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Mempool vs Block Lottos

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

APIMempoolNEW—Block LottosNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
Authnonenone
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverified (open-source project)Unverified
Free tierFree public API; no key for basic usageFree, no key (API docs state no key required)
Rate limitEnforced — HTTP 429 on excess, repeated abuse may be banned; numeric limits unpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

Mempool vs Block Lottos: common questions

Which is more reliable, Mempool or Block Lottos?

On our scheduled checks, Block Lottos leads on measured uptime — Mempool at —% versus Block Lottos 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 Mempool and Block Lottos need an API key?

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

Can I call Mempool and Block Lottos from the browser?

Yes — both Mempool and Block Lottos 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 Mempool and Block Lottos free for commercial use?

Mempool has unclear commercial terms, and Block Lottos 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.