Contract 0x59dcb4eab08fa90ed0d7f596c68a54f0c8ca63f4

Contract Overview

Balance:
0 BNB
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Block
From
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Value [Txn Fee]
0x94ee4f8da3c7d10a25d9eddd623655cd2488bd6e85c77fe2b082c5c52624145eSet Fee To84041112021-04-29 13:22:04147 days 13 hrs ago0xaa50da3bd10d140536dd96136a4781274c09561b IN  0x59dcb4eab08fa90ed0d7f596c68a54f0c8ca63f40 BNB0.00043433
0x24b319fdaf05084934309d5775d893a218c2a94392fb85a19ce3d8972bba274b0x6080604082078402021-04-22 17:48:13154 days 9 hrs ago0xaa50da3bd10d140536dd96136a4781274c09561b IN  Contract Creation0 BNB0.02578099
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Latest 25 internal transaction
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0x1eb7eb48d23bcd894e811f8ee53213f39c71105200ec3faf9b0a2a4f4b4fa1b685742712021-05-05 11:15:59141 days 16 hrs ago 0x60fd8c5a0561a169f842ee06426d45526222cdd9 0x59dcb4eab08fa90ed0d7f596c68a54f0c8ca63f40 BNB
0x4a3644b53a6791822a83a59e3bf348d22e7db1293a41e820d407ad8cfb22c49d85703522021-05-05 8:00:02141 days 19 hrs ago 0x952b054914f5082f76810190f43f0001c822ee79 0x59dcb4eab08fa90ed0d7f596c68a54f0c8ca63f40 BNB
0x7de5b96517e0a61d37ae29384edf7c7a92c34ae734b40357540e211c7edd799b85703352021-05-05 7:59:11141 days 19 hrs ago 0x5084730e3b2c403b8d6bc157abe2cdff151ccf42 0x59dcb4eab08fa90ed0d7f596c68a54f0c8ca63f40 BNB
0x2654e29de032f01ec7a48172bf1005b74a947e1f760f63109f18b811126c27ab85703042021-05-05 7:57:38141 days 19 hrs ago 0x21b91241b2e0584091a5af798c6a3da4a1f15bce 0x59dcb4eab08fa90ed0d7f596c68a54f0c8ca63f40 BNB
0x04d70a372cd191c3b99c7eb6b98d5817beca03d8ea479059ed6d570a747b152c85702892021-05-05 7:56:53141 days 19 hrs ago 0xcf3fd35db0000027af4f17821fae183ec67f3012 0x59dcb4eab08fa90ed0d7f596c68a54f0c8ca63f40 BNB
0xd3969af664d78d790993036eb398aabd23ef0a164e3cf40984bbd02db48be55785702762021-05-05 7:56:14141 days 19 hrs ago 0x57e2d4c79118d7d8f6240823eb1ac2beb2394a41 0x59dcb4eab08fa90ed0d7f596c68a54f0c8ca63f40 BNB
0xbd3a1c33cc369d3f32d1a5dda5083c070ae1d1d6768391367f5a7dbe2156e67385702612021-05-05 7:55:29141 days 19 hrs ago 0xeb1b27c96f672351b6924ca1cfd1b26965bf6973 0x59dcb4eab08fa90ed0d7f596c68a54f0c8ca63f40 BNB
0x8f05e83cae1663bc57e1ebe75257117c22050545bbf705c12327613611a3ad2585702512021-05-05 7:54:59141 days 19 hrs ago 0x60fd8c5a0561a169f842ee06426d45526222cdd9 0x59dcb4eab08fa90ed0d7f596c68a54f0c8ca63f40 BNB
0x7ea9df93b23092d941fd7d3b637dc41e5c6a841088d78fc67b212f234f6bca5285701572021-05-05 7:50:17141 days 19 hrs ago 0xb3cda0a175a8b06ce48028d82d5955ca5e6acd32 0x59dcb4eab08fa90ed0d7f596c68a54f0c8ca63f40 BNB
0x1b8d194069d38acf35c4db0e647e05f4acfca63da3334dcc854fe0bf8717030e85701252021-05-05 7:48:41141 days 19 hrs ago 0x86159fc047d7f3fb6eb42e08883a516a993f66b0 0x59dcb4eab08fa90ed0d7f596c68a54f0c8ca63f40 BNB
0x31930a107b1fda1ae7b7082448fa80a998361effb2bf4d8de3eb1c973803c71e85701102021-05-05 7:47:56141 days 19 hrs ago 0x68d9b85603e3df5df5a32d24e587895d617c1b67 0x59dcb4eab08fa90ed0d7f596c68a54f0c8ca63f40 BNB
