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Blockchain vs BlockCypher

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

APIBlockchainHEALTHY95BlockCypherDYING59
Uptime · 30d
Uptime · 90d99.02%30.4%
Uptime · 30d98.3%36.7%
P50 · ms445145
P95 · ms11141129
AuthapiKeynone
CORSnono
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree tier — key may be requiredFree — limits not published
Rate limitRetry-After: 47655sRetry-After: 1787s
In directory since2026-07-052026-07-05
operationalpartialdownno data

Blockchain vs BlockCypher: common questions

Which is more reliable, Blockchain or BlockCypher?

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

BlockCypher has the lower median latency in our checks — Blockchain responds in 445 ms versus BlockCypher at 145 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 BlockCypher need an API key?

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

Can I call Blockchain and BlockCypher from the browser?

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

Are Blockchain and BlockCypher free for commercial use?

Blockchain has unclear commercial terms, and BlockCypher 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.