Contract 0xd0be1aaba78b7b4eb4c09719317529108a0d5c54

Txn Hash Method
Block
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Value [Txn Fee]
0x37aeae30950ba9c2b1a9e0f128c91e3c4a957dc494b340f8c09a4222738422c6Approve68118732023-02-04 19:00:475 hrs 55 mins ago0xc02e5a614ba5046edd3f2e811167f7343b207855 IN  0xd0be1aaba78b7b4eb4c09719317529108a0d5c540 CRO0.2238478585050
0x4b737a6de651e2446de54c6dc92de434545bccc5f3f336c1f3a1cbc049990d27Approve68024822023-02-04 4:16:0920 hrs 39 mins ago0x4ba7fe133a794445ec13ba282b12a4306885d9fc IN  0xd0be1aaba78b7b4eb4c09719317529108a0d5c540 CRO0.2238679256390
0xe284dafcb47a15d6b72e604be5f225a7e2b267aa6e6e600c0c8192952577ceb8Approve67974372023-02-03 20:20:461 day 4 hrs ago0xd3e060cdea712c0a453f1330216ed16850fe3f4f IN  0xd0be1aaba78b7b4eb4c09719317529108a0d5c540 CRO0.22394837354 4,820.863080469
0xdd9ff54f9ccdcf4a102c0d05a1dd090369d957e635b1f92fdf6fdc69e7e9552dApprove67845232023-02-03 0:04:402 days 51 mins ago0x6f968973ff2be9503baaaf04707b4cd34c95b55b IN  0xd0be1aaba78b7b4eb4c09719317529108a0d5c540 CRO0.2239064370090
0x87e83b5f02d907401bea02d41c6afec0fb6e8fad93912707521536f3aec9ffecApprove67821792023-02-02 20:23:482 days 4 hrs ago0x90dc0285ca1b07e1bade4fab59df5964d00cc5be IN  0xd0be1aaba78b7b4eb4c09719317529108a0d5c540 CRO0.22398106831 4,821.566890053
0x491705bceb92ebd876a1180af4bcbe6b03580a16c61d7d9aa02f271db0536133Approve67821272023-02-02 20:18:532 days 4 hrs ago0x5f3fb3e30bbba5b93d73c99c398c3f9616b91bfa IN  0xd0be1aaba78b7b4eb4c09719317529108a0d5c540 CRO0.23227 5,000
0xb21f3da643b4665e1a77a68cbcc41875e53942fb16b076079337c0fb1898b427Approve67781572023-02-02 14:04:202 days 10 hrs ago0x9ecb46c92ae036465c43a26b7918c325a82ae92d IN  0xd0be1aaba78b7b4eb4c09719317529108a0d5c540 CRO0.2239198510850
0xd5cbdb74e4dff030f31fe744b8ea1002e75fa7de87bd56bb9395e12d0ff7b210Approve67768492023-02-02 12:01:072 days 12 hrs ago0x058c1c2f9e370e3e279173df5e8515899b711977 IN  0xd0be1aaba78b7b4eb4c09719317529108a0d5c540 CRO0.232270
0x3a7731e4ac025ee980465593bb08d441d589cb861ac8a4154d7bc653891d5aabApprove67693862023-02-02 0:17:413 days 38 mins ago0xc64b600223e6a896140933337e3eaa0bd05e551d IN  0xd0be1aaba78b7b4eb4c09719317529108a0d5c540 CRO0.23227 5,000
0x5b56fab9f9bd57549e7befcdcb6569d29bc6e63d7b76fd2b90364d935daa868fApprove67679512023-02-01 22:02:163 days 2 hrs ago0x92030dda722f8e0cce0c5a22d62f4c96e252e8d9 IN  0xd0be1aaba78b7b4eb4c09719317529108a0d5c540 CRO0.23227 5,000
0xde21ce73901fa468c83936457531f64de6ed193269c07f8830003ef183adec52Approve67636732023-02-01 15:17:513 days 9 hrs ago0x567edf16b66683870acb2e21c3ccb95ba0b10f3a IN  0xd0be1aaba78b7b4eb4c09719317529108a0d5c540 CRO0.1280143904340
0xbc1b68e333db72dbedd37d6fcc9d17f2f79a9bb2999af3e68946642acd3fee15Approve67636702023-02-01 15:17:343 days 9 hrs ago0x567edf16b66683870acb2e21c3ccb95ba0b10f3a IN  0xd0be1aaba78b7b4eb4c09719317529108a0d5c540 CRO0.2239504653940
0x343baa35f3a1072e5f374c8dd1b8a8c8c79234af569ea563bd96deb091d8881eApprove67630522023-02-01 14:19:183 days 10 hrs ago0xd59498c2cd498c4b09da8d358850b8b73f108174 IN  0xd0be1aaba78b7b4eb4c09719317529108a0d5c540 CRO0.224021456815 4,822.436320127
