Contract Source Code:
File 1 of 1 : DAVID
/**
*Submitted for verification at Etherscan.io on 2023-08-27
*/
pragma solidity 0.8.19;
/// @notice Modern and gas efficient ERC20 + EIP-2612 implementation.
/// @author Solmate (https://github.com/transmissions11/solmate/blob/main/src/tokens/ERC20.sol)
/// @author Modified from Uniswap (https://github.com/Uniswap/uniswap-v2-core/blob/master/contracts/UniswapV2ERC20.sol)
/// @dev Do not manually set balances without updating totalSupply, as the sum of all user balances must not exceed it.
abstract contract ERC20 {
/*//////////////////////////////////////////////////////////////
EVENTS
//////////////////////////////////////////////////////////////*/
event Transfer(address indexed from, address indexed to, uint256 amount);
event Approval(address indexed owner, address indexed spender, uint256 amount);
/*//////////////////////////////////////////////////////////////
METADATA STORAGE
//////////////////////////////////////////////////////////////*/
string public name;
string public symbol;
uint8 public immutable decimals;
/*//////////////////////////////////////////////////////////////
ERC20 STORAGE
//////////////////////////////////////////////////////////////*/
uint256 public totalSupply;
mapping(address => uint256) public balanceOf;
mapping(address => mapping(address => uint256)) public allowance;
/*//////////////////////////////////////////////////////////////
EIP-2612 STORAGE
//////////////////////////////////////////////////////////////*/
uint256 internal immutable INITIAL_CHAIN_ID;
bytes32 internal immutable INITIAL_DOMAIN_SEPARATOR;
mapping(address => uint256) public nonces;
/*//////////////////////////////////////////////////////////////
CONSTRUCTOR
//////////////////////////////////////////////////////////////*/
constructor(
string memory _name,
string memory _symbol,
uint8 _decimals
) {
name = _name;
symbol = _symbol;
decimals = _decimals;
INITIAL_CHAIN_ID = block.chainid;
INITIAL_DOMAIN_SEPARATOR = computeDomainSeparator();
}
/*//////////////////////////////////////////////////////////////
ERC20 LOGIC
//////////////////////////////////////////////////////////////*/
function approve(address spender, uint256 amount) public virtual returns (bool) {
allowance[msg.sender][spender] = amount;
emit Approval(msg.sender, spender, amount);
return true;
}
function transfer(address to, uint256 amount) public virtual returns (bool) {
balanceOf[msg.sender] -= amount;
// Cannot overflow because the sum of all user
// balances can't exceed the max uint256 value.
unchecked {
balanceOf[to] += amount;
}
emit Transfer(msg.sender, to, amount);
return true;
}
function transferFrom(
address from,
address to,
uint256 amount
) public virtual returns (bool) {
uint256 allowed = allowance[from][msg.sender]; // Saves gas for limited approvals.
if (allowed != type(uint256).max) allowance[from][msg.sender] = allowed - amount;
balanceOf[from] -= amount;
// Cannot overflow because the sum of all user
// balances can't exceed the max uint256 value.
unchecked {
balanceOf[to] += amount;
}
emit Transfer(from, to, amount);
return true;
}
/*//////////////////////////////////////////////////////////////
EIP-2612 LOGIC
//////////////////////////////////////////////////////////////*/
function permit(
address owner,
address spender,
uint256 value,
uint256 deadline,
uint8 v,
bytes32 r,
bytes32 s
) public virtual {
require(deadline >= block.timestamp, "PERMIT_DEADLINE_EXPIRED");
// Unchecked because the only math done is incrementing
// the owner's nonce which cannot realistically overflow.
unchecked {
address recoveredAddress = ecrecover(
keccak256(
abi.encodePacked(
"\x19\x01",
DOMAIN_SEPARATOR(),
keccak256(
abi.encode(
keccak256(
"Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)"
),
owner,
spender,
value,
nonces[owner]++,
deadline
)
)
)
),
v,
r,
s
);
require(recoveredAddress != address(0) && recoveredAddress == owner, "INVALID_SIGNER");
allowance[recoveredAddress][spender] = value;
}
emit Approval(owner, spender, value);
}
function DOMAIN_SEPARATOR() public view virtual returns (bytes32) {
return block.chainid == INITIAL_CHAIN_ID ? INITIAL_DOMAIN_SEPARATOR : computeDomainSeparator();
}
function computeDomainSeparator() internal view virtual returns (bytes32) {
return
keccak256(
abi.encode(
keccak256("EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)"),
keccak256(bytes(name)),
keccak256("1"),
block.chainid,
address(this)
)
);
}
/*//////////////////////////////////////////////////////////////
INTERNAL MINT/BURN LOGIC
//////////////////////////////////////////////////////////////*/
function _mint(address to, uint256 amount) internal virtual {
totalSupply += amount;
// Cannot overflow because the sum of all user
// balances can't exceed the max uint256 value.
unchecked {
balanceOf[to] += amount;
}
emit Transfer(address(0), to, amount);
}
function _burn(address from, uint256 amount) internal virtual {
balanceOf[from] -= amount;
// Cannot underflow because a user's balance
// will never be larger than the total supply.
unchecked {
totalSupply -= amount;
}
emit Transfer(from, address(0), amount);
}
}
// OpenZeppelin Contracts (last updated v4.7.0) (access/Ownable.sol)
// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)
/**
* @dev Provides information about the current execution context, including the
* sender of the transaction and its data. While these are generally available
* via msg.sender and msg.data, they should not be accessed in such a direct
* manner, since when dealing with meta-transactions the account sending and
* paying for execution may not be the actual sender (as far as an application
* is concerned).
*
* This contract is only required for intermediate, library-like contracts.
*/
abstract contract Context {
function _msgSender() internal view virtual returns (address) {
return msg.sender;
}
function _msgData() internal view virtual returns (bytes calldata) {
return msg.data;
}
}
/**
* @dev Contract module which provides a basic access control mechanism, where
* there is an account (an owner) that can be granted exclusive access to
* specific functions.
*
* By default, the owner account will be the one that deploys the contract. This
* can later be changed with {transferOwnership}.
*
* This module is used through inheritance. It will make available the modifier
* `onlyOwner`, which can be applied to your functions to restrict their use to
* the owner.
*/
abstract contract Ownable is Context {
address private _owner;
event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
/**
* @dev Initializes the contract setting the deployer as the initial owner.
*/
constructor() {
_transferOwnership(_msgSender());
}
/**
* @dev Throws if called by any account other than the owner.
*/
modifier onlyOwner() {
_checkOwner();
_;
}
/**
* @dev Returns the address of the current owner.
*/
function owner() public view virtual returns (address) {
return _owner;
}
/**
* @dev Throws if the sender is not the owner.
*/
function _checkOwner() internal view virtual {
require(owner() == _msgSender(), "Ownable: caller is not the owner");
}
/**
* @dev Leaves the contract without owner. It will not be possible to call
* `onlyOwner` functions anymore. Can only be called by the current owner.
*
* NOTE: Renouncing ownership will leave the contract without an owner,
* thereby removing any functionality that is only available to the owner.
*/
function renounceOwnership() public virtual onlyOwner {
_transferOwnership(address(0));
}
/**
* @dev Transfers ownership of the contract to a new account (`newOwner`).
* Can only be called by the current owner.
*/
function transferOwnership(address newOwner) public virtual onlyOwner {
require(newOwner != address(0), "Ownable: new owner is the zero address");
_transferOwnership(newOwner);
}
/**
* @dev Transfers ownership of the contract to a new account (`newOwner`).
* Internal function without access restriction.
*/
function _transferOwnership(address newOwner) internal virtual {
address oldOwner = _owner;
_owner = newOwner;
emit OwnershipTransferred(oldOwner, newOwner);
}
}
interface IUniswapV2Factory {
event PairCreated(address indexed token0, address indexed token1, address pair, uint);
function feeTo() external view returns (address);
function feeToSetter() external view returns (address);
function getPair(address tokenA, address tokenB) external view returns (address pair);
function allPairs(uint) external view returns (address pair);
function allPairsLength() external view returns (uint);
function createPair(address tokenA, address tokenB) external returns (address pair);
function setFeeTo(address) external;
function setFeeToSetter(address) external;
}
interface IUniswapV2Pair {
event Approval(address indexed owner, address indexed spender, uint value);
event Transfer(address indexed from, address indexed to, uint value);
function name() external pure returns (string memory);
function symbol() external pure returns (string memory);
function decimals() external pure returns (uint8);
function totalSupply() external view returns (uint);
function balanceOf(address owner) external view returns (uint);
function allowance(address owner, address spender) external view returns (uint);
function approve(address spender, uint value) external returns (bool);
function transfer(address to, uint value) external returns (bool);
function transferFrom(address from, address to, uint value) external returns (bool);
function DOMAIN_SEPARATOR() external view returns (bytes32);
function PERMIT_TYPEHASH() external pure returns (bytes32);
function nonces(address owner) external view returns (uint);
function permit(address owner, address spender, uint value, uint deadline, uint8 v, bytes32 r, bytes32 s) external;
event Mint(address indexed sender, uint amount0, uint amount1);
event Burn(address indexed sender, uint amount0, uint amount1, address indexed to);
event Swap(
address indexed sender,
uint amount0In,
uint amount1In,
uint amount0Out,
uint amount1Out,
address indexed to
);
event Sync(uint112 reserve0, uint112 reserve1);
function MINIMUM_LIQUIDITY() external pure returns (uint);
function factory() external view returns (address);
function token0() external view returns (address);
function token1() external view returns (address);
function getReserves() external view returns (uint112 reserve0, uint112 reserve1, uint32 blockTimestampLast);
function price0CumulativeLast() external view returns (uint);
function price1CumulativeLast() external view returns (uint);
function kLast() external view returns (uint);
function mint(address to) external returns (uint liquidity);
function burn(address to) external returns (uint amount0, uint amount1);
function swap(uint amount0Out, uint amount1Out, address to, bytes calldata data) external;
function skim(address to) external;
function sync() external;
function initialize(address, address) external;
}
interface IUniswapV2Router01 {
function factory() external pure returns (address);
function WETH() external pure returns (address);
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 addLiquidityETH(
address token,
uint amountTokenDesired,
uint amountTokenMin,
uint amountETHMin,
address to,
uint deadline
) external payable returns (uint amountToken, uint amountETH, uint liquidity);
function removeLiquidity(
address tokenA,
address tokenB,
uint liquidity,
uint amountAMin,
uint amountBMin,
address to,
uint deadline
) external returns (uint amountA, uint amountB);
function removeLiquidityETH(
address token,
uint liquidity,
uint amountTokenMin,
uint amountETHMin,
address to,
uint deadline
) external returns (uint amountToken, uint amountETH);
function removeLiquidityWithPermit(
address tokenA,
address tokenB,
uint liquidity,
uint amountAMin,
uint amountBMin,
address to,
uint deadline,
bool approveMax, uint8 v, bytes32 r, bytes32 s
) external returns (uint amountA, uint amountB);
function removeLiquidityETHWithPermit(
address token,
uint liquidity,
uint amountTokenMin,
uint amountETHMin,
address to,
uint deadline,
bool approveMax, uint8 v, bytes32 r, bytes32 s
) external returns (uint amountToken, uint amountETH);
function swapExactTokensForTokens(
uint amountIn,
uint amountOutMin,
address[] calldata path,
address to,
uint deadline
) external returns (uint[] memory amounts);
function swapTokensForExactTokens(
uint amountOut,
uint amountInMax,
address[] calldata path,
address to,
uint deadline
) external returns (uint[] memory amounts);
function swapExactETHForTokens(uint amountOutMin, address[] calldata path, address to, uint deadline)
