Blockscout vs Covalent

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.

Covalent's blockchain-data platform rebranded to GoldRush, unifying wallet balances, transaction history, NFT ownership, and token/DEX pricing across 100+ EVM and non-EVM chains behind one API, plus JSON-RPC endpoints for 30+ EVM networks. New accounts get a 14-day trial (25,000 credits) before moving to a paid plan or per-request (x402) billing with no monthly minimum. All data comes back as JSON.