0x454ff2e9073a06615ad4e09897d16b038dd766488019fbba74ef4b9b55224b1d85701022021-05-05 7:47:32141 days 19 hrs ago 0x38d606b4b82170cc59e67ef09eccff1f6be9a3ab 0x59dcb4eab08fa90ed0d7f596c68a54f0c8ca63f40 BNB
0x44b90b8adb3475c68fd51e2454cfd7871bfc237820ba29046202ae855e352e2785483152021-05-04 13:38:11142 days 13 hrs ago 0x60fd8c5a0561a169f842ee06426d45526222cdd9 0x59dcb4eab08fa90ed0d7f596c68a54f0c8ca63f40 BNB
0x44b90b8adb3475c68fd51e2454cfd7871bfc237820ba29046202ae855e352e2785483152021-05-04 13:38:11142 days 13 hrs ago 0xe9ee87fb3c4b6e4bf6b40f5a0f9aed5658ba2e4a 0x59dcb4eab08fa90ed0d7f596c68a54f0c8ca63f40 BNB
0xa4c66d75353433bc97e2e295288fead0c7b96c75acd4fdd5db5f6a71f8e856d285479742021-05-04 13:21:08142 days 13 hrs ago 0x60fd8c5a0561a169f842ee06426d45526222cdd9 0x59dcb4eab08fa90ed0d7f596c68a54f0c8ca63f40 BNB
0xa4c66d75353433bc97e2e295288fead0c7b96c75acd4fdd5db5f6a71f8e856d285479742021-05-04 13:21:08142 days 13 hrs ago 0xe9ee87fb3c4b6e4bf6b40f5a0f9aed5658ba2e4a 0x59dcb4eab08fa90ed0d7f596c68a54f0c8ca63f40 BNB
0x98100c55cc805edb584acdc79ddd62d2a27edb2b8428294c4eb70cf37fc8576885478002021-05-04 13:12:26142 days 14 hrs ago 0x60fd8c5a0561a169f842ee06426d45526222cdd9 0x59dcb4eab08fa90ed0d7f596c68a54f0c8ca63f40 BNB
0x98100c55cc805edb584acdc79ddd62d2a27edb2b8428294c4eb70cf37fc8576885478002021-05-04 13:12:26142 days 14 hrs ago 0xe9ee87fb3c4b6e4bf6b40f5a0f9aed5658ba2e4a 0x59dcb4eab08fa90ed0d7f596c68a54f0c8ca63f40 BNB
0x3146ff24869513e10b87eec239dcfc442932eff0ed5456a03fc4f13e981a54a985477252021-05-04 13:08:41142 days 14 hrs ago 0x60fd8c5a0561a169f842ee06426d45526222cdd9 0x59dcb4eab08fa90ed0d7f596c68a54f0c8ca63f40 BNB
0x3146ff24869513e10b87eec239dcfc442932eff0ed5456a03fc4f13e981a54a985477252021-05-04 13:08:41142 days 14 hrs ago 0xe9ee87fb3c4b6e4bf6b40f5a0f9aed5658ba2e4a 0x59dcb4eab08fa90ed0d7f596c68a54f0c8ca63f40 BNB
0xafcbfa27433e1218ea7ffe2dce29c1d7a722459f138a0219b188cf019fc3e46c85477152021-05-04 13:08:11142 days 14 hrs ago 0x60fd8c5a0561a169f842ee06426d45526222cdd9 0x59dcb4eab08fa90ed0d7f596c68a54f0c8ca63f40 BNB
0xafcbfa27433e1218ea7ffe2dce29c1d7a722459f138a0219b188cf019fc3e46c85477152021-05-04 13:08:11142 days 14 hrs ago 0xe9ee87fb3c4b6e4bf6b40f5a0f9aed5658ba2e4a 0x59dcb4eab08fa90ed0d7f596c68a54f0c8ca63f40 BNB
0xa652c30892b6bbd8ecee6904f5302d1e59cc377d99721ea823a240f5846f2f4985464672021-05-04 12:05:47142 days 15 hrs ago 0xa77fb464e67f98a0bf4c96c2e79dbaa6840edfd5 0x59dcb4eab08fa90ed0d7f596c68a54f0c8ca63f40 BNB
0xa652c30892b6bbd8ecee6904f5302d1e59cc377d99721ea823a240f5846f2f4985464672021-05-04 12:05:47142 days 15 hrs ago 0xe9ee87fb3c4b6e4bf6b40f5a0f9aed5658ba2e4a 0x59dcb4eab08fa90ed0d7f596c68a54f0c8ca63f40 BNB
0x38ab5518ea80775ce96bc7f4b49a461ef96ebadfa45bbd27d9f11fea45b07d7085462292021-05-04 11:53:53142 days 15 hrs ago 0x38d606b4b82170cc59e67ef09eccff1f6be9a3ab 0x59dcb4eab08fa90ed0d7f596c68a54f0c8ca63f40 BNB
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Contract Source Code Verified (Exact Match)

