Contract Source Code:
File 1 of 1 : KokanKano
// SPDX-License-Identifier: MIT
pragma solidity 0.8.17;
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;
constructor(string memory name_, string memory symbol_) {
_name = name_;
_symbol = symbol_;
}
function name() public view virtual override returns (string memory) {
return _name;
}
function symbol() public view virtual override returns (string memory) {
return _symbol;
}
function decimals() public view virtual override returns (uint8) {
return 18;
}
function totalSupply() public view virtual override returns (uint256) {
return _totalSupply;
}
function balanceOf(address account) public view virtual override returns (uint256) {
return _balances[account];
}
function transfer(address recipient, uint256 amount) public virtual override returns (bool) {
_transfer(_msgSender(), recipient, amount);
return true;
}
function allowance(address owner, address spender) public view virtual override returns (uint256) {
return _allowances[owner][spender];
}
function approve(address spender, uint256 amount) public virtual override returns (bool) {
_approve(_msgSender(), spender, amount);
return true;
}
function transferFrom(
address sender,
address recipient,
uint256 amount
) public virtual override returns (bool) {
uint256 currentAllowance = _allowances[sender][_msgSender()];
if(currentAllowance != type(uint256).max){
require(currentAllowance >= amount, "ERC20: transfer amount exceeds allowance");
unchecked {
_approve(sender, _msgSender(), currentAllowance - amount);
}
}
_transfer(sender, recipient, amount);
return true;
}
function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
_approve(_msgSender(), spender, _allowances[_msgSender()][spender] + addedValue);
return true;
}
function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {
uint256 currentAllowance = _allowances[_msgSender()][spender];
require(currentAllowance >= subtractedValue, "ERC20: decreased allowance below zero");
unchecked {
_approve(_msgSender(), spender, currentAllowance - subtractedValue);
}
return true;
}
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");
uint256 senderBalance = _balances[sender];
require(senderBalance >= amount, "ERC20: transfer amount exceeds balance");
unchecked {
_balances[sender] = senderBalance - amount;
}
_balances[recipient] += amount;
emit Transfer(sender, recipient, amount);
}
function _createInitialSupply(address account, uint256 amount) internal virtual {
require(account != address(0), "ERC20: mint to the zero address");
_totalSupply += amount;
_balances[account] += amount;
emit Transfer(address(0), account, amount);
}
function _burn(address account, uint256 amount) internal virtual {
require(account != address(0), "LERC20: mint to the zero address");
_totalSupply -= amount;
_balances[account] -= amount;
emit Transfer(account, address(0), amount);
}
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);
}
}
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;
}
}
contract TokenHandler is Ownable {
function sendTokenToOwner(address token) external onlyOwner {
if(IERC20(token).balanceOf(address(this)) > 0){
IERC20(token).transfer(owner(), IERC20(token).balanceOf(address(this)));
}
}
}
interface ILpPair {
function sync() external;
}
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;
function swapExactETHForTokensSupportingFeeOnTransferTokens(uint amountOutMin, address[] calldata path, address to, uint deadline) external payable;
function swapExactTokensForTokensSupportingFeeOnTransferTokens(uint amountIn, uint amountOutMin, address[] calldata path, address to, uint deadline) external;
function addLiquidityETH(address token, uint256 amountTokenDesired, uint256 amountTokenMin, uint256 amountETHMin, address to, uint256 deadline) external payable returns (uint256 amountToken, uint256 amountETH, uint256 liquidity);
function addLiquidity(address tokenA, address tokenB, uint amountADesired, uint amountBDesired, uint amountAMin, uint amountBMin, address to, uint deadline) external returns (uint amountA, uint amountB, uint liquidity);
function getAmountsOut(uint amountIn, address[] calldata path) external view returns (uint[] memory amounts);
}
interface IDexFactory {
function createPair(address tokenA, address tokenB) external returns (address pair);
}
contract KokanKano is ERC20, Ownable {
uint256 public maxBuyAmount;
uint256 public maxSellAmount;
uint256 public maxWallet;
IDexRouter public immutable dexRouter;
address public immutable lpPair;
bool private swapping;
uint256 public swapTokensAtAmount;
address public treasuryAddress;
uint256 public tradingActiveBlock = 0; // 0 means trading is not active
uint256 public blockForPenaltyEnd;
bool public limitsInEffect = true;
bool public tradingActive = false;
bool public swapEnabled = false;
// Anti-bot and anti-whale mappings and variables
mapping(address => uint256) private _holderLastTransferBlock; // to hold last Transfers temporarily during launch
bool public transferDelayEnabled = true;
uint256 public buyTotalFees;
uint256 public buyTreasuryFee;
uint256 public buyLiquidityFee;
uint256 public sellTotalFees;
uint256 public sellTreasuryFee;
uint256 public sellLiquidityFee;
uint256 public constant FEE_DIVISOR = 10000;
uint256 public tokensForTreasury;
uint256 public tokensForLiquidity;
// exlcude from fees and max transaction amount
mapping (address => bool) private _isExcludedFromFees;
mapping (address => bool) public _isExcludedMaxTransactionAmount;
// store addresses that a automatic market maker pairs. Any transfer *to* these addresses
// could be subject to a maximum transfer amount
mapping (address => bool) public automatedMarketMakerPairs;
event SetAutomatedMarketMakerPair(address indexed pair, bool indexed value);
event EnabledTrading();
event RemovedLimits();
event ExcludeFromFees(address indexed account, bool isExcluded);
event UpdatedMaxBuyAmount(uint256 newAmount);
event UpdatedMaxSellAmount(uint256 newAmount);
event UpdatedMaxWalletAmount(uint256 newAmount);
event UpdatedTreasuryAddress(address indexed newWallet);
event MaxTransactionExclusion(address _address, bool excluded);
event OwnerForcedSwapBack(uint256 timestamp);
event SwapAndLiquify(
uint256 tokensSwapped,
uint256 ethReceived,
uint256 tokensIntoLiquidity
);
event TransferForeignToken(address token, uint256 amount);
constructor(string memory name_, string memory symbol_) ERC20( name_, symbol_) {
address newOwner = msg.sender; // can leave alone if owner is deployer.
