Contract 0x764DCDaB30d0aF8Fd1F45755e3d905Bc1e2f5792

 

Contract Overview

Balance:
0 MATIC

MATIC Value:
$0.00

Token:
 
Txn Hash Method
Block
From
To
Value [Txn Fee]
0xb29a8cde6bc6867058a73ae3f9e1086119147aaa025689580c5a59e123dd24c4Approve281959962022-05-11 15:50:4354 days 12 hrs ago0x3cef0d05ae5eb9d4c1eb8618aa3c7c63412d8db3 IN  0x764dcdab30d0af8fd1f45755e3d905bc1e2f57920 MATIC0.018564400
0x5fde58eeaacdd796ca9d67851b9024ed9731d594b5c553d30eb0455675c7412bTransfer274652892022-04-23 2:41:3873 days 1 hr ago0xd5aa05d319ad96e832e600561c9e17707f484c4d IN  0x764dcdab30d0af8fd1f45755e3d905bc1e2f57920 MATIC0.001811141224 38.736017286
0x638d4d89df47a6cec409faae5744b378d8020a1176e51c19aa0a7e7d9f196045Approve273634832022-04-20 13:30:2775 days 15 hrs ago0xa83df9e606c62afd983198c2bf3754f24af26c22 IN  0x764dcdab30d0af8fd1f45755e3d905bc1e2f57920 MATIC0.001118892582 42.206434642
0x92817a685cf66cfc3ec0e7adef5e92a53bbe74e2d226540772a4ab3383391008Approve273634252022-04-20 13:28:2775 days 15 hrs ago0xa83df9e606c62afd983198c2bf3754f24af26c22 IN  0x764dcdab30d0af8fd1f45755e3d905bc1e2f57920 MATIC0.002362752464 50.910417238
0xdaa6f7a031cd64761cf01f2bfb56260bf7403e77f82b85ddf709c66938c2a12fApprove272271862022-04-17 1:52:0579 days 2 hrs ago0x1cf044dd8a89babba6166566a2bcd4fa0e693da0 IN  0x764dcdab30d0af8fd1f45755e3d905bc1e2f57920 MATIC0.0014405664 31.04
0x7910934002a865cbeed8cb914cd7618d185b4ffa510d62a8b820022b567efebdApprove271412832022-04-14 21:11:1781 days 7 hrs ago0xab91be9c89eb7c38b52abd60ce3de24ea36a4db0 IN  0x764dcdab30d0af8fd1f45755e3d905bc1e2f57920 MATIC0.001156155291 43.612044189
0x03240d4a6d2d77e5747b33651db3a40635fb14b847abfe674050ed200f808970Approve271412692022-04-14 21:10:4981 days 7 hrs ago0xab91be9c89eb7c38b52abd60ce3de24ea36a4db0 IN  0x764dcdab30d0af8fd1f45755e3d905bc1e2f57920 MATIC0.002065758017 44.511054026
0xb8ff477f65d39bbca5a236a333b53b21b2630c4c9787c31449cd21cd07090363Approve271412432022-04-14 21:09:5381 days 7 hrs ago0xab91be9c89eb7c38b52abd60ce3de24ea36a4db0 IN  0x764dcdab30d0af8fd1f45755e3d905bc1e2f57920 MATIC0.001129082888 43.216829551
0x29cc5a60f7d0e2d63755595748f8ad18fd702a8171498b29be10c06e2fc069dfApprove271411822022-04-14 21:07:4781 days 7 hrs ago0xab91be9c89eb7c38b52abd60ce3de24ea36a4db0 IN  0x764dcdab30d0af8fd1f45755e3d905bc1e2f57920 MATIC0.001766729537 38.335493148
0x36be87f27f2d6e95b204bedafa473e30ff88d17c51a1537f245e0a9ac2aa2a4cApprove271411102022-04-14 21:05:1981 days 7 hrs ago0xab91be9c89eb7c38b52abd60ce3de24ea36a4db0 IN  0x764dcdab30d0af8fd1f45755e3d905bc1e2f57920 MATIC0.001244746162 47.578402342
0x46c1f10c88597dab2cbe30bee296082f60a71aaf487366628d4c73cbd00a09e6Approve271409882022-04-14 21:01:0781 days 7 hrs ago0xab91be9c89eb7c38b52abd60ce3de24ea36a4db0 IN  0x764dcdab30d0af8fd1f45755e3d905bc1e2f57920 MATIC0.001998959756 43.397155054
0xa8e322d3d971d701575b275038d9ca28e2f22e91beb71f526de52e03ad98d8c4Approve271357792022-04-14 17:57:2181 days 10 hrs ago0xab91be9c89eb7c38b52abd60ce3de24ea36a4db0 IN  0x764dcdab30d0af8fd1f45755e3d905bc1e2f57920 MATIC0.001747227456 37.647650425
0xf1436fd2b02536aa463959d55b0ed6ebee39f9ec3b7f15a2cb5aa7bd958ef08eApprove271095722022-04-14 1:57:1182 days 2 hrs ago0xab91be9c89eb7c38b52abd60ce3de24ea36a4db0 IN  0x764dcdab30d0af8fd1f45755e3d905bc1e2f57920 MATIC0.002701062006 58.200000142
0x6bcc3201e0ad1b9f2232c534eb0ff90bfed8941472e22e8b97b9dace3091acbeApprove270247772022-04-11 22:29:0884 days 6 hrs ago0x3cef0d05ae5eb9d4c1eb8618aa3c7c63412d8db3 IN  0x764dcdab30d0af8fd1f45755e3d905bc1e2f57920 MATIC0.002320550
0x5bbae948c330314dc92419ec7c5fe28e1a8b8eee28b71279c837ef4f56a08842Approve270204792022-04-11 19:47:1084 days 8 hrs ago0x17cd4d562139a82fc530b0dfd304160962ebdf21 IN  0x764dcdab30d0af8fd1f45755e3d905bc1e2f57920 MATIC0.00152498394 32.858951521
0x31d951c3d9f945726015acf5e638283b0ac2b43312b4ac83cf8f92a35674be33Approve270069392022-04-11 11:47:1484 days 16 hrs ago0xa83df9e606c62afd983198c2bf3754f24af26c22 IN  0x764dcdab30d0af8fd1f45755e3d905bc1e2f57920 MATIC0.001763683111 38.002221761
0xca9d6d442fef14ba4b90ea1734cb8549b20a059f7fcccec00dc2be7ec40c0e00Approve270043242022-04-11 10:13:0084 days 18 hrs ago0x91ed149e6ebbb634543a64201e43f0a17a0b4f83 IN  0x764dcdab30d0af8fd1f45755e3d905bc1e2f57920 MATIC0.001750949671 37.727853303
0x186b0e1be4efdab2f533320d343d221f09420d3266f060a291c2dfbb0f4e7a2fApprove270009372022-04-11 8:15:0184 days 20 hrs ago0x862606a6012fa68019ee26ce4a3b35bc2684beb4 IN  0x764dcdab30d0af8fd1f45755e3d905bc1e2f57920 MATIC0.001441016577 31.0497
0x8407b989a9c19e29b5141571154a4e98a110f4d6196495940bbce1782dc9ee44Approve269998922022-04-11 7:39:0784 days 20 hrs ago0x3ca7470e96002aeab38e9ab090c128b7536aa2f9 IN  0x764dcdab30d0af8fd1f45755e3d905bc1e2f57920 MATIC0.004641 100
0x4312dc135abe8e4b3aedbf67e0cbc986f303ce9df17c62afda695ab075ce49d8Approve269963412022-04-11 5:33:2584 days 23 hrs ago0xd7189a81961cb3cc0dd6ec6a1f90bc5f95dfd7f0 IN  0x764dcdab30d0af8fd1f45755e3d905bc1e2f57920 MATIC0.00139880498 30.140163334
0xe583c64b1cd22f0495729953634a02d1cb955e6b0ec209a6f7429328de122b20Approve269940962022-04-11 4:09:5185 days 28 mins ago0x94f2d4a5633a75418e115bf82fafda7f64c60f26 IN  0x764dcdab30d0af8fd1f45755e3d905bc1e2f57920 MATIC0.001455872418 31.369800001
0xebd60eea7b4a13bb25af1247e729af7bcfc035b4241b44e4be8951491850047eApprove269936862022-04-11 3:54:2585 days 44 mins ago0x4dea0eb50e61368ef2deb64a4272f0eb77aaa68e IN  0x764dcdab30d0af8fd1f45755e3d905bc1e2f57920 MATIC0.00145285038 31.304683919
0xe88538487fb3565e4cb8f02b60b73b71b3d5fee3b41deba43ddf2de218387678Approve269934632022-04-11 3:45:5785 days 52 mins ago0xfee51fd4b58abdafd28433d6cf70b85463e2945c IN  0x764dcdab30d0af8fd1f45755e3d905bc1e2f57920 MATIC0.0013955487 30.07
0x449cd3ffaef5e18c0813a0dcd9a4022bf8b4ab7be4c3a0b214f0b0c931dadb95Approve269934352022-04-11 3:45:0185 days 53 mins ago0xa9183ecf80748a5731592d0f41106d6486559331 IN  0x764dcdab30d0af8fd1f45755e3d905bc1e2f57920 MATIC0.0014387131
0xf34afdea0fa9e870e938dd9504a3eb518b31a061dccdb7107543037b842936f0Approve269930482022-04-11 3:31:4385 days 1 hr ago0x070fb8e20e35cd2aea531debb1e4d533a5161ab5 IN  0x764dcdab30d0af8fd1f45755e3d905bc1e2f57920 MATIC0.00139559371730.070970002
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0x182ea01b0b3f6695c5abefcf0c8faffff3f98e4cd56f3f7b2fd82df789f0f5e4269179172022-04-09 5:48:4686 days 22 hrs ago 0xe3bd06c7ac7e1ceb17bdd2e5ba83e40d1515af2a  Contract Creation0 MATIC
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Similar Match Source Code
Note: This contract matches the deployed ByteCode of the Source Code for Contract 0x7Cb0703aa37601a02798BDFF63A18aF2dD082572

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 polygonscan.com on 2021-09-03
*/

// 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 Security Audit

Contract ABI

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Swarm Source

bzzr://8309ae951979e3426b1a1e83083843a8ccc0cd0e8c253bf3a6dfe34ad109488b
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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