Contract 0x814920d1b8007207db6cb5a2dd92bf0b082bdba1 7

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0xa35de0a6da6ca71307566d0d6da77e022cf901c4c24847a93d961ea8bdd34d48Approve136354412024-04-24 21:07:541 hr 7 mins ago0x76090be5481ede11665e0c945a30b08d57888c24 IN  0x814920d1b8007207db6cb5a2dd92bf0b082bdba10 CRO0.23459270
0x9a720d0c34efd1b99862d3097ebd61a1cc2d0382259e2c9b5a76aca002940d56Approve136224232024-04-24 0:34:4121 hrs 40 mins ago0x5b90524b361e3c4a0a8939e618c90318f30c764c IN  0x814920d1b8007207db6cb5a2dd92bf0b082bdba10 CRO0.1506440
0x312b0735f6e0694386ce23f83f844f15e07e3c197d67348241946353bed4b3afApprove136069082024-04-23 0:08:551 day 22 hrs ago0xb6f2954ed5f770e3cc074dcf011a128bc348625d IN  0x814920d1b8007207db6cb5a2dd92bf0b082bdba10 CRO0.2345927 5,050
0xec004afb2e359a94233265e55b5595f2aef81d46f4a227b0da931dcec02eed46Approve136030422024-04-22 18:01:482 days 4 hrs ago0xaf95ccb704fb18d1a4f8c6113513b09932fae611 IN  0x814920d1b8007207db6cb5a2dd92bf0b082bdba10 CRO0.23459270
0x0410bca711f482c3db5558718bc919b60a24f1a3444d9c29545328d22ce6e963Approve135936762024-04-22 3:14:062 days 19 hrs agoCronos ID Name robbie7769.cro IN  0x814920d1b8007207db6cb5a2dd92bf0b082bdba10 CRO0.23459270
0x890a5fe8e06b4e19e813fc773908684fa4728c3b72a287bdcd087b643fc350feApprove135894082024-04-21 20:30:393 days 1 hr ago0x0826a292c94b9b5ddc60681a6c0abb95379df965 IN  0x814920d1b8007207db6cb5a2dd92bf0b082bdba10 CRO0.23459270
0x4bb5dc8388d0edc819228acf41cef9ef84be74910ad3886de917b22786a131a3Approve135824902024-04-21 9:37:053 days 12 hrs ago0x25c303eba6f92597d405d4db4ba34833ce861566 IN  0x814920d1b8007207db6cb5a2dd92bf0b082bdba10 CRO0.23459270
0x62308b2385d6a5e62f6cb0afcc9775167043d132fe94ce700659450fe693fcdaApprove135784932024-04-21 3:19:503 days 18 hrs ago0x85d4328b0538af7483d16da689f69c961fa7460c IN  0x814920d1b8007207db6cb5a2dd92bf0b082bdba10 CRO0.23459270
0xa37e91cab70594523fcab31226eed0f17f0b268f49b2ccef7e4a40ba6177f0bcApprove135738202024-04-20 19:58:404 days 2 hrs ago0x229fd64c932e5689a8b1927cfb194bfdac7a5979 IN  0x814920d1b8007207db6cb5a2dd92bf0b082bdba10 CRO0.23691540
0x93c96303c640f1dc2277b975fe803a744cd281050ca084bb6dd28e6ce23427d9Approve135727152024-04-20 18:14:194 days 4 hrs ago0x1c274796cc49a866301e676c0875ca859ddc3c7b IN  0x814920d1b8007207db6cb5a2dd92bf0b082bdba10 CRO0.1506440
0x553383055895e94ff4d64472e761f9f71d9fec34c190b061c6c8144ffad1aafaApprove135678642024-04-20 10:32:264 days 11 hrs ago0x1ae36b87ddc795a9496709c059428f43c7bb6937 IN  0x814920d1b8007207db6cb5a2dd92bf0b082bdba10 CRO0.23459270
0x8dcb1a0aba31506da4766713f65f2b7135f22ff176b421e9ca2a89756e7605c8Approve135676902024-04-20 10:15:544 days 11 hrs ago0x1ae36b87ddc795a9496709c059428f43c7bb6937 IN  0x814920d1b8007207db6cb5a2dd92bf0b082bdba10 CRO0.23459270
0xbc9e3601adca09408fa24df7bd83b5109a3e3f1e6ff94885d020858435e32485Approve135519322024-04-19 9:27:025 days 12 hrs ago0x60a1fa63c6a582ecb3ec9498b397e16940aafe16 IN  0x814920d1b8007207db6cb5a2dd92bf0b082bdba10 CRO0.23459270
