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BulkSMS JSON REST API vs Resend

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

APIBulkSMS JSON REST APIDEAD0ResendDEAD0
Uptime · 30d
Uptime · 90d0.0%0.0%
Uptime · 30d0.0%0.0%
P50 · ms——
P95 · ms——
AuthapiKeyapiKey
CORSnono
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

BulkSMS JSON REST API vs Resend: common questions

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

Both are neck-and-neck — BulkSMS JSON REST API and Resend each measure 0.0% 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.

Do BulkSMS JSON REST API and Resend need an API key?

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

Neither sends browser-friendly CORS headers reliably, so call BulkSMS JSON REST API and Resend from a server or proxy rather than client-side. The CORS and HTTPS rows above show exactly what we detected for each.

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

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