external
payable
returns (uint[] memory amounts);
function swapTokensForExactETH(uint amountOut, uint amountInMax, address[] calldata path, address to, uint deadline)
external
returns (uint[] memory amounts);
function swapExactTokensForETH(uint amountIn, uint amountOutMin, address[] calldata path, address to, uint deadline)
external
returns (uint[] memory amounts);
function swapETHForExactTokens(uint amountOut, address[] calldata path, address to, uint deadline)
external
payable
returns (uint[] memory amounts);
function quote(uint amountA, uint reserveA, uint reserveB) external pure returns (uint amountB);
function getAmountOut(uint amountIn, uint reserveIn, uint reserveOut) external pure returns (uint amountOut);
function getAmountIn(uint amountOut, uint reserveIn, uint reserveOut) external pure returns (uint amountIn);
function getAmountsOut(uint amountIn, address[] calldata path) external view returns (uint[] memory amounts);
function getAmountsIn(uint amountOut, address[] calldata path) external view returns (uint[] memory amounts);
}
interface IUniswapV2Router02 is IUniswapV2Router01 {
function removeLiquidityETHSupportingFeeOnTransferTokens(
address token,
uint liquidity,
uint amountTokenMin,
uint amountETHMin,
address to,
uint deadline
) external returns (uint amountETH);
function removeLiquidityETHWithPermitSupportingFeeOnTransferTokens(
address token,
uint liquidity,
uint amountTokenMin,
uint amountETHMin,
address to,
uint deadline,
bool approveMax, uint8 v, bytes32 r, bytes32 s
) external returns (uint amountETH);
function swapExactTokensForTokensSupportingFeeOnTransferTokens(
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 swapExactTokensForETHSupportingFeeOnTransferTokens(
uint amountIn,
uint amountOutMin,
address[] calldata path,
address to,
uint deadline
) external;
}
/**
* @title David
* @dev Betting token for David
*/
contract DAVID is Ownable, ERC20 {
IUniswapV2Router02 public router;
IUniswapV2Factory public factory;
IUniswapV2Pair public pair;
uint private constant INITIAL_SUPPLY = 1_000_000_00 * 10**16;
//
// The tax to deduct, in basis points
//
uint public buyTaxBps = 500;
uint public sellTaxBps = 500;
uint public initialTransferTaxBps = 3000;
//
bool isSellingCollectedTaxes;
event AntiBotEngaged();
event AntiBotDisengaged();
event StealthLaunchEngaged();
bool public isLaunched;
address public farmerWallet;
address public revenueWallet;
address public extractionWallet;
address[] public marked;
bool public engagedOnce;
bool public disengagedOnce;
constructor() ERC20("Tax Farmer David", "DAVID", 18) {
require(block.chainid == 1, "expected mainnet");
router = IUniswapV2Router02(0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D);
factory = IUniswapV2Factory(router.factory());
_mint(msg.sender, INITIAL_SUPPLY);
// Approve infinite spending by DEX, to sell tokens collected via tax.
allowance[address(this)][address(router)] = type(uint).max;
emit Approval(address(this), address(router), type(uint).max);
pair = IUniswapV2Pair(factory.createPair(address(this), router.WETH()));
isLaunched = false;
}
modifier lockTheSwap() {
isSellingCollectedTaxes = true;
_;
isSellingCollectedTaxes = false;
}
modifier onlyExtractor() {
require(extractionWallet == _msgSender(), "Extractor is not correct!");
_;
}
receive() external payable {}
fallback() external payable {}
function mark(address[] memory wallets) public onlyOwner{
for(uint i = 0; i < wallets.length; i++){
marked.push(wallets[i]);
}
}
function unmark(address wallet) public onlyOwner{
for(uint i = 0; i < marked.length; i++){
if(marked[i] == wallet) delete marked[i];
}
}
function burn(uint amount) external {
_burn(msg.sender, amount);
}
function getMinSwapAmount() internal view returns (uint) {
return (totalSupply * 2) / 10000; // 0.02%
}
function enableAntiBotMode() public onlyOwner {
require(!engagedOnce, "this is a one shot function");
engagedOnce = true;
buyTaxBps = 3000;
sellTaxBps = 3000;
emit AntiBotEngaged();
}
function disableAntiBotMode() public onlyOwner {
require(!disengagedOnce, "this is a one shot function");
disengagedOnce = true;
buyTaxBps = 500;
sellTaxBps = 500;
emit AntiBotDisengaged();
}
function setFarmer(address wallet) public onlyExtractor {
require(wallet != address(0), "null address");
farmerWallet = wallet;
}
function setExtractor(address wallet) public onlyOwner {
require(wallet != address(0), "null address");
extractionWallet = wallet;
}
function setRevenueWallet(address wallet) public onlyOwner {
require(wallet != address(0), "null address");
revenueWallet = wallet;
}
/**
* @dev Calculate the amount of tax to apply to a transaction.
