Blockchain Explorer Development Tutorials, Guides & Insights
Unlock 2+ expert-curated blockchain explorer tutorials, real-world code snippets, and modern dev strategies. From fundamentals to advanced topics, boost your blockchain explorer skills on DeveloperBreeze.
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How to Query ERC-20 Token Balances and Transactions Using Ethers.js and Etherscan API
In this tutorial, you will learn how to use Ethers.js and the Etherscan API to query ERC-20 token balances and view token transaction history for a specific Ethereum address. ERC-20 tokens are a standard for fungible tokens on the Ethereum blockchain, and querying their balances and transactions is essential for building decentralized applications (dApps) like wallets, token explorers, and DeFi platforms.
By the end of this tutorial, you will be able to:
Etherscan vs Infura: Choosing the Right API for Your Blockchain Application
- Use Etherscan if:
- You only need to read blockchain data.
- You want to build tools for analytics or explorers.
- You don’t need to send transactions or interact directly with smart contracts.
- Use Infura if:
- You need to interact with the Ethereum blockchain in real-time.
- You’re building dApps, wallets, or tools that require transactions.
- You need to write data to the blockchain, such as sending Ether or deploying contracts.
In some cases, you might want to use both Etherscan and Infura. For example, you might use Etherscan to query transaction histories or token transfers, and Infura to send transactions or deploy contracts.