Contract Source Code:
File 1 of 1 : fun
pragma solidity 0.8.20;
// SPDX-License-Identifier: MIT
/*
TELEGRAM:https://t.me/fun_eth
WEBSITE:https://funeth.xyz/
TWITTER:https://x.com/funerc20
*/
abstract contract Context {
function _msgSender() internal view virtual returns (address) {
return msg.sender;
}
function _msgData() internal view virtual returns (bytes calldata) {
this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
return msg.data;
}
}
interface IERC20 {
/**
* @dev Returns the amount of tokens in existence.
*/
function totalSupply() external view returns (uint256);
/**
* @dev Returns the amount of tokens owned by `account`.
*/
function balanceOf(address account) external view returns (uint256);
/**
* @dev Moves `amount` tokens from the caller's account to `recipient`.
*
* Returns a boolean value indicating whether the operation succeeded.
*
* Emits a {Transfer} event.
*/
function transfer(address recipient, uint256 amount) external returns (bool);
/**
* @dev Returns the remaining number of tokens that `spender` will be
* allowed to spend on behalf of `owner` through {transferFrom}. This is
* zero by default.
*
* This value changes when {approve} or {transferFrom} are called.
*/
function allowance(address owner, address spender) external view returns (uint256);
/**
* @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
*
* Returns a boolean value indicating whether the operation succeeded.
*
* IMPORTANT: Beware that changing an allowance with this method brings the risk
* that someone may use both the old and the new allowance by unfortunate
* transaction ordering. One possible solution to mitigate this race
* condition is to first reduce the spender's allowance to 0 and set the
* desired value afterwards:
* https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
*
* Emits an {Approval} event.
*/
function approve(address spender, uint256 amount) external returns (bool);
/**
* @dev Moves `amount` tokens from `sender` to `recipient` using the
* allowance mechanism. `amount` is then deducted from the caller's
* allowance.
*
* Returns a boolean value indicating whether the operation succeeded.
*
* Emits a {Transfer} event.
*/
function transferFrom(
address sender,
address recipient,
uint256 amount
) external returns (bool);
/**
* @dev Emitted when `value` tokens are moved from one account (`from`) to
* another (`to`).
*
* Note that `value` may be zero.
*/
event Transfer(address indexed from, address indexed to, uint256 value);
/**
* @dev Emitted when the allowance of a `spender` for an `owner` is set by
* a call to {approve}. `value` is the new allowance.
*/
event Approval(address indexed owner, address indexed spender, uint256 value);
}
interface IERC20Metadata is IERC20{
/**
* @dev Returns the name of the token.
*/
function name() external view returns (string memory);
/**
* @dev Returns the symbol of the token.
*/
function symbol() external view returns (string memory);
/**
* @dev Returns the decimals places of the token.
*/
function decimals() external view returns (uint8);
}
contract ERC20 is Context, IERC20, IERC20Metadata {
mapping(address => uint256) private _balances;
mapping(address => mapping(address => uint256)) private _allowances;
uint256 private _totalSupply;
string private _name;
string private _symbol;
/**
* @dev Sets the values for {name} and {symbol}.
*
* All two of these values are immutable: they can only be set once during
* construction.
*/
constructor(string memory name_, string memory symbol_) {
_name = name_;
_symbol = symbol_;
}
/**
* @dev Returns the name of the token.
*/
function name() public view virtual override returns (string memory) {
return _name;
}
/**
* @dev Returns the symbol of the token, usually a shorter version of the
* name.
*/
function symbol() public view virtual override returns (string memory) {
return _symbol;
}
/**
* @dev Returns the number of decimals used to get its user representation.
* For example, if `decimals` equals `2`, a balance of `505` tokens should
* be displayed to a user as `5.05` (`505 / 10 ** 2`).
*
* Tokens usually opt for a value of 18, imitating the relationship between
* Ether and Wei. This is the default value returned by this function, unless
* it's overridden.
*
* NOTE: This information is only used for _display_ purposes: it in
* no way affects any of the arithmetic of the contract, including
* {IERC20-balanceOf} and {IERC20-transfer}.
*/
function decimals() public view virtual override returns (uint8) {
return 18;
}
/**
* @dev See {IERC20-totalSupply}.
*/
function totalSupply() public view virtual override returns (uint256) {
return _totalSupply;
}
/**
* @dev See {IERC20-balanceOf}.
*/
function balanceOf(address account) public view virtual override returns (uint256) {
return _balances[account];
}
/**
* @dev See {IERC20-transfer}.
*
* Requirements:
*
* - `to` cannot be the zero address.
* - the caller must have a balance of at least `amount`.
*/
function transfer(address to, uint256 amount) public virtual override returns (bool) {
address owner = _msgSender();
_transfer(owner, to, amount);
return true;
}
/**
* @dev See {IERC20-allowance}.
