# ETH Faucet Contract

**Published by:** [Moei](https://paragraph.com/@0xmoei-2/)
**Published on:** 2023-04-14
**URL:** https://paragraph.com/@0xmoei-2/eth-faucet-contract

## Content

// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; contract FaucetBy0xMoei { address payable public admin; uint256 public maxWithdrawalPerDay = 0.3 ether; uint256 public withdrawalFee = 0.001 ether; uint256 public lastWithdrawalBlock; mapping(address => uint256) public lastWithdrawalTimestamps; mapping(address => bool) public whitelist; event Withdrawal(address indexed user, uint256 amount, uint256 timestamp); event Deposit(address indexed user, uint256 amount, uint256 timestamp); event MaxWithdrawalPerDayChanged(uint256 newMaxWithdrawalPerDay, uint256 timestamp); event WithdrawalFeeChanged(uint256 newWithdrawalFee, uint256 timestamp); event WhitelistAdded(address indexed user, uint256 timestamp); event WhitelistRemoved(address indexed user, uint256 timestamp); constructor() { admin = payable(msg.sender); lastWithdrawalBlock = block.number; } modifier onlyAdmin() { require(msg.sender == admin, "Only admin can perform this action"); _; } function withdraw() external { require(lastWithdrawalTimestamps[msg.sender] + 1 days <= block.timestamp, "You can only withdraw once per day"); require(address(this).balance >= maxWithdrawalPerDay, "Insufficient balance"); require(block.number > lastWithdrawalBlock, "Can only withdraw once per block"); require(msg.sender != admin, "Admin cannot withdraw"); require(!whitelist[msg.sender], "Address is whitelisted for higher withdrawal limit"); lastWithdrawalTimestamps[msg.sender] = block.timestamp; lastWithdrawalBlock = block.number; uint256 withdrawalAmount = maxWithdrawalPerDay - withdrawalFee; payable(msg.sender).transfer(withdrawalAmount); payable(admin).transfer(withdrawalFee); emit Withdrawal(msg.sender, withdrawalAmount, block.timestamp); } function setMaxWithdrawalPerDay(uint256 newMaxWithdrawalPerDay) external onlyAdmin { require(newMaxWithdrawalPerDay > 0, "Max withdrawal per day must be greater than zero"); maxWithdrawalPerDay = newMaxWithdrawalPerDay; emit MaxWithdrawalPerDayChanged(newMaxWithdrawalPerDay, block.timestamp); } function setWithdrawalFee(uint256 newWithdrawalFee) external onlyAdmin { withdrawalFee = newWithdrawalFee; emit WithdrawalFeeChanged(newWithdrawalFee, block.timestamp); } function addToWhitelist(address user) external onlyAdmin { whitelist[user] = true; emit WhitelistAdded(user, block.timestamp); } function removeFromWhitelist(address user) external onlyAdmin { whitelist[user] = false; emit WhitelistRemoved(user, block.timestamp); } function withdrawBalance() external onlyAdmin { admin.transfer(address(this).balance); } receive() external payable { emit Deposit(msg.sender, msg.value, block.timestamp); } function deposit() external payable { emit Deposit(msg.sender, msg.value, block.timestamp); } }

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