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BulkSMS JSON REST API vs ImprovMX API

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

APIBulkSMS JSON REST APINEW—ImprovMX APINEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthapiKeyapiKey
CORSnoyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree tier — API key requiredFree tier — API key required
Rate limitUnpublished301 req/window · 300 remaining · resets 1783526520
In directory since2026-07-052026-07-05
operationalpartialdownno data

BulkSMS JSON REST API vs ImprovMX API: common questions

Which is more reliable, BulkSMS JSON REST API or ImprovMX API?

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

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

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

Are BulkSMS JSON REST API and ImprovMX API free for commercial use?

BulkSMS JSON REST API has unclear commercial terms, and ImprovMX 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.