Contract 0x8f09fff247b8fdb80461e5cf5e82dd1ae2ebd6d7 1

Txn Hash Method
Block
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Value [Txn Fee]
0x0e849f661cd3b3c7bed6a37c7a2d50563dae6e2a87610b5ce7865058ad73a1dcTransfer49125672022-10-03 3:27:135 hrs 44 mins ago0x8e82294274b241f5a39b15cd79371b22941f7817 IN  0x8f09fff247b8fdb80461e5cf5e82dd1ae2ebd6d70 CRO0.216791077918 4,907.440191924
0x7636b95db4fb829eeaf1aa95978fa887e3b3ab0628fa908d74bb064f4773b40dApprove49114332022-10-03 1:39:557 hrs 31 mins ago0x9018c35588eb6b0acf66a51e164bae6f255aafae IN  0x8f09fff247b8fdb80461e5cf5e82dd1ae2ebd6d70 CRO0.22177 5,000
0x3d5fb688843f96a78487cc36974c58dd4dfabd69a8f89f4b7fa22ea2d2e96ae9Approve49114272022-10-03 1:39:217 hrs 31 mins ago0x8e82294274b241f5a39b15cd79371b22941f7817 IN  0x8f09fff247b8fdb80461e5cf5e82dd1ae2ebd6d70 CRO0.22177 5,000
0x101b035fab479a93171f060c3fb11b76bee77f9b179755f90ea088acaf59dda3Approve49084342022-10-02 20:56:3412 hrs 14 mins ago0x85f6d6e59f13ddcfc874d165a71e5a4e576787af IN  0x8f09fff247b8fdb80461e5cf5e82dd1ae2ebd6d70 CRO0.221770
0x16624d41c1095998a23a084c1e8bf46f8ce0f0d536ba5057d039552d6564e805Approve48828502022-10-01 4:37:182 days 4 hrs ago0x7c918809a7be3922434e107b66ef960f5f04c771 IN  0x8f09fff247b8fdb80461e5cf5e82dd1ae2ebd6d70 CRO0.1234382889320
0x61b0b7f8670844b1f1ea07b20bd9743646598d9bcb46178bcf646989f78eeb34Approve48828442022-10-01 4:36:442 days 4 hrs ago0x7c918809a7be3922434e107b66ef960f5f04c771 IN  0x8f09fff247b8fdb80461e5cf5e82dd1ae2ebd6d70 CRO0.217658508510
0xb0d24ba7fe9667e60106b5a62cffb6e23eb99df9e31443ad46217030b9c1110cApprove48572002022-09-29 12:08:033 days 21 hrs ago0x9fdaef4243cae8b6a7c1d5a26ba43690f04aee08 IN  0x8f09fff247b8fdb80461e5cf5e82dd1ae2ebd6d70 CRO0.221770
0x8e634a29eb82d8f93198a6f13a335d48ead62e34411a873b2472458a555cb4d2Approve48527962022-09-29 5:11:324 days 3 hrs ago0x5fd2ee03d96f53db1d563630749a4730df5e343a IN  0x8f09fff247b8fdb80461e5cf5e82dd1ae2ebd6d70 CRO0.217718214893 4,908.648935687
0x1cae5dd80489c8478cdbd46abed1b5eb8e48dd01ee2f4c0fb7ea3fdf696e6137Approve48420982022-09-28 12:19:284 days 20 hrs ago0x36c7e6f401961c60dfa489534288257f0abe8c73 IN  0x8f09fff247b8fdb80461e5cf5e82dd1ae2ebd6d70 CRO0.221770
0x18a2232154166d2227e11c9568325325387cf24aaa02cac28ffcc267bd171553Approve48371132022-09-28 4:27:085 days 4 hrs ago0x050b6bb77fa6e694f464e24e0ba4a35966a0e942 IN  0x8f09fff247b8fdb80461e5cf5e82dd1ae2ebd6d70 CRO0.2177504730350
0x09888058fc3148ffb0b6ced5535a97a0986b682862a47b7495da315b2243d90aApprove48280452022-09-27 14:06:135 days 19 hrs ago0x63a6afd857e541b731c90f153a81539e06d295c5 IN  0x8f09fff247b8fdb80461e5cf5e82dd1ae2ebd6d70 CRO0.2177689676530
0xc6046b6beefeca259f1dffbff8fa507fd8bc1803abfad16e8a3de16248f55ba7Approve48231082022-09-27 6:17:256 days 2 hrs ago0x62b17a636817fe2a5209c66e0b034a124d430ebe IN  0x8f09fff247b8fdb80461e5cf5e82dd1ae2ebd6d70 CRO0.221770
0xc255da5f41bb134d3e7dfa47820039da9ab174e71de356b1fbe790ab72509576Approve48194632022-09-27 0:31:126 days 8 hrs ago0xceab4a98d9bb9674925664f1c7cb215daf009f8f IN  0x8f09fff247b8fdb80461e5cf5e82dd1ae2ebd6d70 CRO0.2177863823720
