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Blockchain.info vs Mempool

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

APIBlockchain.infoHEALTHY95MempoolHEALTHY89
Uptime · 30d
Uptime · 90d100%86.3%
Uptime · 30d100%90.0%
P50 · ms397100
P95 · ms8702258
Authnonenone
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified (open-source project)
Free tierFree — limits not publishedFree public API; no key for basic usage
Rate limitUnpublishedEnforced — HTTP 429 on excess, repeated abuse may be banned; numeric limits unpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

Blockchain.info vs Mempool: common questions

Which is more reliable, Blockchain.info or Mempool?

On our scheduled checks, Blockchain.info leads on measured uptime — Blockchain.info at 100% versus Mempool at 86.3% 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.info or Mempool?

Mempool has the lower median latency in our checks — Blockchain.info responds in 397 ms versus Mempool at 100 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.info and Mempool need an API key?

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

Can I call Blockchain.info and Mempool from the browser?

Yes — both Blockchain.info and Mempool 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 Blockchain.info and Mempool free for commercial use?

Blockchain.info has unclear commercial terms, and Mempool 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.