Token
Pair LPs (Pair-LP)
ERC-20
Overview
Max Total Supply
0.00000340734500748 Pair-LP
Holders
1
Total Transfers
-
Market
Price
-
Onchain Market Cap
-
Circulating Supply Market Cap
-
Other Info
Token Contract (WITH 18 Decimals)
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Contract Name:
Pair
Compiler Version
v0.6.12+commit.27d51765
Optimization Enabled:
Yes with 200 runs
Other Settings:
istanbul EvmVersion
Contract Source Code (Solidity Standard Json-Input format)
// SPDX-License-Identifier: GPL-3.0 pragma solidity =0.6.12; import "./interfaces/IPair.sol"; import "./PairERC20.sol"; import "./libraries/Math.sol"; import "./libraries/UQ112x112.sol"; import "./interfaces/IERC20.sol"; import "./interfaces/IFactory.sol"; import "./interfaces/ICallee.sol"; contract Pair is PairERC20 { using SafeMath for uint256; using UQ112x112 for uint224; uint256 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; uint256 public constant FEE_DENOMINATOR = 100000; uint256 public constant MAX_FEE_AMOUNT = 3000; // = 3% uint256 public constant MIN_FEE_AMOUNT = 10; // = 0.01% uint256 public feeAmount = 300; // default = 0.3% 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 uint256 public price0CumulativeLast; uint256 public price1CumulativeLast; uint256 public kLast; // reserve0 * reserve1, as of immediately after the most recent liquidity event uint256 private unlocked = 1; uint256 public constant PRECISION_FACTOR = 1e4; modifier lock() { require(unlocked == 1, "Pair: 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, uint256 value ) private { (bool success, bytes memory data) = token.call(abi.encodeWithSelector(SELECTOR, to, value)); require(success && (data.length == 0 || abi.decode(data, (bool))), "Pair: TRANSFER_FAILED"); } event FeeAmountUpdated(uint256 prevFeeAmount, uint256 feeAmount); event Mint(address indexed sender, uint256 amount0, uint256 amount1); event Burn(address indexed sender, uint256 amount0, uint256 amount1, address indexed to); event Swap(address indexed sender, uint256 amount0In, uint256 amount1In, uint256 amount0Out, uint256 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, "Pair: FORBIDDEN"); // sufficient check token0 = _token0; token1 = _token1; } /** * @dev Updates the swap fees amount * * Can only be called by the factory's owner */ function setFeeAmount(uint256 newFeeAmount) external { require(msg.sender == IFactory(factory).feeToSetter(), "Pair: only factory's feeToSetter"); require(newFeeAmount <= MAX_FEE_AMOUNT, "Pair: feeAmount mustn't exceed the maximum"); require(newFeeAmount >= MIN_FEE_AMOUNT, "Pair: feeAmount mustn't exceed the minimum"); uint256 prevFeeAmount = feeAmount; feeAmount = newFeeAmount; emit FeeAmountUpdated(prevFeeAmount, newFeeAmount); } // update reserves and, on the first call per block, price accumulators function _update( uint256 balance0, uint256 balance1, uint112 _reserve0, uint112 _reserve1 ) private { require(balance0 <= uint112(-1) && balance1 <= uint112(-1), "Pair: 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 += uint256(UQ112x112.encode(_reserve1).uqdiv(_reserve0)) * timeElapsed; price1CumulativeLast += uint256(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 1/2th of the growth in sqrt(k) function _mintFee(uint112 _reserve0, uint112 _reserve1) private returns (bool feeOn) { address feeTo = IFactory(factory).feeTo(); feeOn = feeTo != address(0); uint256 _kLast = kLast; // gas savings if (feeOn) { if (_kLast != 0) { uint256 rootK = Math.sqrt(uint256(_reserve0).mul(_reserve1)); uint256 rootKLast = Math.sqrt(_kLast); if (rootK > rootKLast) { uint256 d = ((FEE_DENOMINATOR.mul(PRECISION_FACTOR) / IFactory(factory).ownerFeeShare()).sub( uint256(1).mul(PRECISION_FACTOR))); uint256 numerator = totalSupply.mul(rootK.sub(rootKLast)); uint256 denominator = ((rootK.mul(d)) / PRECISION_FACTOR).add(rootKLast); uint256 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 (uint256 liquidity) { (uint112 _reserve0, uint112 _reserve1, ) = getReserves(); // gas savings uint256 balance0 = IERC20(token0).balanceOf(address(this)); uint256 balance1 = IERC20(token1).balanceOf(address(this)); uint256 amount0 = balance0.sub(_reserve0); uint256 amount1 = balance1.sub(_reserve1); bool feeOn = _mintFee(_reserve0, _reserve1); uint256 _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, "Pair: INSUFFICIENT_LIQUIDITY_MINTED"); _mint(to, liquidity); _update(balance0, balance1, _reserve0, _reserve1); if (feeOn) kLast = uint256(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 (uint256 amount0, uint256 amount1) { (uint112 _reserve0, uint112 _reserve1, ) = getReserves(); // gas savings address _token0 = token0; // gas savings address _token1 = token1; // gas savings uint256 balance0 = IERC20(_token0).balanceOf(address(this)); uint256 balance1 = IERC20(_token1).balanceOf(address(this)); uint256 liquidity = balanceOf[address(this)]; bool feeOn = _mintFee(_reserve0, _reserve1); uint256 _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 // we change from AND to OR that in case of extreme pair collapses the user is still able to burn require(amount0 > 0 || amount1 > 0, "Pair: 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 = uint256(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( uint256 amount0Out, uint256 amount1Out, address to, bytes calldata data ) external lock { require(amount0Out > 0 || amount1Out > 0, "Pair: INSUFFICIENT_OUTPUT_AMOUNT"); (uint112 _reserve0, uint112 _reserve1, ) = getReserves(); // gas savings require(amount0Out < _reserve0 && amount1Out < _reserve1, "Pair: INSUFFICIENT_LIQUIDITY"); uint256 balance0; uint256 balance1; { // scope for _token{0,1}, avoids stack too deep errors address _token0 = token0; address _token1 = token1; require(to != _token0 && to != _token1, "Pair: 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) ICallee(to).doCall(msg.sender, amount0Out, amount1Out, data); balance0 = IERC20(_token0).balanceOf(address(this)); balance1 = IERC20(_token1).balanceOf(address(this)); } uint256 amount0In = balance0 > _reserve0 - amount0Out ? balance0 - (_reserve0 - amount0Out) : 0; uint256 amount1In = balance1 > _reserve1 - amount1Out ? balance1 - (_reserve1 - amount1Out) : 0; require(amount0In > 0 || amount1In > 0, "Pair: INSUFFICIENT_INPUT_AMOUNT"); { uint256 _feeAmount = feeAmount; uint256 feeDenominator = FEE_DENOMINATOR; // scope for reserve{0,1}Adjusted, avoids stack too deep errors uint256 balance0Adjusted = balance0.mul(feeDenominator).sub(amount0In.mul(_feeAmount)); uint256 balance1Adjusted = balance1.mul(feeDenominator).sub(amount1In.mul(_feeAmount)); require(balance0Adjusted.mul(balance1Adjusted) >= uint256(_reserve0).mul(_reserve1).mul(feeDenominator**2), "Pair: 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); } }
// SPDX-License-Identifier: GPL-3.0 pragma solidity =0.6.12; // 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); } }
// SPDX-License-Identifier: GPL-3.0 pragma solidity =0.6.12; // a library for performing overflow-safe math, courtesy of DappHub (https://github.com/dapphub/ds-math) library SafeMath { function add(uint256 x, uint256 y) internal pure returns (uint256 z) { require((z = x + y) >= x, "ds-math-add-overflow"); } function sub(uint256 x, uint256 y) internal pure returns (uint256 z) { require((z = x - y) <= x, "ds-math-sub-underflow"); } function mul(uint256 x, uint256 y) internal pure returns (uint256 z) { require(y == 0 || (z = x * y) / y == x, "ds-math-mul-overflow"); } }
// SPDX-License-Identifier: GPL-3.0 pragma solidity =0.6.12; // a library for performing various math operations library Math { function min(uint256 x, uint256 y) internal pure returns (uint256 z) { z = x < y ? x : y; } // babylonian method (https://en.wikipedia.org/wiki/Methods_of_computing_square_roots#Babylonian_method) function sqrt(uint256 y) internal pure returns (uint256 z) { if (y > 3) { z = y; uint256 x = y / 2 + 1; while (x < z) { z = x; x = (y / x + x) / 2; } } else if (y != 0) { z = 1; } } }