0xefe0c714fc930cbfc3c656af48a2357de46a1cbea00828256bfc236ef719306bApprove67538042023-01-31 23:48:444 days 1 hr ago0x46f7a6c9550151d5a1d8aae9337a2f398f5dfea2 IN  0xd0be1aaba78b7b4eb4c09719317529108a0d5c540 CRO0.13277 5,000
0x76febded4e3b879ce5f5fc1dfeba150969a02b207cbf0ede44a097c145345855Approve67537972023-01-31 23:48:044 days 1 hr ago0x46f7a6c9550151d5a1d8aae9337a2f398f5dfea2 IN  0xd0be1aaba78b7b4eb4c09719317529108a0d5c540 CRO0.23227 5,000
0xd9e3d6ae988039650764e5e9e99d71382e107349e455d22c6773c687612b2b97Approve67505202023-01-31 18:39:274 days 6 hrs ago0xc1e756ad0c2219a42fd1c7bf9c3c709e75e0c840 IN  0xd0be1aaba78b7b4eb4c09719317529108a0d5c540 CRO0.224048464526 4,823.017706262
0x155ca42fab46d92028e03f8c22daacf87ab2e66d402ae0eef565d4458ae9f352Approve67503912023-01-31 18:27:174 days 6 hrs ago0x45d42f66bc0dec1f8ea8c34957be442185cdfbdd IN  0xd0be1aaba78b7b4eb4c09719317529108a0d5c540 CRO0.224414510991 4,830.897468275
0xe53bf47bc5177d49a83ad05d552b66291b7311607a101b8c2fb3dde6dd823946Approve67453852023-01-31 10:35:364 days 14 hrs ago0x195382134d425933a3d5e6a0c2b19a67be29b41c IN  0xd0be1aaba78b7b4eb4c09719317529108a0d5c540 CRO0.129062304526 4,860.371489271
0xe452455b152d4fea8e4c4129d180e4e598ec4dc541cf1f88ee2fb3f2d4508ae9Approve67453812023-01-31 10:35:144 days 14 hrs ago0x195382134d425933a3d5e6a0c2b19a67be29b41c IN  0xd0be1aaba78b7b4eb4c09719317529108a0d5c540 CRO0.226087371464 4,866.908586217
0x6a7ceef1bfbe86a8f19d513497d547af609f59f969b84b3f2557357c41e81bc1Approve67452182023-01-31 10:19:524 days 14 hrs ago0xa8957dc3515cf6cc7ef704c1c3e1e6c36115eac2 IN  0xd0be1aaba78b7b4eb4c09719317529108a0d5c540 CRO0.223990163040
0x8513d65c2997994f2b7040294862ec2ae25979816b25b5b455418e228ab8c7fcApprove67429482023-01-31 6:45:524 days 18 hrs ago0xb1920e98b81c68fc505d8f23aca086a9db7646c2 IN  0xd0be1aaba78b7b4eb4c09719317529108a0d5c540 CRO0.223995095320
0x9b03dad20e2bac51069b7eeac662a31460c5b9ccda22244593bd30b60b8067b2Approve67357852023-01-30 19:27:025 days 5 hrs ago0x24e277b144fcc0ead512e14bd5318df5ac96cada IN  0xd0be1aaba78b7b4eb4c09719317529108a0d5c540 CRO0.2240102079550
0xddb18dc86aafeeceb3345d5d22193936476258ce7638bce086403558e7a32836Approve67336342023-01-30 16:03:525 days 8 hrs ago0xe7f8b8ad6f9e2afadb0d6647c4072f5700506f89 IN  0xd0be1aaba78b7b4eb4c09719317529108a0d5c540 CRO0.23227 5,000
0x9e4fd45469c1d7e036e6debf6f01508735e32da113dd5b96bea1a5d6e9b5b916Approve67333212023-01-30 15:34:165 days 9 hrs ago0x70886cfe3287a77926c81b1dfcf9e111f6471bdd IN  0xd0be1aaba78b7b4eb4c09719317529108a0d5c540 CRO0.13277 5,000
0xa29f5c6ccefbaef7ca251c2269326c6c13cce610ffaaa3854d585206a9232816Approve67287592023-01-30 8:24:065 days 16 hrs ago0xf6152c540f25402d78dad0658ec70d0c5ebfe11c IN  0xd0be1aaba78b7b4eb4c09719317529108a0d5c540 CRO0.2240252247460
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0x4ac145ff7b5895a05d4f82c92d66b3151320fae00ad9b7c9bd5571c125b0855e30299952022-06-01 8:09:11248 days 16 hrs ago VVS Finance: Factory  Contract Creation0 CRO
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Similar Match Source Code
Note: This contract matches the deployed ByteCode of the Source Code for Contract 0xa111c17f8b8303280d3eb01bbcd61000aa7f39f9

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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