Contract Source Code:
// SPDX-License-Identifier: MIT
pragma solidity =0.8.17;
import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
import "@openzeppelin/contracts/utils/math/SafeMath.sol";
import "@uniswap/v2-core/contracts/interfaces/IUniswapV2Factory.sol";
import "@uniswap/v2-periphery/contracts/interfaces/IUniswapV2Router02.sol";
contract Metatate is Context, ERC20, Ownable {
using SafeMath for uint256;
IUniswapV2Router02 private _uniswapV2Router;
mapping (address => uint) private _cooldown;
mapping (address => bool) private _isExcludedFromFees;
mapping (address => bool) private _isExcludedMaxTransactionAmount;
mapping (address => bool) private _isBlacklisted;
bool public tradingOpen;
bool private _swapping;
bool public swapEnabled = false;
bool public cooldownEnabled = false;
bool public feesEnabled = true;
uint256 private constant _tSupply = 1e11 * (10**18);
uint256 public maxBuyAmount = _tSupply;
uint256 public maxSellAmount = _tSupply;
uint256 public maxWalletAmount = _tSupply;
uint256 public tradingOpenBlock = 0;
uint256 private _blocksToBlacklist = 0;
uint256 private _cooldownBlocks = 1;
uint256 public constant FEE_DIVISOR = 1000;
uint256 private _totalFees;
uint256 private _bbceFee;
uint256 private _opsFee;
uint256 private _devFee;
uint256 private _liqFee;
uint256 public buyBBCEFee = 30;
uint256 private _previousBuyBBCEFee = buyBBCEFee;
uint256 public buyOpsFee = 30;
uint256 private _previousBuyOpsFee = buyOpsFee;
uint256 public buyDevFee = 20;
uint256 private _previousBuyDevFee = buyDevFee;
uint256 public buyLiqFee = 10;
uint256 private _previousBuyLiqFee = buyLiqFee;
uint256 public sellBBCEFee = 30;
uint256 private _previousSellBBCEFee = sellBBCEFee;
uint256 public sellOpsFee = 30;
uint256 private _previousSellOpsFee = sellOpsFee;
uint256 public sellDevFee = 30;
uint256 private _previousSellDevFee = sellDevFee;
uint256 public sellLiqFee = 10;
uint256 private _previousSellLiqFee = sellLiqFee;
uint256 private _tokensForBBCE;
uint256 private _tokensForOps;
uint256 private _tokensForDev;
uint256 private _tokensForLiq;
uint256 private _swapTokensAtAmount = 0;
address payable private _bbCEWallet;
address payable private _opsWallet;
address payable private _devWallet1;
address payable private _devWallet2;
address payable private _liqWallet;
address private _uniswapV2Pair;
address constant private DEAD = 0x000000000000000000000000000000000000dEaD;
address constant private ZERO = 0x0000000000000000000000000000000000000000;
event OpenTrading(uint256 tradingOpenBlock, uint256 _blocksToBlacklist);
event SetMaxBuyAmount(uint256 newMaxBuyAmount);
event SetMaxSellAmount(uint256 newMaxSellAmount);
event SetMaxWalletAmount(uint256 newMaxWalletAmount);
event SetSwapTokensAtAmount(uint256 newSwapTokensAtAmount);
event SetBuyFee(uint256 buyBBCEFee, uint256 buyOpsFee, uint256 buyDevFee, uint256 buyLiqFee);
event SetSellFee(uint256 sellBBCEFee, uint256 sellOpsFee, uint256 sellDevFee, uint256 sellLiqFee);
constructor (address payable bbCEWallet, address payable opsWallet, address payable devWallet1, address payable devWallet2, address payable liqWallet) ERC20("Metatate", "CHI") {
require(bbCEWallet != ZERO, "bbCEWallet address cannot be 0");
require(opsWallet != ZERO, "opsWallet address cannot be 0");
require(devWallet1 != ZERO, "devWallet1 address cannot be 0");
require(devWallet2 != ZERO, "devWallet2 address cannot be 0");
require(liqWallet != ZERO, "liqWallet address cannot be 0");
_uniswapV2Router = IUniswapV2Router02(0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D);
_approve(address(this), address(_uniswapV2Router), _tSupply);
_uniswapV2Pair = IUniswapV2Factory(_uniswapV2Router.factory()).createPair(address(this), _uniswapV2Router.WETH());
IERC20(_uniswapV2Pair).approve(address(_uniswapV2Router), type(uint).max);
_bbCEWallet = bbCEWallet;
_opsWallet = opsWallet;
_devWallet1 = devWallet1;
_devWallet2 = devWallet2;
_liqWallet = liqWallet;
_isExcludedFromFees[owner()] = true;
_isExcludedFromFees[address(this)] = true;
_isExcludedFromFees[DEAD] = true;
_isExcludedFromFees[_bbCEWallet] = true;
_isExcludedFromFees[_opsWallet] = true;
_isExcludedFromFees[_devWallet1] = true;
_isExcludedFromFees[_devWallet2] = true;
_isExcludedFromFees[_liqWallet] = true;
_isExcludedMaxTransactionAmount[owner()] = true;
_isExcludedMaxTransactionAmount[address(this)] = true;
_isExcludedMaxTransactionAmount[DEAD] = true;