Contract Name:
GravisFactory

Compiler Version
v0.5.16+commit.9c3226ce

Optimization Enabled:
Yes with 200 runs

Other Settings:
default evmVersion, MIT license

Contract Source Code (Solidity)

/**
 *Submitted for verification at BscScan.com on 2021-04-22
*/

/**
 *Submitted for verification at BscScan.com on 2021-04-12
 */

pragma solidity =0.5.16;

library SafeMath {
    function add(uint256 x, uint256 y) internal pure returns (uint256 z) {
        require((z = x + y) >= x, 'ds-math-add-overflow');
    }

    function sub(uint256 x, uint256 y) internal pure returns (uint256 z) {
        return sub(x, y, 'ds-math-sub-underflow');
    }

    function sub(
        uint256 x,
        uint256 y,
        string memory errorMessage
    ) internal pure returns (uint256 z) {
        require((z = x - y) <= x, errorMessage);
    }

    function mul(uint256 x, uint256 y) internal pure returns (uint256 z) {
        require(y == 0 || (z = x * y) / y == x, 'ds-math-mul-overflow');
    }

    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        return div(a, b, 'SafeMath: division by zero');
    }

    function div(
        uint256 a,
        uint256 b,
        string memory errorMessage
    ) internal pure returns (uint256) {
        // Solidity only automatically asserts when dividing by 0
        require(b > 0, errorMessage);
        uint256 c = a / b;
        // assert(a == b * c + a % b); // There is no case in which this doesn't hold

        return c;
    }
}

library Math {
    function min(uint256 x, uint256 y) internal pure returns (uint256 z) {
        z = x < y ? x : y;
    }

    // babylonian method (https://en.wikipedia.org/wiki/Methods_of_computing_square_roots#Babylonian_method)
    function sqrt(uint256 y) internal pure returns (uint256 z) {
        if (y > 3) {
            z = y;
            uint256 x = y / 2 + 1;
            while (x < z) {
                z = x;
                x = (y / x + x) / 2;
            }
        } else if (y != 0) {
            z = 1;
        }
    }
}

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);
    }
}

interface IGravisFactory {
    event PairCreated(address indexed token0, address indexed token1, address pair, uint256);

    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(uint256) external view returns (address pair);

    function allPairsLength() external view returns (uint256);

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

    function setFeeTo(address) external;

    function setFeeToSetter(address) external;
}

interface IGravisPair {
    event Approval(address indexed owner, address indexed spender, uint256 value);
    event Transfer(address indexed from, address indexed to, uint256 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 (uint256);

    function balanceOf(address owner) external view returns (uint256);

    function allowance(address owner, address spender) external view returns (uint256);

    function approve(address spender, uint256 value) external returns (bool);

    function transfer(address to, uint256 value) external returns (bool);

    function transferFrom(
        address from,
        address to,
        uint256 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 (uint256);

    function permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external;

    event Mint(address indexed sender, uint256 amount0, uint256 amount1);
    event Burn(address indexed sender, uint256 amount0, uint256 amount1, address indexed to);
    event Swap(
        address indexed sender,
        uint256 amount0In,
        uint256 amount1In,
        uint256 amount0Out,
        uint256 amount1Out,
        address indexed to
    );
    event Sync(uint112 reserve0, uint112 reserve1);

    function MINIMUM_LIQUIDITY() external pure returns (uint256);

