Contract 0x8f09fff247b8fdb80461e5cf5e82dd1ae2ebd6d7 1

Txn Hash Method
Block
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Value [Txn Fee]
0x6be0899ef787e42c9ca0991161f14056ca94d5ba984fffce494c631552495d6fApprove104101542023-09-27 21:40:337 hrs 44 mins ago0xd65e593dc772bba894e9ce4e70b04d96389d1dc3 IN  0x8f09fff247b8fdb80461e5cf5e82dd1ae2ebd6d70 CRO0.21479233724 4,655.028764262
0x0ceaac0b4cc22273fac7ce7520ed8ad67242e6c4d009854db6f39b5d69c6397aApprove103970522023-09-27 1:09:341 day 4 hrs agoCronos ID Name retrobear.cro IN  0x8f09fff247b8fdb80461e5cf5e82dd1ae2ebd6d70 CRO0.121850777474 4,656.124473626
0xc001292792bde57b2fb656dc2e1190ba95b3a93e43fb43562121d6f1c0a7d78fApprove103784512023-09-25 20:01:512 days 9 hrs ago0xcdbea431cbd8b69777d428aa723074d46022cdfa IN  0x8f09fff247b8fdb80461e5cf5e82dd1ae2ebd6d70 CRO0.2162652755020
0x954d249b3f2c486de5d19c781745ee270466d20e527ba8460ea6857ddb607fa1Approve103630062023-09-24 19:50:223 days 9 hrs ago0xdfc33a42214c149dd0e010d7c5ae69df8825a518 IN  0x8f09fff247b8fdb80461e5cf5e82dd1ae2ebd6d70 CRO0.2162978449330
0xbd336acb89ed03bb05156b96ec77ef0df1bd904e1184d7b7f73aced4622cf6c4Approve103542982023-09-24 6:12:343 days 23 hrs ago0x3764e671894e8b39d5542f7e0c216bd7d911be2a IN  0x8f09fff247b8fdb80461e5cf5e82dd1ae2ebd6d70 CRO0.216385974466 4,658.06979951
0x7ac3d7f370b075e48a6ef425487f1deb371bf4735697740bcb4be1c1296e2774Approve103302772023-09-22 16:35:595 days 12 hrs ago0x9d9a070963478026337adaaa1da7d46c327a7596 IN  0x8f09fff247b8fdb80461e5cf5e82dd1ae2ebd6d70 CRO0.2163671666730
0xeeafbbd858c95c234a6d4aef4970d3292c549f059163eb4f6008f832e5e357e9Approve103271322023-09-22 11:40:345 days 17 hrs ago0x4fdfba6d4d665b923d1e4da02ae20f7dcd8d0c7a IN  0x8f09fff247b8fdb80461e5cf5e82dd1ae2ebd6d70 CRO0.216373838010
0x89c60a6f3de7e825958af3b092050b2408a30f196f8cde599426a6a23a147998Approve103252162023-09-22 8:40:455 days 20 hrs ago0x2233819014b37d12a119a85ce3f90781405fcee0 IN  0x8f09fff247b8fdb80461e5cf5e82dd1ae2ebd6d70 CRO0.2163779197610
0x5c42cef63fa9dbdea8ba919b70a4f15d78ceec19015f58c6de3b997a234c757bApprove103200132023-09-22 0:32:006 days 4 hrs agoCronos ID Name bones.cro IN  0x8f09fff247b8fdb80461e5cf5e82dd1ae2ebd6d70 CRO0.232270
0xc82defe827c47111576da4e19596475ed24930a4c3d2271c189ee1db1e676ef2Approve103164602023-09-21 18:58:076 days 10 hrs agoCronos ID Name aloha.cro IN  0x8f09fff247b8fdb80461e5cf5e82dd1ae2ebd6d70 CRO0.232270
0xf4d1f265ecde1ca7d31e23b712ac97bd06d6c9b2ad050715a87532db5b1e63fdApprove103152802023-09-21 17:07:126 days 12 hrs agoCronos ID Name g3n3c1d3.cro IN  0x8f09fff247b8fdb80461e5cf5e82dd1ae2ebd6d70 CRO0.2163989161280
0x120c15be112ad508d8b6390f70562bbbb019c2de4f14b21d1fa04918fcc10663Approve103140732023-09-21 15:13:446 days 14 hrs ago0xd4359add39134886ef1d124e96d097a7a8bb4dbc IN  0x8f09fff247b8fdb80461e5cf5e82dd1ae2ebd6d70 CRO0.1160160
0xbd7c4655d0dda0bf34a7462f58851f207a6b615f4bf04c34c0b397d244df40afApprove103139742023-09-21 15:04:256 days 14 hrs ago0xd4359add39134886ef1d124e96d097a7a8bb4dbc IN  0x8f09fff247b8fdb80461e5cf5e82dd1ae2ebd6d70 CRO0.1160160
