Bitquery vs Blockscout

Bitquery serves onchain data across 40+ blockchains through a single GraphQL schema, covering trades, transfers, balances, and DEX activity, plus real-time delivery over WebSocket streams. Access is metered per API point and stream-minute, with a 7-day free trial that unlocks the full streaming tier before billing kicks in. Tokens are issued through an OAuth2 client-credentials flow rather than a static key.

Blockscout is the open-source, EVM-compatible block explorer behind dozens of public chain explorers (Ethereum mainnet, its L2s, and more), and its REST v2 API exposes the same block, address, token, and transaction data that powers those explorer UIs. No signup or API key is required for the per-instance hosted public REST API, though anonymous callers are rate-limited per endpoint (confirmed live: `x-ratelimit-limit` varies by route, e.g. 180 on an address lookup vs. 10 on `/stats`); docs.blockscout.com also flags this per-instance API for deprecation in favor of a separate, paid, API-key-gated multichain "PRO API," though the free per-instance API this entry tracks was still live and keyless as of this run's probe. Every response is JSON.