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httpSMS vs Vercel API

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

APIhttpSMSNEW—Vercel APINEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthapiKeyapiKey
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree tier — API key requiredFree tier — API key required
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

httpSMS vs Vercel API: common questions

Which is more reliable, httpSMS or Vercel API?

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

Both ask you to authenticate — httpSMS uses an API key and Vercel 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 httpSMS and Vercel API from the browser?

Yes — both httpSMS and Vercel 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 httpSMS and Vercel API free for commercial use?

httpSMS has unclear commercial terms, and Vercel 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.