    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 (uint256);

    function price1CumulativeLast() external view returns (uint256);

    function kLast() external view returns (uint256);

    function mint(address to) external returns (uint256 liquidity);

    function burn(address to) external returns (uint256 amount0, uint256 amount1);

    function swap(
        uint256 amount0Out,
        uint256 amount1Out,
        address to,
        bytes calldata data
    ) external;

    function skim(address to) external;

    function sync() external;

    function initialize(address, address) external;
}

interface IERC20 {
    event Approval(address indexed owner, address indexed spender, uint256 value);
    event Transfer(address indexed from, address indexed to, uint256 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 (uint256);

    function balanceOf(address owner) external view returns (uint256);

    function allowance(address owner, address spender) external view returns (uint256);

    function approve(address spender, uint256 value) external returns (bool);

    function transfer(address to, uint256 value) external returns (bool);

    function transferFrom(
        address from,
        address to,
        uint256 value
    ) external returns (bool);
}

interface IGravisCallee {
    function gravisCall(
        address sender,
        uint256 amount0,
        uint256 amount1,
        bytes calldata data
    ) external;
}

interface IGravisERC20 {
    event Approval(address indexed owner, address indexed spender, uint256 value);
    event Transfer(address indexed from, address indexed to, uint256 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 (uint256);

    function balanceOf(address owner) external view returns (uint256);

    function allowance(address owner, address spender) external view returns (uint256);

    function approve(address spender, uint256 value) external returns (bool);

    function transfer(address to, uint256 value) external returns (bool);

    function transferFrom(
        address from,
        address to,
        uint256 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 (uint256);

    function permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external;
}

contract GravisERC20 is IGravisERC20 {
    using SafeMath for uint256;

    string public constant name = 'Gravis LPs';
    string public constant symbol = 'Gravis-LP';
    uint8 public constant decimals = 18;
    uint256 public totalSupply;
    mapping(address => uint256) public balanceOf;
    mapping(address => mapping(address => uint256)) 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 => uint256) public nonces;

    event Approval(address indexed owner, address indexed spender, uint256 value);
    event Transfer(address indexed from, address indexed to, uint256 value);

    constructor() public {
        uint256 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, uint256 value) internal {
        totalSupply = totalSupply.add(value);
        balanceOf[to] = balanceOf[to].add(value);
        emit Transfer(address(0), to, value);
    }

    function _burn(address from, uint256 value) internal {
        balanceOf[from] = balanceOf[from].sub(value);
        totalSupply = totalSupply.sub(value);
        emit Transfer(from, address(0), value);
    }

    function _approve(
        address owner,
        address spender,
        uint256 value
    ) private {
        allowance[owner][spender] = value;
        emit Approval(owner, spender, value);
    }

    function _transfer(
        address from,
        address to,
        uint256 value
    ) private {
        balanceOf[from] = balanceOf[from].sub(value);
        balanceOf[to] = balanceOf[to].add(value);
        emit Transfer(from, to, value);
    }

    function approve(address spender, uint256 value) external returns (bool) {
        _approve(msg.sender, spender, value);
        return true;
    }

    function transfer(address to, uint256 value) external returns (bool) {
        _transfer(msg.sender, to, value);
        return true;
    }

    function transferFrom(
        address from,
        address to,
        uint256 value
    ) external returns (bool) {
        if (allowance[from][msg.sender] != uint256(-1)) {
            allowance[from][msg.sender] = allowance[from][msg.sender].sub(value);
        }
        _transfer(from, to, value);
        return true;
    }

    function permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external {
        require(deadline >= block.timestamp, 'Gravis: 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, 'Gravis: INVALID_SIGNATURE');
        _approve(owner, spender, value);
    }
}

contract GravisPair is IGravisPair, GravisERC20 {
    using SafeMath for uint256;
    using UQ112x112 for uint224;

    uint256 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

    uint256 public price0CumulativeLast;
    uint256 public price1CumulativeLast;
    uint256 public kLast; // reserve0 * reserve1, as of immediately after the most recent liquidity event

    uint256 private unlocked = 1;
    modifier lock() {
        require(unlocked == 1, 'Gravis: 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,
        uint256 value
    ) private {
        (bool success, bytes memory data) = token.call(abi.encodeWithSelector(SELECTOR, to, value));
        require(success && (data.length == 0 || abi.decode(data, (bool))), 'Gravis: TRANSFER_FAILED');
    }

    event Mint(address indexed sender, uint256 amount0, uint256 amount1);
    event MintFee(address indexed recipient, uint256 amountLP);
    event Burn(address indexed sender, uint256 amount0, uint256 amount1, address indexed to);
    event Swap(
        address indexed sender,
        uint256 amount0In,
        uint256 amount1In,
        uint256 amount0Out,
        uint256 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, 'Gravis: FORBIDDEN'); // sufficient check
        token0 = _token0;
        token1 = _token1;
    }

