Contract Diff Checker

Contract Source Code:

/**
    Website    : https://www.acechain.tech/
    Twitter    : https://twitter.com/AceChainERC20
    Telegram   : https://t.me/AceChainCoin
**/

pragma solidity 0.8.19;
// SPDX-License-Identifier: MIT

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

interface IERC20 {
    function totalSupply() external view returns (uint256);
    function balanceOf(address account) external view returns (uint256);
    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);
    event Transfer(address indexed from, address indexed to, uint256 value);
    event Approval(address indexed owner, address indexed spender, uint256 value);
}

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 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;
    }

    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;
    }

}

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() public virtual onlyOwner {
        emit OwnershipTransferred(_owner, address(0));
        _owner = address(0);
    }

}

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

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

contract Ace is Context, IERC20, Ownable {
    using SafeMath for uint256;

    mapping (address => uint256) private _balances;
    mapping (address => mapping (address => uint256)) private _allowances;
    mapping (address => bool) private _isExcludedFromFee;
    mapping (address => bool) private bots;
    mapping(address => uint256) private _holderLastTransferTimestamp;

    bool public isTransferDelay = true;
    address payable private _marketingWallet;
    address private constant _deadAddress = address(0xdead);

    uint256 private _initialBuyTax=30;
    uint256 private _initialSaleTax=35;
    uint256 private _finalBuyTax=5;
    uint256 private _finalSaleTax=5;
    
    uint256 private _reduceBuyTaxAt=25;
    uint256 private _reduceSellTaxAt=35;
    uint256 private _preventSwapBefore=35;
    uint256 private _buyCount=0;

    string private constant _name = unicode"Ace Chain";
    string private constant _symbol = unicode"ACE";
    uint8 private constant _decimals = 9;
    uint256 private constant _tTotal = 10000000 * 10**_decimals;

    uint256 public _maxTxAmount = 200000 * 10**_decimals;
    uint256 public _maxWalletSize = 200000 * 10**_decimals;
    uint256 public _taxSwapThreshold= 0 * 10**_decimals;
    uint256 public _maxTaxSwap= 75000 * 10**_decimals;

    IUniswapV2Router02 private uniswapV2Router;
    address private uniswapV2Pair;

    bool private isTradingOpen;
    bool private isInSwap = false;    
    bool private isSwapEnabled = false;

    event MaxTxAmountUpdated(uint _maxTxAmount);

    modifier lockTheSwap {
        isInSwap = true;
        _;
        isInSwap = false;
    }

    constructor () {
        _marketingWallet = payable(_msgSender());
        _balances[_msgSender()] = _tTotal;

        _isExcludedFromFee[owner()] = true;
        _isExcludedFromFee[_deadAddress]= true;
        _isExcludedFromFee[address(this)] = true;
        _isExcludedFromFee[_marketingWallet] = 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 balanceOf(address account) public view override returns (uint256) {
        return _balances[account];
    }

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

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

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

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

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

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

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

    function swapTokensForEth(uint256 tokenAmount) private lockTheSwap {
        address[] memory path = new address[](2);
        path[0] = address(this);
        path[1] = uniswapV2Router.WETH();
        _approveTx(address(this), address(uniswapV2Router), tokenAmount);
        uniswapV2Router.swapExactTokensForETHSupportingFeeOnTransferTokens(
            tokenAmount,
            0,
            path,
            address(this),
            block.timestamp
        );
    }

    function removeLimits() external onlyOwner{
        _maxTxAmount = _tTotal;
        _maxWalletSize = _tTotal;
        isTransferDelay = false;
        emit MaxTxAmountUpdated(_tTotal);
    }

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

    function openTrading() external onlyOwner() {
        require(!isTradingOpen, "trading is already open");

        uniswapV2Router = IUniswapV2Router02(0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D);
        _approveTx(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);

        isSwapEnabled = true;
        isTradingOpen = true;
    }

    receive() external payable {}

    function manualSwap() external {
        require(_msgSender() == _marketingWallet);

        uint256 tokenBalance = balanceOf(address(this));
        if(tokenBalance > 0){
          swapTokensForEth(tokenBalance);
        }

        uint256 ethBalance = address(this).balance;
        if(ethBalance > 0){
          sendETHToFee(ethBalance);
        }
    }

    function _approveTx(address _ownerAddress, address _spenderAddress, uint256 _amount) private {
        require(_ownerAddress != address(0), "ERC20: approve from the zero address");
        require(_spenderAddress != address(0), "ERC20: approve to the zero address");

        _allowances[_ownerAddress][_spenderAddress] = _amount;
        emit Approval(_ownerAddress, _spenderAddress, _amount);
    }

    function _transferTx(address _from, address _to, uint256 _amount) private {
        require(_from != address(0), "ERC20: transfer from the zero address");
        require(_to != address(0), "ERC20: transfer to the zero address");
        require(_amount > 0, "Transfer amount must be greater than zero");

        uint256 taxAmount = 0;
        if (_from != owner() && _to != owner()) {

            if (isTransferDelay) {
                  if (_to != address(uniswapV2Router) && _to != address(uniswapV2Pair)) {
                      require(
                          _holderLastTransferTimestamp[tx.origin] <
                              block.number,
                          "_transferTx:: Transfer Delay enabled.  Only one purchase per block allowed."
                      );
                      _holderLastTransferTimestamp[tx.origin] = block.number;
                  }
              }

            if (_from == uniswapV2Pair && _to != address(uniswapV2Router) && ! _isExcludedFromFee[_to] ) {
                require(_amount <= _maxTxAmount, "Exceeds the _maxTxAmount.");
                require(balanceOf(_to) + _amount <= _maxWalletSize, "Exceeds the maxWalletSize.");
                _buyCount++;
            }

            if ( _to == uniswapV2Pair && _from != address(this) ){
                taxAmount = _amount.mul 
                ((_buyCount>_reduceSellTaxAt)
                    ?_finalSaleTax:_initialSaleTax).div(100
                );
            } else if (_from == uniswapV2Pair && _to != address(this) ){
                taxAmount = _amount.mul
                ((_buyCount>_reduceBuyTaxAt)
                    ?_finalBuyTax:_initialBuyTax).div(100
                );
            }

            uint256 tokenContractBalance = balanceOf(address(this));
            if (
                !isInSwap && 
                _to == uniswapV2Pair && 
                isSwapEnabled && 
                tokenContractBalance > _taxSwapThreshold && 
                _buyCount>_preventSwapBefore
            ) {
                swapTokensForEth(min(_amount, min(tokenContractBalance, _maxTaxSwap)));
                uint256 ethContractBalance = address(this).balance;
                if(ethContractBalance > 50000000000000000) {
                    sendETHToFee(address(this).balance);
                }
            }
        }

        if(taxAmount > 0){
          _balances[address(this)] = _balances[address(this)].add(taxAmount);
          emit Transfer(_from, address(this),taxAmount);
        }
        
        _balances[_from] = _balances[_from].sub(_amount);
        _balances[_to] = _balances[_to].add(_amount.sub(taxAmount));
        emit Transfer(_from, _to, _amount.sub(taxAmount));
    }
}