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Fedora Messaging API vs PostStack

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

APIFedora Messaging APIHEALTHY58PostStackHEALTHY87
Uptime · 30d
Uptime · 90d97.1%100%
Uptime · 30d98.3%100%
P50 · ms15101066
P95 · ms49751890
AuthnoneapiKey
CORSyesno
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree — limits not publishedFree tier — key may be required
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

Fedora Messaging API vs PostStack: common questions

Which is more reliable, Fedora Messaging API or PostStack?

On our scheduled checks, PostStack leads on measured uptime — Fedora Messaging API at 97.1% versus PostStack at 100% over 90 days. These are our own probe results, not provider claims; the uptime bars above show the day-by-day record for both.

Which is faster, Fedora Messaging API or PostStack?

PostStack has the lower median latency in our checks — Fedora Messaging API responds in 1510 ms versus PostStack at 1066 ms (P50). Tail latency (P95) is in the table above; for most workloads the median is the number that shapes how the API feels.

Do Fedora Messaging API and PostStack need an API key?

Fedora Messaging API needs no key, while PostStack requires a free API key. If you want to start calling without signup, reach for Fedora Messaging API first.

Can I call Fedora Messaging API and PostStack from the browser?

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

Are Fedora Messaging API and PostStack free for commercial use?

Fedora Messaging API has unclear commercial terms, and PostStack 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.