0xc3877b033fc0c46e45a98065a642b926e588a171ed00a121459f4724534840acApprove48147282022-09-26 17:02:246 days 16 hrs ago0x4830738927b94c506f465dcad04ab111a867872d IN  0x8f09fff247b8fdb80461e5cf5e82dd1ae2ebd6d70 CRO0.21779602990
0xf7bda2adc6a90b52186ed5f209b3fa3174f5939172b1406238f9f03a86fef85fApprove48075272022-09-26 5:39:467 days 3 hrs ago0x929f79c932c76dfcfa572e1bf4ee2a05c0674b96 IN  0x8f09fff247b8fdb80461e5cf5e82dd1ae2ebd6d70 CRO0.2163373973480
0x7eb5c4de4331d0a0a0210e4fbd76e430d0054aa87d8abba767abb0938372c029Approve48007012022-09-25 18:52:597 days 14 hrs ago0x1df780f8afa0010309cd5f2b860cd399e1f598ff IN  0x8f09fff247b8fdb80461e5cf5e82dd1ae2ebd6d70 CRO0.221770
0x9c90658dd3878a78c1c19e0725e23139d90abac98fcf4e4a6a5b0d375484ed1bApprove47922082022-09-25 5:27:598 days 3 hrs ago0x9e16c20ad2b53a83f6a2bc5653f33b00af56f733 IN  0x8f09fff247b8fdb80461e5cf5e82dd1ae2ebd6d70 CRO0.221770
0x3c3131b7845dbd923c17f39d343134b814a8c40301a44e1ab334e7c6923ecd5aApprove47889292022-09-25 0:17:308 days 8 hrs ago0xd49498ba7b7b26829e4c991254524a788c7e5ff6 IN  0x8f09fff247b8fdb80461e5cf5e82dd1ae2ebd6d70 CRO0.221770
0x4ecf687982be73cb829ad06b36549ad3fc2f7adc8705a23ae6cfe324311a5c71Approve47864582022-09-24 20:23:188 days 12 hrs ago0x62c225bda4f8ca0daa1595acad9340a594484e5d IN  0x8f09fff247b8fdb80461e5cf5e82dd1ae2ebd6d70 CRO0.216564213139 4,913.204163973
0x336f747e4328678ab32fea7fb791b9cc2457ffe0c16382c8cbb655d0c4a748fbApprove47846782022-09-24 17:34:118 days 15 hrs ago0x63491695bade7e00df6057683d3eecc34cbdef13 IN  0x8f09fff247b8fdb80461e5cf5e82dd1ae2ebd6d70 CRO0.113835540130
0xd01f0cc44a38b1974e7b79b8c28fee263edd05773c804f91adcd43dd241890ffApprove47784982022-09-24 7:48:149 days 1 hr ago0x7e0b4cd0a28e63c41afe6fa1dbfeb71e0f79ee4a IN  0x8f09fff247b8fdb80461e5cf5e82dd1ae2ebd6d70 CRO0.221770
0x6f8899adcf6fbaa426a2231a6d06ad76ab19dff1c47b3097006a3b5548681639Approve47768892022-09-24 5:16:089 days 3 hrs ago0xbb9bf26dd540460821ab7d8ce6c8fc94c774d3e6 IN  0x8f09fff247b8fdb80461e5cf5e82dd1ae2ebd6d70 CRO0.217939697958 4,913.642466482
0x7a55cb4cc471a2dde78deff08079f52b721bd14da1212f955f6cf6a67c15bf95Approve47764022022-09-24 4:30:059 days 4 hrs ago0x21c05155f8e2acb55c8e4f8c892e16ca067a4efd IN  0x8f09fff247b8fdb80461e5cf5e82dd1ae2ebd6d70 CRO0.221770
0x829232ed91ff7e5382362aaa1d3a4e99c3daa3d3e3ef66b1e8d60f57bf6173b1Approve47762752022-09-24 4:18:079 days 4 hrs ago0x3f55beeefc44aadd9cbbff934de3dc75a57ad656 IN  0x8f09fff247b8fdb80461e5cf5e82dd1ae2ebd6d70 CRO0.22177 5,000
0x7a643f680082ceabaa24531fe164985620f457462bf46716ade1d740bec7b982Approve47761632022-09-24 4:07:279 days 5 hrs ago0x3f55beeefc44aadd9cbbff934de3dc75a57ad656 IN  0x8f09fff247b8fdb80461e5cf5e82dd1ae2ebd6d70 CRO0.22177 5,000
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0x6f015736ab7e5c650541fbd579b9a41635d81cc5e1363ff2ba38bb030b8be6ac178252021-11-09 4:26:09328 days 4 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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