subscribe.js

// Import
const Web3 = require("web3");

// Constants
const USDC_mainnet = "0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48";
const Provider_URL = "wss://eth-mainnet.alchemyapi.io/v2/";

async function eventSubscribe() {
    const web3 = new Web3(Provider_URL);
    
    var subscription = web3.eth.subscribe(
        "logs", {
            address: USDC_mainnet,
            topic: [web3.utils.keccak256("Transfer(address,address,uint256)")]
        }, (error, result) => {
            if(error)
                console.error(error);
            else
                console.log(result);
        }
    ).on(
        "connected", (subscriptionId) => {
            console.log("Subscription ID:", subscriptionId);
        }
    ).on(
        "data", (log) => {
            console.log("----------------------------------------");
            console.log(log);
        }
    );
    
    // subscription.unsubscribe(
    //     (error, success) => {
    //         if(success)
    //             console.log("Un-subscription status:", success);
    //     }
    // );
}

// Main function
async function main() {
    await eventSubscribe();
}

main()
    .then(() => {
        //process.exit(EXIT_SUCCESS); // DO NOT LEAVE THIS LINE UN-COMMENTED
    })
    .catch((error) => {
        console.error(error);
        process.exit(1);
    });