Contract 0xe61db569e231b3f5530168aa2c9d50246525b6d6 1

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0x78796c8b1e666739c2a78cacfed5de72a12e559949c4822286a581782cbea514Approve48436322022-09-28 14:45:071 hr 53 mins ago0x925398eceedc559f2cb44587a5aeb015880700d5 IN  0xe61db569e231b3f5530168aa2c9d50246525b6d60 CRO0.2177369885970
0x6520aeaad1caed4c033a5814edb4d9fb778b2a25a51b8551058e0ebaa09b0b2cApprove48429872022-09-28 13:43:592 hrs 54 mins ago0x9c7222f1878b07305196aa46a799c67bb6a7ff25 IN  0xe61db569e231b3f5530168aa2c9d50246525b6d60 CRO0.2177383124580
0x64f2ca00295a5826eb7d88a36bc10697fdc362a28f13c9fb11d8edb958f6b2fbApprove48423112022-09-28 12:39:443 hrs 58 mins ago0x65a406973276c57647e2e6eb54e0ec50d23d8954 IN  0xe61db569e231b3f5530168aa2c9d50246525b6d60 CRO0.2177397013370
0x3dfa49bd59429ea5babc2c271daecf8c35e1f9b8550e3c705af8ab8c8b5df803Approve48416512022-09-28 11:37:055 hrs 1 min ago0x12721fa4f1b82bec3dceb971d3a18857b9bf44e3 IN  0xe61db569e231b3f5530168aa2c9d50246525b6d60 CRO0.2177410664630
0xa1616c26909ee3e4fed495395f51c48558b0a5b7620f313e2e297ca1efc47c68Approve48408982022-09-28 10:25:336 hrs 12 mins ago0xf3358087419b2c43a0e7a5790a6c46aa4b104df8 IN  0xe61db569e231b3f5530168aa2c9d50246525b6d60 CRO0.2177426124560
0x82811156e15f93d06f9f0dbc1dcdb259ac55f4a739e36937960b50207f4e8d76Approve48403612022-09-28 9:34:427 hrs 3 mins ago0x9dbbad5f64a76b40136ff111a53c1161e4082d23 IN  0xe61db569e231b3f5530168aa2c9d50246525b6d60 CRO0.2177437218640
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0x1429711bb12dd6421bed0cd772258ba8d0cbf0518355eb35c47850cc04f8f29dApprove48385352022-09-28 6:41:449 hrs 56 mins ago0xca7dbd3ce11562e97b4986f960c6c75ad868b5ed IN  0xe61db569e231b3f5530168aa2c9d50246525b6d60 CRO0.217747538020
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0x66a9bdce740ede48b2cb1239b97cf7d6a8034a49ca5f3cbb133ce0b9ff86e3b5Approve48378972022-09-28 5:41:1910 hrs 57 mins ago0x2c921880467af9e44a7271e777ad05f50405d0e8 IN  0xe61db569e231b3f5530168aa2c9d50246525b6d60 CRO0.2177488528380
0x0e27583c18eefbb245ab823a4ff0d2524456a9101d15275eba8e618f702bd678Approve48376832022-09-28 5:21:0511 hrs 17 mins ago0x5a1b77f0c29b9502bc4c01d77475d5bfc806ec68 IN  0xe61db569e231b3f5530168aa2c9d50246525b6d60 CRO0.2177492978010
0x7f437dcc2ed69118fce20495b4bb5e041b605ed4b169b6361de68fe1e8e5447cApprove48373982022-09-28 4:54:0411 hrs 44 mins ago0xf92596eedb1b91823ee7811ccf19a9a3eb1d16e1 IN  0xe61db569e231b3f5530168aa2c9d50246525b6d60 CRO0.2177498905660
0xc1cbe1745a3b18583975c19d2622ac4eb81025d88563d41a35b77d4f9e29b830Approve48371842022-09-28 4:33:5112 hrs 4 mins ago0x6ebc4ec62bb39e3e7200db57d31f9339906d5513 IN  0xe61db569e231b3f5530168aa2c9d50246525b6d60 CRO0.2177503310560
0x7c83d022ff20abd2f35130c4c2ac9f52838daddd636e373efc2e23f551166d6cApprove48371352022-09-28 4:29:1312 hrs 9 mins ago0x050b6bb77fa6e694f464e24e0ba4a35966a0e942 IN  0xe61db569e231b3f5530168aa2c9d50246525b6d60 CRO0.2177504288160
0x905baac7e2831d35e16c2b8d2550f0671e8ab0bff5891effd22bade0dd2fcfb5Approve48370392022-09-28 4:20:0812 hrs 18 mins ago0x050b6bb77fa6e694f464e24e0ba4a35966a0e942 IN  0xe61db569e231b3f5530168aa2c9d50246525b6d60 CRO0.2177506272410
0x53bb381c5c6ed5d2403a0eaee36d7ae1da2c8eb27e8a4ddffd2d626986d4131fApprove48369842022-09-28 4:14:5512 hrs 23 mins ago0xcb8e79b4777e12e08e7d00d821cd1f7bd18d9d3c IN  0xe61db569e231b3f5530168aa2c9d50246525b6d60 CRO0.217750743070
0x3ad76458a388a5c5c6b39d6fc1f3857ce2f35754e902e8b72af31c9cd0ac4d12Approve48368242022-09-28 3:59:5012 hrs 38 mins ago0xfaf92310a065f749a5e65713d0a6250b67827aa7 IN  0xe61db569e231b3f5530168aa2c9d50246525b6d60 CRO0.221770
0x3582f6931f67f5fe2f8c1bb7a5de1f95b41f79d248212fc664fdb074e630551bApprove48363462022-09-28 3:14:3913 hrs 23 mins ago0x167664e3df8e7ea4c6715059a224f8bdd75e3cbc IN  0xe61db569e231b3f5530168aa2c9d50246525b6d60 CRO0.2177520691720
0x4ff234c37f69012a75a65c6746dd70c57a3db3696fa0866791a01d15e840abfdApprove48354392022-09-28 1:48:2714 hrs 49 mins ago0xf921cb5e41fbf03bfbe2763adcb6c9a5d74da97b IN  0xe61db569e231b3f5530168aa2c9d50246525b6d60 CRO0.2177539347580
0x963b8e5a79e42983606c73a8a857b557ccff386d7e123f123c8c2ba6cf04cf49Approve48354002022-09-28 1:44:4614 hrs 53 mins ago0xb702e7f4101f98f30d43b1a316718f68b0ee8e1d IN  0xe61db569e231b3f5530168aa2c9d50246525b6d60 CRO0.2177539939690
0x0b8515bdb60546401f86592f42c0e844e48d0912d670047a47653d7b86a774bbApprove48352902022-09-28 1:34:2215 hrs 4 mins ago0x246857343312b33832c8338db51a0857292385b5 IN  0xe61db569e231b3f5530168aa2c9d50246525b6d60 CRO0.2177542253310
0xa86d2cab048bbefe11018ac9b9792d9af81a194b6792e9a4d2f2a5a9ba10f981Approve48345812022-09-28 0:27:0516 hrs 11 mins ago0x1c52a583024b60ea5720d6d095b4e604c2dd2fc6 IN  0xe61db569e231b3f5530168aa2c9d50246525b6d60 CRO0.2177556786320
0xc973ac5c2e97d0e8579049c003749881e37abe093d0e246f31164368bc90018dApprove48340512022-09-27 23:36:4617 hrs 1 min ago0x3b2b529d2f8fd1c440166100e79ec73c25a7fe14 IN  0xe61db569e231b3f5530168aa2c9d50246525b6d60 CRO0.2177567776970
0xef5dc2720efbb7f18d19ce8543562cb97f0f97381707863734a18b0af2ef28c7Approve48331382022-09-27 22:10:0318 hrs 28 mins ago0x58cd2f367b03e5f6bf6722ec285e4fec97035d43 IN  0xe61db569e231b3f5530168aa2c9d50246525b6d60 CRO0.221770
0x3b1eccc5bd7832f3fb7d45034737e2aed0d1521a5f79d420e844e1c8cfc7f9c1Approve48330452022-09-27 22:01:1618 hrs 37 mins ago0x9e41e5d161fb65ec8105c9d7f0df39edaff54333 IN  0xe61db569e231b3f5530168aa2c9d50246525b6d60 CRO0.125770
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0x1023c95547f377324ae1c43152825230ad17b4aa2864967ffbfaba8b9c302a61177982021-11-09 4:23:41323 days 12 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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