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CIRCL CVE Search vs Fixer API

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

APICIRCL CVE SearchNEW—Fixer APINEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthapiKeyapiKey
CORSyesno
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

CIRCL CVE Search vs Fixer API: common questions

Which is more reliable, CIRCL CVE Search or Fixer API?

On our scheduled checks, Fixer API leads on measured uptime — CIRCL CVE Search at —% versus Fixer 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 CIRCL CVE Search and Fixer API need an API key?

Both ask you to authenticate — CIRCL CVE Search uses an API key and Fixer 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 CIRCL CVE Search and Fixer API from the browser?

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

Are CIRCL CVE Search and Fixer API free for commercial use?

CIRCL CVE Search has unclear commercial terms, and Fixer 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.