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Ntropy Transaction API v1 vs The Calendar

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

APINtropy Transaction API v1NEW—The CalendarNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
Authnonenone
CORSnoyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified (US federal list per 5 U.S.C. § 6103)
Free tierFree — limits not publishedFree, no auth (per site)
Rate limitUnpublishedNone stated (site advertises no rate limit)
In directory since2026-07-052026-07-05
operationalpartialdownno data

Ntropy Transaction API v1 vs The Calendar: common questions

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

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

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

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

Only The 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 Ntropy Transaction API v1 and The Calendar free for commercial use?

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