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Fixer API vs NuGet V3 API

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

APIFixer APINEW—NuGet V3 APINEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthapiKeynone
CORSnoyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree tier — API key requiredFree — limits not published
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

Fixer API vs NuGet V3 API: common questions

Which is more reliable, Fixer API or NuGet V3 API?

On our scheduled checks, NuGet V3 API leads on measured uptime — Fixer API at —% versus NuGet V3 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 Fixer API and NuGet V3 API need an API key?

NuGet V3 API needs no key, while Fixer API requires a free API key. If you want to start calling without signup, reach for NuGet V3 API first.

Can I call Fixer API and NuGet V3 API from the browser?

Only NuGet V3 API 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 Fixer API and NuGet V3 API free for commercial use?

Fixer API has unclear commercial terms, and NuGet V3 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.