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Open Notify vs Stock Sentiment API

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

APIOpen NotifyDYING—Stock Sentiment APINEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthnoneapiKey
CORSyesyes
HTTPSnoyes
Card requirednono
Commercial useunclearunclear
Data licensen/aUnverified
Free tierUnlimited (volunteer-run)Free tier — API key may be required for production
Rate limitPlease be gentleUnpublished
In directory since2026-05-022026-07-05
operationalpartialdownno data

Open Notify vs Stock Sentiment API: common questions

Which is more reliable, Open Notify or Stock Sentiment API?

On our scheduled checks, Stock Sentiment API leads on measured uptime — Open Notify at —% versus Stock Sentiment 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 Open Notify and Stock Sentiment API need an API key?

Open Notify needs no key, while Stock Sentiment API requires a free API key. If you want to start calling without signup, reach for Open Notify first.

Can I call Open Notify and Stock Sentiment API from the browser?

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

Are Open Notify and Stock Sentiment API free for commercial use?

Open Notify has unclear commercial terms, and Stock Sentiment 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.