// SPDX-License-Identifier: GPL-3.0 pragma solidity >=0.5.0; interface IPair { event Approval(address indexed owner, address indexed spender, uint256 value); event Transfer(address indexed from, address indexed to, uint256 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 (uint256); function balanceOf(address owner) external view returns (uint256); function allowance(address owner, address spender) external view returns (uint256); function approve(address spender, uint256 value) external returns (bool); function transfer(address to, uint256 value) external returns (bool); function transferFrom( address from, address to, uint256 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 (uint256); function permit( address owner, address spender, uint256 value, uint256 deadline, uint8 v, bytes32 r, bytes32 s ) external; event FeeAmountUpdated(uint256 prevFeeAmount, uint256 feeAmount); event Mint(address indexed sender, uint256 amount0, uint256 amount1); event Burn(address indexed sender, uint256 amount0, uint256 amount1, address indexed to); event Swap(address indexed sender, uint256 amount0In, uint256 amount1In, uint256 amount0Out, uint256 amount1Out, address indexed to); event Sync(uint112 reserve0, uint112 reserve1); function MINIMUM_LIQUIDITY() external pure returns (uint256); 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 (uint256); function price1CumulativeLast() external view returns (uint256); function kLast() external view returns (uint256); function mint(address to) external returns (uint256 liquidity); function burn(address to) external returns (uint256 amount0, uint256 amount1); function swap( uint256 amount0Out, uint256 amount1Out, address to, bytes calldata data ) external; function skim(address to) external; function sync() external; function initialize(address, address) external; function feeAmount() external view returns (uint256); }
// SPDX-License-Identifier: GPL-3.0 pragma solidity >=0.5.0; interface IFactory { event PairCreated(address indexed token0, address indexed token1, address pair, uint256); 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(uint256) external view returns (address pair); function allPairsLength() external view returns (uint256); function createPair(address tokenA, address tokenB) external returns (address pair); function setFeeTo(address) external; function setFeeToSetter(address) external; function ownerFeeShare() external view returns (uint256); }
// SPDX-License-Identifier: GPL-3.0 pragma solidity >=0.5.0; interface IERC20 { event Approval(address indexed owner, address indexed spender, uint256 value); event Transfer(address indexed from, address indexed to, uint256 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 (uint256); function balanceOf(address owner) external view returns (uint256); function allowance(address owner, address spender) external view returns (uint256); function approve(address spender, uint256 value) external returns (bool); function transfer(address to, uint256 value) external returns (bool); function transferFrom( address from, address to, uint256 value ) external returns (bool); }
// SPDX-License-Identifier: GPL-3.0 pragma solidity >=0.5.0; interface ICallee { function doCall( address sender, uint256 amount0, uint256 amount1, bytes calldata data ) external; }
// SPDX-License-Identifier: GPL-3.0 pragma solidity >=0.6.12; import "./libraries/SafeMath.sol"; contract PairERC20 { using SafeMath for uint256; string public constant name = "Pair LPs"; string public constant symbol = "Pair-LP"; uint8 public constant decimals = 18; uint256 public totalSupply; mapping(address => uint256) public balanceOf; mapping(address => mapping(address => uint256)) 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 => uint256) public nonces; event Approval(address indexed owner, address indexed spender, uint256 value); event Transfer(address indexed from, address indexed to, uint256 value); address private immutable _CACHED_THIS; uint256 private immutable _CACHED_CHAIN_ID; bytes32 private immutable _CACHED_DOMAIN_SEPARATOR; constructor() public { uint256 chainId; assembly { chainId := chainid() } _CACHED_DOMAIN_SEPARATOR = _buildDomainSeperator(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) // ) // ); _CACHED_CHAIN_ID = chainId; _CACHED_THIS = address(this); } function domainSeparator() public view returns (bytes32) { uint256 chainId; assembly { chainId := chainid() } if (_CACHED_THIS == address(this) && _CACHED_CHAIN_ID == chainId) { return _CACHED_DOMAIN_SEPARATOR; } else { return _buildDomainSeperator(chainId); } } function _buildDomainSeperator(uint256 _chainId) private view returns (bytes32) { return 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, uint256 value) internal { totalSupply = totalSupply.add(value); balanceOf[to] = balanceOf[to].add(value); emit