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Free Public APIs API vs Registrum API

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

APIFree Public APIs APINEW—Registrum APINEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthnoneapiKey
CORSyesno
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree — limits not publishedFree tier — API key required
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

Free Public APIs API vs Registrum API: common questions

Which is more reliable, Free Public APIs API or Registrum API?

On our scheduled checks, Registrum API leads on measured uptime — Free Public APIs API at —% versus Registrum 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 Free Public APIs API and Registrum API need an API key?

Free Public APIs API needs no key, while Registrum API requires a free API key. If you want to start calling without signup, reach for Free Public APIs API first.

Can I call Free Public APIs API and Registrum API from the browser?

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

Are Free Public APIs API and Registrum API free for commercial use?

Free Public APIs API has unclear commercial terms, and Registrum 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.