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Ntropy Transaction API v1 vs PostStack

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

APINtropy Transaction API v1NEW—PostStackNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthnoneapiKey
CORSnono
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

Ntropy Transaction API v1 vs PostStack: common questions

Which is more reliable, Ntropy Transaction API v1 or PostStack?

On our scheduled checks, PostStack leads on measured uptime — Ntropy Transaction API v1 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 Ntropy Transaction API v1 and PostStack need an API key?

Ntropy Transaction API v1 needs no key, while PostStack requires a free API key. If you want to start calling without signup, reach for Ntropy Transaction API v1 first.

Can I call Ntropy Transaction API v1 and PostStack from the browser?

Neither sends browser-friendly CORS headers reliably, so call Ntropy Transaction API v1 and PostStack from a server or proxy rather than client-side. The CORS and HTTPS rows above show exactly what we detected for each.

Are Ntropy Transaction API v1 and PostStack free for commercial use?

Ntropy Transaction API v1 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.