Address Contract Verified
Address
0x39d1d8fcC5E6EEAf567Bce4e29B94fec956D3519
Balance
0 ETH
Nonce
1
Code Size
19758 bytes
Creator
0xfF790875...6859 at tx 0x5179216f...ecf3c8
Indexed Transactions
0
Contract Bytecode
19758 bytes
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Verified Source Code Full Match
Compiler: v0.6.6+commit.6c089d02
EVM: istanbul
Optimization: Yes (10000 runs)
SwapV2Router.sol 369 lines
pragma solidity =0.6.6;
import '@uniswap/v2-core/contracts/interfaces/IUniswapV2Factory.sol';
import '@uniswap/lib/contracts/libraries/TransferHelper.sol';
import './interfaces/ISwapV2Router.sol';
import './interfaces/IFewFactory.sol';
import './interfaces/IFewWrappedToken.sol';
import './libraries/SwapV2Library.sol';
import './libraries/SafeMath.sol';
import './interfaces/IERC20.sol';
import './interfaces/IWETH.sol';
contract SwapV2Router is ISwapV2Router {
using SafeMath for uint;
address public immutable override factory;
address public immutable override WETH;
address public immutable override fewFactory;
address public immutable override fwWETH;
modifier ensure(uint deadline) {
require(deadline >= block.timestamp, 'SwapV2Router: EXPIRED');
_;
}
constructor(address _factory, address _WETH, address _fewFactory, address _fwWETH) public {
factory = _factory;
WETH = _WETH;
fewFactory = _fewFactory;
fwWETH = _fwWETH;
}
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 (IUniswapV2Factory(factory).getPair(tokenA, tokenB) == address(0)) {
IUniswapV2Factory(factory).createPair(tokenA, tokenB);
}
(uint reserveA, uint reserveB) = SwapV2Library.getReserves(factory, tokenA, tokenB);
if (reserveA == 0 && reserveB == 0) {
(amountA, amountB) = (amountADesired, amountBDesired);
} else {
uint amountBOptimal = SwapV2Library.quote(amountADesired, reserveA, reserveB);
if (amountBOptimal <= amountBDesired) {
require(amountBOptimal >= amountBMin, 'SwapV2Router: INSUFFICIENT_B_AMOUNT');
(amountA, amountB) = (amountADesired, amountBOptimal);
} else {
uint amountAOptimal = SwapV2Library.quote(amountBDesired, reserveB, reserveA);
assert(amountAOptimal <= amountADesired);
require(amountAOptimal >= amountAMin, 'SwapV2Router: 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) {
// create the wrapped token if it doesn't exist yet
if (IFewFactory(fewFactory).getWrappedToken(tokenA) == address(0)) {
IFewFactory(fewFactory).createToken(tokenA);
}
if (IFewFactory(fewFactory).getWrappedToken(tokenB) == address(0)) {
IFewFactory(fewFactory).createToken(tokenB);
}
address wrappedTokenA = IFewFactory(fewFactory).getWrappedToken(tokenA);
address wrappedTokenB = IFewFactory(fewFactory).getWrappedToken(tokenB);
(amountA, amountB) = _addLiquidity(wrappedTokenA, wrappedTokenB, amountADesired, amountBDesired, amountAMin, amountBMin);
address pair = SwapV2Library.pairFor(factory, wrappedTokenA, wrappedTokenB);
TransferHelper.safeTransferFrom(tokenA, msg.sender, address(this), amountA);
TransferHelper.safeTransferFrom(tokenB, msg.sender, address(this), amountB);
TransferHelper.safeApprove(tokenA, wrappedTokenA, amountA);
TransferHelper.safeApprove(tokenB, wrappedTokenB, amountB);
IFewWrappedToken(wrappedTokenA).wrapTo(amountA, pair);
IFewWrappedToken(wrappedTokenB).wrapTo(amountB, pair);
liquidity = IUniswapV2Pair(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) {
// create the wrapped token if it doesn't exist yet
if (IFewFactory(fewFactory).getWrappedToken(token) == address(0)) {
IFewFactory(fewFactory).createToken(token);
}
address wrappedToken = IFewFactory(fewFactory).getWrappedToken(token);
(amountToken, amountETH) = _addLiquidity(
wrappedToken,
fwWETH,
amountTokenDesired,
msg.value,
amountTokenMin,
amountETHMin
);
address pair = SwapV2Library.pairFor(factory, wrappedToken, fwWETH);
TransferHelper.safeTransferFrom(token, msg.sender, address(this), amountToken);
IWETH(WETH).deposit{value: amountETH}();
TransferHelper.safeApprove(token, wrappedToken, amountToken);
TransferHelper.safeApprove(WETH, fwWETH, amountETH);
IFewWrappedToken(wrappedToken).wrapTo(amountToken, pair);
IFewWrappedToken(fwWETH).wrapTo(amountETH, pair);
liquidity = IUniswapV2Pair(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 = SwapV2Library.pairFor(factory, tokenA, tokenB);
IUniswapV2Pair(pair).transferFrom(msg.sender, pair, liquidity); // send liquidity to pair
(uint amount0, uint amount1) = IUniswapV2Pair(pair).burn(address(this));
(address token0,) = SwapV2Library.sortTokens(tokenA, tokenB);
(amountA, amountB) = tokenA == token0 ? (amount0, amount1) : (amount1, amount0);
require(amountA >= amountAMin, 'SwapV2Router: INSUFFICIENT_A_AMOUNT');
require(amountB >= amountBMin, 'SwapV2Router: INSUFFICIENT_B_AMOUNT');
IFewWrappedToken(tokenA).unwrapTo(amountA, to);
IFewWrappedToken(tokenB).unwrapTo(amountB, to);
}
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,
fwWETH,
liquidity,
amountTokenMin,
amountETHMin,
address(this),
deadline
);
TransferHelper.safeTransfer(IFewWrappedToken(token).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 = SwapV2Library.pairFor(factory, tokenA, tokenB);
uint value = approveMax ? uint(-1) : liquidity;
IUniswapV2Pair(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 = SwapV2Library.pairFor(factory, token, fwWETH);
uint value = approveMax ? uint(-1) : liquidity;
IUniswapV2Pair(pair).permit(msg.sender, address(this), value, deadline, v, r, s);
(amountToken, amountETH) = removeLiquidityETH(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,) = SwapV2Library.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 ? SwapV2Library.pairFor(factory, output, path[i + 2]) : _to;
IUniswapV2Pair(SwapV2Library.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 = SwapV2Library.getAmountsOut(factory, amountIn, path);
require(amounts[amounts.length - 1] >= amountOutMin, 'SwapV2Router: INSUFFICIENT_OUTPUT_AMOUNT');
address srcToken = IFewWrappedToken(path[0]).token();
TransferHelper.safeTransferFrom(srcToken, msg.sender, address(this), amounts[0]);
TransferHelper.safeApprove(srcToken, path[0], amounts[0]);
IFewWrappedToken(path[0]).wrapTo(amounts[0], SwapV2Library.pairFor(factory, path[0], path[1]));
_swap(amounts, path, address(this));
address dstWrappedToken = path[path.length - 1];
IFewWrappedToken(dstWrappedToken).unwrapTo(amounts[amounts.length - 1], to);
}
function swapTokensForExactTokens(
uint amountOut,
uint amountInMax,
address[] calldata path,
address to,
uint deadline
) external virtual override ensure(deadline) returns (uint[] memory amounts) {
amounts = SwapV2Library.getAmountsIn(factory, amountOut, path);
require(amounts[0] <= amountInMax, 'SwapV2Router: EXCESSIVE_INPUT_AMOUNT');
address srcToken = IFewWrappedToken(path[0]).token();
TransferHelper.safeTransferFrom(srcToken, msg.sender, address(this), amounts[0]);
TransferHelper.safeApprove(srcToken, path[0], amounts[0]);
IFewWrappedToken(path[0]).wrapTo(amounts[0], SwapV2Library.pairFor(factory, path[0], path[1]));
_swap(amounts, path, address(this));
address dstWrappedToken = path[path.length - 1];
IFewWrappedToken(dstWrappedToken).unwrapTo(amounts[amounts.length - 1], 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] == fwWETH, 'SwapV2Router: INVALID_PATH');
amounts = SwapV2Library.getAmountsOut(factory, msg.value, path);
require(amounts[amounts.length - 1] >= amountOutMin, 'SwapV2Router: INSUFFICIENT_OUTPUT_AMOUNT');
IWETH(WETH).deposit{value: amounts[0]}();
TransferHelper.safeApprove(WETH, fwWETH, amounts[0]);
IFewWrappedToken(fwWETH).wrapTo(amounts[0], SwapV2Library.pairFor(factory, path[0], path[1]));
_swap(amounts, path, address(this));
address dstWrappedToken = path[path.length - 1];
IFewWrappedToken(dstWrappedToken).unwrapTo(amounts[amounts.length - 1], 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] == fwWETH, 'SwapV2Router: INVALID_PATH');
amounts = SwapV2Library.getAmountsIn(factory, amountOut, path);
require(amounts[0] <= amountInMax, 'SwapV2Router: EXCESSIVE_INPUT_AMOUNT');
address srcToken = IFewWrappedToken(path[0]).token();
TransferHelper.safeTransferFrom(srcToken, msg.sender, address(this), amounts[0]);
TransferHelper.safeApprove(srcToken, path[0], amounts[0]);
IFewWrappedToken(path[0]).wrapTo(amounts[0], SwapV2Library.pairFor(factory, path[0], path[1]));
_swap(amounts, path, address(this));
IFewWrappedToken(fwWETH).unwrap(amounts[amounts.length - 1]);
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] == fwWETH, 'SwapV2Router: INVALID_PATH');
amounts = SwapV2Library.getAmountsOut(factory, amountIn, path);
require(amounts[amounts.length - 1] >= amountOutMin, 'SwapV2Router: INSUFFICIENT_OUTPUT_AMOUNT');
address srcToken = IFewWrappedToken(path[0]).token();
TransferHelper.safeTransferFrom(srcToken, msg.sender, address(this), amounts[0]);
TransferHelper.safeApprove(srcToken, path[0], amounts[0]);
IFewWrappedToken(path[0]).wrapTo(amounts[0], SwapV2Library.pairFor(factory, path[0], path[1]));
_swap(amounts, path, address(this));
IFewWrappedToken(fwWETH).unwrapTo(amounts[amounts.length - 1], 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] == fwWETH, 'SwapV2Router: INVALID_PATH');
amounts = SwapV2Library.getAmountsIn(factory, amountOut, path);
require(amounts[0] <= msg.value, 'SwapV2Router: EXCESSIVE_INPUT_AMOUNT');
IWETH(WETH).deposit{value: amounts[0]}();
TransferHelper.safeApprove(WETH, fwWETH, amounts[0]);
IFewWrappedToken(fwWETH).wrapTo(amounts[0], SwapV2Library.pairFor(factory, path[0], path[1]));
_swap(amounts, path, address(this));
address dstWrappedToken = path[path.length - 1];
IFewWrappedToken(dstWrappedToken).unwrapTo(amounts[amounts.length - 1], to);
// refund dust eth, if any
if (msg.value > amounts[0]) TransferHelper.safeTransferETH(msg.sender, msg.value - amounts[0]);
}
// **** LIBRARY FUNCTIONS ****
function quote(uint amountA, uint reserveA, uint reserveB) public pure virtual override returns (uint amountB) {
return SwapV2Library.quote(amountA, reserveA, reserveB);
}
function getAmountOut(uint amountIn, uint reserveIn, uint reserveOut)
public
pure
virtual
override
returns (uint amountOut)
{
return SwapV2Library.getAmountOut(amountIn, reserveIn, reserveOut);
}
function getAmountIn(uint amountOut, uint reserveIn, uint reserveOut)
public
pure
virtual
override
returns (uint amountIn)
{
return SwapV2Library.getAmountIn(amountOut, reserveIn, reserveOut);
}
function getAmountsOut(uint amountIn, address[] memory path)
public
view
virtual
override
returns (uint[] memory amounts)
{
return SwapV2Library.getAmountsOut(factory, amountIn, path);
}
function getAmountsIn(uint amountOut, address[] memory path)
public
view
virtual
override
returns (uint[] memory amounts)
{
return SwapV2Library.getAmountsIn(factory, amountOut, path);
}
}
IWETH.sol 7 lines
pragma solidity >=0.5.0;
interface IWETH {
function deposit() external payable;
function transfer(address to, uint value) external returns (bool);
function withdraw(uint) external;
}
IERC20.sol 17 lines
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);
}
SafeMath.sol 17 lines
pragma solidity =0.6.6;
// 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');
}
}
IFewERC20.sol 12 lines
// SPDX-License-Identifier: GPL-2.0-or-later
pragma solidity >=0.5.0;
import "./IERC20.sol";
interface IFewERC20 is IERC20 {
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;
}
IFewFactory.sol 13 lines
// SPDX-License-Identifier: GPL-2.0-or-later
pragma solidity >=0.5.0;
interface IFewFactory {
event WrappedTokenCreated(address indexed originalToken, address wrappedToken, uint);
function getWrappedToken(address originalToken) external view returns (address wrappedToken);
function allWrappedTokens(uint) external view returns (address wrappedToken);
function parameter() external view returns (address);
function allWrappedTokensLength() external view returns (uint);
function paused() external view returns (bool);
function createToken(address originalToken) external returns (address wrappedToken);
}
SwapV2Library.sol 82 lines
pragma solidity >=0.5.0;
import '@uniswap/v2-core/contracts/interfaces/IUniswapV2Pair.sol';
import "./SafeMath.sol";
library SwapV2Library {
using SafeMath for uint;
// 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, 'SwapV2Library: IDENTICAL_ADDRESSES');
(token0, token1) = tokenA < tokenB ? (tokenA, tokenB) : (tokenB, tokenA);
require(token0 != address(0), 'SwapV2Library: 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(uint(keccak256(abi.encodePacked(
hex'ff',
factory,
keccak256(abi.encodePacked(token0, token1)),
hex'a7ae6a5ec37f0c21bbdac560794258c4089b8ae3ffa6e3909b53c6091764a676' // init code 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,) = IUniswapV2Pair(pairFor(factory, tokenA, tokenB)).getReserves();
(reserveA, reserveB) = tokenA == token0 ? (reserve0, reserve1) : (reserve1, reserve0);
}
// 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, 'SwapV2Library: INSUFFICIENT_AMOUNT');
require(reserveA > 0 && reserveB > 0, 'SwapV2Library: INSUFFICIENT_LIQUIDITY');
amountB = amountA.mul(reserveB) / reserveA;
}
// given an input amount of an asset and pair reserves, returns the maximum output amount of the other asset
function getAmountOut(uint amountIn, uint reserveIn, uint reserveOut) internal pure returns (uint amountOut) {
require(amountIn > 0, 'SwapV2Library: INSUFFICIENT_INPUT_AMOUNT');
require(reserveIn > 0 && reserveOut > 0, 'SwapV2Library: INSUFFICIENT_LIQUIDITY');
uint amountInWithFee = amountIn.mul(997);
uint numerator = amountInWithFee.mul(reserveOut);
uint denominator = reserveIn.mul(1000).add(amountInWithFee);
amountOut = numerator / denominator;
}
// given an output amount of an asset and pair reserves, returns a required input amount of the other asset
function getAmountIn(uint amountOut, uint reserveIn, uint reserveOut) internal pure returns (uint amountIn) {
require(amountOut > 0, 'SwapV2Library: INSUFFICIENT_OUTPUT_AMOUNT');
require(reserveIn > 0 && reserveOut > 0, 'SwapV2Library: INSUFFICIENT_LIQUIDITY');
uint numerator = reserveIn.mul(amountOut).mul(1000);
uint denominator = reserveOut.sub(amountOut).mul(997);
amountIn = (numerator / denominator).add(1);
}
// 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, 'SwapV2Library: INVALID_PATH');
amounts = new uint[](path.length);
amounts[0] = amountIn;
for (uint i; i < path.length - 1; i++) {
(uint reserveIn, uint reserveOut) = getReserves(factory, path[i], path[i + 1]);
amounts[i + 1] = getAmountOut(amounts[i], reserveIn, reserveOut);
}
}
// 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, 'SwapV2Library: INVALID_PATH');
amounts = new uint[](path.length);
amounts[amounts.length - 1] = amountOut;
for (uint i = path.length - 1; i > 0; i--) {
(uint reserveIn, uint reserveOut) = getReserves(factory, path[i - 1], path[i]);
amounts[i - 1] = getAmountIn(amounts[i], reserveIn, reserveOut);
}
}
}
ISwapV2Router.sol 8 lines
pragma solidity >=0.6.2;
import './IUniswapV2Router01.sol';
interface ISwapV2Router is IUniswapV2Router01 {
function fewFactory() external pure returns (address);
function fwWETH() external pure returns (address);
}
IFewWrappedToken.sol 22 lines
// SPDX-License-Identifier: GPL-2.0-or-later
pragma solidity >=0.5.0;
import "../interfaces/IFewERC20.sol";
interface IFewWrappedToken is IFewERC20 {
event Mint(address indexed minter, uint256 amount, address indexed to);
event Burn(address indexed burner, uint256 amount, address indexed to);
event Wrap(address indexed sender, uint256 amount, address indexed to);
event Unwrap(address indexed sender, uint256 amount, address indexed to);
function factory() external view returns (address);
function token() external view returns (address);
function burn(uint256 amount) external;
function burnFrom(address account, uint256 amount) external;
function mint(address account, uint256 amount) external;
function wrap(uint256 amount) external returns (uint256);
function wrapTo(uint256 amount, address to) external returns (uint256);
function unwrap(uint256 amount) external returns (uint256);
function unwrapTo(uint256 amount, address to) external returns (uint256);
}
IUniswapV2Router01.sol 11 lines
pragma solidity >=0.6.2;
import './IUniswapV2Router01Base.sol';
interface IUniswapV2Router01 is IUniswapV2Router01Base {
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);
}
IUniswapV2Router01Base.sol 89 lines
pragma solidity >=0.6.2;
interface IUniswapV2Router01Base {
function factory() external pure returns (address);
function WETH() external pure 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);
}
TransferHelper.sol 51 lines
// SPDX-License-Identifier: GPL-3.0-or-later
pragma solidity >=0.6.0;
// 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');
}
}
IUniswapV2Pair.sol 52 lines
pragma solidity >=0.5.0;
interface IUniswapV2Pair {
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;
}
IUniswapV2Factory.sol 17 lines
pragma solidity >=0.5.0;
interface IUniswapV2Factory {
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;
}
Read Contract
WETH 0xad5c4648 → address
factory 0xc45a0155 → address
fewFactory 0x293ba4df → address
fwWETH 0x7b9e6af4 → address
getAmountIn 0x85f8c259 → uint256
getAmountOut 0x054d50d4 → uint256
getAmountsIn 0x1f00ca74 → uint256[]
getAmountsOut 0xd06ca61f → uint256[]
quote 0xad615dec → uint256
Write Contract 12 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
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
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
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[]
swapExactTokensForETH 0x18cbafe5
uint256 amountIn
uint256 amountOutMin
address[] path
address to
uint256 deadline
returns: uint256[]
swapExactTokensForTokens 0x38ed1739
uint256 amountIn
uint256 amountOutMin
address[] path
address to
uint256 deadline
returns: uint256[]
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[]
Token Balances (2)
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