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PostStack vs Vonage (Nexmo) API

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

APIPostStackHEALTHY87Vonage (Nexmo) APIHEALTHY94
Uptime · 30d
Uptime · 90d100%100%
Uptime · 30d100%100%
P50 · ms1066507
P95 · ms18901019
AuthapiKeyapiKey
CORSnono
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree tier — key may be requiredFree 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

PostStack vs Vonage (Nexmo) API: common questions

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

Both are neck-and-neck — PostStack 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, PostStack or Vonage (Nexmo) API?

Vonage (Nexmo) API has the lower median latency in our checks — PostStack responds in 1066 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 PostStack and Vonage (Nexmo) API need an API key?

Both ask you to authenticate — PostStack uses an API key and Vonage (Nexmo) API uses an API key. Each key is free to obtain; the Auth and Card-required rows above spell out the signup terms.

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

Neither sends browser-friendly CORS headers reliably, so call PostStack and Vonage (Nexmo) API from a server or proxy rather than client-side. The CORS and HTTPS rows above show exactly what we detected for each.

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

PostStack 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.