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NuGet V3 API vs Open Library

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

APINuGet V3 APIUNMONITORED—Open LibraryHEALTHY—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
Authnonenone
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedMixed — mostly open
Free tierFree — limits not publishedUnlimited within courtesy limits
Rate limitUnpublishedSoft — identified UA appreciated
In directory since2026-07-052026-05-02
operationalpartialdownno data

NuGet V3 API vs Open Library: common questions

Which is more reliable, NuGet V3 API or Open Library?

Only Open Library 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 NuGet V3 API and Open Library need an API key?

Neither needs a paid key — NuGet V3 API is callable with no signup, and Open Library is callable with no signup. Both are quick to prototype with; rate limits still apply.

Can I call NuGet V3 API and Open Library from the browser?

Yes — both NuGet V3 API and Open Library 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 NuGet V3 API and Open Library free for commercial use?

NuGet V3 API has unclear commercial terms, and Open Library 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.