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ImprovMX API vs Nexmo API

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

APIImprovMX APINEW—Nexmo APINEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthapiKeyapiKey
CORSyesno
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree tier — API key requiredFree tier — API key required
Rate limit301 req/window · 300 remaining · resets 178352652010, 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

ImprovMX API vs Nexmo API: common questions

Which is more reliable, ImprovMX API or Nexmo API?

On our scheduled checks, Nexmo API leads on measured uptime — ImprovMX API at —% versus Nexmo API 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 ImprovMX API and Nexmo API need an API key?

Both ask you to authenticate — ImprovMX API uses an API key and 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 ImprovMX API and Nexmo API from the browser?

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

Are ImprovMX API and Nexmo API free for commercial use?

ImprovMX API has unclear commercial terms, and 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.