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Ntropy Transaction API v1 vs The SMS Works API

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

APINtropy Transaction API v1NEW—The SMS Works APINEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthnoneapiKey
CORSnoyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree — limits not publishedFree tier — API key required
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

Ntropy Transaction API v1 vs The SMS Works API: common questions

Which is more reliable, Ntropy Transaction API v1 or The SMS Works API?

On our scheduled checks, The SMS Works API leads on measured uptime — Ntropy Transaction API v1 at —% versus The SMS Works 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 Ntropy Transaction API v1 and The SMS Works API need an API key?

Ntropy Transaction API v1 needs no key, while The SMS Works API requires a free API key. If you want to start calling without signup, reach for Ntropy Transaction API v1 first.

Can I call Ntropy Transaction API v1 and The SMS Works API from the browser?

Only The SMS Works API is browser-friendly — it returns CORS headers over HTTPS. Ntropy Transaction API v1 needs a server-side call or proxy, so factor that into which one fits a front-end project.

Are Ntropy Transaction API v1 and The SMS Works API free for commercial use?

Ntropy Transaction API v1 has unclear commercial terms, and The SMS Works 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.