Contract 0x060981d5c74519C1982Ef912374758087fC9137e

Contract Overview

Balance:
0 AVAX

AVAX Value:
$0.00

Token:
Txn Hash Method
Block
From
To
Value [Txn Fee]
0x3b507d833457da002ef2b50e89f5b386dccdaf255cea0a4fb6241118469e9194Approve150824842022-05-23 18:17:47493 days 19 hrs ago0xd28731f314357b40b1ae1e12e5cdef6bd33fe63f IN  0x060981d5c74519c1982ef912374758087fc9137e0 AVAX0.00072315 25
0xfc1e3e3a43e7cdf77b1108031d6adaae66b19f226b758af8e5d3a36c72de02e7Approve140953532022-04-30 13:54:21517 days 22 mins ago0xfe5b98dd559dc4b9ffe3c6e96331f4bd2eb65daf IN  0x060981d5c74519c1982ef912374758087fc9137e0 AVAX0.002909499579 62.691221284
0x1ff7d5b46ba830b5b04c44f70ed5a52b90c502eddb6565d0ba972bb697aa1a49Approve140896962022-04-30 10:39:38517 days 3 hrs ago0x8477b7b6956877fef1fc77007cff538607d4af68 IN  0x060981d5c74519c1982ef912374758087fc9137e0 AVAX0.00235295119850.699228574
0x8e250bca94630704485889e3a2c3c231903f03e3b753dfdf1a78b4e8ff7b275eApprove140559512022-04-29 15:22:42517 days 22 hrs ago0xfcd2f96fbfde291f2fd194b44935c04d909d489b IN  0x060981d5c74519c1982ef912374758087fc9137e0 AVAX0.002049905805 44.169485152
0x085831e331d12053a7f4d9fee32413935db30842654e4a88e8be4f4e69a99be7Approve140557632022-04-29 15:16:12517 days 23 hrs ago0xf6044be779efe6c17fa1308d9f7c881ffc67f62e IN  0x060981d5c74519c1982ef912374758087fc9137e0 AVAX0.002653220376 57.169152697
0x439feda03cd199ded0ff439ccc1dbb356d9ac516b7c745a27cb71c91442f0e59Approve140546742022-04-29 14:38:26517 days 23 hrs ago0xdb50dd536115230d8ffe4ce53ac4d6251cd9fc08 IN  0x060981d5c74519c1982ef912374758087fc9137e0 AVAX0.00313243318 67.494789497
0xc996ee4e451b2eac6c1e06db27464abf17c5c9dcc1df6d9897d8a1db468141f5Approve140540012022-04-29 14:15:14518 days 1 min ago0x4dea0eb50e61368ef2deb64a4272f0eb77aaa68e IN  0x060981d5c74519c1982ef912374758087fc9137e0 AVAX0.002432244498 52.407767689
0x942838d92520851739ccea21066517d58f9a5ac92cda67aa6203edacb9545e69Approve140517622022-04-29 12:57:49518 days 1 hr ago0x328a45d0ef3f939ba580270e1b4138764ce28d62 IN  0x060981d5c74519c1982ef912374758087fc9137e0 AVAX0.002118857368 45.655190019
0x0c0ec3281e5314c01bb04dacb57ed47f789877ccf0b4ad0779e7b805ba2c44e2Approve140466792022-04-29 10:01:33518 days 4 hrs ago0x7547f6c452f8964835339a685dbb5935aac7ffc7 IN  0x060981d5c74519c1982ef912374758087fc9137e0 AVAX0.001629202583 35.104559012
0x4883464725e6d92aa51c4054fcd9621f6fe5150263acd462220e9b7bd80e546eApprove140460272022-04-29 9:39:07518 days 4 hrs ago0x32236ab111e59b28b9369df510541cbc5723ceed IN  0x060981d5c74519c1982ef912374758087fc9137e0 AVAX0.001611354105 34.719976427
0xe7ac0e365dae3cae392e1363792eebe2ec82651a327bd2425fe027b60e618f31Approve140442242022-04-29 8:36:34518 days 5 hrs ago0xa469e74f4cb5da52040af68a617bbc15bae6d479 IN  0x060981d5c74519c1982ef912374758087fc9137e0 AVAX0.001639957942 35.336305581
0x2afbaa6a25b5ef1f6c68f99c05b08744a066cdc484715c7db5b75ccab79c7c23Approve140384432022-04-29 5:17:00518 days 8 hrs ago0x099fc7f1a9bb5ce6e15ba5905975949abf7fa75c IN  0x060981d5c74519c1982ef912374758087fc9137e0 AVAX0.001337143719 28.811543196
0x9e1604f8454a5f18ba7ac0917e789c3583f67377292f9929ddea42b0bec31550Approve140320852022-04-29 1:37:16518 days 12 hrs ago0x23b158db89f8721b047b33b5af7e5c539f144518 IN  0x060981d5c74519c1982ef912374758087fc9137e0 AVAX0.001706422063 36.768413358
