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BlockCypher vs Gemini

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

APIBlockCypherDYING59GeminiHEALTHY89
Uptime · 30d
Uptime · 90d30.4%99.02%
Uptime · 30d36.7%98.3%
P50 · ms145674
P95 · ms11291865
Authnonenone
CORSnoyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree — limits not publishedPublic market data endpoints are keyless and free
Rate limitRetry-After: 1787sPublic API throttled per IP (specific numeric limit not confirmed at probe time)
In directory since2026-07-052026-07-05
operationalpartialdownno data

BlockCypher vs Gemini: common questions

Which is more reliable, BlockCypher or Gemini?

On our scheduled checks, Gemini leads on measured uptime — BlockCypher at 30.4% versus Gemini at 99.02% 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, BlockCypher or Gemini?

BlockCypher has the lower median latency in our checks — BlockCypher responds in 145 ms versus Gemini at 674 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 BlockCypher and Gemini need an API key?

Neither needs a paid key — BlockCypher 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 BlockCypher and Gemini from the browser?

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

Are BlockCypher and Gemini free for commercial use?

BlockCypher 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.