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Fedora Messaging API vs The Calendar

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

APIFedora Messaging APINEW—The CalendarNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
Authnonenone
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified (US federal list per 5 U.S.C. § 6103)
Free tierFree — limits not publishedFree, no auth (per site)
Rate limitUnpublishedNone stated (site advertises no rate limit)
In directory since2026-07-052026-07-05
operationalpartialdownno data

Fedora Messaging API vs The Calendar: common questions

Which is more reliable, Fedora Messaging API or The Calendar?

On our scheduled checks, The Calendar leads on measured uptime — Fedora Messaging API at —% versus The Calendar 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 Fedora Messaging API and The Calendar need an API key?

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

Can I call Fedora Messaging API and The Calendar from the browser?

Yes — both Fedora Messaging API and The Calendar 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 Fedora Messaging API and The Calendar free for commercial use?

Fedora Messaging API has unclear commercial terms, and The Calendar 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.