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Blockchain vs Mempool

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

APIBlockchainHEALTHY95MempoolHEALTHY89
Uptime · 30d
Uptime · 90d99.02%86.3%
Uptime · 30d98.3%90.0%
P50 · ms445100
P95 · ms11142258
AuthapiKeynone
CORSnoyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified (open-source project)
Free tierFree tier — key may be requiredFree public API; no key for basic usage
Rate limitRetry-After: 47655sEnforced — HTTP 429 on excess, repeated abuse may be banned; numeric limits unpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

Blockchain vs Mempool: common questions

Which is more reliable, Blockchain or Mempool?

On our scheduled checks, Blockchain leads on measured uptime — Blockchain at 99.02% 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 or Mempool?

Mempool has the lower median latency in our checks — Blockchain responds in 445 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 and Mempool need an API key?

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

Can I call Blockchain and Mempool from the browser?

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

Are Blockchain and Mempool free for commercial use?

Blockchain 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.