve1 = reserve1;
        _blockTimestampLast = blockTimestampLast;
    }

    function _safeTransfer(address token, address to, uint value) private {
        (bool success, bytes memory data) = token.call(abi.encodeWithSelector(SELECTOR, to, value));
        require(success && (data.length == 0 || abi.decode(data, (bool))), 'Elk: TRANSFER_FAILED');
    }

    event Mint(address indexed sender, uint amount0, uint amount1);
    event Burn(address indexed sender, uint amount0, uint amount1, address indexed to);
    event Swap(
        address indexed sender,
        uint amount0In,
        uint amount1In,
        uint amount0Out,
        uint amount1Out,
        address indexed to
    );
    event Sync(uint112 reserve0, uint112 reserve1);

    constructor() public {
        factory = msg.sender;
    }

    // called once by the factory at time of deployment
    function initialize(address _token0, address _token1) external {
        require(msg.sender == factory, 'Elk: FORBIDDEN'); // sufficient check
        token0 = _token0;
        token1 = _token1;
    }

    // update reserves and, on the first call per block, price accumulators
    function _update(uint balance0, uint balance1, uint112 _reserve0, uint112 _reserve1) private {
        require(balance0 <= uint112(-1) && balance1 <= uint112(-1), 'Elk: OVERFLOW');
        uint32 blockTimestamp = uint32(block.timestamp % 2**32);
        uint32 timeElapsed = blockTimestamp - blockTimestampLast; // overflow is desired
        if (timeElapsed > 0 && _reserve0 != 0 && _reserve1 != 0) {
            // * never overflows, and + overflow is desired
            price0CumulativeLast += uint(UQ112x112.encode(_reserve1).uqdiv(_reserve0)) * timeElapsed;
            price1CumulativeLast += uint(UQ112x112.encode(_reserve0).uqdiv(_reserve1)) * timeElapsed;
        }
        reserve0 = uint112(balance0);
        reserve1 = uint112(balance1);
        blockTimestampLast = blockTimestamp;
        emit Sync(reserve0, reserve1);
    }

    // if fee is on, mint liquidity equivalent to 1/6th of the growth in sqrt(k)
    function _mintFee(uint112 _reserve0, uint112 _reserve1) private returns (bool feeOn) {
        address feeTo = IElkFactory(factory).feeTo();
        feeOn = feeTo != address(0);
        uint _kLast = kLast; // gas savings
        if (feeOn) {
            if (_kLast != 0) {
                uint rootK = Math.sqrt(uint(_reserve0).mul(_reserve1));
                uint rootKLast = Math.sqrt(_kLast);
                if (rootK > rootKLast) {
                    uint numerator = totalSupply.mul(rootK.sub(rootKLast));
                    uint denominator = rootK.mul(5).add(rootKLast);
                    uint liquidity = numerator / denominator;
                    if (liquidity > 0) _mint(feeTo, liquidity);
                }
            }
        } else if (_kLast != 0) {
            kLast = 0;
        }
    }

    // this low-level function should be called from a contract which performs important safety checks
    function mint(address to) external lock returns (uint liquidity) {
        (uint112 _reserve0, uint112 _reserve1,) = getReserves(); // gas savings
        uint balance0 = IERC20(token0).balanceOf(address(this));
        uint balance1 = IERC20(token1).balanceOf(address(this));
        uint amount0 = balance0.sub(_reserve0);
        uint amount1 = balance1.sub(_reserve1);

        bool feeOn = _mintFee(_reserve0, _reserve1);
        uint _totalSupply = totalSupply; // gas savings, must be defined here since totalSupply can update in _mintFee
        if (_totalSupply == 0) {
            liquidity = Math.sqrt(amount0.mul(amount1)).sub(MINIMUM_LIQUIDITY);
           _mint(address(0), MINIMUM_LIQUIDITY); // permanently lock the first MINIMUM_LIQUIDITY tokens
        } else {
            liquidity = Math.min(amount0.mul(_totalSupply) / _reserve0, amount1.mul(_totalSupply) / _reserve1);
        }
        require(liquidity > 0, 'Elk: INSUFFICIENT_LIQUIDITY_MINTED');
        _mint(to, liquidity);

        _update(balance0, balance1, _reserve0, _reserve1);
        if (feeOn) kLast = uint(reserve0).mul(reserve1); // reserve0 and reserve1 are up-to-date
        emit Mint(msg.sender, amount0, amount1);
    }

    // this low-level function should be called from a contract which performs important safety checks
    function burn(address to) external lock returns (uint amount0, uint amount1) {
        (uint112 _reserve0, uint112 _reserve1,) = getReserves(); // gas savings
        address _token0 = token0;                                // gas savings
        address _token1 = token1;                                // gas savings
        uint balance0 = IERC20(_token0).balanceOf(address(this));
        uint balance1 = IERC20(_token1).balanceOf(address(this));
        uint liquidity = balanceOf[address(this)];

        bool feeOn = _mintFee(_reserve0, _reserve1);
        uint _totalSupply = totalSupply; // gas savings, must be defined here since totalSupply can update in _mintFee
        amount0 = liquidity.mul(balance0) / _totalSupply; // using balances ensures pro-rata distribution
        amount1 = liquidity.mul(balance1) / _totalSupply; // using balances ensures pro-rata distribution
        require(amount0 > 0 && amount1 > 0, 'Elk: INSUFFICIENT_LIQUIDITY_BURNED');
        _burn(address(this), liquidity);
        _safeTransfer(_token0, to, amount0);
        _safeTransfer(_token1, to, amount1);
        balance0 = IERC20(_token0).balanceOf(address(this));
        balance1 = IERC20(_token1).balanceOf(address(this));

        _update(balance0, balance1, _reserve0, _reserve1);
        if (feeOn) kLast = uint(reserve0).mul(reserve1); // reserve0 and reserve1 are up-to-date
        emit Burn(msg.sender, amount0, amount1, to);
    }

    // this low-level function should be called from a contract which performs important safety checks
    function swap(uint amount0Out, uint amount1Out, address to, bytes calldata data) external lock {
        require(amount0Out > 0 || amount1Out > 0, 'Elk: INSUFFICIENT_OUTPUT_AMOUNT');
        (uint112 _reserve0, uint112 _reserve1,) = getReserves(); // gas savings
        require(amount0Out < _reserve0 && amount1Out < _reserve1, 'Elk: INSUFFICIENT_LIQUIDITY');

        uint balance0;
        uint balance1;
        { // scope for _token{0,1}, avoids stack too deep errors
        address _token0 = token0;
        address _token1 = token1;
        require(to != _token0 && to != _token1, 'Elk: INVALID_TO');
        if (amount0Out > 0) _safeTransfer(_token0, to, amount0Out); // optimistically transfer tokens
        if (amount1Out > 0) _safeTransfer(_token1, to, amount1Out); // optimistically transfer tokens
        if (data.length > 0) IElkCallee(to).elkCall(msg.sender, amount0Out, amount1Out, data);
        balance0 = IERC20(_token0).balanceOf(address(this));
        balance1 = IERC20(_token1).balanceOf(address(this));
        }
        uint amount0In = balance0 > _reserve0 - amount0Out ? balance0 - (_reserve0 - amount0Out) : 0;
        uint amount1In = balance1 > _reserve1 - amount1Out ? balance1 - (_reserve1 - amount1Out) : 0;
        require(amount0In > 0 || amount1In > 0, 'Elk: INSUFFICIENT_INPUT_AMOUNT');
        { // scope for reserve{0,1}Adjusted, avoids stack too deep errors
        uint balance0Adjusted = balance0.mul(1000).sub(amount0In.mul(3));
        uint balance1Adjusted = balance1.mul(1000).sub(amount1In.mul(3));
        require(balance0Adjusted.mul(balance1Adjusted) >= uint(_reserve0).mul(_reserve1).mul(1000**2), 'Elk: K');
        }

        _update(balance0, balance1, _reserve0, _reserve1);
        emit Swap(msg.sender, amount0In, amount1In, amount0Out, amount1Out, to);
    }

    // force balances to match reserves
    function skim(address to) external lock {
        address _token0 = token0; // gas savings
        address _token1 = token1; // gas savings
        _safeTransfer(_token0, to, IERC20(_token0).balanceOf(address(this)).sub(reserve0));
        _safeTransfer(_token1, to, IERC20(_token1).balanceOf(address(this)).sub(reserve1));
    }

    // force reserves to match balances
    function sync() external lock {
        _update(IERC20(token0).balanceOf(address(this)), IERC20(token1).balanceOf(address(this)), reserve0, reserve1);
    }
}

Contract Security Audit

Contract ABI

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ion"},{"constant":true,"inputs":[],"name":"name","outputs":[{"internalType":"string","name":"","type":"string"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"nonces","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"owner","type":"address"},{"internalType":"address","name":"spender","type":"address"},{"internalType":"uint256","name":"value","type":"uint256"},{"internalType":"uint256","name":"deadline","type":"uint256"},{"internalType":"uint8","name":"v","type":"uint8"},{"internalType":"bytes32","name":"r","type":"bytes32"},{"internalType":"bytes32","name":"s","type":"bytes32"}],"name":"permit","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"price0CumulativeLast","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"price1CumulativeLast","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"to","type":"address"}],"name":"skim","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"uint256","name":"amount0Out","type":"uint256"},{"internalType":"uint256","name":"amount1Out","type":"uint256"},{"internalType":"address","name":"to","type":"address"},{"internalType":"bytes","name":"data","type":"bytes"}],"name":"swap","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"symbol","outputs":[{"internalType":"string","name":"","type":"string"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[],"name":"sync","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"token0","outputs":[{"internalType":"address","name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"token1","outputs":[{"internalType":"address","name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"totalSupply","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"value","type":"uint256"}],"name":"transfer","outputs":[{"internalType":"bool","name":"","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"from","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"value","type":"uint256"}],"name":"transferFrom","outputs":[{"internalType":"bool","name":"","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"}]

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Swarm Source

bzzr://8309ae951979e3426b1a1e83083843a8ccc0cd0e8c253bf3a6dfe34ad109488b
Block Transaction Difficulty Gas Used Reward
Block Uncle Number Difficulty Gas Used Reward
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