0xf09210ff2f1d058ed8d7131fd8b450931afdcd6e3a43d4ca3ed5949523e94967Approve102591822023-09-18 1:19:5610 days 4 hrs ago0x77ed845fe21f72dab1b01dce681592f4bdca644e IN  0x8f09fff247b8fdb80461e5cf5e82dd1ae2ebd6d70 CRO0.2165172576890
0xd7b1090d378b734e2fb9641d78ad5831c58f9874ac2cbef2d983179d81dfaca7Approve102527062023-09-17 15:10:5710 days 14 hrs ago0xaefda403ac517391113cf76300fdaf1531681039 IN  0x8f09fff247b8fdb80461e5cf5e82dd1ae2ebd6d70 CRO0.1160160
0xfcd9bd2f1f8474a828e92362b5d023b5be028cdaff9d45a092b0a5b08ab0a938Approve102494692023-09-17 10:06:3910 days 19 hrs agoCronos ID Name west.cro IN  0x8f09fff247b8fdb80461e5cf5e82dd1ae2ebd6d70 CRO0.216537646080
0xcd0aed31b447032a06c32e30219701785512262c80bb3e497e81615b65f9683fApprove102474012023-09-17 6:52:1110 days 22 hrs ago0x0dd07735ae7f072870848369197b99afab74a241 IN  0x8f09fff247b8fdb80461e5cf5e82dd1ae2ebd6d70 CRO0.23071 5,000
0xcdcbc87dd72b9ecd97054651d78a38affe9f3c18336923d669e77e30e238b777Approve102103192023-09-14 20:49:0313 days 8 hrs ago0xd4ef72f513e7b3cc3f6c79311cdc2fdec6c8223b IN  0x8f09fff247b8fdb80461e5cf5e82dd1ae2ebd6d70 CRO0.232270
0x4126690a36c8e77c96b1b859fed50514957d05f93c7d23e3ad58162d2844aea5Approve101714182023-09-12 7:54:2415 days 21 hrs ago0xd59498c2cd498c4b09da8d358850b8b73f108174 IN  0x8f09fff247b8fdb80461e5cf5e82dd1ae2ebd6d70 CRO0.215316250978 4,666.383142878
0xdfc966bec34e0b7b4de93021f60367f2dd5d1fb65d438f1284a07071fec6ee48Approve101645882023-09-11 21:13:3916 days 8 hrs ago0xde18435bfff6e26a48ff10623be1f9e6deda3709 IN  0x8f09fff247b8fdb80461e5cf5e82dd1ae2ebd6d70 CRO0.2167169376890
0xf4b80cda04d8fe72d99000cbb0ed6a1a7d6f2a4b9a83e74af310df45e372a8dcApprove101625082023-09-11 17:58:2016 days 11 hrs ago0x8a24746ef0fac1c769c6046ef624665f2621fee7 IN  0x8f09fff247b8fdb80461e5cf5e82dd1ae2ebd6d70 CRO0.112796275212 4,666.788382799
0xf83c7b18cc50b48ffa80f4d04e4100729191573ad6a594a5a80fffbf5cf3d302Approve101533732023-09-11 3:41:2817 days 1 hr ago0x2b2b4126fa61b7efa9aa9bba528ed73de19efd5a IN  0x8f09fff247b8fdb80461e5cf5e82dd1ae2ebd6d70 CRO0.2167405994880
0x49c863abc5b48ca2998c4f7965b7cd552124a9fdf55ce979dbe234ab651460a4Approve101486712023-09-10 20:20:3117 days 9 hrs ago0xcf380eda0ad5a3c599775a839e288a421f3b21d5 IN  0x8f09fff247b8fdb80461e5cf5e82dd1ae2ebd6d70 CRO0.23071 5,000
0xc3913b5e0ecab8d5779df75f60bee5fb4fa0c526f1b8592da1d4a240d32a2b01Approve101486112023-09-10 20:14:5417 days 9 hrs ago0x64fe7f8310db9b6dbabc85b7f63365d9904dfa2a IN  0x8f09fff247b8fdb80461e5cf5e82dd1ae2ebd6d70 CRO0.122107222541 4,665.923673714
0x3521804047db9a66672a10d98d151c2f745b90861c83f631f9eba4495ea37467Approve101485662023-09-10 20:10:3817 days 9 hrs ago0x64fe7f8310db9b6dbabc85b7f63365d9904dfa2a IN  0x8f09fff247b8fdb80461e5cf5e82dd1ae2ebd6d70 CRO0.112775383967 4,665.924036728
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0x6f015736ab7e5c650541fbd579b9a41635d81cc5e1363ff2ba38bb030b8be6ac178252021-11-09 4:26:09688 days 58 mins ago VVS Finance: Factory  Contract Creation0 CRO
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Similar Match Source Code
This contract matches the deployed ByteCode of the Source Code for Contract 0xa111c17f8b8303280d3eb01bbcd61000aa7f39f9
The constructor portion of the code might be different and could alter the actual behaviour of the contract

