Ethers.Js Development Tutorials, Guides & Insights

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Now let’s query the ERC-20 token transfer history for a specific wallet address using the Etherscan API.

const axios = require('axios');

// Replace with your Etherscan API key
const apiKey = 'YOUR_ETHERSCAN_API_KEY';

// Replace with the wallet address you want to query
const address = '0xYourEthereumAddress';

// Replace with the ERC-20 token contract address
const contractAddress = '0xTokenContractAddress';

// Etherscan API URL to fetch ERC-20 token transactions
const url = `https://api.etherscan.io/api?module=account&action=tokentx&contractaddress=${contractAddress}&address=${address}&startblock=0&endblock=99999999&sort=asc&apikey=${apiKey}`;

async function getTokenTransactions() {
    try {
        // Make the API request to Etherscan
        const response = await axios.get(url);
        const transactions = response.data.result;

        // Log the token transactions
        transactions.forEach(tx => {
            console.log(`
                From: ${tx.from}
                To: ${tx.to}
                Value: ${ethers.utils.formatUnits(tx.value, 18)} Tokens
                Transaction Hash: ${tx.hash}
            `);
        });
    } catch (error) {
        console.error('Error fetching token transactions:', error);
    }
}

// Call the function to get the token transactions
getTokenTransactions();

• Contract Address: Replace '0xTokenContractAddress' with the ERC-20 token contract’s address (for example, USDT, DAI, etc.).
• Wallet Address: Replace '0xYourWalletAddress' with the wallet address whose balance you want to query.
• ABI (Application Binary Interface): The ABI specifies the functions and data structures used in the smart contract. In this case, we’re using a simple balanceOf function to query the balance.

node contractInteraction.js

If everything is set up correctly, the script will output the wallet’s Ethereum balance in Ether:

Wallet Address: 0xYourEthereumAddress
Wallet Balance: 2.345 ETH

• Website: Web3.js

• Description: A lightweight and fully featured library for interacting with the Ethereum blockchain.
• Use Cases:
• Interact with smart contracts and wallets.
• Create and manage Ethereum addresses.
• Sign transactions and data.
• Query the Ethereum blockchain and perform low-level operations.
• Key Features:
• Modular design with a smaller bundle size compared to Web3.js.
• Built-in support for ENS (Ethereum Name Service).
• Simplified API for common Ethereum tasks.
• Installation: