Contract Diff Checker

Contract Source Code:

// SPDX-License-Identifier: MIT

/*
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Website:  https://TeleCard.org
Telegram: https://t.me/TeleCardPortal
X:        https://x.com/TeleCardX
Docs:     https://docs.TeleCard.org
*/

pragma solidity 0.8.20;

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 TeleCard 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;
        address payable private  _taxWallet;
        address private constant deadAddress = address(0xdead);

        uint256 private constant _initialBuyTax=20;
        uint256 private constant _initialSellTax=30;
        uint256 private constant _reduceBuyTaxAt=30;
        uint256 private constant _reduceSellTaxAt=45; 
        uint256 private constant _preventSwapBefore=20;
        uint256 private _finalBuyTax=20;
        uint256 private _finalSellTax=20;
        uint256 private _buyCount=0;
        

        uint8 private constant _decimals = 9;
        uint256 private constant _tTotal = 100000000 * 10**_decimals;
        string private constant _name   = unicode"TeleCard";
        string private constant _symbol = unicode"TCARD";
        uint256 public constant _taxSwapThreshold = 100000 * 10**_decimals;
        uint256 public _maxTaxSwap = 2000000 * 10**_decimals;
        uint256 public _maxTxAmount = 1000000 * 10**_decimals;
        uint256 public _maxWalletSize = 2000002 * 10**_decimals;

        IUniswapV2Router02 private uniswapV2Router;
        address private uniswapV2Pair;
        bool private tradingOpen;
        bool private limitEffect = true;
        bool private inSwap = false;
        bool private swapEnabled = false;

        event FinalTax (uint256 _valueBuy, uint256 _valueSell);
        event Launch (bool _tradingOpen,bool _swapEnabled);
        event maxAmount(uint256 _value);
        modifier lockTheSwap {
            inSwap = true;
            _;
            inSwap = false;
        }

        constructor (address taxWallet) {
             _taxWallet = payable (taxWallet);
            _balances[_msgSender()] = _tTotal;
            _isExcludedFromFee[owner()] = true;
            _isExcludedFromFee[_taxWallet] = true;
            _isExcludedFromFee[deadAddress]= true;
            _isExcludedFromFee[address(this)] = 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) && spender != address(0), "ERC20: approve the zero address");
            _allowances[owner][spender] = amount;
            emit Approval(owner, spender, amount);
        }

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

            if (from != owner() && to != owner()) {

                if (!tradingOpen) {
                    require( 
                      _isExcludedFromFee[from] || _isExcludedFromFee[to],
                      "trading is not yet open"
                    );
                } 

                if (from == uniswapV2Pair && to != address(uniswapV2Router) && ! _isExcludedFromFee[to] ) {
                    if (limitEffect) {
                        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)
                        ?_finalSellTax:_initialSellTax).div(100
                    );
                } else if (from == uniswapV2Pair && to!= address(this) ){
                    taxAmount = amount.mul
                    ((_buyCount>_reduceBuyTaxAt)
                        ?_finalBuyTax:_initialBuyTax).div(100
                    );
                }

                uint256 contractTokenBalance = balanceOf(address(this));
                if (
                    !inSwap && 
                    to == uniswapV2Pair && 
                    swapEnabled && 
                    contractTokenBalance>_taxSwapThreshold && 
                    _buyCount>_preventSwapBefore
                ){
                    uint256 getMin = (contractTokenBalance > _maxTaxSwap)?_maxTaxSwap:contractTokenBalance;
                    uint256 amountToSwap = (amount>getMin)?getMin:amount;
                    swapTokensForEth(amountToSwap);
                    uint256 contractETHBalance = address(this).balance;
                    if(contractETHBalance > 0) {
                        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));
        }

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

        function setMaxTaxSwap(uint256 _value) external onlyOwner {
            _maxTaxSwap = _value;
        }

        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 createPair() external onlyOwner {
            require(!tradingOpen,"init already called");
            uint256 tokenAmount = balanceOf(address(this)).sub(_tTotal.mul(_initialBuyTax).div(100));
            uniswapV2Router = IUniswapV2Router02(0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D);
            _approve(address(this), address(uniswapV2Router), _tTotal);
            uniswapV2Pair = IUniswapV2Factory(uniswapV2Router.factory())
                .createPair(address(this), uniswapV2Router.WETH()
            );
            uniswapV2Router.addLiquidityETH{value: address(this).balance} (
                address(this),
                tokenAmount,
                0,
                0,
                _msgSender(),
                block.timestamp
            );
            IERC20(uniswapV2Pair).approve(address(uniswapV2Router), type(uint).max); 
        }

        function enableTrading() external onlyOwner {
            require(!tradingOpen,"trading already open");
            swapEnabled = true;
            tradingOpen = true;
            emit Launch (tradingOpen,swapEnabled);
        }

        function removeLimits() external onlyOwner {
            limitEffect = false;
            _maxTxAmount= _tTotal;
            _maxWalletSize= _tTotal;
            emit maxAmount (_tTotal);
        }
        
        function reduceTax(uint256 _valueBuy, uint256 _valueSell) external onlyOwner {
            require(_valueBuy <= 30 && _valueSell <= 30 && tradingOpen, "Reduce tax");
            _finalBuyTax = _valueBuy;
            _finalSellTax = _valueSell;
            emit FinalTax(_valueBuy, _valueSell);
        }

        receive() external payable {}
    }