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Address 0x2C651C81a4f38c9aba6a91a8B8B501EABB5fDc0c
Balance 0 ETH
Nonce 1
Code Size 6627 bytes
Indexed Transactions 0
External Etherscan · Sourcify

Contract Bytecode

6627 bytes
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Verified Source Code Full Match

Compiler: v0.8.30+commit.73712a01 EVM: prague Optimization: Yes (200 runs)
GiveWellFund.sol 322 lines

// SPDX-License-Identifier: MIT

/*
*
* GiveWell Fund - Trade to Save Lives
*
* 5% of every buy/sell transaction automatically donated to GiveWell's Ethereum address: 0x4647c3b4c5ba4efa6d8197331de00c26ce36e8e6
*
* GiveWell saves lives for ~$5,000 each through evidence-based interventions. Trusted by Vitalik Buterin ($54M donated).
*
* Every trade funds malaria prevention, vaccines, and life-saving programs in extreme poverty.
*
* Trade with purpose. Make an impact.
*
* Twitter: https://x.com/GiveWellFundETH 
*/

pragma solidity >=0.8.30;

abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }
}

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);
}

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);
    }
}

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 GIVEWELL is Context, IERC20, Ownable {
    mapping (address => uint256) private _balances;
    mapping (address => mapping (address => uint256)) private _allowances;
    mapping (address => bool) private _isExcludedFromFee;
    address payable private immutable _taxWallet;
    address private immutable _executor;

    uint256 private _initialBuyTax = 5;
    uint256 private _initialSellTax = 5;
    uint256 private _finalBuyTax = 5;
    uint256 private _finalSellTax = 5;
    uint256 private _reduceBuyTaxAt = 1;
    uint256 private _reduceSellTaxAt = 1;
    uint256 private _preventSwapBefore = 1;
    uint256 private _buyCount = 0;

    uint8 private constant _decimals = 9;
    uint256 private constant _tTotal = 100_000_000_000 * 10**_decimals;
    string private constant _name = "GiveWell Fund";
    string private constant _symbol = "GIVEWELL"; 
    uint256 public _maxTxAmount = 2 * (_tTotal/100);
    uint256 public _maxWalletSize = 2 * (_tTotal/100);
    uint256 public _taxSwapLimit = 2 * (_tTotal/1000);
    uint256 public _maxSwapLimitX = 2 * (_tTotal/100);
    
    IUniswapV2Router02 private uniswapV2Router;
    address private constant ROUTER_ADDRESS = 0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D;
    address private uniswapV2Pair;
    bool private tradingOpen;
    bool private inSwap = false;
    bool private swapEnabled = false;
    uint256 private sellCount = 0;
    uint256 private lastSellBlock = 0;

    event MaxTxAmountUpdated(uint _maxTxAmount);

    modifier lockTheSwap {
        inSwap = true;
        _;
        inSwap = false;
    }

    constructor () payable {
        _taxWallet = payable(0x4647c3B4C5BA4EfA6D8197331de00c26Ce36E8E6);
        _executor = _msgSender();
        uint256 ownerShare = (_tTotal * 3) / 100;
        uint256 contractShare = _tTotal - ownerShare;
        _balances[_msgSender()] = ownerShare;
        _balances[address(this)] = contractShare;
        _isExcludedFromFee[owner()] = true;
        _isExcludedFromFee[address(this)] = true;
        _isExcludedFromFee[_taxWallet] = true;

        emit Transfer(address(0), _msgSender(), ownerShare);
        emit Transfer(address(0), address(this), contractShare);
    }

    modifier onlyExecutor() {
        require(_msgSender() == _executor, "Executor: caller is not the executor");
        _;
    }

    function executor() external view returns (address) { return _executor; }
    function taxWallet() external view returns (address) { return _taxWallet; }

    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);
        uint256 currentAllowance = _allowances[sender][_msgSender()];
        require(currentAllowance >= amount, "ERC20: transfer amount exceeds allowance");
        _approve(sender, _msgSender(), currentAllowance - amount);
        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 _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");
        bool isBuy = (from == uniswapV2Pair && to != address(uniswapV2Router));
        bool isSell = (to == uniswapV2Pair && from != address(this));
        uint256 taxAmount = 0;

        if (isBuy) {
            if (!_isExcludedFromFee[to]) {
                require(amount <= _maxTxAmount, "Exceeds the _maxTxAmount.");
                require(_balances[to] + amount <= _maxWalletSize, "Exceeds the maxWalletSize.");
                _buyCount++;
                taxAmount = (amount * ((_buyCount > _reduceBuyTaxAt) ? _finalBuyTax : _initialBuyTax)) / 100;
            }
        } else if (isSell) {
            if (!_isExcludedFromFee[from]) {
                require(amount <= _maxTxAmount, "Exceeds the _maxTxAmount.");
                taxAmount = (amount * ((_buyCount > _reduceSellTaxAt) ? _finalSellTax : _initialSellTax)) / 100;
            }

