Address Contract Partially Verified
Address
0xC14d550632db8592D1243Edc8B95b0Ad06703867
Balance
0 ETH
Nonce
1
Code Size
23773 bytes
Creator
0x26Ce2091...93ef at tx 0xb8e8e691...d3cece
Indexed Transactions
0
Contract Bytecode
23773 bytes
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Verified Source Code Partial Match
Compiler: v0.8.15+commit.e14f2714
EVM: london
Optimization: Yes (100000 runs)
FraxswapRouter.sol 985 lines
// SPDX-License-Identifier: GPL-2.0-or-later
pragma solidity >=0.8.0;
// Sources flattened with hardhat v2.10.1 https://hardhat.org
// File contracts/Fraxswap/core/interfaces/IUniswapV2FactoryV5.sol
interface IUniswapV2FactoryV5 {
event PairCreated(address indexed token0, address indexed token1, address pair, uint);
function feeTo() external view returns (address);
function feeToSetter() external view returns (address);
function globalPause() external view returns (bool);
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 createPair(address tokenA, address tokenB, uint fee) external returns (address pair);
function setFeeTo(address) external;
function setFeeToSetter(address) external;
function toggleGlobalPause() external;
}
// File contracts/Fraxswap/core/interfaces/IUniswapV2PairV5.sol
interface IUniswapV2PairV5 {
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 contracts/Fraxswap/core/interfaces/IFraxswapPair.sol
// ====================================================================
// | ______ _______ |
// | / _____________ __ __ / ____(_____ ____ _____ ________ |
// | / /_ / ___/ __ `| |/_/ / /_ / / __ \/ __ `/ __ \/ ___/ _ \ |
// | / __/ / / / /_/ _> < / __/ / / / / / /_/ / / / / /__/ __/ |
// | /_/ /_/ \__,_/_/|_| /_/ /_/_/ /_/\__,_/_/ /_/\___/\___/ |
// | |
// ====================================================================
// ========================= IFraxswapPair ==========================
// ====================================================================
// Fraxswap LP Pair Interface
// Inspired by https://www.paradigm.xyz/2021/07/twamm
// https://github.com/para-dave/twamm
// Frax Finance: https://github.com/FraxFinance
// Primary Author(s)
// Rich Gee: https://github.com/zer0blockchain
// Dennis: https://github.com/denett
// Reviewer(s) / Contributor(s)
// Travis Moore: https://github.com/FortisFortuna
// Sam Kazemian: https://github.com/samkazemian
interface IFraxswapPair is IUniswapV2PairV5 {
// TWAMM
event LongTermSwap0To1(address indexed addr, uint256 orderId, uint256 amount0In, uint256 numberOfTimeIntervals);
event LongTermSwap1To0(address indexed addr, uint256 orderId, uint256 amount1In, uint256 numberOfTimeIntervals);
event CancelLongTermOrder(address indexed addr, uint256 orderId, address sellToken, uint256 unsoldAmount, address buyToken, uint256 purchasedAmount);
event WithdrawProceedsFromLongTermOrder(address indexed addr, uint256 orderId, address indexed proceedToken, uint256 proceeds, bool orderExpired);
function fee() external view returns (uint);
function longTermSwapFrom0To1(uint256 amount0In, uint256 numberOfTimeIntervals) external returns (uint256 orderId);
function longTermSwapFrom1To0(uint256 amount1In, uint256 numberOfTimeIntervals) external returns (uint256 orderId);
function cancelLongTermSwap(uint256 orderId) external;
function withdrawProceedsFromLongTermSwap(uint256 orderId) external returns (bool is_expired, address rewardTkn, uint256 totalReward);
function executeVirtualOrders(uint256 blockTimestamp) external;
function getAmountOut(uint amountIn, address tokenIn) external view returns (uint);
function getAmountIn(uint amountOut, address tokenOut) external view returns (uint);
function orderTimeInterval() external returns (uint256);
function getTWAPHistoryLength() external view returns (uint);
function getTwammReserves() external view returns (uint112 _reserve0, uint112 _reserve1, uint32 _blockTimestampLast, uint112 _twammReserve0, uint112 _twammReserve1, uint256 _fee);
function getReserveAfterTwamm(uint256 blockTimestamp) external view returns (uint112 _reserve0, uint112 _reserve1, uint256 lastVirtualOrderTimestamp, uint112 _twammReserve0, uint112 _twammReserve1);
function getNextOrderID() external view returns (uint256);
function getOrderIDsForUser(address user) external view returns (uint256[] memory);
function getOrderIDsForUserLength(address user) external view returns (uint256);
// function getDetailedOrdersForUser(address user, uint256 offset, uint256 limit) external view returns (LongTermOrdersLib.Order[] memory detailed_orders);
function twammUpToDate() external view returns (bool);
function getTwammState() external view returns (uint256 token0Rate, uint256 token1Rate, uint256 lastVirtualOrderTimestamp, uint256 orderTimeInterval_rtn, uint256 rewardFactorPool0, uint256 rewardFactorPool1);
function getTwammSalesRateEnding(uint256 _blockTimestamp) external view returns (uint256 orderPool0SalesRateEnding, uint256 orderPool1SalesRateEnding);
function getTwammRewardFactor(uint256 _blockTimestamp) external view returns (uint256 rewardFactorPool0AtTimestamp, uint256 rewardFactorPool1AtTimestamp);
function getTwammOrder(uint256 orderId) external view returns (uint256 id, uint256 creationTimestamp, uint256 expirationTimestamp, uint256 saleRate, address owner, address sellTokenAddr, address buyTokenAddr);
function getTwammOrderProceedsView(uint256 orderId, uint256 blockTimestamp) external view returns (bool orderExpired, uint256 totalReward);
function getTwammOrderProceeds(uint256 orderId) external returns (bool orderExpired, uint256 totalReward);
function togglePauseNewSwaps() external;
}
// File contracts/Fraxswap/libraries/TransferHelper.sol
// helper methods for interacting with ERC20 tokens and sending ETH that do not consistently return true/false
library TransferHelper {
function safeApprove(
address token,
address to,
uint256 value
) internal {
// bytes4(keccak256(bytes('approve(address,uint256)')));
(bool success, bytes memory data) = token.call(abi.encodeWithSelector(0x095ea7b3, to, value));
require(
success && (data.length == 0 || abi.decode(data, (bool))),
'TransferHelper::safeApprove: approve failed'
);
}
function safeTransfer(
address token,
address to,
uint256 value
) internal {
// bytes4(keccak256(bytes('transfer(address,uint256)')));
(bool success, bytes memory data) = token.call(abi.encodeWithSelector(0xa9059cbb, to, value));
require(
success && (data.length == 0 || abi.decode(data, (bool))),
'TransferHelper::safeTransfer: transfer failed'
);
}
function safeTransferFrom(
address token,
address from,
address to,
uint256 value
) internal {
// bytes4(keccak256(bytes('transferFrom(address,address,uint256)')));
(bool success, bytes memory data) = token.call(abi.encodeWithSelector(0x23b872dd, from, to, value));
require(
success && (data.length == 0 || abi.decode(data, (bool))),
'TransferHelper::transferFrom: transferFrom failed'
);
}
function safeTransferETH(address to, uint256 value) internal {
(bool success, ) = to.call{value: value}(new bytes(0));
require(success, 'TransferHelper::safeTransferETH: ETH transfer failed');
}
}
// File contracts/Fraxswap/periphery/interfaces/IUniswapV2Router01V5.sol
interface IUniswapV2Router01V5 {
function factory() external view returns (address);
function WETH() external view returns (address);
function addLiquidity(
address tokenA,
address tokenB,
uint amountADesired,
uint amountBDesired,
uint amountAMin,
uint amountBMin,
address to,
uint deadline
) external returns (uint amountA, uint amountB, uint liquidity);
function addLiquidityETH(
address token,
uint amountTokenDesired,
uint amountTokenMin,
uint amountETHMin,
address to,
uint deadline
) external payable returns (uint amountToken, uint amountETH, uint liquidity);
function removeLiquidity(
address tokenA,
address tokenB,
uint liquidity,
uint amountAMin,
uint amountBMin,
address to,
uint deadline
) external returns (uint amountA, uint amountB);
function removeLiquidityETH(
address token,
uint liquidity,
uint amountTokenMin,
uint amountETHMin,
address to,
uint deadline
) external returns (uint amountToken, uint amountETH);
function removeLiquidityWithPermit(
address tokenA,
address tokenB,
uint liquidity,
uint amountAMin,
uint amountBMin,
address to,
uint deadline,
bool approveMax, uint8 v, bytes32 r, bytes32 s
) external returns (uint amountA, uint amountB);
function removeLiquidityETHWithPermit(
address token,
uint liquidity,
uint amountTokenMin,
uint amountETHMin,
address to,
uint deadline,
bool approveMax, uint8 v, bytes32 r, bytes32 s
) external returns (uint amountToken, uint amountETH);
function swapExactTokensForTokens(
uint amountIn,
uint amountOutMin,
address[] calldata path,
address to,
uint deadline
) external returns (uint[] memory amounts);
function swapTokensForExactTokens(
uint amountOut,
uint amountInMax,
address[] calldata path,
address to,
uint deadline
) external returns (uint[] memory amounts);
function swapExactETHForTokens(uint amountOutMin, address[] calldata path, address to, uint deadline)
external
payable
returns (uint[] memory amounts);
function swapTokensForExactETH(uint amountOut, uint amountInMax, address[] calldata path, address to, uint deadline)
external
returns (uint[] memory amounts);
function swapExactTokensForETH(uint amountIn, uint amountOutMin, address[] calldata path, address to, uint deadline)
external
returns (uint[] memory amounts);
function swapETHForExactTokens(uint amountOut, address[] calldata path, address to, uint deadline)
external
payable
returns (uint[] memory amounts);
function quote(uint amountA, uint reserveA, uint reserveB) external pure returns (uint amountB);
function getAmountOut(uint amountIn, uint reserveIn, uint reserveOut) external pure returns (uint amountOut);
function getAmountIn(uint amountOut, uint reserveIn, uint reserveOut) external pure returns (uint amountIn);
function getAmountsOut(uint amountIn, address[] calldata path) external view returns (uint[] memory amounts);
function getAmountsIn(uint amountOut, address[] calldata path) external view returns (uint[] memory amounts);
}
// File contracts/Fraxswap/periphery/interfaces/IUniswapV2Router02V5.sol
interface IUniswapV2Router02V5 is IUniswapV2Router01V5 {
function removeLiquidityETHSupportingFeeOnTransferTokens(
address token,
uint liquidity,
uint amountTokenMin,
uint amountETHMin,
address to,
uint deadline
) external returns (uint amountETH);
function removeLiquidityETHWithPermitSupportingFeeOnTransferTokens(
address token,
uint liquidity,
uint amountTokenMin,
uint amountETHMin,
address to,
uint deadline,
bool approveMax, uint8 v, bytes32 r, bytes32 s
) external returns (uint amountETH);
function swapExactTokensForTokensSupportingFeeOnTransferTokens(
uint amountIn,
uint amountOutMin,
address[] calldata path,
address to,
uint deadline
) external;
function swapExactETHForTokensSupportingFeeOnTransferTokens(
uint amountOutMin,
address[] calldata path,
address to,
uint deadline
) external payable;
function swapExactTokensForETHSupportingFeeOnTransferTokens(
uint amountIn,
uint amountOutMin,
address[] calldata path,
address to,
uint deadline
) external;
}
// File contracts/Fraxswap/periphery/libraries/FraxswapRouterLibrary.sol
// ====================================================================
// | ______ _______ |
// | / _____________ __ __ / ____(_____ ____ _____ ________ |
// | / /_ / ___/ __ `| |/_/ / /_ / / __ \/ __ `/ __ \/ ___/ _ \ |
// | / __/ / / / /_/ _> < / __/ / / / / / /_/ / / / / /__/ __/ |
// | /_/ /_/ \__,_/_/|_| /_/ /_/_/ /_/\__,_/_/ /_/\___/\___/ |
// | |
// ====================================================================
// ======================= FraxswapRouterLibrary ======================
// ====================================================================
// Fraxswap Router Library Functions
// Inspired by https://www.paradigm.xyz/2021/07/twamm
// https://github.com/para-dave/twamm
// Frax Finance: https://github.com/FraxFinance
// Primary Author(s)
// Rich Gee: https://github.com/zer0blockchain
// Dennis: https://github.com/denett
// Logic / Algorithm Ideas
// FrankieIsLost: https://github.com/FrankieIsLost
// Reviewer(s) / Contributor(s)
// Travis Moore: https://github.com/FortisFortuna
// Sam Kazemian: https://github.com/samkazemian
// Drake Evans: https://github.com/DrakeEvans
// Jack Corddry: https://github.com/corddry
// Justin Moore: https://github.com/0xJM
library FraxswapRouterLibrary {
// returns sorted token addresses, used to handle return values from pairs sorted in this order
function sortTokens(address tokenA, address tokenB) internal pure returns (address token0, address token1) {
require(tokenA != tokenB, 'FraxswapRouterLibrary: IDENTICAL_ADDRESSES');
(token0, token1) = tokenA < tokenB ? (tokenA, tokenB) : (tokenB, tokenA);
require(token0 != address(0), 'FraxswapRouterLibrary: ZERO_ADDRESS');
}
// calculates the CREATE2 address for a pair without making any external calls
function pairFor(address factory, address tokenA, address tokenB) internal pure returns (address pair) {
(address token0, address token1) = sortTokens(tokenA, tokenB);
pair = address(uint160(uint(keccak256(abi.encodePacked(
hex'ff',
factory,
keccak256(abi.encodePacked(token0, token1)),
hex'4ce0b4ab368f39e4bd03ec712dfc405eb5a36cdb0294b3887b441cd1c743ced3' // init code / init hash
)))));
}
// fetches and sorts the reserves for a pair
function getReserves(address factory, address tokenA, address tokenB) internal view returns (uint reserveA, uint reserveB) {
(address token0,) = sortTokens(tokenA, tokenB);
(uint reserve0, uint reserve1,) = IFraxswapPair(pairFor(factory, tokenA, tokenB)).getReserves();
(reserveA, reserveB) = tokenA == token0 ? (reserve0, reserve1) : (reserve1, reserve0);
}
function getReservesWithTwamm(address factory, address tokenA, address tokenB) internal returns (uint reserveA, uint reserveB, uint twammReserveA, uint twammReserveB) {
(address token0,) = sortTokens(tokenA, tokenB);
IFraxswapPair pair = IFraxswapPair(pairFor(factory, tokenA, tokenB));
pair.executeVirtualOrders(block.timestamp);
(uint reserve0, uint reserve1,,uint twammReserve0, uint twammReserve1, ) = pair.getTwammReserves();
(reserveA, reserveB, twammReserveA, twammReserveB) = tokenA == token0 ? (reserve0, reserve1, twammReserve0, twammReserve1) : (reserve1, reserve0, twammReserve1, twammReserve0);
}
// given some amount of an asset and pair reserves, returns an equivalent amount of the other asset
function quote(uint amountA, uint reserveA, uint reserveB) internal pure returns (uint amountB) {
require(amountA > 0, 'FraxswapRouterLibrary: INSUFFICIENT_AMOUNT');
require(reserveA > 0 && reserveB > 0, 'FraxswapRouterLibrary: INSUFFICIENT_LIQUIDITY');
amountB = amountA * reserveB / reserveA;
}
// performs chained getAmountOut calculations on any number of pairs
function getAmountsOut(address factory, uint amountIn, address[] memory path) internal view returns (uint[] memory amounts) {
require(path.length >= 2, 'FraxswapRouterLibrary: INVALID_PATH');
amounts = new uint[](path.length);
amounts[0] = amountIn;
for (uint i; i < path.length - 1; i++) {
IFraxswapPair pair = IFraxswapPair(FraxswapRouterLibrary.pairFor(factory, path[i], path[i + 1]));
require(pair.twammUpToDate(), 'twamm out of date');
amounts[i + 1] = pair.getAmountOut(amounts[i], path[i]);
}
}
// performs chained getAmountIn calculations on any number of pairs
function getAmountsIn(address factory, uint amountOut, address[] memory path) internal view returns (uint[] memory amounts) {
require(path.length >= 2, 'FraxswapRouterLibrary: INVALID_PATH');
amounts = new uint[](path.length);
amounts[amounts.length - 1] = amountOut;
for (uint i = path.length - 1; i > 0; i--) {
IFraxswapPair pair = IFraxswapPair(FraxswapRouterLibrary.pairFor(factory, path[i - 1], path[i]));
require(pair.twammUpToDate(), 'twamm out of date');
amounts[i - 1] = pair.getAmountIn(amounts[i], path[i - 1]);
}
}
// performs chained getAmountOut calculations on any number of pairs with Twamm
function getAmountsOutWithTwamm(address factory, uint amountIn, address[] memory path) internal returns (uint[] memory amounts) {
require(path.length >= 2, 'FraxswapRouterLibrary: INVALID_PATH');
amounts = new uint[](path.length);
amounts[0] = amountIn;
for (uint i; i < path.length - 1; i++) {
IFraxswapPair pair = IFraxswapPair(FraxswapRouterLibrary.pairFor(factory, path[i], path[i + 1]));
pair.executeVirtualOrders(block.timestamp);
amounts[i + 1] = pair.getAmountOut(amounts[i], path[i]);
}
}
// performs chained getAmountIn calculations on any number of pairs with Twamm
function getAmountsInWithTwamm(address factory, uint amountOut, address[] memory path) internal returns (uint[] memory amounts) {
require(path.length >= 2, 'FraxswapRouterLibrary: INVALID_PATH');
amounts = new uint[](path.length);
amounts[amounts.length - 1] = amountOut;
for (uint i = path.length - 1; i > 0; i--) {
IFraxswapPair pair = IFraxswapPair(FraxswapRouterLibrary.pairFor(factory, path[i - 1], path[i]));
pair.executeVirtualOrders(block.timestamp);
amounts[i - 1] = pair.getAmountIn(amounts[i], path[i - 1]);
}
}
}
// File contracts/Fraxswap/periphery/interfaces/IERC20.sol
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/Fraxswap/periphery/interfaces/IWETH.sol
interface IWETH {
function deposit() external payable;
function transfer(address to, uint value) external returns (bool);
function withdraw(uint) external;
}
// File contracts/Fraxswap/periphery/FraxswapRouter.sol
// ====================================================================
// | ______ _______ |
// | / _____________ __ __ / ____(_____ ____ _____ ________ |
// | / /_ / ___/ __ `| |/_/ / /_ / / __ \/ __ `/ __ \/ ___/ _ \ |
// | / __/ / / / /_/ _> < / __/ / / / / / /_/ / / / / /__/ __/ |
// | /_/ /_/ \__,_/_/|_| /_/ /_/_/ /_/\__,_/_/ /_/\___/\___/ |
// | |
// ====================================================================
// ========================== FraxswapRouter ==========================
// ====================================================================
// TWAMM Router
// Inspired by https://www.paradigm.xyz/2021/07/twamm
// https://github.com/para-dave/twamm
// Frax Finance: https://github.com/FraxFinance
// Primary Author(s)
// Rich Gee: https://github.com/zer0blockchain
// Dennis: https://github.com/denett
// Logic / Algorithm Ideas
// FrankieIsLost: https://github.com/FrankieIsLost
// Reviewer(s) / Contributor(s)
// Travis Moore: https://github.com/FortisFortuna
// Sam Kazemian: https://github.com/samkazemian
// Drake Evans: https://github.com/DrakeEvans
// Jack Corddry: https://github.com/corddry
// Justin Moore: https://github.com/0xJM
contract FraxswapRouter is IUniswapV2Router02V5 {
address public immutable override factory;
address public immutable override WETH;
modifier ensure(uint deadline) {
require(deadline >= block.timestamp, 'FraxswapV1Router: EXPIRED');
_;
}
constructor(address _factory, address _WETH) public {
factory = _factory;
WETH = _WETH;
}
receive() external payable {
assert(msg.sender == WETH); // only accept ETH via fallback from the WETH contract
}
// **** ADD LIQUIDITY ****
function _addLiquidity(
address tokenA,
address tokenB,
uint amountADesired,
uint amountBDesired,
uint amountAMin,
uint amountBMin
) internal virtual returns (uint amountA, uint amountB) {
// create the pair if it doesn't exist yet
if (IUniswapV2FactoryV5(factory).getPair(tokenA, tokenB) == address(0)) {
IUniswapV2FactoryV5(factory).createPair(tokenA, tokenB);
}
(uint reserveA, uint reserveB,,) = FraxswapRouterLibrary.getReservesWithTwamm(factory, tokenA, tokenB);
if (reserveA == 0 && reserveB == 0) {
(amountA, amountB) = (amountADesired, amountBDesired);
} else {
uint amountBOptimal = FraxswapRouterLibrary.quote(amountADesired, reserveA, reserveB);
if (amountBOptimal <= amountBDesired) {
require(amountBOptimal >= amountBMin, 'FraxswapV1Router: INSUFFICIENT_B_AMOUNT');
(amountA, amountB) = (amountADesired, amountBOptimal);
} else {
uint amountAOptimal = FraxswapRouterLibrary.quote(amountBDesired, reserveB, reserveA);
assert(amountAOptimal <= amountADesired);
require(amountAOptimal >= amountAMin, 'FraxswapV1Router: INSUFFICIENT_A_AMOUNT');
(amountA, amountB) = (amountAOptimal, amountBDesired);
}
}
}
function addLiquidity(
address tokenA,
address tokenB,
uint amountADesired,
uint amountBDesired,
uint amountAMin,
uint amountBMin,
address to,
uint deadline
) external virtual override ensure(deadline) returns (uint amountA, uint amountB, uint liquidity) {
(amountA, amountB) = _addLiquidity(tokenA, tokenB, amountADesired, amountBDesired, amountAMin, amountBMin);
address pair = FraxswapRouterLibrary.pairFor(factory, tokenA, tokenB);
TransferHelper.safeTransferFrom(tokenA, msg.sender, pair, amountA);
TransferHelper.safeTransferFrom(tokenB, msg.sender, pair, amountB);
liquidity = IFraxswapPair(pair).mint(to);
}
function addLiquidityETH(
address token,
uint amountTokenDesired,
uint amountTokenMin,
uint amountETHMin,
address to,
uint deadline
) external virtual override payable ensure(deadline) returns (uint amountToken, uint amountETH, uint liquidity) {
(amountToken, amountETH) = _addLiquidity(
token,
WETH,
amountTokenDesired,
msg.value,
amountTokenMin,
amountETHMin
);
address pair = FraxswapRouterLibrary.pairFor(factory, token, WETH);
TransferHelper.safeTransferFrom(token, msg.sender, pair, amountToken);
IWETH(WETH).deposit{value: amountETH}();
assert(IWETH(WETH).transfer(pair, amountETH));
liquidity = IFraxswapPair(pair).mint(to);
// refund dust eth, if any
if (msg.value > amountETH) TransferHelper.safeTransferETH(msg.sender, msg.value - amountETH);
}
// **** REMOVE LIQUIDITY ****
function removeLiquidity(
address tokenA,
address tokenB,
uint liquidity,
uint amountAMin,
uint amountBMin,
address to,
uint deadline
) public virtual override ensure(deadline) returns (uint amountA, uint amountB) {
address pair = FraxswapRouterLibrary.pairFor(factory, tokenA, tokenB);
IFraxswapPair(pair).transferFrom(msg.sender, pair, liquidity); // send liquidity to pair
(uint amount0, uint amount1) = IFraxswapPair(pair).burn(to);
(address token0,) = FraxswapRouterLibrary.sortTokens(tokenA, tokenB);
(amountA, amountB) = tokenA == token0 ? (amount0, amount1) : (amount1, amount0);
require(amountA >= amountAMin, 'FraxswapV1Router: INSUFFICIENT_A_AMOUNT');
require(amountB >= amountBMin, 'FraxswapV1Router: INSUFFICIENT_B_AMOUNT');
}
function removeLiquidityETH(
address token,
uint liquidity,
uint amountTokenMin,
uint amountETHMin,
address to,
uint deadline
) public virtual override ensure(deadline) returns (uint amountToken, uint amountETH) {
(amountToken, amountETH) = removeLiquidity(
token,
WETH,
liquidity,
amountTokenMin,
amountETHMin,
address(this),
deadline
);
TransferHelper.safeTransfer(token, to, amountToken);
IWETH(WETH).withdraw(amountETH);
TransferHelper.safeTransferETH(to, amountETH);
}
function removeLiquidityWithPermit(
address tokenA,
address tokenB,
uint liquidity,
uint amountAMin,
uint amountBMin,
address to,
uint deadline,
bool approveMax, uint8 v, bytes32 r, bytes32 s
) external virtual override returns (uint amountA, uint amountB) {
address pair = FraxswapRouterLibrary.pairFor(factory, tokenA, tokenB);
uint value = approveMax ? type(uint).max : liquidity;
IFraxswapPair(pair).permit(msg.sender, address(this), value, deadline, v, r, s);
(amountA, amountB) = removeLiquidity(tokenA, tokenB, liquidity, amountAMin, amountBMin, to, deadline);
