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Blockchair vs Kraken

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

APIBlockchairNEW—KrakenNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
Authnonenone
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree — limits not publishedFree — limits not published
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

Blockchair vs Kraken: common questions

Which is more reliable, Blockchair or Kraken?

On our scheduled checks, Kraken leads on measured uptime — Blockchair at —% versus Kraken 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 Kraken need an API key?

Neither needs a paid key — Blockchair is callable with no signup, and Kraken is callable with no signup. Both are quick to prototype with; rate limits still apply.

Can I call Blockchair and Kraken from the browser?

Yes — both Blockchair and Kraken 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 Blockchair and Kraken free for commercial use?

Blockchair has unclear commercial terms, and Kraken 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.