Transfer(address(0), to, value); } function _burn(address from, uint256 value) internal { balanceOf[from] = balanceOf[from].sub(value); totalSupply = totalSupply.sub(value); emit Transfer(from, address(0), value); } function _approve( address owner, address spender, uint256 value ) private { allowance[owner][spender] = value; emit Approval(owner, spender, value); } function _transfer( address from, address to, uint256 value ) private { balanceOf[from] = balanceOf[from].sub(value); balanceOf[to] = balanceOf[to].add(value); emit Transfer(from, to, value); } function approve(address spender, uint256 value) external returns (bool) { _approve(msg.sender, spender, value); return true; } function transfer(address to, uint256 value) external returns (bool) { _transfer(msg.sender, to, value); return true; } function transferFrom( address from, address to, uint256 value ) external returns (bool) { if (allowance[from][msg.sender] != uint256(-1)) { // allowance[from][msg.sender] = allowance[from][msg.sender].sub(value); _approve(from, msg.sender, allowance[from][msg.sender].sub(value)); } _transfer(from, to, value); return true; } function permit( address owner, address spender, uint256 value, uint256 deadline, uint8 v, bytes32 r, bytes32 s ) external { require(deadline >= block.timestamp, "Pair: EXPIRED"); bytes32 digest = keccak256( abi.encodePacked("\x19\x01", domainSeparator(), keccak256(abi.encode(PERMIT_TYPEHASH, owner, spender, value, nonces[owner]++, deadline))) ); address recoveredAddress = ecrecover(digest, v, r, s); require(recoveredAddress != address(0) && recoveredAddress == owner, "Pair: INVALID_SIGNATURE"); _approve(owner, spender, value); } }
{ "remappings": [], "optimizer": { "enabled": true, "runs": 200 }, "evmVersion": "istanbul", "libraries": {}, "outputSelection": { "*": { "*": [ "evm.bytecode", "evm.deployedBytecode", "devdoc", "userdoc", "metadata", "abi" ] } } }
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:"address","name":"_token0","type":"address"},{"internalType":"address","name":"_token1","type":"address"}],"name":"initialize","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"kLast","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"to","type":"address"}],"name":"mint","outputs":[{"internalType":"uint256","name":"liquidity","type":"uint256"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"name","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"nonces","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"owner","type":"address"},{"internalType":"address","name":"spender","type":"address"},{"internalType":"uint256","name":"value","type":"uint256"},{"internalType":"uint256","name":"deadline","type":"uint256"},{"internalType":"uint8","name":"v","type":"uint8"},{"internalType":"bytes32","name":"r","type":"bytes32"},{"internalType":"bytes32","name":"s","type":"bytes32"}],"name":"permit","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"price0CumulativeLast","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"price1CumulativeLast","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"newFeeAmount","type":"uint256"}],"name":"setFeeAmount","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"to","type":"address"}],"name":"skim","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"amount0Out","type":"uint256"},{"internalType":"uint256","name":"amount1Out","type":"uint256"},{"internalType":"address","name":"to","type":"address"},{"internalType":"bytes","name":"data","type":"bytes"}],"name":"swap","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"symbol","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"sync","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"token0","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"token1","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"totalSupply","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"value","type":"uint256"}],"name":"transfer","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"from","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"value","type":"uint256"}],"name":"transferFrom","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"}]
Contract Creation Code
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