faucet.sol

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import "https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/token/ERC20/IERC20.sol";

contract Faucet {
    address public owner;
    // USDC token contract interface
    IERC20 public usdc;
    // USDT token contract interface
    IERC20 public usdt;
    // timestamp of last token send
    uint256 public lastSend;
    // mapping of users and last drip time
    mapping(address => uint256) public lastDrip;

    // constructor sets token contract addresses and lastSend to current time
    constructor(address _usdcAddress, address _usdtAddress) {
        owner = msg.sender;
        usdc = IERC20(_usdcAddress);
        usdt = IERC20(_usdtAddress);
        lastSend = block.timestamp;
    }

    // send tokens to user if 24 hours have elapsed since last drip
    function drip() public {
        require(block.timestamp >= lastDrip[msg.sender] + 1 days, "24 hours have not elapsed since last drip");
        require(usdc.balanceOf(address(this)) >= 25e6, "USDC balance insufficient");
        require(usdt.balanceOf(address(this)) >= 25e18, "USDT balance insufficient");
        require(usdc.transfer(msg.sender, 25e6), "USDC transfer failed");
        require(usdt.transfer(msg.sender, 25e18), "USDT transfer failed");
        lastDrip[msg.sender] = block.timestamp;
    }

    // allow users to deposit USDC tokens
    function depositUSDC(uint256 amount) public {
        require(usdc.transferFrom(msg.sender, address(this), amount), "USDC transfer failed");
    }

    // allow users to deposit USDT tokens
    function depositUSDT(uint256 amount) public {
        require(usdt.transferFrom(msg.sender, address(this), amount), "USDT transfer failed");
    }

    // allow owner to withdraw all tokens from the contract
    function withdrawAll() public {
        require(msg.sender == owner, "Only the owner can withdraw tokens");
        uint256 usdcBalance = usdc.balanceOf(address(this));
        uint256 usdtBalance = usdt.balanceOf(address(this));
        usdc.transfer(msg.sender, usdcBalance);
        usdt.transfer(msg.sender, usdtBalance);
    }

    // get the balance of both USDC and USDT tokens
    function getBalance() public view returns (uint256 usdcBalance, uint256 usdtBalance) {
        return (usdc.balanceOf(address(this)), usdt.balanceOf(address(this)));
    }
}