}
function removeLiquidityETHWithPermit(
address token,
uint liquidity,
uint amountTokenMin,
uint amountETHMin,
address to,
uint deadline,
bool approveMax, uint8 v, bytes32 r, bytes32 s
) external virtual override returns (uint amountToken, uint amountETH) {
address pair = FraxswapRouterLibrary.pairFor(factory, token, WETH);
uint value = approveMax ? type(uint).max : liquidity;
IFraxswapPair(pair).permit(msg.sender, address(this), value, deadline, v, r, s);
(amountToken, amountETH) = removeLiquidityETH(token, liquidity, amountTokenMin, amountETHMin, to, deadline);
}
// **** REMOVE LIQUIDITY (supporting fee-on-transfer tokens) ****
function removeLiquidityETHSupportingFeeOnTransferTokens(
address token,
uint liquidity,
uint amountTokenMin,
uint amountETHMin,
address to,
uint deadline
) public virtual override ensure(deadline) returns (uint amountETH) {
(, amountETH) = removeLiquidity(
token,
WETH,
liquidity,
amountTokenMin,
amountETHMin,
address(this),
deadline
);
TransferHelper.safeTransfer(token, to, IERC20(token).balanceOf(address(this)));
IWETH(WETH).withdraw(amountETH);
TransferHelper.safeTransferETH(to, amountETH);
}
function removeLiquidityETHWithPermitSupportingFeeOnTransferTokens(
address token,
uint liquidity,
uint amountTokenMin,
uint amountETHMin,
address to,
uint deadline,
bool approveMax, uint8 v, bytes32 r, bytes32 s
) external virtual override returns (uint amountETH) {
address pair = FraxswapRouterLibrary.pairFor(factory, token, WETH);
uint value = approveMax ? type(uint).max : liquidity;
IFraxswapPair(pair).permit(msg.sender, address(this), value, deadline, v, r, s);
amountETH = removeLiquidityETHSupportingFeeOnTransferTokens(
token, liquidity, amountTokenMin, amountETHMin, to, deadline
);
}
// **** SWAP ****
// requires the initial amount to have already been sent to the first pair
function _swap(uint[] memory amounts, address[] memory path, address _to) internal virtual {
for (uint i; i < path.length - 1; i++) {
(address input, address output) = (path[i], path[i + 1]);
(address token0,) = FraxswapRouterLibrary.sortTokens(input, output);
uint amountOut = amounts[i + 1];
(uint amount0Out, uint amount1Out) = input == token0 ? (uint(0), amountOut) : (amountOut, uint(0));
address to = i < path.length - 2 ? FraxswapRouterLibrary.pairFor(factory, output, path[i + 2]) : _to;
IFraxswapPair(FraxswapRouterLibrary.pairFor(factory, input, output)).swap(
amount0Out, amount1Out, to, new bytes(0)
);
}
}
function swapExactTokensForTokens(
uint amountIn,
uint amountOutMin,
address[] calldata path,
address to,
uint deadline
) external virtual override ensure(deadline) returns (uint[] memory amounts) {
amounts = FraxswapRouterLibrary.getAmountsOutWithTwamm(factory, amountIn, path);
require(amounts[amounts.length - 1] >= amountOutMin, 'FraxswapV1Router: INSUFFICIENT_OUTPUT_AMOUNT');
TransferHelper.safeTransferFrom(
path[0], msg.sender, FraxswapRouterLibrary.pairFor(factory, path[0], path[1]), amounts[0]
);
_swap(amounts, path, to);
}
function swapTokensForExactTokens(
uint amountOut,
uint amountInMax,
address[] calldata path,
address to,
uint deadline
) external virtual override ensure(deadline) returns (uint[] memory amounts) {
amounts = FraxswapRouterLibrary.getAmountsInWithTwamm(factory, amountOut, path);
require(amounts[0] <= amountInMax, 'FraxswapV1Router: EXCESSIVE_INPUT_AMOUNT');
TransferHelper.safeTransferFrom(
path[0], msg.sender, FraxswapRouterLibrary.pairFor(factory, path[0], path[1]), amounts[0]
);
_swap(amounts, path, to);
}
function swapExactETHForTokens(uint amountOutMin, address[] calldata path, address to, uint deadline)
external
virtual
override
payable
ensure(deadline)
returns (uint[] memory amounts)
{
require(path[0] == WETH, 'FraxswapV1Router: INVALID_PATH');
amounts = FraxswapRouterLibrary.getAmountsOutWithTwamm(factory, msg.value, path);
require(amounts[amounts.length - 1] >= amountOutMin, 'FraxswapV1Router: INSUFFICIENT_OUTPUT_AMOUNT');
IWETH(WETH).deposit{value: amounts[0]}();
assert(IWETH(WETH).transfer(FraxswapRouterLibrary.pairFor(factory, path[0], path[1]), amounts[0]));
_swap(amounts, path, to);
}
function swapTokensForExactETH(uint amountOut, uint amountInMax, address[] calldata path, address to, uint deadline)
external
virtual
override
ensure(deadline)
returns (uint[] memory amounts)
{
require(path[path.length - 1] == WETH, 'FraxswapV1Router: INVALID_PATH');
amounts = FraxswapRouterLibrary.getAmountsInWithTwamm(factory, amountOut, path);
require(amounts[0] <= amountInMax, 'FraxswapV1Router: EXCESSIVE_INPUT_AMOUNT');
TransferHelper.safeTransferFrom(
path[0], msg.sender, FraxswapRouterLibrary.pairFor(factory, path[0], path[1]), amounts[0]
);
_swap(amounts, path, address(this));
IWETH(WETH).withdraw(amounts[amounts.length - 1]);
TransferHelper.safeTransferETH(to, amounts[amounts.length - 1]);
}
function swapExactTokensForETH(uint amountIn, uint amountOutMin, address[] calldata path, address to, uint deadline)
external
virtual
override
ensure(deadline)
returns (uint[] memory amounts)
{
require(path[path.length - 1] == WETH, 'FraxswapV1Router: INVALID_PATH');
amounts = FraxswapRouterLibrary.getAmountsOutWithTwamm(factory, amountIn, path);
require(amounts[amounts.length - 1] >= amountOutMin, 'FraxswapV1Router: INSUFFICIENT_OUTPUT_AMOUNT');
TransferHelper.safeTransferFrom(
path[0], msg.sender, FraxswapRouterLibrary.pairFor(factory, path[0], path[1]), amounts[0]
);
_swap(amounts, path, address(this));
IWETH(WETH).withdraw(amounts[amounts.length - 1]);
TransferHelper.safeTransferETH(to, amounts[amounts.length - 1]);
}
function swapETHForExactTokens(uint amountOut, address[] calldata path, address to, uint deadline)
external
virtual
override
payable
ensure(deadline)
returns (uint[] memory amounts)
{
require(path[0] == WETH, 'FraxswapV1Router: INVALID_PATH');
amounts = FraxswapRouterLibrary.getAmountsInWithTwamm(factory, amountOut, path);
require(amounts[0] <= msg.value, 'FraxswapV1Router: EXCESSIVE_INPUT_AMOUNT');
IWETH(WETH).deposit{value: amounts[0]}();
assert(IWETH(WETH).transfer(FraxswapRouterLibrary.pairFor(factory, path[0], path[1]), amounts[0]));
_swap(amounts, path, to);
// refund dust eth, if any
if (msg.value > amounts[0]) TransferHelper.safeTransferETH(msg.sender, msg.value - amounts[0]);
}
// **** SWAP (supporting fee-on-transfer tokens) ****
// requires the initial amount to have already been sent to the first pair
function _swapSupportingFeeOnTransferTokens(address[] memory path, address _to) internal virtual {
for (uint i; i < path.length - 1; i++) {
(address input, address output) = (path[i], path[i + 1]);
(address token0,) = FraxswapRouterLibrary.sortTokens(input, output);
IFraxswapPair pair = IFraxswapPair(FraxswapRouterLibrary.pairFor(factory, input, output));
uint amountInput;
uint amountOutput;
{ // scope to avoid stack too deep errors
(uint reserveInput, uint reserveOutput, uint twammReserveInput, uint twammReserveOutput) = FraxswapRouterLibrary.getReservesWithTwamm(factory, input, output);
amountInput = IERC20(input).balanceOf(address(pair)) - reserveInput - twammReserveInput;
amountOutput = pair.getAmountOut(amountInput, input);
}
(uint amount0Out, uint amount1Out) = input == token0 ? (uint(0), amountOutput) : (amountOutput, uint(0));
address to = i < path.length - 2 ? FraxswapRouterLibrary.pairFor(factory, output, path[i + 2]) : _to;
pair.swap(amount0Out, amount1Out, to, new bytes(0));
}
}
function swapExactTokensForTokensSupportingFeeOnTransferTokens(
uint amountIn,
uint amountOutMin,
address[] calldata path,
address to,
uint deadline
) external virtual override ensure(deadline) {
TransferHelper.safeTransferFrom(
path[0], msg.sender, FraxswapRouterLibrary.pairFor(factory, path[0], path[1]), amountIn
);
uint balanceBefore = IERC20(path[path.length - 1]).balanceOf(to);
_swapSupportingFeeOnTransferTokens(path, to);
require(
IERC20(path[path.length - 1]).balanceOf(to) - balanceBefore >= amountOutMin,
'FraxswapV1Router: INSUFFICIENT_OUTPUT_AMOUNT'
);
}
function swapExactETHForTokensSupportingFeeOnTransferTokens(
uint amountOutMin,
address[] calldata path,
address to,
uint deadline
)
external
virtual
override
payable
ensure(deadline)
{
require(path[0] == WETH, 'FraxswapV1Router: INVALID_PATH');
uint amountIn = msg.value;
IWETH(WETH).deposit{value: amountIn}();
assert(IWETH(WETH).transfer(FraxswapRouterLibrary.pairFor(factory, path[0], path[1]), amountIn));
uint balanceBefore = IERC20(path[path.length - 1]).balanceOf(to);
_swapSupportingFeeOnTransferTokens(path, to);
require(
IERC20(path[path.length - 1]).balanceOf(to) - balanceBefore >= amountOutMin,
'FraxswapV1Router: INSUFFICIENT_OUTPUT_AMOUNT'
);
}
function swapExactTokensForETHSupportingFeeOnTransferTokens(
uint amountIn,
uint amountOutMin,
address[] calldata path,
address to,
uint deadline
)
external
virtual
override
ensure(deadline)
{
require(path[path.length - 1] == WETH, 'FraxswapV1Router: INVALID_PATH');
TransferHelper.safeTransferFrom(
path[0], msg.sender, FraxswapRouterLibrary.pairFor(factory, path[0], path[1]), amountIn
);
_swapSupportingFeeOnTransferTokens(path, address(this));
uint amountOut = IERC20(WETH).balanceOf(address(this));
require(amountOut >= amountOutMin, 'FraxswapV1Router: INSUFFICIENT_OUTPUT_AMOUNT');
IWETH(WETH).withdraw(amountOut);
TransferHelper.safeTransferETH(to, amountOut);
}
// **** LIBRARY FUNCTIONS ****