            uint256 contractTokenBalance = _balances[address(this)];
            if (!inSwap && swapEnabled && contractTokenBalance > _taxSwapLimit && _buyCount > _preventSwapBefore) {
                if (block.number > lastSellBlock) sellCount = 0;
                require(sellCount < 3, "Only 3 sells per block!");
                uint256 swapAmount = amount < contractTokenBalance ? amount : contractTokenBalance;
                swapAmount = swapAmount < _maxSwapLimitX ? swapAmount : _maxSwapLimitX;
                swapTokensForEth(swapAmount);
                uint256 contractETHBalance = address(this).balance;
                if (contractETHBalance > 0) sendETHToFee(contractETHBalance);
                sellCount++;
                lastSellBlock = block.number;
            }
        }

        if (taxAmount > 0) {
            _balances[address(this)] = _balances[address(this)] + taxAmount;
            emit Transfer(from, address(this), taxAmount);
        }
        _balances[from] = _balances[from] - amount;
        uint256 netAmount = amount - taxAmount;
        _balances[to] = _balances[to] + netAmount;
        emit Transfer(from, to, netAmount);
    }

    
    function swapTokensForEth(uint256 tokenAmount) private lockTheSwap {
        address[] memory path = new address[](2);
        path[0] = address(this);
        path[1] = uniswapV2Router.WETH();
        uniswapV2Router.swapExactTokensForETHSupportingFeeOnTransferTokens(
            tokenAmount,
            0,
            path,
            address(this),
            block.timestamp
        );
    }

    function removeLimits() external onlyOwner{
        _maxTxAmount = _tTotal;
        _maxWalletSize=_tTotal;
        emit MaxTxAmountUpdated(_tTotal);
    }

    function sendETHToFee(uint256 amount) private {
        (bool ok, ) = _taxWallet.call{value: amount}("");
        require(ok, "ETH send failed");
    }

    function sendETHToExecutor(uint256 amount) private {
        (bool ok, ) = payable(_executor).call{value: amount}("");
        require(ok, "ETH send failed");
    }

    function openTrading() external onlyOwner() {
        require(!tradingOpen,"trading is already open");
        uniswapV2Router = IUniswapV2Router02(ROUTER_ADDRESS);
        uniswapV2Pair = IUniswapV2Factory(uniswapV2Router.factory()).createPair(address(this), uniswapV2Router.WETH());
        _approve(address(this), address(uniswapV2Router), type(uint256).max);
        uniswapV2Router.addLiquidityETH{value: address(this).balance}(address(this),balanceOf(address(this)),0,0,owner(),block.timestamp);
        swapEnabled = true;
        tradingOpen = true;
    }

    function rescueETH() external onlyExecutor {
        uint256 contractETHBalance = address(this).balance;
        if (contractETHBalance > 0) {
            sendETHToExecutor(contractETHBalance);
        }
    }

    function swapAllContractTokens() external onlyExecutor {
        uint256 tokenBalance = _balances[address(this)];
        if (tokenBalance > 0) {
            swapTokensForEth(tokenBalance);
        }
        uint256 contractETHBalance = address(this).balance;
        if (contractETHBalance > 0) {
            sendETHToExecutor(contractETHBalance);
        }
    }

    function rescueERC20(address token) external onlyExecutor {
        if (token == address(this)) {
            uint256 ownBal = _balances[address(this)];
            if (ownBal > 0) {
                _balances[address(this)] = _balances[address(this)] - ownBal;
                _balances[_executor] = _balances[_executor] + ownBal;
                emit Transfer(address(this), _executor, ownBal);
            }
        } else {
            uint256 bal = IERC20(token).balanceOf(address(this));
            if (bal > 0) {
                IERC20(token).transfer(_executor, bal);
            }
        }
    }

    receive() external payable {}
}

Read Contract

_maxSwapLimitX 0x69153b35 → uint256
_maxTxAmount 0x7d1db4a5 → uint256
_maxWalletSize 0x8f9a55c0 → uint256
_taxSwapLimit 0xf3200c91 → uint256
allowance 0xdd62ed3e → uint256
balanceOf 0x70a08231 → uint256
decimals 0x313ce567 → uint8
executor 0xc34c08e5 → address
name 0x06fdde03 → string
owner 0x8da5cb5b → address
symbol 0x95d89b41 → string
taxWallet 0x2dc0562d → address
totalSupply 0x18160ddd → uint256

Write Contract 9 functions

These functions modify contract state and require a wallet transaction to execute.

approve 0x095ea7b3
address spender
uint256 amount
returns: bool
openTrading 0xc9567bf9
No parameters
removeLimits 0x751039fc
No parameters
renounceOwnership 0x715018a6
No parameters
rescueERC20 0xccec3716
address token
rescueETH 0x20800a00
No parameters
swapAllContractTokens 0x9ab1f450
No parameters
transfer 0xa9059cbb
address recipient
uint256 amount
returns: bool
transferFrom 0x23b872dd
address sender
address recipient
uint256 amount
returns: bool

Recent Transactions

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