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Blockchain.info vs OpenSea

Same instrument, two spec sheets — measured, not claimed.

APIBlockchain.infoNEW—OpenSeaNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthnoneapiKey
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree — limits not publishedFree tier — API key required
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

Blockchain.info vs OpenSea: common questions

Which is more reliable, Blockchain.info or OpenSea?

On our scheduled checks, OpenSea leads on measured uptime — Blockchain.info at —% versus OpenSea at —% over 90 days. These are our own probe results, not provider claims; the uptime bars above show the day-by-day record for both.

Do Blockchain.info and OpenSea need an API key?

Blockchain.info needs no key, while OpenSea requires a free API key. If you want to start calling without signup, reach for Blockchain.info first.

Can I call Blockchain.info and OpenSea from the browser?

Yes — both Blockchain.info and OpenSea send CORS headers over HTTPS, so front-end code can fetch either directly with no backend proxy. That makes them easy to swap in a client-side app while you compare responses.

Are Blockchain.info and OpenSea free for commercial use?

Blockchain.info has unclear commercial terms, and OpenSea has unclear commercial terms. We track service terms and the data license as separate fields — see the Commercial use and Data license rows above, and confirm both before shipping either in a paid product.