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Blockchair vs Block Lottos

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

APIBlockchairNEW—Block LottosNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
Authnonenone
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree — limits not publishedFree, no key (API docs state no key required)
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

Blockchair vs Block Lottos: common questions

Which is more reliable, Blockchair or Block Lottos?

On our scheduled checks, Block Lottos leads on measured uptime — Blockchair 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 Blockchair and Block Lottos need an API key?

Neither needs a paid key — Blockchair 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 Blockchair and Block Lottos from the browser?

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

Blockchair 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.