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OWASP API Security Project vs The Guardian

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

APIOWASP API Security ProjectNEW—The GuardianNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthnoneapiKey
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree — limits not publishedFree developer key — registration required
Rate limitUnpublished5000 calls/day (developer tier)
In directory since2026-07-052026-07-05
operationalpartialdownno data

OWASP API Security Project vs The Guardian: common questions

Which is more reliable, OWASP API Security Project or The Guardian?

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

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

Can I call OWASP API Security Project and The Guardian from the browser?

Yes — both OWASP API Security Project and The Guardian send CORS headers over HTTPS, so front-end code can fetch either directly with no backend proxy. That makes them easy to swap in a client-side app while you compare responses.

Are OWASP API Security Project and The Guardian free for commercial use?

OWASP API Security Project has unclear commercial terms, and The Guardian 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.