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Bluesky vs FinSignals API

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

APIBlueskyNEW—FinSignals APINEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
Authnonenone
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree — public AppView, no keyFree — limits not published
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

Bluesky vs FinSignals API: common questions

Which is more reliable, Bluesky or FinSignals API?

On our scheduled checks, FinSignals API leads on measured uptime — Bluesky at —% versus FinSignals API 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 Bluesky and FinSignals API need an API key?

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

Can I call Bluesky and FinSignals API from the browser?

Yes — both Bluesky and FinSignals API 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 Bluesky and FinSignals API free for commercial use?

Bluesky has unclear commercial terms, and FinSignals API 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.