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Blockchain.info vs Pharos API

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

APIBlockchain.infoNEW—Pharos APINEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthnoneapiKey
CORSyesno
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 Pharos API: common questions

Which is more reliable, Blockchain.info or Pharos API?

On our scheduled checks, Pharos API leads on measured uptime — Blockchain.info at —% versus Pharos API 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 Pharos API need an API key?

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

Can I call Blockchain.info and Pharos API from the browser?

Only Blockchain.info is browser-friendly — it returns CORS headers over HTTPS. Pharos API needs a server-side call or proxy, so factor that into which one fits a front-end project.

Are Blockchain.info and Pharos API free for commercial use?

Blockchain.info has unclear commercial terms, and Pharos API 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.