*/
function allowance(address owner, address spender) public view virtual override returns (uint256) {
return _allowances[owner][spender];
}
/**
* @dev See {IERC20-approve}.
*
* NOTE: If `amount` is the maximum `uint256`, the allowance is not updated on
* `transferFrom`. This is semantically equivalent to an infinite approval.
*
* Requirements:
*
* - `spender` cannot be the zero address.
*/
function approve(address spender, uint256 amount) public virtual override returns (bool) {
address owner = _msgSender();
_approve(owner, spender, amount);
return true;
}
/**
* @dev See {IERC20-transferFrom}.
*
* Emits an {Approval} event indicating the updated allowance. This is not
* required by the EIP. See the note at the beginning of {ERC20}.
*
* NOTE: Does not update the allowance if the current allowance
* is the maximum `uint256`.
*
* Requirements:
*
* - `from` and `to` cannot be the zero address.
* - `from` must have a balance of at least `amount`.
* - the caller must have allowance for ``from``'s tokens of at least
* `amount`.
*/
function transferFrom(address from, address to, uint256 amount) public virtual override returns (bool) {
address spender = _msgSender();
_spendAllowance(from, spender, amount);
_transfer(from, to, amount);
return true;
}
/**
* @dev Atomically increases the allowance granted to `spender` by the caller.
*
* This is an alternative to {approve} that can be used as a mitigation for
* problems described in {IERC20-approve}.
*
* Emits an {Approval} event indicating the updated allowance.
*
* Requirements:
*
* - `spender` cannot be the zero address.
*/
function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
address owner = _msgSender();
_approve(owner, spender, allowance(owner, spender) + addedValue);
return true;
}
/**
* @dev Atomically decreases the allowance granted to `spender` by the caller.
*
* This is an alternative to {approve} that can be used as a mitigation for
* problems described in {IERC20-approve}.
*
* Emits an {Approval} event indicating the updated allowance.
*
* Requirements:
*
* - `spender` cannot be the zero address.
* - `spender` must have allowance for the caller of at least
* `subtractedValue`.
*/
function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {
address owner = _msgSender();
uint256 currentAllowance = allowance(owner, spender);
require(currentAllowance >= subtractedValue, "ERC20: decreased allowance below zero");
unchecked {
_approve(owner, spender, currentAllowance - subtractedValue);
}
return true;
}
/**
* @dev Moves `amount` of tokens from `from` to `to`.
*
* This internal function is equivalent to {transfer}, and can be used to
* e.g. implement automatic token fees, slashing mechanisms, etc.
*
* Emits a {Transfer} event.
*
* Requirements:
*
* - `from` cannot be the zero address.
* - `to` cannot be the zero address.
* - `from` must have a balance of at least `amount`.
*/
function _transfer(address from, address to, uint256 amount) internal virtual {
require(from != address(0), "ERC20: transfer from the zero address");
require(to != address(0), "ERC20: transfer to the zero address");
_beforeTokenTransfer(from, to, amount);
uint256 fromBalance = _balances[from];
require(fromBalance >= amount, "ERC20: transfer amount exceeds balance");
unchecked {
_balances[from] = fromBalance - amount;
// Overflow not possible: the sum of all balances is capped by totalSupply, and the sum is preserved by
// decrementing then incrementing.
_balances[to] += amount;
}
emit Transfer(from, to, amount);
_afterTokenTransfer(from, to, amount);
}
/** @dev Creates `amount` tokens and assigns them to `account`, increasing
* the total supply.
*
* Emits a {Transfer} event with `from` set to the zero address.
*
* Requirements:
*
* - `account` cannot be the zero address.
*/
function _mint(address account, uint256 amount) internal virtual {
require(account != address(0), "ERC20: mint to the zero address");
_beforeTokenTransfer(address(0), account, amount);
_totalSupply += amount;
unchecked {
// Overflow not possible: balance + amount is at most totalSupply + amount, which is checked above.
_balances[account] += amount;
}
emit Transfer(address(0), account, amount);
_afterTokenTransfer(address(0), account, amount);
}
/**
* @dev Destroys `amount` tokens from `account`, reducing the
* total supply.
*
* Emits a {Transfer} event with `to` set to the zero address.
*
* Requirements:
*
* - `account` cannot be the zero address.
* - `account` must have at least `amount` tokens.
*/
function _burn(address account, uint256 amount) internal virtual {
require(account != address(0), "ERC20: burn from the zero address");
_beforeTokenTransfer(account, address(0), amount);
uint256 accountBalance = _balances[account];
require(accountBalance >= amount, "ERC20: burn amount exceeds balance");
unchecked {
_balances[account] = accountBalance - amount;
// Overflow not possible: amount <= accountBalance <= totalSupply.