    // update reserves and, on the first call per block, price accumulators
    function _update(
        uint256 balance0,
        uint256 balance1,
        uint112 _reserve0,
        uint112 _reserve1
    ) private {
        require(balance0 <= uint112(-1) && balance1 <= uint112(-1), 'Gravis: 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 += uint256(UQ112x112.encode(_reserve1).uqdiv(_reserve0)) * timeElapsed;
            price1CumulativeLast += uint256(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 = IGravisFactory(factory).feeTo();
        feeOn = feeTo != address(0);
        uint256 _kLast = kLast; // gas savings
        if (feeOn) {
            if (_kLast != 0) {
                uint256 rootK = Math.sqrt(uint256(_reserve0).mul(_reserve1));
                uint256 rootKLast = Math.sqrt(_kLast);
                if (rootK > rootKLast) {
                    uint256 numerator = totalSupply.mul(rootK.sub(rootKLast));
                    uint256 denominator = rootK.mul(5).add(rootKLast);
                    uint256 liquidity = numerator / denominator;
                    if (liquidity > 0) {
                        _mint(address(this), liquidity);
                        emit MintFee(feeTo, liquidity);
                        _internalBurn(feeTo, false, 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 (uint256 liquidity) {
        (uint112 _reserve0, uint112 _reserve1, ) = getReserves(); // gas savings
        bool feeOn = _mintFee(_reserve0, _reserve1);
        uint256 balance0 = IERC20(token0).balanceOf(address(this));
        uint256 balance1 = IERC20(token1).balanceOf(address(this));
        uint256 amount0 = balance0.sub(_reserve0);
        uint256 amount1 = balance1.sub(_reserve1);
        uint256 _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, 'Gravis: INSUFFICIENT_LIQUIDITY_MINTED');
        _mint(to, liquidity);

        _update(balance0, balance1, _reserve0, _reserve1);
        if (feeOn) kLast = uint256(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 (uint256 amount0, uint256 amount1) {
        return _internalBurn(to, true, 0);
    }

    // this low-level function should be called from a contract which performs important safety checks
    function swap(
        uint256 amount0Out,
        uint256 amount1Out,
        address to,
        bytes calldata data
    ) external lock {
        require(amount0Out > 0 || amount1Out > 0, 'Gravis: INSUFFICIENT_OUTPUT_AMOUNT');
        (uint112 _reserve0, uint112 _reserve1, ) = getReserves(); // gas savings
        require(amount0Out < _reserve0 && amount1Out < _reserve1, 'Gravis: INSUFFICIENT_LIQUIDITY');

        uint256 balance0;
        uint256 balance1;
        {
            // scope for _token{0,1}, avoids stack too deep errors
            address _token0 = token0;
            address _token1 = token1;
            require(to != _token0 && to != _token1, 'Gravis: 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) IGravisCallee(to).gravisCall(msg.sender, amount0Out, amount1Out, data);
            balance0 = IERC20(_token0).balanceOf(address(this));
            balance1 = IERC20(_token1).balanceOf(address(this));
        }
        uint256 amount0In = balance0 > _reserve0 - amount0Out ? balance0 - (_reserve0 - amount0Out) : 0;
        uint256 amount1In = balance1 > _reserve1 - amount1Out ? balance1 - (_reserve1 - amount1Out) : 0;
        require(amount0In > 0 || amount1In > 0, 'Gravis: INSUFFICIENT_INPUT_AMOUNT');
        {
            // scope for reserve{0,1}Adjusted, avoids stack too deep errors
            uint256 balance0Adjusted = balance0.mul(10000).sub(amount0In.mul(25)); // 0,25 % to LP
            uint256 balance1Adjusted = balance1.mul(10000).sub(amount1In.mul(25)); // 0,25 % to LP
            require(
                balance0Adjusted.mul(balance1Adjusted) >= uint256(_reserve0).mul(_reserve1).mul(10000**2),
                'Gravis: 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);
    }