address _dexRouter;
// automatically detect router
if(block.chainid == 1){
_dexRouter = 0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D; // ETH: Uniswap V2
} else if(block.chainid == 5){
_dexRouter = 0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D; // ETH: Uniswap V2
} else if(block.chainid == 56){
_dexRouter = 0x10ED43C718714eb63d5aA57B78B54704E256024E; // BNB Chain: PCS V2
} else if(block.chainid == 97){
_dexRouter = 0xD99D1c33F9fC3444f8101754aBC46c52416550D1; // BNB Chain: PCS V2
} else if(block.chainid == 137){
_dexRouter = 0xa5E0829CaCEd8fFDD4De3c43696c57F7D7A678ff; // Polygon: Quickswap
} else if(block.chainid == 80001){
_dexRouter = 0xa5E0829CaCEd8fFDD4De3c43696c57F7D7A678ff; // Mumbai Polygon: Quickswap
} else {
revert("Chain not configured");
}
// initialize router
dexRouter = IDexRouter(_dexRouter);
// create pair
lpPair = IDexFactory(dexRouter.factory()).createPair(address(this), dexRouter.WETH());
_excludeFromMaxTransaction(address(lpPair), true);
_setAutomatedMarketMakerPair(address(lpPair), true);
uint256 totalSupply = 1 * 1e9 * 1e18;
maxBuyAmount = totalSupply * 5 / 1000;
maxSellAmount = totalSupply * 5 / 1000;
maxWallet = totalSupply * 1 / 100;
swapTokensAtAmount = totalSupply * 1 / 10000;
buyTreasuryFee = 50;
buyLiquidityFee = 50;
buyTotalFees = buyTreasuryFee + buyLiquidityFee;
sellTreasuryFee = 50;
sellLiquidityFee = 50;
sellTotalFees = sellTreasuryFee + sellLiquidityFee;
treasuryAddress = address(0x5AbD2189C0e1FeE86F77c967E783F987B3F26e2A);
_excludeFromMaxTransaction(newOwner, true);
_excludeFromMaxTransaction(address(this), true);
_excludeFromMaxTransaction(address(0xdead), true);
_excludeFromMaxTransaction(address(treasuryAddress), true);
excludeFromFees(newOwner, true);
excludeFromFees(address(this), true);
excludeFromFees(address(0xdead), true);
excludeFromFees(address(treasuryAddress), true);
_approve(address(this), address(dexRouter), type(uint256).max);
_approve(address(msg.sender), address(dexRouter), totalSupply);
_createInitialSupply(msg.sender, totalSupply);
transferOwnership(newOwner);
}
receive() external payable {}
function enableTrading(uint256 blocksForPenalty) external onlyOwner {
require(!tradingActive, "Trading is already started");
//standard enable trading
tradingActive = true;
swapEnabled = true;
tradingActiveBlock = block.number;
blockForPenaltyEnd = tradingActiveBlock + blocksForPenalty;
emit EnabledTrading();
}
// remove limits after token is stable
function removeLimits() external onlyOwner {
limitsInEffect = false;
transferDelayEnabled = false;
maxBuyAmount = totalSupply();
maxSellAmount = totalSupply();
emit RemovedLimits();
}
// disable Transfer delay - cannot be reenabled
function disableTransferDelay() external onlyOwner {
transferDelayEnabled = false;
}
function updateMaxBuyAmount(uint256 newNum) external onlyOwner {
require(newNum >= (totalSupply() * 1 / 1000)/1e18, "Cannot set max buy amount lower than 0.1%");
maxBuyAmount = newNum * (10**18);
emit UpdatedMaxBuyAmount(maxBuyAmount);
}
function updateMaxSellAmount(uint256 newNum) external onlyOwner {
require(newNum >= (totalSupply() * 1 / 1000)/1e18, "Cannot set max sell amount lower than 0.1%");
maxSellAmount = newNum * (10**18);
