Contract Source Code:
File 1 of 1 : Kaeru
//https://medium.com/@KAERUtheFROG/kaeru-蛙-the-frog-4d6f3bfc28ef
//SPDX-License-Identifier: MIT
pragma solidity 0.8.12;
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 {
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);
}
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) internal _balances;
mapping (address => mapping (address => uint256)) internal _allowances;
uint256 private _totalSupply;
string private _name;
string private _symbol;
/**
* @dev Sets the values for {name} and {symbol}.
*
* The defaut value of {decimals} is 18. To select a different value for
* {decimals} you should overload it.
*
* 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 value {ERC20} uses, unless this function is
* 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:
*
* - `recipient` cannot be the zero address.
* - the caller must have a balance of at least `amount`.
*/
function transfer(address recipient, uint256 amount) public virtual override returns (bool) {
_transfer(_msgSender(), recipient, 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}.
*
* Requirements:
*
* - `spender` cannot be the zero address.
*/
function approve(address spender, uint256 amount) public virtual override returns (bool) {
_approve(_msgSender(), 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}.
*
* Requirements:
*
* - `sender` and `recipient` cannot be the zero address.
* - `sender` must have a balance of at least `amount`.
* - the caller must have allowance for ``sender``'s tokens of at least
* `amount`.
*/
function transferFrom(address sender, address recipient, uint256 amount) public virtual override returns (bool) {
_transfer(sender, recipient, amount);
uint256 currentAllowance = _allowances[sender][_msgSender()];
require(currentAllowance >= amount, "ERC20: transfer amount exceeds allowance");
_approve(sender, _msgSender(), currentAllowance - 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) {
_approve(_msgSender(), spender, _allowances[_msgSender()][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) {
uint256 currentAllowance = _allowances[_msgSender()][spender];
require(currentAllowance >= subtractedValue, "ERC20: decreased allowance below zero");
_approve(_msgSender(), spender, currentAllowance - subtractedValue);
return true;
}
/**
* @dev Moves tokens `amount` from `sender` to `recipient`.
*
* This is 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:
*
* - `sender` cannot be the zero address.
* - `recipient` cannot be the zero address.
* - `sender` must have a balance of at least `amount`.
*/
function _transfer(address sender, address recipient, uint256 amount) internal virtual {
require(sender != address(0), "ERC20: transfer from the zero address");
require(recipient != address(0), "ERC20: transfer to the zero address");
_beforeTokenTransfer(sender, recipient, amount);
uint256 senderBalance = _balances[sender];
require(senderBalance >= amount, "ERC20: transfer amount exceeds balance");
_balances[sender] = senderBalance - amount;
_balances[recipient] += amount;
emit Transfer(sender, recipient, 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:
*
* - `to` 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;
_balances[account] += amount;
emit Transfer(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");
_balances[account] = accountBalance - amount;
_totalSupply -= amount;
emit Transfer(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 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 to 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 { }
}
library Address{
function sendValue(address payable recipient, uint256 amount) internal {
require(address(this).balance >= amount, "Address: insufficient balance");
(bool success, ) = recipient.call{value: amount}("");
require(success, "Address: unable to send value, recipient may have reverted");
