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BulkSMS JSON REST API vs The Calendar

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

APIBulkSMS JSON REST APIUNMONITORED—The CalendarNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthapiKeynone
CORSnoyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified (US federal list per 5 U.S.C. § 6103)
Free tierFree tier — API key requiredFree, no auth (per site)
Rate limitUnpublishedNone stated (site advertises no rate limit)
In directory since2026-07-052026-07-05
operationalpartialdownno data

BulkSMS JSON REST API vs The Calendar: common questions

Which is more reliable, BulkSMS JSON REST API or The Calendar?

Only The Calendar is on our probe schedule so far (—% uptime over 90 days). The other is catalogued but not yet live-checked, so we can't compare measured reliability head-to-head — check the uncovered API's own status page for now.

Do BulkSMS JSON REST API and The Calendar need an API key?

The Calendar needs no key, while BulkSMS JSON REST API requires a free API key. If you want to start calling without signup, reach for The Calendar first.

Can I call BulkSMS JSON REST API and The Calendar from the browser?

Only The Calendar 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 The Calendar free for commercial use?

BulkSMS JSON REST API has unclear commercial terms, and The Calendar 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.