0x0f1dec1b895fc56b3632bcd465a6c2c3bca7b88f669cf616bea5767e2682c976Approve140318792022-04-29 1:30:12518 days 12 hrs ago0x7ab1186d0fa3b780851a92e791728f5bc0644b7f IN  0x060981d5c74519c1982ef912374758087fc9137e0 AVAX0.001298125635 27.970817407
0xe46bace6a83b9dea70e341cc9ad563175f05a2424d3fb16cd76b2bd25e9fd65eApprove140290342022-04-28 23:52:57518 days 14 hrs ago0xca64d9e72ec188811af49d7f96ce53825e32dabc IN  0x060981d5c74519c1982ef912374758087fc9137e0 AVAX0.00123174858 26.540585659
0x4e16b40242de0747d6d85d357f2bd074f0b167e369f7a4e18e2a5c4c0abf970aApprove140283432022-04-28 23:29:15518 days 14 hrs ago0x1f95e38f346026328bd6c07d3ccb35b3879a7706 IN  0x060981d5c74519c1982ef912374758087fc9137e0 AVAX0.001230091965 26.504890435
0x051872cb50a5a7ce179d849c6ae4f9af8484a2de4816b728189d4e916d1b32c0Approve140254282022-04-28 21:48:31518 days 16 hrs ago0x5ce2f3f3d59f101ecdd72c156a768aafa253afd8 IN  0x060981d5c74519c1982ef912374758087fc9137e0 AVAX0.002406151645 51.845542898
0x1e0a3a9799ef6b11f0a73b636b1593fe44427852e7e279925aa89681d9994098Approve140251852022-04-28 21:40:11518 days 16 hrs ago0x3f4c541450a12d0d37ca6ddca9c6c057a80aef82 IN  0x060981d5c74519c1982ef912374758087fc9137e0 AVAX0.002783380672 59.973727052
0x6efc8f0e4092704be3a9b5d2fdb5a89672b3ab38bd5fcc5ef5019589d8f74e64Approve140240662022-04-28 21:01:14518 days 17 hrs ago0xfd47a0638e78e505b76f7c863e88f1cfe19167fc IN  0x060981d5c74519c1982ef912374758087fc9137e0 AVAX0.001923246476 41.4403464
0x5129899209224c3ffa4635e18be527fc7026836aecb34906465334a3e154e7a1Approve140234742022-04-28 20:40:50518 days 17 hrs ago0x39b185fcf2b7eff74cfd2a48be043f5b55c44bdc IN  0x060981d5c74519c1982ef912374758087fc9137e0 AVAX0.002027129772 43.678728132
0xfb0fece70fdd1424946c1096c1df4eae267abf0d846b6917a9ddd024a0f686b3Approve140229152022-04-28 20:21:29518 days 17 hrs ago0x8f7dbfcd138bf1e8e1e86f84158f868973a7ae97 IN  0x060981d5c74519c1982ef912374758087fc9137e0 AVAX0.002128542717 45.863880998
0x876983de2938daf9e11f3d8dde8b2bc7950665f584b88532e7f72c747ad88e86Approve140225572022-04-28 20:09:03518 days 18 hrs ago0x4d7f480675937862483ade94419ffc2bd1730034 IN  0x060981d5c74519c1982ef912374758087fc9137e0 AVAX0.00176986523 38.135428371
0x9ddd3731c5a05eb8623a22a16e08dd58ce35e68128f6a5aac139564ba98ec619Approve140221462022-04-28 19:54:49518 days 18 hrs ago0xd2ecd6c235c4c30d2c669c8eff4186cd1f6f8832 IN  0x060981d5c74519c1982ef912374758087fc9137e0 AVAX0.001626344359 35.042972618
0x6c1c9d3d887be9bca85e18775f2b2676ef551d7cffb638cc8d1aee3468db07faApprove140220542022-04-28 19:51:43518 days 18 hrs ago0x0105c26c5d013bb32223dbb2a4bbd98e9b0c320a IN  0x060981d5c74519c1982ef912374758087fc9137e0 AVAX0.001670124183 35.986300012
0xeef21e19cc1529b09791ae72933a1b4aefc346431dfec39b495e10a5e1ee9bf7Approve140219942022-04-28 19:49:43518 days 18 hrs ago0xac68dd30b5f56abf93d3d8d4328d25bd148670a0 IN  0x060981d5c74519c1982ef912374758087fc9137e0 AVAX0.001635426624 35.23866891
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0x676bb3571a596c7136bdbaa1eea51a76112264b730d3fc6ed7c2cd02031e5b72131821782022-04-09 5:41:25538 days 8 hrs ago 0x091d35d7f63487909c863001ddca481c6de47091  Contract Creation0 AVAX
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Similar Match Source Code
This contract matches the deployed ByteCode of the Source Code for Contract 0x2612dA8fc26Efbca3cC3F8fD543BCBa72b10aB59
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 snowtrace.io on 2021-11-16
*/

