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Blockchain vs Mempool

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

APIBlockchainNEW—MempoolNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
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Rate limitUnpublishedEnforced — HTTP 429 on excess, repeated abuse may be banned; numeric limits unpublished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, Mempool leads on measured uptime — Blockchain at —% versus Mempool 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 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.