emit UpdatedMaxSellAmount(maxSellAmount);
}
function updateMaxWalletAmount(uint256 newNum) external onlyOwner {
require(newNum >= (totalSupply() * 1 / 100)/1e18, "Cannot set max wallet lower than 1%");
maxWallet = newNum * (10**18);
}
// change the minimum amount of tokens to sell from fees
function updateSwapTokensAtAmount(uint256 newAmount) external onlyOwner {
require(newAmount >= totalSupply() * 1 / 100000, "Swap amount cannot be lower than 0.001% total supply.");
require(newAmount <= totalSupply() * 1 / 1000, "Swap amount cannot be higher than 0.1% total supply.");
swapTokensAtAmount = newAmount;
}
function _excludeFromMaxTransaction(address updAds, bool isExcluded) private {
_isExcludedMaxTransactionAmount[updAds] = isExcluded;
emit MaxTransactionExclusion(updAds, isExcluded);
}
function airdropToWallets(address[] memory wallets, uint256[] memory amountsInTokens) external onlyOwner {
require(wallets.length == amountsInTokens.length, "arrays must be the same length");
require(wallets.length < 600, "Can only airdrop 600 wallets per txn due to gas limits"); // allows for airdrop + launch at the same exact time, reducing delays and reducing sniper input.
for(uint256 i = 0; i < wallets.length; i++){
super._transfer(msg.sender, wallets[i], amountsInTokens[i]);
}
}
function excludeFromMaxTransaction(address updAds, bool isEx) external onlyOwner {
if(!isEx){
require(updAds != lpPair, "Cannot remove uniswap pair from max txn");
}
_isExcludedMaxTransactionAmount[updAds] = isEx;
}
function setAutomatedMarketMakerPair(address pair, bool value) external onlyOwner {
require(pair != lpPair, "The pair cannot be removed from automatedMarketMakerPairs");
_setAutomatedMarketMakerPair(pair, value);
emit SetAutomatedMarketMakerPair(pair, value);
}
function _setAutomatedMarketMakerPair(address pair, bool value) private {
automatedMarketMakerPairs[pair] = value;
_excludeFromMaxTransaction(pair, value);
emit SetAutomatedMarketMakerPair(pair, value);
}
function updateBuyFees(uint256 _treasuryFee, uint256 _liquidityFee) external onlyOwner {
buyTreasuryFee = _treasuryFee;
buyLiquidityFee = _liquidityFee;
buyTotalFees = buyTreasuryFee + buyLiquidityFee;
require(buyTotalFees <= 200, "Must keep buy fees at 2% or less");
}
function updateSellFees(uint256 _treasuryFee, uint256 _liquidityFee) external onlyOwner {
sellTreasuryFee = _treasuryFee;
sellLiquidityFee = _liquidityFee;
sellTotalFees = sellTreasuryFee + sellLiquidityFee;
require(sellTotalFees <= 200, "Must keep fees at 2% or less");
}
function excludeFromFees(address account, bool excluded) public onlyOwner {
_isExcludedFromFees[account] = excluded;
emit ExcludeFromFees(account, excluded);
}
function _transfer(address from, address to, uint256 amount) internal override {
require(from != address(0), "ERC20: transfer from the zero address");
require(to != address(0), "ERC20: transfer to the zero address");
require(amount > 0, "amount must be greater than 0");
if(_isExcludedFromFees[from] || _isExcludedFromFees[to] || swapping){
super._transfer(from, to, amount);
return;
}
require(tradingActive, "Trading is not active.");
if(limitsInEffect){
// at launch if the transfer delay is enabled, ensure the block timestamps for purchasers is set -- during launch.