    function _internalBurn(
        address to,
        bool _withMintFee,
        uint256 _toBurn
    ) internal returns (uint256 amount0, uint256 amount1) {
        (uint112 _reserve0, uint112 _reserve1, ) = getReserves(); // gas savings
        address _token0 = token0; // gas savings
        address _token1 = token1; // gas savings
        uint256 liquidity;
        bool feeOn;
        if (_withMintFee) {
            feeOn = _mintFee(_reserve0, _reserve1);
            (_reserve0, _reserve1, ) = getReserves();
            liquidity = balanceOf[address(this)];
        }
        if (_toBurn > 0 && _withMintFee == false) {
            feeOn = true;
            liquidity = _toBurn;
        }
        uint256 _totalSupply = totalSupply; // gas savings, must be defined here since totalSupply can update in _mintFee
        uint256 balance0 = IERC20(_token0).balanceOf(address(this));
        uint256 balance1 = IERC20(_token1).balanceOf(address(this));
        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, 'Gravis: INSUFFICIENT_LIQUIDITY_BURNED');
        _burn(address(this), liquidity);

        require(IERC20(_token0).balanceOf(address(this)) >= amount0, 'amount0');
        require(IERC20(_token1).balanceOf(address(this)) >= amount1, 'amount1');

        _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 = uint256(reserve0).mul(reserve1); // reserve0 and reserve1 are up-to-date
        emit Burn(msg.sender, amount0, amount1, to);
    }
}

contract GravisFactory is IGravisFactory {
    bytes32 public constant INIT_CODE_PAIR_HASH = keccak256(abi.encodePacked(type(GravisPair).creationCode));

    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, uint256);

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

    function allPairsLength() external view returns (uint256) {
        return allPairs.length;
    }

    function createPair(address tokenA, address tokenB) external returns (address pair) {
        require(tokenA != tokenB, 'Gravis: IDENTICAL_ADDRESSES');
        (address token0, address token1) = tokenA < tokenB ? (tokenA, tokenB) : (tokenB, tokenA);
        require(token0 != address(0), 'Gravis: ZERO_ADDRESS');
        require(getPair[token0][token1] == address(0), 'Gravis: PAIR_EXISTS'); // single check is sufficient
        bytes memory bytecode = type(GravisPair).creationCode;
        bytes32 salt = keccak256(abi.encodePacked(token0, token1));
        assembly {
            pair := create2(0, add(bytecode, 32), mload(bytecode), salt)
        }
        IGravisPair(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, 'Gravis: FORBIDDEN');
        feeTo = _feeTo;
    }

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

Contract ABI

[{"inputs":[{"internalType":"address","name":"_feeToSetter","type":"address"}],"payable":false,"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"token0","type":"address"},{"indexed":true,"internalType":"address","name":"token1","type":"address"},{"indexed":false,"internalType":"address","name":"pair","type":"address"},{"indexed":false,"internalType":"uint256","name":"","type":"uint256"}],"name":"PairCreated","type":"event"},{"constant":true,"inputs":[],"name":"INIT_CODE_PAIR_HASH","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"internalType":"uint256","name":"","type":"uint256"}],"name":"allPairs","outputs":[{"internalType":"address","name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"allPairsLength","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"tokenA","type":"address"},{"internalType":"address","name":"tokenB","type":"address"}],"name":"createPair","outputs":[{"internalType":"address","name":"pair","type":"address"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"feeTo","outputs":[{"internalType":"address","name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"feeToSetter","outputs":[{"internalType":"address","name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"internalType":"address","name":"","type":"address"},{"internalType":"address","name":"","type":"address"}],"name":"getPair","outputs":[{"internalType":"address","name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"_feeTo","type":"address"}],"name":"setFeeTo","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"_feeToSetter","type":"address"}],"name":"setFeeToSetter","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"}]

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Constructor Arguments (ABI-Encoded and is the last bytes of the Contract Creation Code above)

000000000000000000000000aa50da3bd10d140536dd96136a4781274c09561b

-----Decoded View---------------
Arg [0] : _feeToSetter (address): 0xaa50da3bd10d140536dd96136a4781274c09561b

-----Encoded View---------------
1 Constructor Arguments found :
Arg [0] : 000000000000000000000000aa50da3bd10d140536dd96136a4781274c09561b


Deployed ByteCode Sourcemap

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Swarm Source

bzzr://3ac21a700d8fd68315a4a66ffba1e8fa24b7504b30d67af978b696090f6cde35
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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