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BlockCypher vs Pharos API

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

APIBlockCypherNEW—Pharos APINEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthnoneapiKey
CORSnono
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree — limits not publishedFree tier — API key required
Rate limitRetry-After: 1787sUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

BlockCypher vs Pharos API: common questions

Which is more reliable, BlockCypher or Pharos API?

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

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

Can I call BlockCypher and Pharos API from the browser?

Neither sends browser-friendly CORS headers reliably, so call BlockCypher and Pharos API from a server or proxy rather than client-side. The CORS and HTTPS rows above show exactly what we detected for each.

Are BlockCypher and Pharos API free for commercial use?

BlockCypher 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.