_isExcludedMaxTransactionAmount[_bbCEWallet] = true;
_isExcludedMaxTransactionAmount[_opsWallet] = true;
_isExcludedMaxTransactionAmount[_devWallet1] = true;
_isExcludedMaxTransactionAmount[_devWallet2] = true;
_isExcludedMaxTransactionAmount[_liqWallet] = true;
_mint(owner(), _tSupply);
}
function _transfer(address from, address to, uint256 amount) internal override {
require(from != ZERO, "ERC20: transfer from the zero address");
require(to != ZERO, "ERC20: transfer to the zero address");
require(amount > 0, "Transfer amount must be greater than zero");
bool takeFee = true;
bool shouldSwap = false;
if (from != owner() && to != owner() && to != ZERO && to != DEAD && !_swapping) {
require(!_isBlacklisted[from] && !_isBlacklisted[to], "Blacklisted.");
if(!tradingOpen) require(_isExcludedFromFees[from] || _isExcludedFromFees[to], "Trading is not allowed yet.");
if (cooldownEnabled) {
if (to != address(_uniswapV2Router) && to != address(_uniswapV2Pair)) {
require(_cooldown[tx.origin] < block.number - _cooldownBlocks && _cooldown[to] < block.number - _cooldownBlocks, "Transfer delay enabled. Try again later.");
_cooldown[tx.origin] = block.number;
_cooldown[to] = block.number;
}
}
if (from == _uniswapV2Pair && to != address(_uniswapV2Router) && !_isExcludedMaxTransactionAmount[to]) {
require(amount <= maxBuyAmount, "Transfer amount exceeds the maxBuyAmount.");
require(balanceOf(to) + amount <= maxWalletAmount, "Exceeds maximum wallet token amount.");
}
if (to == _uniswapV2Pair && from != address(_uniswapV2Router) && !_isExcludedMaxTransactionAmount[from]) {
require(amount <= maxSellAmount, "Transfer amount exceeds the maxSellAmount.");
shouldSwap = true;
}
}
if(_isExcludedFromFees[from] || _isExcludedFromFees[to] || !feesEnabled) takeFee = false;
uint256 contractTokenBalance = balanceOf(address(this));
bool canSwap = (contractTokenBalance > _swapTokensAtAmount) && shouldSwap;
if (canSwap && swapEnabled && !_swapping && !_isExcludedFromFees[from] && !_isExcludedFromFees[to]) {
_swapping = true;
swapBack();
_swapping = false;
}
_tokenTransfer(from, to, amount, takeFee, shouldSwap);
}
function swapBack() private {
uint256 contractBalance = balanceOf(address(this));
uint256 totalTokensToSwap = _tokensForBBCE.add(_tokensForOps).add(_tokensForDev).add(_tokensForLiq);
bool success;
if (contractBalance == 0 || totalTokensToSwap == 0) return;
if (contractBalance > _swapTokensAtAmount.mul(5)) contractBalance = _swapTokensAtAmount.mul(5);
uint256 liquidityTokens = contractBalance.mul(_tokensForLiq).div(totalTokensToSwap).div(2);
uint256 amountToSwapForETH = contractBalance.sub(liquidityTokens);
uint256 initialETHBalance = address(this).balance;
swapTokensForETH(amountToSwapForETH);
uint256 ethBalance = address(this).balance.sub(initialETHBalance);
uint256 ethForBBCE = ethBalance.mul(_tokensForBBCE).div(totalTokensToSwap);
uint256 ethForOps = ethBalance.mul(_tokensForOps).div(totalTokensToSwap);
uint256 ethForDev = ethBalance.mul(_tokensForDev).div(totalTokensToSwap);
uint256 ethForLiq = ethBalance.sub(ethForBBCE).sub(ethForOps).sub(ethForDev);
_tokensForBBCE = 0;
_tokensForOps = 0;
_tokensForDev = 0;
_tokensForLiq = 0;
if(liquidityTokens > 0 && ethForLiq > 0) _addLiquidity(liquidityTokens, ethForLiq);
(success,) = address(_bbCEWallet).call{value: ethForBBCE}("");
(success,) = address(_devWallet1).call{value: ethForDev.div(2)}("");
(success,) = address(_devWallet2).call{value: ethForDev.div(2)}("");
(success,) = address(_opsWallet).call{value: address(this).balance}("");
}
function swapTokensForETH(uint256 tokenAmount) private {
address[] memory path = new address[](2);
path[0] = address(this);
path[1] = _uniswapV2Router.WETH();
_approve(address(this), address(_uniswapV2Router), tokenAmount);
_uniswapV2Router.swapExactTokensForETHSupportingFeeOnTransferTokens(
tokenAmount,
0,
path,
address(this),
block.timestamp
);
}
function _addLiquidity(uint256 tokenAmount, uint256 ethAmount) internal {
_approve(address(this), address(_uniswapV2Router), tokenAmount);
_uniswapV2Router.addLiquidityETH{value: ethAmount}(
address(this),
tokenAmount,
0,
0,
_liqWallet,
block.timestamp
);
}
function sendETHToFee(uint256 amount) private {
_bbCEWallet.transfer(amount.div(4));
_opsWallet.transfer(amount.div(4));
_devWallet1.transfer(amount.div(4));
_devWallet2.transfer(amount.div(4));
}
function isBlacklisted(address wallet) external view returns (bool) {
return _isBlacklisted[wallet];
}
function openTrading(uint256 blocks) public onlyOwner() {
require(!tradingOpen, "Trading is already open");
swapEnabled = true;
cooldownEnabled = true;
maxSellAmount = _tSupply.mul(1).div(100);
_swapTokensAtAmount = _tSupply.mul(5).div(10000);
tradingOpen = true;
tradingOpenBlock = block.number;
_blocksToBlacklist = blocks;
emit OpenTrading(tradingOpenBlock, _blocksToBlacklist);
}
function setCooldownEnabled(bool onoff) public onlyOwner {
cooldownEnabled = onoff;
}
function setSwapEnabled(bool onoff) public onlyOwner {
swapEnabled = onoff;
}
function setFeesEnabled(bool onoff) public onlyOwner {
feesEnabled = onoff;
}
function setMaxBuyAmount(uint256 _maxBuyAmount) public onlyOwner {
require(_maxBuyAmount >= (totalSupply().mul(1).div(1000)), "Max buy amount cannot be lower than 0.1% total supply.");
maxBuyAmount = _maxBuyAmount;
emit SetMaxBuyAmount(maxBuyAmount);
}
function setMaxSellAmount(uint256 _maxSellAmount) public onlyOwner {
require(_maxSellAmount >= (totalSupply().mul(1).div(1000)), "Max sell amount cannot be lower than 0.1% total supply.");
maxSellAmount = _maxSellAmount;
emit SetMaxSellAmount(maxSellAmount);
}
function setMaxWalletAmount(uint256 _maxWalletAmount) public onlyOwner {
require(_maxWalletAmount >= (totalSupply().mul(1).div(1000)), "Max wallet amount cannot be lower than 0.1% total supply.");
maxWalletAmount = _maxWalletAmount;
emit SetMaxWalletAmount(maxWalletAmount);
}
function setSwapTokensAtAmount(uint256 swapTokensAtAmount) public onlyOwner {
require(swapTokensAtAmount >= (totalSupply().mul(1).div(100000)), "Swap amount cannot be lower than 0.001% total supply.");
require(swapTokensAtAmount <= (totalSupply().mul(5).div(1000)), "Swap amount cannot be higher than 0.5% total supply.");
_swapTokensAtAmount = swapTokensAtAmount;
emit SetSwapTokensAtAmount(_swapTokensAtAmount);
}
function setBBCEWallet(address bbCEWallet) public onlyOwner {
require(bbCEWallet != ZERO, "_bbCEWallet address cannot be 0");
_isExcludedFromFees[_bbCEWallet] = false;
_isExcludedMaxTransactionAmount[_bbCEWallet] = false;
_bbCEWallet = payable(bbCEWallet);
_isExcludedFromFees[_bbCEWallet] = true;
_isExcludedMaxTransactionAmount[_bbCEWallet] = true;
}
function setOpsWallet(address opsWallet) public onlyOwner {
require(opsWallet != ZERO, "_opsWallet address cannot be 0");
_isExcludedFromFees[_opsWallet] = false;
_isExcludedMaxTransactionAmount[_opsWallet] = false;
_opsWallet = payable(opsWallet);
_isExcludedFromFees[_opsWallet] = true;
_isExcludedMaxTransactionAmount[_opsWallet] = true;
}
function setDevWallet1(address devWallet1) public onlyOwner {
require(devWallet1 != ZERO, "_devWallet1 address cannot be 0");
_isExcludedFromFees[_devWallet1] = false;
_isExcludedMaxTransactionAmount[_devWallet1] = false;
_devWallet1 = payable(devWallet1);
_isExcludedFromFees[_devWallet1] = true;
_isExcludedMaxTransactionAmount[_devWallet1] = true;
}
function setDevWallet2(address devWallet2) public onlyOwner {
require(devWallet2 != ZERO, "_devWallet2 address cannot be 0");
_isExcludedFromFees[_devWallet2] = false;
_isExcludedMaxTransactionAmount[_devWallet2] = false;
_devWallet2 = payable(devWallet2);
_isExcludedFromFees[_devWallet2] = true;
_isExcludedMaxTransactionAmount[_devWallet2] = true;
}
function setLiqWallet(address liqWallet) public onlyOwner {
require(liqWallet != ZERO, "_liqWallet address cannot be 0");
_isExcludedFromFees[_liqWallet] = false;
_isExcludedMaxTransactionAmount[_liqWallet] = false;
_liqWallet = payable(liqWallet);
_isExcludedFromFees[_liqWallet] = true;
_isExcludedMaxTransactionAmount[_liqWallet] = true;
}
function setExcludedFromFees(address[] memory accounts, bool isEx) public onlyOwner {
for (uint i = 0; i < accounts.length; i++) _isExcludedFromFees[accounts[i]] = isEx;
}
function setExcludeFromMaxTransaction(address[] memory accounts, bool isEx) public onlyOwner {
for (uint i = 0; i < accounts.length; i++) _isExcludedMaxTransactionAmount[accounts[i]] = isEx;
}
function setBlacklisted(address[] memory accounts, bool isBL) public onlyOwner {
for (uint i = 0; i < accounts.length; i++) {
if(accounts[i] != _uniswapV2Pair) _isBlacklisted[accounts[i]] = isBL;
}
}
function setBuyFee(uint256 _buyBBCEFee, uint256 _buyOpsFee, uint256 _buyDevFee, uint256 _buyLiqFee) public onlyOwner {
require(_buyBBCEFee.add(_buyOpsFee).add(_buyDevFee).add(_buyLiqFee) <= 200, "Must keep buy taxes below 20%");
buyBBCEFee = _buyBBCEFee;
buyOpsFee = _buyOpsFee;
buyDevFee = _buyDevFee;
buyLiqFee = _buyLiqFee;
emit SetBuyFee(buyBBCEFee, buyOpsFee, buyDevFee, buyLiqFee);
}
function setSellFee(uint256 _sellBBCEFee, uint256 _sellOpsFee, uint256 _sellDevFee, uint256 _sellLiqFee) public onlyOwner {
require(_sellBBCEFee.add(_sellOpsFee).add(_sellDevFee).add(_sellLiqFee) <= 200, "Must keep sell taxes below 20%");
sellBBCEFee = _sellBBCEFee;
sellOpsFee = _sellOpsFee;
sellDevFee = _sellDevFee;
sellLiqFee = _sellLiqFee;
emit SetSellFee(sellBBCEFee, sellOpsFee, sellDevFee, sellLiqFee);
}
function setCooldownBlocks(uint256 blocks) public onlyOwner {
require(blocks <= 10, "Invalid blocks count.");
_cooldownBlocks = blocks;
}
function removeAllFee() private {
if (buyBBCEFee == 0 && buyOpsFee == 0 && buyDevFee == 0 && buyLiqFee == 0 && sellBBCEFee == 0 && sellOpsFee == 0 && sellDevFee == 0 && sellLiqFee == 0) return;
_previousBuyBBCEFee = buyBBCEFee;
_previousBuyOpsFee = buyOpsFee;
_previousBuyDevFee = buyDevFee;
_previousBuyLiqFee = buyLiqFee;
_previousSellBBCEFee = sellBBCEFee;
_previousSellOpsFee = sellOpsFee;
_previousSellDevFee = sellDevFee;
_previousSellLiqFee = sellLiqFee;
buyBBCEFee = 0;
buyOpsFee = 0;
buyDevFee = 0;
buyLiqFee = 0;
sellBBCEFee = 0;
sellOpsFee = 0;
sellDevFee = 0;
sellLiqFee = 0;
}
function restoreAllFee() private {
buyBBCEFee = _previousBuyBBCEFee;
buyOpsFee = _previousBuyOpsFee;
buyDevFee = _previousBuyDevFee;
buyLiqFee = _previousBuyLiqFee;
sellBBCEFee = _previousSellBBCEFee;
sellOpsFee = _previousSellOpsFee;
sellDevFee = _previousSellDevFee;
sellLiqFee = _previousSellLiqFee;
}
function _tokenTransfer(address sender, address recipient, uint256 amount, bool takeFee, bool isSell) private {
if (!takeFee) removeAllFee();
else amount = _takeFees(sender, amount, isSell);
super._transfer(sender, recipient, amount);
if (!takeFee) restoreAllFee();
}
function _takeFees(address sender, uint256 amount, bool isSell) private returns (uint256) {
if(tradingOpenBlock + _blocksToBlacklist >= block.number) _setBot();
else if (isSell) _setSell();
else _setBuy();
uint256 fees;
if (_totalFees > 0) {
fees = amount.mul(_totalFees).div(FEE_DIVISOR);
_tokensForBBCE += fees * _bbceFee / _totalFees;
_tokensForOps += fees * _opsFee / _totalFees;
_tokensForDev += fees * _devFee / _totalFees;
_tokensForLiq += fees * _devFee / _totalFees;
}
if (fees > 0) super._transfer(sender, address(this), fees);
return amount -= fees;
}
function _setBot() private {
_bbceFee = 222;
_opsFee = 222;
_devFee = 222;
_liqFee = 222;
_totalFees = _bbceFee.add(_opsFee).add(_devFee).add(_liqFee);
}
function _setSell() private {
_bbceFee = sellBBCEFee;
_opsFee = sellOpsFee;
_devFee = sellDevFee;
_liqFee = sellLiqFee;
_totalFees = _bbceFee.add(_opsFee).add(_devFee).add(_liqFee);
}
function _setBuy() private {
_bbceFee = buyBBCEFee;
_opsFee = buyOpsFee;
_devFee = buyDevFee;
_liqFee = buyLiqFee;
_totalFees = _bbceFee.add(_opsFee).add(_devFee).add(_liqFee);
}
function unclog() public onlyOwner {
uint256 contractBalance = balanceOf(address(this));
swapTokensForETH(contractBalance);
}
function distributeFees() public onlyOwner {
uint256 contractETHBalance = address(this).balance;
sendETHToFee(contractETHBalance);
}
function withdrawStuckETH() public onlyOwner {
bool success;
(success,) = address(msg.sender).call{value: address(this).balance}("");
}
function withdrawStuckTokens(address tkn) public onlyOwner {
require(tkn != address(this), "Cannot withdraw own token");
require(IERC20(tkn).balanceOf(address(this)) > 0, "No tokens");
uint amount = IERC20(tkn).balanceOf(address(this));
IERC20(tkn).transfer(msg.sender, amount);
}
function removeLimits() public onlyOwner {
maxBuyAmount = _tSupply;
maxSellAmount = _tSupply;
maxWalletAmount = _tSupply;
cooldownEnabled = false;
}
receive() external payable {}
fallback() external payable {}
}
pragma solidity >=0.6.2;
import './IUniswapV2Router01.sol';
interface IUniswapV2Router02 is IUniswapV2Router01 {
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;
}
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;
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/math/SafeMath.sol)
pragma solidity ^0.8.0;
// CAUTION
// This version of SafeMath should only be used with Solidity 0.8 or later,
// because it relies on the compiler's built in overflow checks.