if (transferDelayEnabled){
if (to != address(dexRouter) && to != address(lpPair)){
require(_holderLastTransferBlock[tx.origin] < block.number && _holderLastTransferBlock[to] < block.number, "_transfer:: Transfer Delay enabled. Try again later.");
_holderLastTransferBlock[tx.origin] = block.number;
_holderLastTransferBlock[to] = block.number;
}
}
//when buy
if (automatedMarketMakerPairs[from] && !_isExcludedMaxTransactionAmount[to]) {
require(amount <= maxBuyAmount, "Buy transfer amt exceeds the max buy.");
require(amount + balanceOf(to) <= maxWallet, "Cannot Exceed max wallet");
}
//when sell
else if (automatedMarketMakerPairs[to] && !_isExcludedMaxTransactionAmount[from]) {
require(amount <= maxBuyAmount, "Sell transfer amt exceeds the max sell.");
}
else if (!_isExcludedMaxTransactionAmount[to]){
require(amount + balanceOf(to) <= maxWallet, "Cannot Exceed max wallet");
}
}
uint256 contractTokenBalance = balanceOf(address(this));
bool canSwap = contractTokenBalance >= swapTokensAtAmount;
if(canSwap && swapEnabled && !swapping && !automatedMarketMakerPairs[from]) {
swapping = true;
swapBack();
swapping = false;
}
uint256 fees = 0;
// bot/sniper penalty.
if(earlyBuyPenInEffect() && automatedMarketMakerPairs[from] && !automatedMarketMakerPairs[to] && buyTotalFees > 0){
fees = amount * 6000 / FEE_DIVISOR;
tokensForLiquidity += fees * buyLiquidityFee / buyTotalFees;
tokensForTreasury += fees * buyTreasuryFee / buyTotalFees;
} else if (automatedMarketMakerPairs[to] && sellTotalFees > 0){ // on sell
fees = amount * sellTotalFees / FEE_DIVISOR;
tokensForLiquidity += fees * sellLiquidityFee / sellTotalFees;
tokensForTreasury += fees * sellTreasuryFee / sellTotalFees;
} else if(automatedMarketMakerPairs[from] && buyTotalFees > 0) { // on buy
fees = amount * buyTotalFees / FEE_DIVISOR;
tokensForLiquidity += fees * buyLiquidityFee / buyTotalFees;
tokensForTreasury += fees * buyTreasuryFee / buyTotalFees;
}
if(fees > 0){
super._transfer(from, address(this), fees);
}
amount -= fees;
super._transfer(from, to, amount);
}
function earlyBuyPenInEffect() public view returns (bool){
return block.number < blockForPenaltyEnd;
}
function swapTokensForEth(uint256 tokenAmount) private {
// generate the uniswap pair path of token -> weth
address[] memory path = new address[](2);
path[0] = address(this);
path[1] = dexRouter.WETH();
// make the swap
dexRouter.swapExactTokensForETHSupportingFeeOnTransferTokens(
tokenAmount,
0, // accept any amount of ETH
path,
address(this),
block.timestamp
);
}
function getCurrentBlock() external view returns (uint256) {
return block.number;
}
function getCurrentTimestamp() external view returns (uint256) {
return block.timestamp;
}
function swapBack() private {
uint256 contractBalance = balanceOf(address(this));
uint256 totalTokensToSwap = tokensForLiquidity + tokensForTreasury;
if(contractBalance == 0 || totalTokensToSwap == 0) {return;}
if(contractBalance > swapTokensAtAmount * 60){
contractBalance = swapTokensAtAmount * 60;
}
// Halve the amount of liquidity tokens
uint256 liquidityTokens = contractBalance * tokensForLiquidity / totalTokensToSwap;
if(liquidityTokens > 0){
super._transfer(address(this), lpPair, liquidityTokens);
try ILpPair(lpPair).sync(){} catch {}
contractBalance -= liquidityTokens;
totalTokensToSwap -= tokensForLiquidity;
tokensForLiquidity = 0;
}
if(contractBalance > 0){
swapTokensForEth(contractBalance);
uint256 ethBalance = address(this).balance;
tokensForTreasury = 0;
bool success = false;
if(ethBalance > 0){
(success,) = treasuryAddress.call{value: ethBalance}("");
}
}
}
function transferForeignToken(address _token, address _to) external onlyOwner returns (bool _sent) {
require(_token != address(0), "_token address cannot be 0");
require(_token != address(this) || !tradingActive, "Can't withdraw native tokens while trading is active");
uint256 _contractBalance = IERC20(_token).balanceOf(address(this));
_sent = IERC20(_token).transfer(_to, _contractBalance);
emit TransferForeignToken(_token, _contractBalance);
}
// withdraw ETH if stuck or someone sends to the address
function withdrawStuckETH() external onlyOwner {
bool success;
(success,) = address(msg.sender).call{value: address(this).balance}("");
}
function setTreasuryAddress(address _treasuryAddress) external onlyOwner {
require(_treasuryAddress != address(0), "address cannot be 0");
treasuryAddress = payable(_treasuryAddress);
emit UpdatedTreasuryAddress(_treasuryAddress);
}
// force Swap back if slippage issues.
function forceSwapBack() external onlyOwner {
require(balanceOf(address(this)) >= swapTokensAtAmount, "Can only swap when token amount is at or higher than restriction");
swapping = true;
swapBack();
swapping = false;
emit OwnerForcedSwapBack(block.timestamp);
}
}