Etherscan API V2

Overview

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

• Native ETH balance queries
• ERC-20 token balance queries (single contract; full holdings require PRO plan)
• Transaction history queries (normal, internal, ERC-20/ERC-721/ERC-1155 transfers)
• Multi-chain support via the chainid parameter

Scope: This skill focuses on read-only account 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: