OnChainGM is a smart contract that enables users to send a "GM" (Good Morning) transaction once every 24 hours on-chain. Each GM transaction requires a small ETH fee and is recorded on the blockchain. The project supports a referral-based reward system and tracks user activity on multiple networks.

OnChainGM is a minimalist Ethereum smart contract that lets users send an on-chain “GM” (Good Morning) message once per day, optionally rewarding the person who referred them.

• ✅ Daily GM — only once per day per address
• 💸 Optional referral reward (10% of the fee)
• 📦 Emits events for every GM and failed referral
• 🔐 Fully on-chain and permissionless

• Name: OnChainGM
• Language: Solidity ^0.8.0
• License: MIT
• Fee: 0.000029 ETH (29,000 Gwei)

• Fee Recipient: 0x7500A83DF2aF99B2755c47B6B321a8217d876a85

Send your daily GM and optionally specify a referrer.

• Requires exactly 0.000029 ETH as msg.value
• Emits OnChainGMEvent(sender, referrer)
• If referrer is non-zero and transfer succeeds → sends 10% of fee
• If transfer fails → logs ReferralFailed

Returns how many seconds remain until the specified user can GM again.

event OnChainGMEvent(address indexed sender, address indexed referrer);
event ReferralFailed(address indexed referrer, uint256 amount);

1. User sends exactly 0.000029 ETH by calling onChainGM(referrer)
2. Contract checks if msg.sender has already GMed today (based on UTC)
3. If not:
   • Attempts to send 10% of fee to referrer
   • Sends remaining ETH to feeRecipient
   • Emits OnChainGMEvent
4. If referral payment fails, logs ReferralFailed but does not revert

onChainGM("0xYourReferrersAddress")

🔔 Be sure to send exactly 0.000029 ETH as value.

The contract can be deployed to any EVM-compatible chain.
There is no owner, no upgradeability, and no admin — it's fully immutable.

MIT License — feel free to build on it, fork it, or integrate it into your dApp.

This contract is deployed and verified on Optimism:

👉 View on Blockscout

- Network: **Optimism**
- Address: `0x98F935ed6BD5b749AdeA581B50aF2ff0C1F89dEC`
- Verified Source Code: ✅

You can interact with it directly via Blockscout, Etherscan-compatible tools, or use it in your own dApps.