Contract Source Code (Solidity)

IDE

• Blockscan IDE
• 🤖 Code ReaderBeta

Outline

•  contract OnChainGM *
•    - function onChainGM()
•    - function timeUntilNextGM(address user ...

More Options

• Similar
• Submit Audit
• Compare

/**
 *Submitted for verification at berascan.com on 2025-02-28
*/

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.28;

contract OnChainGM {
    // Immutable variables don't use storage slots
    address public immutable feeRecipient;
    uint256 public immutable GM_FEE;
    uint256 public constant TIME_LIMIT = 24 hours;
    
    // Mapping to store last GM timestamp for each user
    mapping(address => uint256) public lastGMTimestamp;
    
    // Event for tracking GMs
    event OnChainGMEvent(address indexed sender);
    
    constructor() {
        feeRecipient = 0x7500A83DF2aF99B2755c47B6B321a8217d876a85;
        GM_FEE = 0.015 ether;
    }
    
    // Gas optimized GM function with timestamp check
    function onChainGM() external payable {
        if (msg.value != GM_FEE) {
            revert("Incorrect ETH fee");
        }
        
        // Check if 24 hours have passed since last GM
        if (!(block.timestamp >= lastGMTimestamp[msg.sender] + TIME_LIMIT || lastGMTimestamp[msg.sender] == 0)) {
            revert("Wait 24 hours");
        }
        
        // Update last GM timestamp
        lastGMTimestamp[msg.sender] = block.timestamp;
        
        // Transfer fee after all checks
        (bool success,) = feeRecipient.call{value: msg.value}("");
        if (!success) {
            revert("Fee transfer failed");
        }
        
        emit OnChainGMEvent(msg.sender);
    }
    
    // View function to check remaining time
    function timeUntilNextGM(address user) external view returns (uint256) {
        if (lastGMTimestamp[user] == 0) return 0;
        
        uint256 timePassed = block.timestamp - lastGMTimestamp[user];
        if (timePassed >= TIME_LIMIT) return 0;
        
        return TIME_LIMIT - timePassed;
    }
}

• No Contract Security Audit Submitted- Submit Audit Here

[{"inputs":[],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"sender","type":"address"}],"name":"OnChainGMEvent","type":"event"},{"inputs":[],"name":"GM_FEE","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"TIME_LIMIT","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"feeRecipient","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"lastGMTimestamp","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"onChainGM","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"address","name":"user","type":"address"}],"name":"timeUntilNextGM","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"}]

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

61:1706:0:-:0;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;139:37;;;;;;;;;;;;;;;;;;190:42:1;178:55;;;160:74;;148:2;133:18;139:37:0;;;;;;;;675:720;;;:::i;:::-;;221:45;;;;;;;;;;;;258:8;221:45;;;;;391:25:1;;;379:2;364:18;221:45:0;245:177:1;1453:311:0;;;;;;;;;;-1:-1:-1;1453:311:0;;;;;:::i;:::-;;:::i;336:50::-;;;;;;;;;;-1:-1:-1;336:50:0;;;;;:::i;:::-;;;;;;;;;;;;;;;183:31;;;;;;;;;;;;;;;675:720;741:6;728:9;:19;724:79;;764:27;;;;;943:2:1;764:27:0;;;925:21:1;982:2;962:18;;;955:30;1021:19;1001:18;;;994:47;1058:18;;764:27:0;;;;;;;;724:79;920:10;904:15;:27;;;;;;;;;;;:40;;258:8;;904:40;:::i;:::-;885:15;:59;;:95;;;-1:-1:-1;964:10:0;948:15;:27;;;;;;;;;;;:32;885:95;879:154;;998:23;;;;;1608:2:1;998:23:0;;;1590:21:1;1647:2;1627:18;;;1620:30;1686:15;1666:18;;;1659:43;1719:18;;998:23:0;1406:337:1;879:154:0;1106:10;1090:15;:27;;;;;;;;;;;1120:15;1090:45;;1216:39;1090:27;1216:12;:17;;1241:9;;1090:15;1216:39;1090:15;1216:39;1241:9;1216:17;:39;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;1198:57;;;1271:7;1266:70;;1295:29;;;;;2160:2:1;1295:29:0;;;2142:21:1;2199:2;2179:18;;;2172:30;2238:21;2218:18;;;2211:49;2277:18;;1295:29:0;1958:343:1;1266:70:0;1361:26;;1376:10;;1361:26;;;;;713:682;675:720::o;1453:311::-;1539:21;;;1515:7;1539:21;;;;;;;;;;;:26;;1535:40;;-1:-1:-1;1574:1:0;;1453:311;-1:-1:-1;1453:311:0:o;1535:40::-;1635:21;;;1596:18;1635:21;;;;;;;;;;;1617:39;;:15;:39;:::i;:::-;1596:60;;258:8;1671:10;:24;1667:38;;-1:-1:-1;1704:1:0;;1453:311;-1:-1:-1;;1453:311:0:o;1667:38::-;1733:23;1746:10;258:8;1733:23;:::i;:::-;1726:30;1453:311;-1:-1:-1;;;1453:311:0:o;427:309:1:-;486:6;539:2;527:9;518:7;514:23;510:32;507:52;;;555:1;552;545:12;507:52;594:9;581:23;644:42;637:5;633:54;626:5;623:65;613:93;;702:1;699;692:12;1087:184;1139:77;1136:1;1129:88;1236:4;1233:1;1226:15;1260:4;1257:1;1250:15;1276:125;1341:9;;;1362:10;;;1359:36;;;1375:18;;:::i;:::-;1276:125;;;;:::o;2306:128::-;2373:9;;;2394:11;;;2391:37;;;2408:18;;:::i

ipfs://138ff79b315f8be1b31cadac1ff08ce3a82a8c6ea0b17f3295d2d1efbc56aa91