function quote(uint amountA, uint reserveA, uint reserveB) public pure virtual override returns (uint amountB) {
return FraxswapRouterLibrary.quote(amountA, reserveA, reserveB);
}
function getAmountOut(uint amountIn, uint reserveIn, uint reserveOut)
public
pure
virtual
override
returns (uint amountOut)
{
revert("Deprecated: Use getAmountsOut"); // depends on the fee of the pool
}
function getAmountIn(uint amountOut, uint reserveIn, uint reserveOut)
public
pure
virtual
override
returns (uint amountIn)
{
revert("Deprecated: Use getAmountsIn"); // depends on the fee of the pool
}
function getAmountsOut(uint amountIn, address[] memory path)
public
view
virtual
override
returns (uint[] memory amounts)
{
return FraxswapRouterLibrary.getAmountsOut(factory, amountIn, path);
}
function getAmountsIn(uint amountOut, address[] memory path)
public
view
virtual
override
returns (uint[] memory amounts)
{
return FraxswapRouterLibrary.getAmountsIn(factory, amountOut, path);
}
function getAmountsOutWithTwamm(uint amountIn, address[] memory path)
public
returns (uint[] memory amounts)
{
return FraxswapRouterLibrary.getAmountsOutWithTwamm(factory, amountIn, path);
}
function getAmountsInWithTwamm(uint amountOut, address[] memory path)
public
returns (uint[] memory amounts)
{
return FraxswapRouterLibrary.getAmountsInWithTwamm(factory, amountOut, path);
}
}
Read Contract
WETH 0xad5c4648 → address
factory 0xc45a0155 → address
getAmountIn 0x85f8c259 → uint256
getAmountOut 0x054d50d4 → uint256
getAmountsIn 0x1f00ca74 → uint256[]
getAmountsOut 0xd06ca61f → uint256[]
quote 0xad615dec → uint256
Write Contract 19 functions
These functions modify contract state and require a wallet transaction to execute.
addLiquidity 0xe8e33700
address tokenA
address tokenB
uint256 amountADesired
uint256 amountBDesired
uint256 amountAMin
uint256 amountBMin
address to
uint256 deadline
returns: uint256, uint256, uint256
addLiquidityETH 0xf305d719
address token
uint256 amountTokenDesired
uint256 amountTokenMin
uint256 amountETHMin
address to
uint256 deadline
returns: uint256, uint256, uint256
getAmountsInWithTwamm 0xb66caf06
uint256 amountOut
address[] path
returns: uint256[]
getAmountsOutWithTwamm 0x704c32cf
uint256 amountIn
address[] path
returns: uint256[]
removeLiquidity 0xbaa2abde
address tokenA
address tokenB
uint256 liquidity
uint256 amountAMin
uint256 amountBMin
address to
uint256 deadline
returns: uint256, uint256
removeLiquidityETH 0x02751cec
address token
uint256 liquidity
uint256 amountTokenMin
uint256 amountETHMin
address to
uint256 deadline
returns: uint256, uint256
removeLiquidityETHSupportingFeeOnTransferTokens 0xaf2979eb
address token
uint256 liquidity
uint256 amountTokenMin
uint256 amountETHMin
address to
uint256 deadline
returns: uint256
removeLiquidityETHWithPermit 0xded9382a
address token
uint256 liquidity
uint256 amountTokenMin
uint256 amountETHMin
address to
uint256 deadline
bool approveMax
uint8 v
bytes32 r
bytes32 s
returns: uint256, uint256
removeLiquidityETHWithPermitSupportingFeeOnTransferTokens 0x5b0d5984
address token
uint256 liquidity
uint256 amountTokenMin
uint256 amountETHMin
address to
uint256 deadline
bool approveMax
uint8 v
bytes32 r
bytes32 s
returns: uint256
removeLiquidityWithPermit 0x2195995c
address tokenA
address tokenB
uint256 liquidity
uint256 amountAMin
uint256 amountBMin
address to
uint256 deadline
bool approveMax
uint8 v
bytes32 r
bytes32 s
returns: uint256, uint256
swapETHForExactTokens 0xfb3bdb41
uint256 amountOut
address[] path
address to
uint256 deadline
returns: uint256[]
swapExactETHForTokens 0x7ff36ab5
uint256 amountOutMin
address[] path
address to
uint256 deadline
returns: uint256[]
swapExactETHForTokensSupportingFeeOnTransferTokens 0xb6f9de95
uint256 amountOutMin
address[] path
address to
uint256 deadline
swapExactTokensForETH 0x18cbafe5
uint256 amountIn
uint256 amountOutMin
address[] path
address to
uint256 deadline
returns: uint256[]
swapExactTokensForETHSupportingFeeOnTransferTokens 0x791ac947
uint256 amountIn
uint256 amountOutMin
address[] path
address to
uint256 deadline
swapExactTokensForTokens 0x38ed1739
uint256 amountIn
uint256 amountOutMin
address[] path
address to
uint256 deadline
returns: uint256[]
swapExactTokensForTokensSupportingFeeOnTransferTokens 0x5c11d795
uint256 amountIn
uint256 amountOutMin
address[] path
address to
uint256 deadline
swapTokensForExactETH 0x4a25d94a
uint256 amountOut
uint256 amountInMax
address[] path
address to
uint256 deadline
returns: uint256[]
swapTokensForExactTokens 0x8803dbee
uint256 amountOut
uint256 amountInMax
address[] path
address to
uint256 deadline
returns: uint256[]
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