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 on every plan; full holdings on PRO)
• Transaction history queries (normal, internal, ERC-20/ERC-721/ERC-1155 transfers)
• First-funding lookup for an address (PRO fundedby with a 2-call free-tier fallback)
• Multi-chain support via the chainid parameter
• Auto-detection of Free vs Lite vs PRO so paid-only chains and PRO-only endpoints are used when available

Scope: Read-only account queries. For other Etherscan API features, consult the fallback documentation.

Prerequisites

API Key Validation