Etherscan API V2

Overview

Query blockchain balances using Etherscan's unified API V2. This skill covers:

• Native ETH balance queries
• ERC-20 token balance queries
• Multi-chain support via the chainid parameter

Scope: This skill focuses on balance queries for free-tier accounts. For other Etherscan API features, consult the fallback documentation.

Prerequisites

API Key Validation

Before making any API call, verify the ETHERSCAN_API_KEY environment variable is set: