Blockscout

Provides a multichain REST API (and Etherscan-compatible JSON-RPC endpoints) for accessing explorer-indexed blockchain data such as addresses, transactions, blocks, tokens, NFTs, and contracts across supported EVM networks.

The Blockscout API uses api key authentication; has freemium pricing; offers a free tier (Free plan with credits that reset daily (paid plans reset monthly)); rate limits: Per-second request limit varies by plan, reported via x-ratelimit-limit/remaining/reset response headers. Verified 2026-07-08 with per-field source links.