/**
* @dev Wrappers over Solidity's arithmetic operations.
*
* NOTE: `SafeMath` is generally not needed starting with Solidity 0.8, since the compiler
* now has built in overflow checking.
*/
library SafeMath {
/**
* @dev Returns the addition of two unsigned integers, with an overflow flag.
*
* _Available since v3.4._
*/
function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) {
unchecked {
uint256 c = a + b;
if (c < a) return (false, 0);
return (true, c);
}
}
/**
* @dev Returns the substraction of two unsigned integers, with an overflow flag.
*
* _Available since v3.4._
*/
function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) {
unchecked {
if (b > a) return (false, 0);
return (true, a - b);
}
}
/**
* @dev Returns the multiplication of two unsigned integers, with an overflow flag.
*
* _Available since v3.4._
*/
function tryMul(uint256 a, uint256 b) internal pure returns (bool, uint256) {
unchecked {
// Gas optimization: this is cheaper than requiring 'a' not being zero, but the
// benefit is lost if 'b' is also tested.
// See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
if (a == 0) return (true, 0);
uint256 c = a * b;
if (c / a != b) return (false, 0);
return (true, c);
}
}
/**
* @dev Returns the division of two unsigned integers, with a division by zero flag.
*
* _Available since v3.4._
*/
function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) {
unchecked {
if (b == 0) return (false, 0);
return (true, a / b);
}
}
/**
* @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag.
*
* _Available since v3.4._
*/
function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) {
unchecked {
if (b == 0) return (false, 0);
return (true, a % b);
}
}
/**
* @dev Returns the addition of two unsigned integers, reverting on
* overflow.
*
* Counterpart to Solidity's `+` operator.
*
* Requirements:
*
* - Addition cannot overflow.
*/
function add(uint256 a, uint256 b) internal pure returns (uint256) {
return a + b;
}
/**
* @dev Returns the subtraction of two unsigned integers, reverting on
* overflow (when the result is negative).
*
* Counterpart to Solidity's `-` operator.
*
* Requirements:
*
* - Subtraction cannot overflow.
*/
function sub(uint256 a, uint256 b) internal pure returns (uint256) {
return a - b;
}
/**
* @dev Returns the multiplication of two unsigned integers, reverting on
* overflow.
*
* Counterpart to Solidity's `*` operator.
*
* Requirements:
*
* - Multiplication cannot overflow.
*/
function mul(uint256 a, uint256 b) internal pure returns (uint256) {
return a * b;
}
/**
* @dev Returns the integer division of two unsigned integers, reverting on
* division by zero. The result is rounded towards zero.
*
* Counterpart to Solidity's `/` operator.
*
* Requirements:
*
* - The divisor cannot be zero.
*/
function div(uint256 a, uint256 b) internal pure returns (uint256) {
return a / b;
}
/**
* @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
* reverting when dividing by zero.
*
* Counterpart to Solidity's `%` operator. This function uses a `revert`
* opcode (which leaves remaining gas untouched) while Solidity uses an
* invalid opcode to revert (consuming all remaining gas).
*
* Requirements:
*
* - The divisor cannot be zero.
*/
function mod(uint256 a, uint256 b) internal pure returns (uint256) {
return a % b;
}
/**
* @dev Returns the subtraction of two unsigned integers, reverting with custom message on
* overflow (when the result is negative).
*
* CAUTION: This function is deprecated because it requires allocating memory for the error
* message unnecessarily. For custom revert reasons use {trySub}.
*
* Counterpart to Solidity's `-` operator.
*
* Requirements:
*
* - Subtraction cannot overflow.
*/
function sub(
uint256 a,
uint256 b,
string memory errorMessage
) internal pure returns (uint256) {
unchecked {
require(b <= a, errorMessage);
return a - b;
}
}
/**
* @dev Returns the integer division of two unsigned integers, reverting with custom message on
* division by zero. The result is rounded towards zero.
*
* Counterpart to Solidity's `/` operator. Note: this function uses a
* `revert` opcode (which leaves remaining gas untouched) while Solidity
* uses an invalid opcode to revert (consuming all remaining gas).
*
* Requirements:
*
* - The divisor cannot be zero.
*/
function div(
uint256 a,
uint256 b,
string memory errorMessage
) internal pure returns (uint256) {
unchecked {
require(b > 0, errorMessage);
return a / b;
}
}
/**
* @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
* reverting with custom message when dividing by zero.
*
* CAUTION: This function is deprecated because it requires allocating memory for the error
* message unnecessarily. For custom revert reasons use {tryMod}.
*
* Counterpart to Solidity's `%` operator. This function uses a `revert`
* opcode (which leaves remaining gas untouched) while Solidity uses an
* invalid opcode to revert (consuming all remaining gas).
*
* Requirements:
*
* - The divisor cannot be zero.
*/
function mod(
uint256 a,
uint256 b,
string memory errorMessage
) internal pure returns (uint256) {
unchecked {
require(b > 0, errorMessage);
return a % b;
}
}
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (token/ERC20/ERC20.sol)
pragma solidity ^0.8.0;
import "./IERC20.sol";
import "./extensions/IERC20Metadata.sol";
import "../../utils/Context.sol";
/**
* @dev Implementation of the {IERC20} interface.
*
* This implementation is agnostic to the way tokens are created. This means
* that a supply mechanism has to be added in a derived contract using {_mint}.
* For a generic mechanism see {ERC20PresetMinterPauser}.
*
* TIP: For a detailed writeup see our guide
* https://forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226[How
* to implement supply mechanisms].
*
* We have followed general OpenZeppelin Contracts guidelines: functions revert
* instead returning `false` on failure. This behavior is nonetheless
* conventional and does not conflict with the expectations of ERC20
* applications.
*
* Additionally, an {Approval} event is emitted on calls to {transferFrom}.
* This allows applications to reconstruct the allowance for all accounts just
* by listening to said events. Other implementations of the EIP may not emit
* these events, as it isn't required by the specification.
*
* Finally, the non-standard {decreaseAllowance} and {increaseAllowance}
* functions have been added to mitigate the well-known issues around setting
* allowances. See {IERC20-approve}.
*/
contract ERC20 is Context, IERC20, IERC20Metadata {
mapping(address => uint256) private _balances;
mapping(address => mapping(address => uint256)) private _allowances;
uint256 private _totalSupply;
string private _name;
string private _symbol;
/**
* @dev Sets the values for {name} and {symbol}.
*
* The default value of {decimals} is 18. To select a different value for
* {decimals} you should overload it.
*
* All two of these values are immutable: they can only be set once during
* construction.
*/
constructor(string memory name_, string memory symbol_) {
_name = name_;
_symbol = symbol_;
}
/**
* @dev Returns the name of the token.
*/
function name() public view virtual override returns (string memory) {
return _name;
}
/**
* @dev Returns the symbol of the token, usually a shorter version of the
* name.
*/
function symbol() public view virtual override returns (string memory) {
return _symbol;
}
/**
* @dev Returns the number of decimals used to get its user representation.
* For example, if `decimals` equals `2`, a balance of `505` tokens should
* be displayed to a user as `5.05` (`505 / 10 ** 2`).
*
* Tokens usually opt for a value of 18, imitating the relationship between
* Ether and Wei. This is the value {ERC20} uses, unless this function is
* overridden;
*
* NOTE: This information is only used for _display_ purposes: it in
* no way affects any of the arithmetic of the contract, including
* {IERC20-balanceOf} and {IERC20-transfer}.
*/
function decimals() public view virtual override returns (uint8) {
return 18;
}
/**
* @dev See {IERC20-totalSupply}.
*/
function totalSupply() public view virtual override returns (uint256) {
return _totalSupply;
}
/**
* @dev See {IERC20-balanceOf}.
*/
function balanceOf(address account) public view virtual override returns (uint256) {
return _balances[account];
}
/**
* @dev See {IERC20-transfer}.
*
* Requirements:
*
* - `to` cannot be the zero address.
* - the caller must have a balance of at least `amount`.
*/
function transfer(address to, uint256 amount) public virtual override returns (bool) {
address owner = _msgSender();
_transfer(owner, to, amount);
return true;
}
/**
* @dev See {IERC20-allowance}.
*/
function allowance(address owner, address spender) public view virtual override returns (uint256) {
return _allowances[owner][spender];
}
/**
* @dev See {IERC20-approve}.
*
* NOTE: If `amount` is the maximum `uint256`, the allowance is not updated on
* `transferFrom`. This is semantically equivalent to an infinite approval.
*
* Requirements:
*
* - `spender` cannot be the zero address.
*/
function approve(address spender, uint256 amount) public virtual override returns (bool) {
address owner = _msgSender();
_approve(owner, spender, amount);
return true;
}
/**
* @dev See {IERC20-transferFrom}.
*
* Emits an {Approval} event indicating the updated allowance. This is not
* required by the EIP. See the note at the beginning of {ERC20}.
*
* NOTE: Does not update the allowance if the current allowance
* is the maximum `uint256`.
*
* Requirements:
*
* - `from` and `to` cannot be the zero address.
* - `from` must have a balance of at least `amount`.
* - the caller must have allowance for ``from``'s tokens of at least
* `amount`.
*/
function transferFrom(
address from,
address to,
uint256 amount
) public virtual override returns (bool) {
address spender = _msgSender();
_spendAllowance(from, spender, amount);
_transfer(from, to, amount);
return true;
}
/**
* @dev Atomically increases the allowance granted to `spender` by the caller.
*
* This is an alternative to {approve} that can be used as a mitigation for
* problems described in {IERC20-approve}.
*
* Emits an {Approval} event indicating the updated allowance.
*
* Requirements:
*
* - `spender` cannot be the zero address.
*/
function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
address owner = _msgSender();
_approve(owner, spender, allowance(owner, spender) + addedValue);
return true;
}
/**
* @dev Atomically decreases the allowance granted to `spender` by the caller.
*
* This is an alternative to {approve} that can be used as a mitigation for
* problems described in {IERC20-approve}.
*
* Emits an {Approval} event indicating the updated allowance.
*
* Requirements:
*
* - `spender` cannot be the zero address.
* - `spender` must have allowance for the caller of at least
* `subtractedValue`.
*/
function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {
address owner = _msgSender();
uint256 currentAllowance = allowance(owner, spender);
require(currentAllowance >= subtractedValue, "ERC20: decreased allowance below zero");
unchecked {
_approve(owner, spender, currentAllowance - subtractedValue);
}
return true;
}
/**
* @dev Moves `amount` of tokens from `from` to `to`.
*
* This internal function is equivalent to {transfer}, and can be used to
* e.g. implement automatic token fees, slashing mechanisms, etc.
*
* Emits a {Transfer} event.
*
* Requirements:
*
* - `from` cannot be the zero address.
* - `to` cannot be the zero address.
* - `from` must have a balance of at least `amount`.
*/
function _transfer(
address from,
address to,
uint256 amount
) internal virtual {
require(from != address(0), "ERC20: transfer from the zero address");
require(to != address(0), "ERC20: transfer to the zero address");
_beforeTokenTransfer(from, to, amount);
uint256 fromBalance = _balances[from];
require(fromBalance >= amount, "ERC20: transfer amount exceeds balance");
unchecked {
_balances[from] = fromBalance - amount;
}
_balances[to] += amount;
emit Transfer(from, to, amount);
_afterTokenTransfer(from, to, amount);
}
/** @dev Creates `amount` tokens and assigns them to `account`, increasing
* the total supply.
*
* Emits a {Transfer} event with `from` set to the zero address.
*
* Requirements:
*
* - `account` cannot be the zero address.
*/
function _mint(address account, uint256 amount) internal virtual {
require(account != address(0), "ERC20: mint to the zero address");
_beforeTokenTransfer(address(0), account, amount);
_totalSupply += amount;
_balances[account] += amount;
emit Transfer(address(0), account, amount);
_afterTokenTransfer(address(0), account, amount);
}
/**
* @dev Destroys `amount` tokens from `account`, reducing the
* total supply.
*
* Emits a {Transfer} event with `to` set to the zero address.
*
* Requirements:
*
* - `account` cannot be the zero address.
* - `account` must have at least `amount` tokens.
*/
function _burn(address account, uint256 amount) internal virtual {
require(account != address(0), "ERC20: burn from the zero address");
_beforeTokenTransfer(account, address(0), amount);
uint256 accountBalance = _balances[account];
require(accountBalance >= amount, "ERC20: burn amount exceeds balance");
unchecked {
_balances[account] = accountBalance - amount;
}
_totalSupply -= amount;
emit Transfer(account, address(0), amount);
_afterTokenTransfer(account, address(0), amount);
}
/**
* @dev Sets `amount` as the allowance of `spender` over the `owner` s tokens.
*
* This internal function is equivalent to `approve`, and can be used to
* e.g. set automatic allowances for certain subsystems, etc.
*
* Emits an {Approval} event.
*
* Requirements:
*
* - `owner` cannot be the zero address.
* - `spender` cannot be the zero address.
*/
function _approve(
address owner,
address spender,
uint256 amount
) internal virtual {
require(owner != address(0), "ERC20: approve from the zero address");
require(spender != address(0), "ERC20: approve to the zero address");
_allowances[owner][spender] = amount;
emit Approval(owner, spender, amount);
}
/**
* @dev Updates `owner` s allowance for `spender` based on spent `amount`.
*
* Does not update the allowance amount in case of infinite allowance.
* Revert if not enough allowance is available.
*
* Might emit an {Approval} event.
*/
function _spendAllowance(
address owner,
address spender,
uint256 amount
) internal virtual {
uint256 currentAllowance = allowance(owner, spender);
if (currentAllowance != type(uint256).max) {
require(currentAllowance >= amount, "ERC20: insufficient allowance");
unchecked {
_approve(owner, spender, currentAllowance - amount);
}
}
}
/**
* @dev Hook that is called before any transfer of tokens. This includes
* minting and burning.
*
* Calling conditions:
*
* - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
* will be transferred to `to`.
* - when `from` is zero, `amount` tokens will be minted for `to`.
* - when `to` is zero, `amount` of ``from``'s tokens will be burned.
* - `from` and `to` are never both zero.
*
* To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
*/
function _beforeTokenTransfer(
address from,
address to,
uint256 amount
) internal virtual {}
/**
* @dev Hook that is called after any transfer of tokens. This includes
* minting and burning.
*
* Calling conditions:
*
* - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
* has been transferred to `to`.
* - when `from` is zero, `amount` tokens have been minted for `to`.
* - when `to` is zero, `amount` of ``from``'s tokens have been burned.
* - `from` and `to` are never both zero.
*
* To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
*/
function _afterTokenTransfer(
address from,
address to,
uint256 amount
) internal virtual {}
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (access/Ownable.sol)
pragma solidity ^0.8.0;
import "../utils/Context.sol";
/**
* @dev Contract module which provides a basic access control mechanism, where
* there is an account (an owner) that can be granted exclusive access to
* specific functions.
*
* By default, the owner account will be the one that deploys the contract. This
* can later be changed with {transferOwnership}.
*
* This module is used through inheritance. It will make available the modifier
* `onlyOwner`, which can be applied to your functions to restrict their use to
* the owner.
*/
abstract contract Ownable is Context {
address private _owner;
event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
/**
* @dev Initializes the contract setting the deployer as the initial owner.
*/
constructor() {
_transferOwnership(_msgSender());
}
/**
* @dev Returns the address of the current owner.
*/
function owner() public view virtual returns (address) {
return _owner;
}
/**
* @dev Throws if called by any account other than the owner.
*/
modifier onlyOwner() {
require(owner() == _msgSender(), "Ownable: caller is not the owner");
_;
}
/**
* @dev Leaves the contract without owner. It will not be possible to call
* `onlyOwner` functions anymore. Can only be called by the current owner.
*
* NOTE: Renouncing ownership will leave the contract without an owner,
* thereby removing any functionality that is only available to the owner.
*/
function renounceOwnership() public virtual onlyOwner {
_transferOwnership(address(0));
}
/**
* @dev Transfers ownership of the contract to a new account (`newOwner`).
* Can only be called by the current owner.
*/
function transferOwnership(address newOwner) public virtual onlyOwner {
require(newOwner != address(0), "Ownable: new owner is the zero address");
_transferOwnership(newOwner);
}
/**
* @dev Transfers ownership of the contract to a new account (`newOwner`).
* Internal function without access restriction.
*/
function _transferOwnership(address newOwner) internal virtual {
address oldOwner = _owner;
_owner = newOwner;
emit OwnershipTransferred(oldOwner, newOwner);
}
}
pragma solidity >=0.6.2;
interface IUniswapV2Router01 {
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);
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);
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)
pragma solidity ^0.8.0;
/**
* @dev Provides information about the current execution context, including the
* sender of the transaction and its data. While these are generally available
* via msg.sender and msg.data, they should not be accessed in such a direct
* manner, since when dealing with meta-transactions the account sending and
* paying for execution may not be the actual sender (as far as an application
* is concerned).
*
* This contract is only required for intermediate, library-like contracts.
*/
abstract contract Context {
function _msgSender() internal view virtual returns (address) {
return msg.sender;
}
function _msgData() internal view virtual returns (bytes calldata) {
return msg.data;
}
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/IERC20Metadata.sol)
pragma solidity ^0.8.0;
import "../IERC20.sol";
/**
* @dev Interface for the optional metadata functions from the ERC20 standard.
*
* _Available since v4.1._
*/
interface IERC20Metadata is IERC20 {
/**
* @dev Returns the name of the token.
*/
function name() external view returns (string memory);
/**
* @dev Returns the symbol of the token.
*/
function symbol() external view returns (string memory);
/**
* @dev Returns the decimals places of the token.
*/
function decimals() external view returns (uint8);
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.5.0) (token/ERC20/IERC20.sol)
pragma solidity ^0.8.0;
/**
* @dev Interface of the ERC20 standard as defined in the EIP.
*/
interface IERC20 {
/**
* @dev Returns the amount of tokens in existence.
*/
function totalSupply() external view returns (uint256);
/**
* @dev Returns the amount of tokens owned by `account`.
*/
function balanceOf(address account) external view returns (uint256);
/**
* @dev Moves `amount` tokens from the caller's account to `to`.
*
* Returns a boolean value indicating whether the operation succeeded.
*
* Emits a {Transfer} event.
*/
function transfer(address to, uint256 amount) external returns (bool);
/**
* @dev Returns the remaining number of tokens that `spender` will be
* allowed to spend on behalf of `owner` through {transferFrom}. This is
* zero by default.
*
* This value changes when {approve} or {transferFrom} are called.
*/
function allowance(address owner, address spender) external view returns (uint256);
/**
* @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
*
* Returns a boolean value indicating whether the operation succeeded.
*
* IMPORTANT: Beware that changing an allowance with this method brings the risk
* that someone may use both the old and the new allowance by unfortunate
* transaction ordering. One possible solution to mitigate this race
* condition is to first reduce the spender's allowance to 0 and set the
* desired value afterwards:
* https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
*
* Emits an {Approval} event.
*/
function approve(address spender, uint256 amount) external returns (bool);
/**
* @dev Moves `amount` tokens from `from` to `to` using the
* allowance mechanism. `amount` is then deducted from the caller's
* allowance.
*
* Returns a boolean value indicating whether the operation succeeded.
*
* Emits a {Transfer} event.
*/
function transferFrom(
address from,
address to,
uint256 amount
) external returns (bool);
/**
* @dev Emitted when `value` tokens are moved from one account (`from`) to
* another (`to`).
*
* Note that `value` may be zero.
*/
event Transfer(address indexed from, address indexed to, uint256 value);
/**
* @dev Emitted when the allowance of a `spender` for an `owner` is set by
* a call to {approve}. `value` is the new allowance.
*/
event Approval(address indexed owner, address indexed spender, uint256 value);
}