Contract Name:
VVSPair

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 cronoscan.com on 2022-01-11
*/

// File contracts/interfaces/IVVSPair.sol

pragma solidity >=0.5.0;

interface IVVSPair {
    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 @openzeppelin/contracts/cryptography/[email protected]

pragma solidity ^0.5.0;

/**
 * @dev Elliptic Curve Digital Signature Algorithm (ECDSA) operations.
 *
 * These functions can be used to verify that a message was signed by the holder
 * of the private keys of a given address.
 */
library ECDSA {
    /**
     * @dev Returns the address that signed a hashed message (`hash`) with
     * `signature`. This address can then be used for verification purposes.
     *
     * The `ecrecover` EVM opcode allows for malleable (non-unique) signatures:
     * this function rejects them by requiring the `s` value to be in the lower
     * half order, and the `v` value to be either 27 or 28.
     *
     * NOTE: This call _does not revert_ if the signature is invalid, or
     * if the signer is otherwise unable to be retrieved. In those scenarios,
     * the zero address is returned.
     *
     * IMPORTANT: `hash` _must_ be the result of a hash operation for the
     * verification to be secure: it is possible to craft signatures that
     * recover to arbitrary addresses for non-hashed data. A safe way to ensure
     * this is by receiving a hash of the original message (which may otherwise
     * be too long), and then calling {toEthSignedMessageHash} on it.
     */
    function recover(bytes32 hash, bytes memory signature) internal pure returns (address) {
        // Check the signature length
        if (signature.length != 65) {
            return (address(0));
        }

        // Divide the signature in r, s and v variables
        bytes32 r;
        bytes32 s;
        uint8 v;

        // ecrecover takes the signature parameters, and the only way to get them
        // currently is to use assembly.
        // solhint-disable-next-line no-inline-assembly
        assembly {
            r := mload(add(signature, 0x20))
            s := mload(add(signature, 0x40))
            v := byte(0, mload(add(signature, 0x60)))
        }