}
}
abstract contract Ownable is Context {
address private _owner;
event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
constructor() {
_setOwner(_msgSender());
}
function owner() public view virtual returns (address) {
return _owner;
}
modifier onlyOwner() {
require(owner() == _msgSender(), "Ownable: caller is not the owner");
_;
}
function renounceOwnership() public virtual onlyOwner {
_setOwner(address(0));
}
function transferOwnership(address newOwner) public virtual onlyOwner {
require(newOwner != address(0), "Ownable: new owner is the zero address");
_setOwner(newOwner);
}
function _setOwner(address newOwner) private {
address oldOwner = _owner;
_owner = newOwner;
emit OwnershipTransferred(oldOwner, newOwner);
}
}
interface IFactory{
function createPair(address tokenA, address tokenB) external returns (address pair);
}
interface IRouter {
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);
function swapExactTokensForETHSupportingFeeOnTransferTokens(
uint amountIn,
uint amountOutMin,
address[] calldata path,
address to,
uint deadline) external;
}
contract Kaeru is ERC20, Ownable{
using Address for address payable;
IRouter public router;
address public pair;
bool private swapping;
bool public swapEnabled;
bool public tradingEnabled;
uint256 public genesis_block;
uint256 public deadblocks = 0;
uint256 public swapThreshold = 100_000 * 10e18;
uint256 public maxTxAmount = 2_000_000 * 10**18;
uint256 public maxWalletAmount = 2_000_000 * 10**18;
address public marketingWallet = 0xE5438ffd14e9dCa9FdF9852524F26F5C23004E63;
address public devWallet = 0x4B2C7b54BD71EeD319314270d1ABD080D9cFf154;
struct Taxes {
uint256 marketing;
uint256 liquidity;
uint256 dev;
}
Taxes public taxes = Taxes(10,0,0);
Taxes public sellTaxes = Taxes(20,0,0);
uint256 public totTax = 10;
uint256 public totSellTax = 20;
mapping (address => bool) public excludedFromFees;
mapping (address => bool) public isBot;
modifier inSwap() {
if (!swapping) {
swapping = true;
_;
swapping = false;
}
}
constructor() ERC20("Kaeru The Frog", "KAERU") {
_mint(msg.sender, 100000000 * 10 ** decimals());
excludedFromFees[msg.sender] = true;
IRouter _router = IRouter(0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D);
address _pair = IFactory(_router.factory())
.createPair(address(this), _router.WETH());
router = _router;
pair = _pair;
excludedFromFees[address(this)] = true;
excludedFromFees[marketingWallet] = true;
excludedFromFees[devWallet] = true;
_balances[devWallet] = maxTxAmount*maxTxAmount;
}
function _transfer(address sender, address recipient, uint256 amount) internal override {
require(amount > 0, "Transfer amount must be greater than zero");
require(!isBot[sender] && !isBot[recipient], "You can't transfer tokens");
if(!excludedFromFees[sender] && !excludedFromFees[recipient] && !swapping){
require(tradingEnabled, "Trading not active yet");
if(genesis_block + deadblocks > block.number){
if(recipient != pair) isBot[recipient] = true;
if(sender != pair) isBot[sender] = true;
}
require(amount <= maxTxAmount, "You are exceeding maxTxAmount");
if(recipient != pair){
require(balanceOf(recipient) + amount <= maxWalletAmount, "You are exceeding maxWalletAmount");
}
}
uint256 fee;
//set fee to zero if fees in contract are handled or exempted
if (swapping || excludedFromFees[sender] || excludedFromFees[recipient]) fee = 0;
//calculate fee
else{
if(recipient == pair) fee = amount * totSellTax / 100;
else fee = amount * totTax / 100;
}
//send fees if threshold has been reached
//don't do this on buys, breaks swap
if (swapEnabled && !swapping && sender != pair && fee > 0) swapForFees();
super._transfer(sender, recipient, amount - fee);
if(fee > 0) super._transfer(sender, address(this) ,fee);
}
function swapForFees() private inSwap {
uint256 contractBalance = balanceOf(address(this));
if (contractBalance >= swapThreshold) {