0x25ab5fb6c1e1977e9009f565d268ac8a4b4a8851aac87bb2b12096a09bf213beApprove135491462024-04-19 5:04:395 days 17 hrs ago0xdd05686ff53968bb43972bb31bf4076d532f50ad IN  0x814920d1b8007207db6cb5a2dd92bf0b082bdba10 CRO0.146255045 5,048.5
0xc0be81e83fd3aa33364793ded29f103bb8cb91c8ce2201a84ae30a9c43ea363eApprove135491442024-04-19 5:04:275 days 17 hrs ago0xdd05686ff53968bb43972bb31bf4076d532f50ad IN  0x814920d1b8007207db6cb5a2dd92bf0b082bdba10 CRO0.146132346635 5,044.2646405
0xced9d23e9d097212f80b6552f2220e8f3927300357e102e662139d6fdd3ab94dApprove135491412024-04-19 5:04:105 days 17 hrs ago0xdd05686ff53968bb43972bb31bf4076d532f50ad IN  0x814920d1b8007207db6cb5a2dd92bf0b082bdba10 CRO0.14617200684 5,045.63365
0x56af61c2601491bfd51d6ae8d4460cb25201874f81d8a52b8fea5ac7f6672942Approve135485432024-04-19 4:07:555 days 18 hrs ago0x049c4013fcf545366be36ecda4f30ecff07fb05f IN  0x814920d1b8007207db6cb5a2dd92bf0b082bdba10 CRO0.23459270
0xbaf843a074661fede1f72cf47aaedd6b64594a04e3e5971ee4ab481e53937eb0Approve135483002024-04-19 3:44:595 days 18 hrs ago0x08f9ce6e0c79234333e0f43b5026634f0e8da82b IN  0x814920d1b8007207db6cb5a2dd92bf0b082bdba10 CRO0.23459270
0xcb515875b9162fd9101a5278fa9802c4946163ccddfae707d4f893f2aa497cc9Approve135475572024-04-19 2:34:455 days 19 hrs agoCronos ID Name mcmc24.cro IN  0x814920d1b8007207db6cb5a2dd92bf0b082bdba10 CRO0.23459270
0xf69b6a9b2da786da6a0f1fd4094fc452d4c9dcdba9c62727eaf69fdabac6966bApprove135398532024-04-18 14:27:426 days 7 hrs ago0x5c6da74f53d951e53a66ef40fcb7bcb19d9f6530 IN  0x814920d1b8007207db6cb5a2dd92bf0b082bdba10 CRO0.1477470
0x789d40f06ad175daf0eb4425cda78fa72386c35817bb85824e0794a31e803e8dApprove135381032024-04-18 11:42:286 days 10 hrs ago0xfb149854ceddcaeb1e1f88c2f453acfc693cac73 IN  0x814920d1b8007207db6cb5a2dd92bf0b082bdba10 CRO0.23459270
0x2286adeddc2882aab54b1951cc9bcec4891f65fce3a85281d080925801f6311fApprove135345952024-04-18 6:10:516 days 16 hrs ago0xf72bcfafe2206658c989bbe410b68ee5e5051512 IN  0x814920d1b8007207db6cb5a2dd92bf0b082bdba10 CRO0.23459270
0xb172b9cd4bb976c1fbcf167bae773af338e964960276de4697c8f3c844e142a5Approve135271262024-04-17 18:26:377 days 3 hrs agoCronos ID Name greedyminer79.cro IN  0x814920d1b8007207db6cb5a2dd92bf0b082bdba10 CRO0.23459270
0x466d3800a29b0c48fac3a8901fdd7a123724b077a925890d7204c03b04513df9Approve135134582024-04-16 20:54:078 days 1 hr ago0x196bbccfcc5fd3b1ec15974d769b974e1c1675a9 IN  0x814920d1b8007207db6cb5a2dd92bf0b082bdba10 CRO0.23459270
0xae0f2c1e61910c4db219d1665e5355998a4144e55a213035ae409f9eb97cf693Approve135123512024-04-16 19:09:528 days 3 hrs ago0x2283201033967d3587a899f02f65691160a06f56 IN  0x814920d1b8007207db6cb5a2dd92bf0b082bdba10 CRO0.23459270
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0x476204e2e2aa05e65677440595078c62371714315f0963683f024eb8ebaa0707217062021-11-09 10:23:43897 days 11 hrs 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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