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Namedays Calendar vs Ntropy Transaction API v1

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

APINamedays CalendarDYING88Ntropy Transaction API v1HEALTHY79
Uptime · 30d
Uptime · 90d91.2%98.0%
Uptime · 30d85.0%96.7%
P50 · ms4801223
P95 · ms27494484
Authnonenone
CORSnono
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree — limits not publishedFree — limits not published
Rate limit60 req/window · 58 remainingUnpublished
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 91.2% versus Ntropy Transaction API v1 at 98.0% 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, Namedays Calendar or Ntropy Transaction API v1?

Namedays Calendar has the lower median latency in our checks — Namedays Calendar responds in 480 ms versus Ntropy Transaction API v1 at 1223 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 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?

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

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.