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Outline

•  contract DailyCheckin *
•    - function checkIn()
•    - function withdraw()
•    - function getBalance()

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/**
 *Submitted for verification at basescan.org on 2025-04-21
*/

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

contract DailyCheckin {
    address public owner;
    uint256 public constant CHECKIN_FEE = 0.000019 ether; // 
    mapping(address => uint256) public lastCheckin; // 
    uint256 public totalCheckins; // 

    event Checkin(address indexed user, uint256 timestamp, uint256 amount);

    constructor() {
        owner = msg.sender;
    }

    // 
    function checkIn() external payable {
        require(msg.value == CHECKIN_FEE, "Must send exactly 0.0000055 ETH");
        
        // 
        uint256 lastCheckinTime = lastCheckin[msg.sender];
        if (lastCheckinTime > 0) {
            uint256 currentDay = block.timestamp / 1 days;
            uint256 lastCheckinDay = lastCheckinTime / 1 days;
            require(currentDay > lastCheckinDay, "Can only check-in once per day");
        }

        // 
        lastCheckin[msg.sender] = block.timestamp;
        totalCheckins++;

        // Emit event
        emit Checkin(msg.sender, block.timestamp, msg.value);
    }

    // 
    function withdraw() external {
        require(msg.sender == owner, "Only owner can withdraw");
        payable(owner).transfer(address(this).balance);
    }

    // 
    function getBalance() external view returns (uint256) {
        return address(this).balance;
    }
}

• No Contract Security Audit Submitted- Submit Audit Here

[{"inputs":[],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"user","type":"address"},{"indexed":false,"internalType":"uint256","name":"timestamp","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"}],"name":"Checkin","type":"event"},{"inputs":[],"name":"CHECKIN_FEE","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"checkIn","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[],"name":"getBalance","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"lastCheckin","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"totalCheckins","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"withdraw","outputs":[],"stateMutability":"nonpayable","type":"function"}]

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