eth_trx_gist.js

// Import the ethers library
const ethers = require('ethers');

// Connect to the Ethereum mainnet
let provider = new ethers.providers.JsonRpcProvider('https://mainnet.infura.io/v3/INFURA_PROJECT_ID');

// Define the addresses to look up
let addresses = [
    '0x57f1887a8BF19b14fC0dF6Fd9B2acc9Af147eA85',
    '0xf4bfaf916a68b0fC859D63a319034C0f72A88a5C',
    '0x3b138FC7eC06B2A44565994CfDe5134A75915995'
];

addresses.forEach((address) => {
    // Fetch the balance of the address
    provider.getBalance(address).then((balance) => {
        let etherString = ethers.utils.formatEther(balance);
        console.log('Balance of', address, ':', etherString);
    });

    // Fetch the transaction count of the address
    provider.getTransactionCount(address).then((txCount) => {
        console.log('Transaction Count of', address, ':', txCount);
    });

    // Determine if the address is a contract
    provider.getCode(address).then((code) => {
        if(code === '0x') {
            console.log(address, 'is an Externally Owned Account (EOA)');
        } else {
            console.log(address, 'is a Contract Account');
        }
    });
});