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caldays vs Telnyx API

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

APIcaldaysHEALTHY99Telnyx APIHEALTHY97
Uptime · 30d
Uptime · 90d100%100%
Uptime · 30d100%100%
P50 · ms149246
P95 · ms675570
AuthnoneapiKey
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree — limits not publishedFree tier — API key required
Rate limitUnpublished50, 50;w=1 req/window · 49 remaining · resets 1
In directory since2026-07-052026-07-05
operationalpartialdownno data

caldays vs Telnyx API: common questions

Which is more reliable, caldays or Telnyx API?

Both are neck-and-neck — caldays and Telnyx 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, caldays or Telnyx API?

caldays has the lower median latency in our checks — caldays responds in 149 ms versus Telnyx API at 246 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 caldays and Telnyx API need an API key?

caldays needs no key, while Telnyx API requires a free API key. If you want to start calling without signup, reach for caldays first.

Can I call caldays and Telnyx API from the browser?

Yes — both caldays and Telnyx API send CORS headers over HTTPS, so front-end code can fetch either directly with no backend proxy. That makes them easy to swap in a client-side app while you compare responses.

Are caldays and Telnyx API free for commercial use?

caldays has unclear commercial terms, and Telnyx 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.