        // EIP-2 still allows signature malleability for ecrecover(). Remove this possibility and make the signature
        // unique. Appendix F in the Ethereum Yellow paper (https://ethereum.github.io/yellowpaper/paper.pdf), defines
        // the valid range for s in (281): 0 < s < secp256k1n ÷ 2 + 1, and for v in (282): v ∈ {27, 28}. Most
        // signatures from current libraries generate a unique signature with an s-value in the lower half order.
        //
        // If your library generates malleable signatures, such as s-values in the upper range, calculate a new s-value
        // with 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEBAAEDCE6AF48A03BBFD25E8CD0364141 - s1 and flip v from 27 to 28 or
        // vice versa. If your library also generates signatures with 0/1 for v instead 27/28, add 27 to v to accept
        // these malleable signatures as well.
        if (uint256(s) > 0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF5D576E7357A4501DDFE92F46681B20A0) {
            return address(0);
        }

        if (v != 27 && v != 28) {
            return address(0);
        }

        // If the signature is valid (and not malleable), return the signer address
        return ecrecover(hash, v, r, s);
    }

    /**
     * @dev Returns an Ethereum Signed Message, created from a `hash`. This
     * replicates the behavior of the
     * https://github.com/ethereum/wiki/wiki/JSON-RPC#eth_sign[`eth_sign`]
     * JSON-RPC method.
     *
     * See {recover}.
     */
    function toEthSignedMessageHash(bytes32 hash) internal pure returns (bytes32) {
        // 32 is the length in bytes of hash,
        // enforced by the type signature above
        return keccak256(abi.encodePacked("\x19Ethereum Signed Message:\n32", hash));
    }
}


// File contracts/interfaces/IVVSERC20.sol

pragma solidity >=0.5.0;

interface IVVSERC20 {
    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/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/VVSERC20.sol

pragma solidity =0.5.16;



contract VVSERC20 is IVVSERC20 {
    using SafeMath for uint;
    using ECDSA for bytes32;

    string public constant name = 'VVS Finance LPs';
    string public constant symbol = 'VVS-LP';
    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, 'VVS: EXPIRED');
        bytes32 digest = keccak256(
            abi.encodePacked(
                '\x19\x01',
                DOMAIN_SEPARATOR,
                keccak256(abi.encode(PERMIT_TYPEHASH, owner, spender, value, nonces[owner]++, deadline))
            )
        );
        address recoveredAddress = digest.recover(abi.encodePacked(r, s, v));
        require(recoveredAddress != address(0) && recoveredAddress == owner, 'VVS: INVALID_SIGNATURE');
        _approve(owner, spender, value);
    }
}


// File contracts/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/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/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/interfaces/IVVSFactory.sol

pragma solidity >=0.5.0;

interface IVVSFactory {
    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/interfaces/IVVSCallee.sol

pragma solidity >=0.5.0;

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


// File contracts/VVSPair.sol

pragma solidity =0.5.16;







contract VVSPair is IVVSPair, VVSERC20 {
    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, 'VVS: 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))), 'VVS: 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, 'VVS: 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), 'VVS: 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 1/3th of the growth in sqrt(k)
    function _mintFee(uint112 _reserve0, uint112 _reserve1) private returns (bool feeOn) {
        address feeTo = IVVSFactory(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(2).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, 'VVS: 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, 'VVS: 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, 'VVS: INSUFFICIENT_OUTPUT_AMOUNT');
        (uint112 _reserve0, uint112 _reserve1,) = getReserves(); // gas savings
        require(amount0Out < _reserve0 && amount1Out < _reserve1, 'VVS: 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, 'VVS: 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) IVVSCallee(to).vvsCall(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, 'VVS: 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), 'VVS: K');
        }

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

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

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

Contract ABI

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Swarm Source

bzzr://902c49c309bd4a714b52f692ab6ba8d147213a3ac14c441fdec1c26c9338d0ea
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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