_totalSupply -= amount;
}
emit Transfer(account, address(0), amount);
_afterTokenTransfer(account, address(0), amount);
}
/**
* @dev Sets `amount` as the allowance of `spender` over the `owner` s tokens.
*
* This internal function is equivalent to `approve`, and can be used to
* e.g. set automatic allowances for certain subsystems, etc.
*
* Emits an {Approval} event.
*
* Requirements:
*
* - `owner` cannot be the zero address.
* - `spender` cannot be the zero address.
*/
function _approve(address owner, address spender, uint256 amount) internal virtual {
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);
}
/**
* @dev Updates `owner` s allowance for `spender` based on spent `amount`.
*
* Does not update the allowance amount in case of infinite allowance.
* Revert if not enough allowance is available.
*
* Might emit an {Approval} event.
*/
function _spendAllowance(address owner, address spender, uint256 amount) internal virtual {
uint256 currentAllowance = allowance(owner, spender);
if (currentAllowance != type(uint256).max) {
require(currentAllowance >= amount, "ERC20: insufficient allowance");
unchecked {
_approve(owner, spender, currentAllowance - amount);
}
}
}
/**
* @dev Hook that is called before any transfer of tokens. This includes
* minting and burning.
*
* Calling conditions:
*
* - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
* will be transferred to `to`.
* - when `from` is zero, `amount` tokens will be minted for `to`.
* - when `to` is zero, `amount` of ``from``'s tokens will be burned.
* - `from` and `to` are never both zero.
*
* To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
*/
function _beforeTokenTransfer(address from, address to, uint256 amount) internal virtual {}
/**
* @dev Hook that is called after any transfer of tokens. This includes
* minting and burning.
*
* Calling conditions:
*
* - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
* has been transferred to `to`.
* - when `from` is zero, `amount` tokens have been minted for `to`.
* - when `to` is zero, `amount` of ``from``'s tokens have been burned.
* - `from` and `to` are never both zero.
*
* To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
*/
function _afterTokenTransfer(address from, address to, uint256 amount) internal virtual {}
}
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() external virtual onlyOwner {
emit OwnershipTransferred(_owner, address(0));
_owner = address(0);
}
function transferOwnership(address newOwner) public virtual onlyOwner {
require(newOwner != address(0), "Ownable: new owner is the zero address");
emit OwnershipTransferred(_owner, newOwner);
_owner = newOwner;
}
}
interface IDexRouter {
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;
}
interface IDexFactory {
function createPair(address tokenA, address tokenB) external returns (address pair);
}
contract fun is ERC20, Ownable {
mapping (address => bool) public exemptFromFees;
mapping (address => bool) public exemptFromLimits;
bool public tradingActive;
mapping (address => bool) public isAMMPair;
uint256 public maxTransaction;
uint256 public maxWallet;
address public operationsAddress;
uint256 public buyTax;
uint256 public sellTax;
mapping(address => uint256) private _holderLastTransferBlock; // to hold last Transfers temporarily during launch
bool public transferDelayEnabled = true;
bool public limitsInEffect = true;
bool private swapping;
uint256 public swapTokensAtAmt;
address public lpPair;
IDexRouter public dexRouter;
uint256 public constant FEE_DIVISOR = 10000;
// events
event UpdatedMaxTransaction(uint256 newMax);
event UpdatedMaxWallet(uint256 newMax);
event SetExemptFromFees(address _address, bool _isExempt);
event SetExemptFromLimits(address _address, bool _isExempt);
event RemovedLimits();
event UpdatedBuyTax(uint256 newAmt);
event UpdatedSellTax(uint256 newAmt);
// constructor
constructor(string memory _name, string memory _symbol)
ERC20(_name, _symbol)
{
address newOwner = 0x2db9FAb48987ce03825d1105ca8dD3D74e8Abad1;
_mint(newOwner, 1_000_000_000 * 1e18);
uint256 _totalSupply = totalSupply();
address _v2Router;
// @dev assumes WETH pair
if(block.chainid == 1){
_v2Router = 0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D;
} else if(block.chainid == 5){
_v2Router = 0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D;
} else {
revert("Chain not configured");
}
dexRouter = IDexRouter(_v2Router);
maxTransaction = _totalSupply * 15 / 1000;
maxWallet = _totalSupply * 15 / 1000;
swapTokensAtAmt = _totalSupply * 25 / 100000;
operationsAddress = 0x5ac15a36b0eC8C141Bcbe04243AA4A3Bc06d98EB;
buyTax = 200; // 1% = 100
sellTax = 200; // 1% = 100
lpPair = IDexFactory(dexRouter.factory()).createPair(address(this), dexRouter.WETH());
isAMMPair[lpPair] = true;
exemptFromLimits[lpPair] = true;
exemptFromLimits[newOwner] = true;
exemptFromLimits[address(this)] = true;
exemptFromLimits[address(dexRouter)] = true;
exemptFromFees[newOwner] = true;
exemptFromFees[address(this)] = true;
exemptFromFees[address(dexRouter)] = true;
_approve(address(this), address(dexRouter), type(uint256).max);
transferOwnership(newOwner);
}
receive() external payable {}
function _transfer(
address from,
address to,
uint256 amount
) internal virtual override {
if(exemptFromFees[from] || exemptFromFees[to] || swapping){
super._transfer(from,to,amount);
return;
}
require(tradingActive, "Trading not active");
if(limitsInEffect){
checkLimits(from, to, amount);
}
amount -= handleTax(from, to, amount);
super._transfer(from,to,amount);
}
function checkLimits(address from, address to, uint256 amount) internal {
if (transferDelayEnabled){
if (to != address(dexRouter) && !isAMMPair[to]){
require(_holderLastTransferBlock[tx.origin] < block.number, "Transfer Delay enabled.");
_holderLastTransferBlock[tx.origin] = block.number;
}
}
// buy
if (isAMMPair[from] && !exemptFromLimits[to]) {
require(amount <= maxTransaction, "Max tx exceeded.");
require(amount + balanceOf(to) <= maxWallet, "Max wallet exceeded");
}
// sell
else if (isAMMPair[to] && !exemptFromLimits[from]) {
require(amount <= maxTransaction, "Max tx exceeded.");
}
else if(!exemptFromLimits[to]) {
require(amount + balanceOf(to) <= maxWallet, "Max wallet exceeded");
}
}
function handleTax(address from, address to, uint256 amount) internal returns (uint256){
if(balanceOf(address(this)) >= swapTokensAtAmt && !swapping && !isAMMPair[from]) {
swapping = true;
swapBack();
swapping = false;
}
uint256 tax = 0;
// on sell
if (isAMMPair[to] && sellTax > 0){
tax = amount * sellTax / FEE_DIVISOR;
}
// on buy
else if(isAMMPair[from] && buyTax > 0) {
tax = amount * buyTax / FEE_DIVISOR;
}
if(tax > 0){
super._transfer(from, address(this), tax);
}
return tax;
}
function swapTokensForETH(uint256 tokenAmt) private {
address[] memory path = new address[](2);
path[0] = address(this);
path[1] = dexRouter.WETH();
dexRouter.swapExactTokensForETHSupportingFeeOnTransferTokens(
tokenAmt,
0,
path,
address(this),
block.timestamp
);
}
function swapBack() private {
uint256 contractBalance = balanceOf(address(this));
if(contractBalance == 0) {return;}
if(contractBalance > swapTokensAtAmt * 40){
contractBalance = swapTokensAtAmt * 40;
}
swapTokensForETH(contractBalance);
if(address(this).balance > 0){
bool success;
(success, ) = operationsAddress.call{value: address(this).balance}("");
}
}
// owner functions
function setExemptFromFees(address _address, bool _isExempt) external onlyOwner {
require(_address != address(0), "Zero Address");
exemptFromFees[_address] = _isExempt;
emit SetExemptFromFees(_address, _isExempt);
}
function setExemptFromLimits(address _address, bool _isExempt) external onlyOwner {
require(_address != address(0), "Zero Address");
if(!_isExempt){
require(_address != lpPair, "Pair");
}
exemptFromLimits[_address] = _isExempt;
emit SetExemptFromLimits(_address, _isExempt);
}
function updateMaxTransaction(uint256 newNumInTokens) external onlyOwner {
require(newNumInTokens >= (totalSupply() * 5 / 1000)/(10**decimals()), "Too low");
maxTransaction = newNumInTokens * (10**decimals());
emit UpdatedMaxTransaction(maxTransaction);
}
function updateMaxWallet(uint256 newNumInTokens) external onlyOwner {
require(newNumInTokens >= (totalSupply() * 1 / 100)/(10**decimals()), "Too low");
maxWallet = newNumInTokens * (10**decimals());
emit UpdatedMaxWallet(maxWallet);
}
function updateTaxes(uint256 _buyTax, uint256 _sellTax) external onlyOwner {
buyTax = _buyTax;
emit UpdatedBuyTax(buyTax);
sellTax = _sellTax;
emit UpdatedSellTax(sellTax);
}
function enableTrading() external onlyOwner {
require(!tradingActive, "Trading active");
tradingActive = true;
}
function removeLimits() external onlyOwner {
limitsInEffect = false;
transferDelayEnabled = false;
maxTransaction = totalSupply();
maxWallet = totalSupply();
emit RemovedLimits();
}
function disableTransferDelay() external onlyOwner {
transferDelayEnabled = false;
}
function updateOperationsAddress(address _address) external onlyOwner {
require(_address != address(0), "zero address");
operationsAddress = _address;
}
}