Token Transfers Development Tutorials, Guides & Insights

const ethers = require('ethers');

// Replace with your Infura or other Ethereum node provider URL
const provider = new ethers.JsonRpcProvider('https://mainnet.infura.io/v3/YOUR_INFURA_PROJECT_ID');

// Replace with the ERC-20 token contract address (e.g., USDT, DAI)
const contractAddress = '0xTokenContractAddress';

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

// ERC-20 token ABI (just the balanceOf function)
const abi = [
    'function balanceOf(address owner) view returns (uint256)'
];

// Create a contract instance
const contract = new ethers.Contract(contractAddress, abi, provider);

async function getTokenBalance() {
    try {
        // Query the balance
        const balance = await contract.balanceOf(walletAddress);

        // Convert balance to a human-readable format (tokens usually have 18 decimals)
        const formattedBalance = ethers.utils.formatUnits(balance, 18);

        console.log(`Token Balance: ${formattedBalance}`);
    } catch (error) {
        console.error('Error fetching token balance:', error);
    }
}

// Call the function to get the token balance
getTokenBalance();

• Contract Address: Replace '0xTokenContractAddress' with the address of the ERC-20 token (e.g., USDT, DAI, or any other ERC-20 token).
• Wallet Address: Replace '0xYourEthereumAddress' with the wallet address whose token balance you want to query.
• ABI: We are using a minimal ABI with just the balanceOf function, which is all that’s required to query the token balance.

Once you have written the script, run it from your terminal:

node etherscanBalance.js

Introduction

In this tutorial, we'll learn how to track a specific Solana address for new trades and notify via console.log with the transaction details, including the amount bought or sold. We will use the Solana Web3.js library to connect to the Solana blockchain, listen for new transactions, and fetch their details.