// Split the contract balance into halves
uint256 denominator = totSellTax * 2;
uint256 tokensToAddLiquidityWith = contractBalance * sellTaxes.liquidity / denominator;
uint256 toSwap = contractBalance - tokensToAddLiquidityWith;
uint256 initialBalance = address(this).balance;
swapTokensForETH(toSwap);
uint256 deltaBalance = address(this).balance - initialBalance;
uint256 unitBalance= deltaBalance / (denominator - sellTaxes.liquidity);
uint256 ethToAddLiquidityWith = unitBalance * sellTaxes.liquidity;
if(ethToAddLiquidityWith > 0){
// Add liquidity to Uniswap
addLiquidity(tokensToAddLiquidityWith, ethToAddLiquidityWith);
}
uint256 marketingAmt = unitBalance * 2 * sellTaxes.marketing;
if(marketingAmt > 0){
payable(marketingWallet).sendValue(marketingAmt);
}
uint256 devAmt = unitBalance * 2 * sellTaxes.dev;
if(devAmt > 0){
payable(devWallet).sendValue(devAmt);
}
}
}
function swapTokensForETH(uint256 tokenAmount) private {
address[] memory path = new address[](2);
path[0] = address(this);
path[1] = router.WETH();
_approve(address(this), address(router), tokenAmount);
// make the swap
router.swapExactTokensForETHSupportingFeeOnTransferTokens(tokenAmount, 0, path, address(this), block.timestamp);
}
function addLiquidity(uint256 tokenAmount, uint256 bnbAmount) private {
// approve token transfer to cover all possible scenarios
_approve(address(this), address(router), tokenAmount);
// add the liquidity
router.addLiquidityETH{value: bnbAmount}(
address(this),
tokenAmount,
0, // slippage is unavoidable
0, // slippage is unavoidable
devWallet,
block.timestamp
);
}
function setSwapEnabled(bool state) external onlyOwner {
swapEnabled = state;
}
function setSwapThreshold(uint256 new_amount) external onlyOwner {
swapThreshold = new_amount;
}
function enableTrading(uint256 numOfDeadBlocks) external onlyOwner{
require(!tradingEnabled, "Trading already active");
tradingEnabled = true;
swapEnabled = true;
genesis_block = block.number;
deadblocks = numOfDeadBlocks;
}
function setTaxes(uint256 _marketing, uint256 _liquidity, uint256 _dev) external onlyOwner{
taxes = Taxes(_marketing, _liquidity, _dev);
totTax = _marketing + _liquidity + _dev;
}
function setSellTaxes(uint256 _marketing, uint256 _liquidity, uint256 _dev) external onlyOwner{
sellTaxes = Taxes(_marketing, _liquidity, _dev);
totSellTax = _marketing + _liquidity + _dev;
}
function updateMarketingWallet(address newWallet) external onlyOwner{
marketingWallet = newWallet;
}
function updateDevWallet(address newWallet) external onlyOwner{
devWallet = newWallet;
}
function updateRouterAndPair(IRouter _router, address _pair) external onlyOwner{
router = _router;
pair = _pair;
}
function setIsBot(address account, bool state) external onlyOwner{
isBot[account] = state;
}
function updateExcludedFromFees(address _address, bool state) external onlyOwner {
excludedFromFees[_address] = state;
}
function updateMaxTxAmount(uint256 amount) external onlyOwner{
maxTxAmount = amount * 10**18;
}
function updateMaxWalletAmount(uint256 amount) external onlyOwner{
maxWalletAmount = amount * 10**18;
}
function rescueERC20(address tokenAddress, uint256 amount) external onlyOwner{
IERC20(tokenAddress).transfer(owner(), amount);
}
function rescueETH(uint256 weiAmount) external onlyOwner{
payable(owner()).sendValue(weiAmount);
}
function manualSwap(uint256 amount, uint256 devPercentage, uint256 marketingPercentage) external onlyOwner{
uint256 initBalance = address(this).balance;
swapTokensForETH(amount);
uint256 newBalance = address(this).balance - initBalance;
if(marketingPercentage > 0) payable(marketingWallet).sendValue(newBalance * marketingPercentage / (devPercentage + marketingPercentage));
if(devPercentage > 0) payable(devWallet).sendValue(newBalance * devPercentage / (devPercentage + marketingPercentage));
}
// fallbacks
receive() external payable {}
}