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OpenHolidays API vs Vonage (Nexmo) API

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

APIOpenHolidays APIHEALTHY94Vonage (Nexmo) APIHEALTHY94
Uptime · 30d
Uptime · 90d100%100%
Uptime · 30d100%100%
P50 · ms533507
P95 · ms39201019
AuthnoneapiKey
CORSyesno
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree — limits not publishedFree tier — API key required
Rate limitUnpublished10, 120;w=60;name="crd|generic_key^nexmo-gloo.sanity-service-remote-address-120-rpm|remote_address", 10;w=1;name="crd|generic_key^nexmo-gloo.sanity-service-remote-address-10-rps|remote_address" req/window · 9 remaining · resets 1
In directory since2026-07-052026-07-05
operationalpartialdownno data

OpenHolidays API vs Vonage (Nexmo) API: common questions

Which is more reliable, OpenHolidays API or Vonage (Nexmo) API?

Both are neck-and-neck — OpenHolidays API and Vonage (Nexmo) API each measure 100% uptime over 90 days on our probe schedule. Reliability here is verified from our own scheduled checks; use the 30-day bars above to see which has been steadier lately.

Which is faster, OpenHolidays API or Vonage (Nexmo) API?

Vonage (Nexmo) API has the lower median latency in our checks — OpenHolidays API responds in 533 ms versus Vonage (Nexmo) API at 507 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 OpenHolidays API and Vonage (Nexmo) API need an API key?

OpenHolidays API needs no key, while Vonage (Nexmo) API requires a free API key. If you want to start calling without signup, reach for OpenHolidays API first.

Can I call OpenHolidays API and Vonage (Nexmo) API from the browser?

Only OpenHolidays API is browser-friendly — it returns CORS headers over HTTPS. Vonage (Nexmo) API needs a server-side call or proxy, so factor that into which one fits a front-end project.

Are OpenHolidays API and Vonage (Nexmo) API free for commercial use?

OpenHolidays API has unclear commercial terms, and Vonage (Nexmo) API 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.