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The Guardian vs UUID Generator API

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

APIThe GuardianNEW—UUID Generator APINEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthapiKeynone
CORSyesno
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree developer key — registration requiredFree — limits not published
Rate limit5000 calls/day (developer tier)Unpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

The Guardian vs UUID Generator API: common questions

Which is more reliable, The Guardian or UUID Generator API?

On our scheduled checks, UUID Generator API leads on measured uptime — The Guardian at —% versus UUID Generator 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 The Guardian and UUID Generator API need an API key?

UUID Generator API needs no key, while The Guardian requires a free API key. If you want to start calling without signup, reach for UUID Generator API first.

Can I call The Guardian and UUID Generator API from the browser?

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

Are The Guardian and UUID Generator API free for commercial use?

The Guardian has unclear commercial terms, and UUID Generator 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.