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Namedays Calendar vs Ntropy Transaction API v1

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

APINamedays CalendarNEW—Ntropy Transaction API v1NEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
Authnonenone
CORSyesno
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree — limits not publishedFree — limits not published
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

Namedays Calendar vs Ntropy Transaction API v1: common questions

Which is more reliable, Namedays Calendar or Ntropy Transaction API v1?

On our scheduled checks, Ntropy Transaction API v1 leads on measured uptime — Namedays Calendar at —% versus Ntropy Transaction API v1 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 Namedays Calendar and Ntropy Transaction API v1 need an API key?

Neither needs a paid key — Namedays Calendar is callable with no signup, and Ntropy Transaction API v1 is callable with no signup. Both are quick to prototype with; rate limits still apply.

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

Only Namedays Calendar is browser-friendly — it returns CORS headers over HTTPS. Ntropy Transaction API v1 needs a server-side call or proxy, so factor that into which one fits a front-end project.

Are Namedays Calendar and Ntropy Transaction API v1 free for commercial use?

Namedays Calendar has unclear commercial terms, and Ntropy Transaction API v1 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.