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MailCheck.ai vs Telnyx API

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

APIMailCheck.aiHEALTHY93Telnyx APIHEALTHY97
Uptime · 30d
Uptime · 90d93.1%100%
Uptime · 30d93.3%100%
P50 · ms272246
P95 · ms842570
AuthnoneapiKey
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree — limits not publishedFree tier — API key required
Rate limit5 req/window · 4 remaining50, 50;w=1 req/window · 49 remaining · resets 1
In directory since2026-07-052026-07-05
operationalpartialdownno data

MailCheck.ai vs Telnyx API: common questions

Which is more reliable, MailCheck.ai or Telnyx API?

On our scheduled checks, Telnyx API leads on measured uptime — MailCheck.ai at 93.1% versus Telnyx API at 100% 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, MailCheck.ai or Telnyx API?

Telnyx API has the lower median latency in our checks — MailCheck.ai responds in 272 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 MailCheck.ai and Telnyx API need an API key?

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

Can I call MailCheck.ai and Telnyx API from the browser?

Yes — both MailCheck.ai 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 MailCheck.ai and Telnyx API free for commercial use?

MailCheck.ai 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.