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Use search when the broad directory stops being enough. Filter by category, auth, CORS, signup friction, and result freshness until the shortlist becomes obvious.
Start with category and auth when you know the integration shape. Use free, signup, and CORS flags when you are trying to remove setup friction.
Sort by verification or response time when the final call is about reliability, not just category fit.
2 results after 1 active filters. Remove any one below without losing the rest of the cut.
Blockchain.com API
Blockchain.com (formerly Blockchain.info) API provides Bitcoin block explorer data — BTC address balance, transactions, blocks, market quotes, Wallet API.
Glassnode API
Glassnode API provides crypto on-chain data and market metrics — BTC/ETH holder distribution, exchange inflows/outflows, miner behavior, derivatives funding rates.