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Blockchain vs Blockchair

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

APIBlockchainHEALTHY95BlockchairHEALTHY91
Uptime · 30d
Uptime · 90d99.02%98.0%
Uptime · 30d98.3%98.3%
P50 · ms445729
P95 · ms11141323
AuthapiKeynone
CORSnoyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree tier — key may be requiredFree — limits not published
Rate limitRetry-After: 47655sUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

Blockchain vs Blockchair: common questions

Which is more reliable, Blockchain or Blockchair?

On our scheduled checks, Blockchain leads on measured uptime — Blockchain at 99.02% versus Blockchair at 98.0% over 90 days. These are our own probe results, not provider claims; the uptime bars above show the day-by-day record for both.

Which is faster, Blockchain or Blockchair?

Blockchain has the lower median latency in our checks — Blockchain responds in 445 ms versus Blockchair at 729 ms (P50). Tail latency (P95) is in the table above; for most workloads the median is the number that shapes how the API feels.

Do Blockchain and Blockchair need an API key?

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

Can I call Blockchain and Blockchair from the browser?

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

Are Blockchain and Blockchair free for commercial use?

Blockchain has unclear commercial terms, and Blockchair 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.