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FinSignals API vs PostStack

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

APIFinSignals APINEW—PostStackNEW—
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 — key may be required
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

FinSignals API vs PostStack: common questions

Which is more reliable, FinSignals API or PostStack?

On our scheduled checks, PostStack leads on measured uptime — FinSignals API at —% versus PostStack 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 FinSignals API and PostStack need an API key?

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

Can I call FinSignals API and PostStack from the browser?

Only FinSignals 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 FinSignals API and PostStack free for commercial use?

FinSignals 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.