Deploy ICM Demo Contracts

Now that TeleporterMessenger, TeleporterRegistry, and a relayer are set up, let's test that everything works by deploying simple demo contracts.

What the Demo Contracts Do

The ICM demo consists of a sender and receiver pair:

• Sender contract: Encodes a string message and calls sendCrossChainMessage on TeleporterMessenger
• Receiver contract: Implements ITeleporterReceiver, decodes the incoming message, and stores it

Here's a simplified view of the receiver's implementation:

contract ICMDemoReceiver is ITeleporterReceiver {
    string public lastMessage;

    function receiveTeleporterMessage(
        bytes32 originChainID,
        address originSenderAddress,
        bytes calldata message
    ) external {
        // Only TeleporterMessenger can call this
        lastMessage = abi.decode(message, (string));
    }
}

This is the same ITeleporterReceiver pattern we covered in the ICM Protocol section — the demo contracts are just a minimal working example.

Pre-deployed on C-Chain

Fuji C-Chain already has a pre-deployed ICM demo contract at 0x05c474824e7d2cc67cf22b456f7cf60c0e3a1289. You only need to deploy the demo contract on your L1.

Deploy on Your L1

Use the tool below to deploy the ICM demo contract on your L1: