Contract 0x024b440d5eea2d95f90425186e9c6d83e0ea67ef

Txn Hash Method
Block
From
To
Value [Txn Fee]
0xfc84530fc510d0f4aa337d1279b1b263797b20e7c9d4526ec7dc610441bd1fb6Approve67071252021-11-09 3:16:0720 days 18 hrs ago0x442eeed4c81add9f5343d0335d0e592a9d5e39c8 IN  0x024b440d5eea2d95f90425186e9c6d83e0ea67ef0 AVAX0.0011602525
0x2d5792a56d4c7a60c03d2dc678a7e9e8e7ae3fda4e2dce8b8ffdbdd661d523feApprove66339402021-11-07 9:41:0022 days 11 hrs ago0xe1500f14598d27da31cddfd0ffb124b0f904bd2c IN  0x024b440d5eea2d95f90425186e9c6d83e0ea67ef0 AVAX0.0011602525
0x8dd9010427ea856224d007c91a48e7ce8ebfd51f45d5805e7131382293910a4dApprove61638582021-10-27 7:35:1833 days 13 hrs ago0xe1500f14598d27da31cddfd0ffb124b0f904bd2c IN  0x024b440d5eea2d95f90425186e9c6d83e0ea67ef0 AVAX0.0011602525
0x27649158296661eda9b425802c19fc2fc247e3534d98ce827c25ef6758c3c942Approve60597862021-10-24 21:02:5036 days 16 mins ago0x0b96a4b01f3bc3566f6f88e788813c56024662d8 IN  0x024b440d5eea2d95f90425186e9c6d83e0ea67ef0 AVAX0.0011602525
0x640827643749deb1c3dd899f3c56737c5d3bc5283a35a00073d159436ccc60cbApprove60400492021-10-24 9:58:4036 days 11 hrs ago0x43b4380c768a0794964b8412b543f6f5b08fe6f1 IN  0x024b440d5eea2d95f90425186e9c6d83e0ea67ef0 AVAX0.0011602525
0x7eb6cfb7e3f407e41cd2aff29f0946e30318c75fd0be0767cd75ed7c7ec9d4a4Approve60184122021-10-23 21:46:4236 days 23 hrs ago0x53dc3803b1cb7eca40266cc85c7d323d9f91f3ef IN  0x024b440d5eea2d95f90425186e9c6d83e0ea67ef0 AVAX0.0011602525
0x3e53f218432f9d4f29206af431bcd13bab688bcf1cbf53ca043c5cfe3fc550e9Approve58248392021-10-19 8:13:5141 days 13 hrs ago0x53dc3803b1cb7eca40266cc85c7d323d9f91f3ef IN  0x024b440d5eea2d95f90425186e9c6d83e0ea67ef0 AVAX0.0006627525
0x5b87d8ffebfd7fc6c69dc0638d866d792ed682101c0f1cfe8ac437622a5f9418Approve58247902021-10-19 8:12:0341 days 13 hrs ago0x53dc3803b1cb7eca40266cc85c7d323d9f91f3ef IN  0x024b440d5eea2d95f90425186e9c6d83e0ea67ef0 AVAX0.0011602525
0xeb09fdbc6ba5d92814c63a0379f6186643f008b383ec02c14c5faadc02b5479bApprove57592192021-10-17 18:09:2943 days 3 hrs ago0x9a8cad06c6d7851b12b788eb08040a154fa6e758 IN  0x024b440d5eea2d95f90425186e9c6d83e0ea67ef0 AVAX0.00116025 25
0x5e186fc6abb9467d0fc4b3061c91e2c246d770b015215d6f594959a799400767Approve55881302021-10-13 15:10:2047 days 6 hrs ago0xd28731f314357b40b1ae1e12e5cdef6bd33fe63f IN  0x024b440d5eea2d95f90425186e9c6d83e0ea67ef0 AVAX0.00116025 25
0x0a809a4b859ba23f66e46c1d4bebe8525d0b77e1d2cc350f30255f1bb5ce9ffcApprove54126742021-10-09 11:07:2951 days 10 hrs ago0xd2781fb956556720c355520022086c3c704deee8 IN  0x024b440d5eea2d95f90425186e9c6d83e0ea67ef0 AVAX0.0011602525
0x7323b45ee7c1a698f95c9648efe27eb932f1c88ca284743c0a1f88635b53dd1eApprove53128572021-10-07 2:43:5753 days 18 hrs ago0x86b79546589ef374d906c1a7c89c9629101d27c3 IN  0x024b440d5eea2d95f90425186e9c6d83e0ea67ef0 AVAX0.00116025 25
0x6e5564c7d85cb44c2f9f19572ceac0c38266e83e9a8c7cad15a004932a4ab8f3Approve49601962021-09-28 17:18:3862 days 4 hrs ago0x4569c4f05d70eb110c93ee8840925754a8978c78 IN  0x024b440d5eea2d95f90425186e9c6d83e0ea67ef0 AVAX0.00116025 25
0x824eb09bf732529f9bac9e958b5c52ff5c41c935ee851d772e5f430406f3a1cbApprove48626492021-09-26 9:08:0264 days 12 hrs ago0x89b230a6d1ccac3dc3280b419d4b00c68d358639 IN  0x024b440d5eea2d95f90425186e9c6d83e0ea67ef0 AVAX0.0011602525
