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Blockchair vs Pharos API

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

APIBlockchairNEW—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

Blockchair vs Pharos API: common questions

Which is more reliable, Blockchair or Pharos API?

On our scheduled checks, Pharos API leads on measured uptime — Blockchair 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 Blockchair and Pharos API need an API key?

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

Can I call Blockchair and Pharos API from the browser?

Only Blockchair 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 Blockchair and Pharos API free for commercial use?

Blockchair 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.