// 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);
    }
}


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

pragma solidity =0.5.16;


contract ElkFactory is IElkFactory {
    address public feeTo;
    address public feeToSetter;

    mapping(address => mapping(address => address)) public getPair;
    address[] public allPairs;

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

    constructor(address _feeToSetter) public {
        feeToSetter = _feeToSetter;
    }

    function allPairsLength() external view returns (uint) {
        return allPairs.length;
    }

    function createPair(address tokenA, address tokenB) external returns (address pair) {
        require(tokenA != tokenB, 'Elk: IDENTICAL_ADDRESSES');
        (address token0, address token1) = tokenA < tokenB ? (tokenA, tokenB) : (tokenB, tokenA);
        require(token0 != address(0), 'Elk: ZERO_ADDRESS');
        require(getPair[token0][token1] == address(0), 'Elk: PAIR_EXISTS'); // single check is sufficient
        bytes memory bytecode = type(ElkPair).creationCode;
        bytes32 salt = keccak256(abi.encodePacked(token0, token1));
        assembly {
            pair := create2(0, add(bytecode, 32), mload(bytecode), salt)
        }
        IElkPair(pair).initialize(token0, token1);
        getPair[token0][token1] = pair;
        getPair[token1][token0] = pair; // populate mapping in the reverse direction
        allPairs.push(pair);
        emit PairCreated(token0, token1, pair, allPairs.length);
    }

    function setFeeTo(address _feeTo) external {
        require(msg.sender == feeToSetter, 'Elk: FORBIDDEN');
        feeTo = _feeTo;
    }

    function setFeeToSetter(address _feeToSetter) external {
        require(msg.sender == feeToSetter, 'Elk: FORBIDDEN');
        feeToSetter = _feeToSetter;
    }
}

Contract ABI

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Swarm Source

bzzr://c7b8221695f6e1afec12c1d28217e23f2d542d8cf1385ea326b3d79004ea1007
Block Transaction Gas Used Reward
Age Block Fee Address BC Fee Address Voting Power Jailed Incoming
Block Uncle Number Difficulty Gas Used Reward
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