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Perplexity AI API vs Open Notify

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

APIPerplexity AI APIUNMONITORED—Open NotifyDYING—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthapiKeynone
CORSyesyes
HTTPSyesno
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedn/a
Free tierFree tier — API key requiredUnlimited (volunteer-run)
Rate limitUnpublishedPlease be gentle
In directory since2026-07-052026-05-02
operationalpartialdownno data

Perplexity AI API vs Open Notify: common questions

Which is more reliable, Perplexity AI API or Open Notify?

Only Open Notify is on our probe schedule so far (—% uptime over 90 days). The other is catalogued but not yet live-checked, so we can't compare measured reliability head-to-head — check the uncovered API's own status page for now.

Do Perplexity AI API and Open Notify need an API key?

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

Can I call Perplexity AI API and Open Notify from the browser?

Only Perplexity AI 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 Perplexity AI API and Open Notify free for commercial use?

Perplexity AI API has unclear commercial terms, and Open Notify 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.