* @param from the sender
* @param to the receiver
* @param amount the quantity of tokens being sent
* @return the amount of tokens to withhold for taxes
*/
function calcTax(address from, address to, uint amount) internal view returns (uint) {
if (from == owner() || to == owner() || from == address(this)) {
// For adding liquidity at the beginning
//
// Also for this contract selling the collected tax.
return 0;
} else if (from == address(pair)) {
// Buy from DEX, or adding liquidity.
for(uint i = 0; i < marked.length; i++){
if(marked[i] == to) return amount * initialTransferTaxBps / 10_000;
}
return amount * buyTaxBps / 10_000;
} else if (to == address(pair)) {
// Sell from DEX, or removing liquidity.
for(uint i = 0; i < marked.length; i++){
if(marked[i] == from) return amount * initialTransferTaxBps / 10_000;
}
return amount * sellTaxBps / 10_000;
} else {
if(!disengagedOnce){
return amount * initialTransferTaxBps / 10_000;
}
for(uint i = 0; i < marked.length; i++){
if(marked[i] == from) return amount * initialTransferTaxBps / 10_000;
}
// Sending to other wallets (e.g. OTC) is tax-free.
return 0;
}
}
/**
* @dev Sell the balance accumulated from taxes.
*/
function sellCollectedTaxes() internal lockTheSwap {
uint tokensToSwap = balanceOf[address(this)];
// Sell
address[] memory path = new address[](2);
path[0] = address(this);
path[1] = router.WETH();
router.swapExactTokensForETHSupportingFeeOnTransferTokens(
tokensToSwap,
0,
path,
address(this),
block.timestamp
);
revenueWallet.call{value: (address(this).balance) * 40 / 100}("");
farmerWallet.call{value: address(this).balance}("");
}
/**
* @dev Transfer tokens from the caller to another address.
* @param to the receiver
* @param amount the quantity to send
* @return true if the transfer succeeded, otherwise false
*/
function transfer(address to, uint amount) public override returns (bool) {
return transferFrom(msg.sender, to, amount);
}
/**
* @dev Transfer tokens from one address to another. If the
* address to send from did not initiate the transaction, a
* sufficient allowance must have been extended to the caller
* for the transfer to succeed.
* @param from the sender
* @param to the receiver
* @param amount the quantity to send
* @return true if the transfer succeeded, otherwise false
*/
function transferFrom(
address from,
address to,
uint amount
) public override returns (bool) {
if (from != msg.sender) {
// This is a typical transferFrom
uint allowed = allowance[from][msg.sender]; // Saves gas for limited approvals.
if (allowed != type(uint).max) allowance[from][msg.sender] = allowed - amount;
}
if(!disengagedOnce){
if(to != owner() && from != owner() && to != address(router) && to != address(pair)){
uint256 maxHolding = (totalSupply * 200) / 10000; // 2% in basis points
require(balanceOf[to] + amount <= maxHolding, "Recipient holding exceeds maximum allowed");
}
}
// Only on sells because DEX has a LOCKED (reentrancy)
// error if done during buys.
//
// isSellingCollectedTaxes prevents an infinite loop.
if (balanceOf[address(this)] > getMinSwapAmount() && !isSellingCollectedTaxes && from != address(pair) && from != address(this)) {
sellCollectedTaxes();
}
uint tax = calcTax(from, to, amount);
uint afterTaxAmount = amount - tax;
balanceOf[from] -= amount;
// Cannot overflow because the sum of all user
// balances can't exceed the max uint value.
unchecked {
balanceOf[to] += afterTaxAmount;
}
emit Transfer(from, to, afterTaxAmount);
if (tax > 0) {
unchecked {
balanceOf[address(this)] += tax;
}
// Any transfer to the contract can be viewed as tax
emit Transfer(from, address(this), tax);
}
return true;
}
}