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Blockchair vs Gemini

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

APIBlockchairNEW—GeminiNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
Authnonenone
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree — limits not publishedPublic market data endpoints are keyless and free
Rate limitUnpublishedPublic API throttled per IP (specific numeric limit not confirmed at probe time)
In directory since2026-07-052026-07-05
operationalpartialdownno data

Blockchair vs Gemini: common questions

Which is more reliable, Blockchair or Gemini?

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

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

Can I call Blockchair and Gemini from the browser?

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

Blockchair has unclear commercial terms, and Gemini 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.