0x427fa6344414d95d38fe3caf6506c64838be81738e457d7c548dff3cfb02489eApprove45521352021-09-19 10:15:0271 days 11 hrs ago0x778e1b702835db924a2a5487789068650abb89cc IN  0x024b440d5eea2d95f90425186e9c6d83e0ea67ef0 AVAX0.00368434538 79.386886018
0xf98fb0755571bb323fdbdf3dd28dc543626054c812ecdbcea5a658c8b6b17f36Approve45003172021-09-18 6:46:5572 days 14 hrs ago0xd2ecd6c235c4c30d2c669c8eff4186cd1f6f8832 IN  0x024b440d5eea2d95f90425186e9c6d83e0ea67ef0 AVAX0.00394485 85
0x4b8f917d5edd4c1a2fe95499dd57012496d6ab0083450536267bb9e0eb960026Approve43964282021-09-16 2:25:2674 days 18 hrs ago0xb993c549fe14062f3522541f9a6823f55737fb0b IN  0x024b440d5eea2d95f90425186e9c6d83e0ea67ef0 AVAX0.00225335 85
0x03a67f355890a359b1eb3b8377ae02da789f0544e3dfbc2c39810abc908eb4dcApprove43963772021-09-16 2:23:3774 days 18 hrs ago0xb993c549fe14062f3522541f9a6823f55737fb0b IN  0x024b440d5eea2d95f90425186e9c6d83e0ea67ef0 AVAX0.00394485 85
0xa6846eccaf172ab8a386bcaa172639e827e321157c9dbf8cfcfccf20b4102875Approve42197502021-09-12 12:03:4378 days 9 hrs ago0xe1500f14598d27da31cddfd0ffb124b0f904bd2c IN  0x024b440d5eea2d95f90425186e9c6d83e0ea67ef0 AVAX0.004995966618107.64849425
0xb1b6fb07d845033f5d8ccae5769c6df98943a613453385f23119ac6da74f119aApprove41981752021-09-12 2:56:2478 days 18 hrs ago0xdea591345c15ce24abe0ac9ceb47ef618650b9da IN  0x024b440d5eea2d95f90425186e9c6d83e0ea67ef0 AVAX0.0039370271384.83144
0xe1ca2850b2ad467ec95bb2cc3f17fd60b7fe0fbf7f29b2656e8b5552215c9186Approve38587132021-09-04 22:28:3585 days 22 hrs ago0x42f228b9c4943e3ebcb016202167f684a3c71e57 IN  0x024b440d5eea2d95f90425186e9c6d83e0ea67ef0 AVAX0.003726488642 80.29495029
0x3796992408042f550faa7bdeac7876d677d10d0c0c60f2ea880fdf72f1552f2aApprove36787852021-08-31 18:58:3090 days 2 hrs ago0x7547f6c452f8964835339a685dbb5935aac7ffc7 IN  0x024b440d5eea2d95f90425186e9c6d83e0ea67ef0 AVAX0.00225335 85
0x4d15fcf9f729789e5cfc17294fcd2383c1a4bd46f325980579032f3db2e2c854Approve36787612021-08-31 18:57:4590 days 2 hrs ago0x7547f6c452f8964835339a685dbb5935aac7ffc7 IN  0x024b440d5eea2d95f90425186e9c6d83e0ea67ef0 AVAX0.00394485 85
0x605879a735a363fedbc3697d2aceee92cffc05bbf47bafc230d292d00739b7e0Approve33765852021-08-25 20:25:2096 days 54 mins ago0x91111ef021d8f9ee00c503235872334506d125d3 IN  0x024b440d5eea2d95f90425186e9c6d83e0ea67ef0 AVAX0.005459060124 117.626807243
0x9d99126c509fcb1ce9cea76809b88a7b154daf9a5f1c4a0d043e14ef199a551dApprove30685612021-08-19 6:08:11102 days 15 hrs ago0x4b024b1609e1c3c8335a7396748e9339c671dfa6 IN  0x024b440d5eea2d95f90425186e9c6d83e0ea67ef0 AVAX0.01044225
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0xa185d18f26eca1860240310e124912739b2a7d19f629d1ebd95d48a169742d8827825982021-07-27 1:22:34125 days 19 hrs ago 0x091d35d7f63487909c863001ddca481c6de47091  Contract Creation0 AVAX
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Similar_Match_Source_Code
Note: This contract matches the deployed ByteCode of the Source Code for Contract 0x2612dA8fc26Efbca3cC3F8fD543BCBa72b10aB59

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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