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HasData: Structured Web Data APIs vs Open Library

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

APIHasData: Structured Web Data APIsHEALTHY70Open LibraryHEALTHY73
Uptime · 30d
Uptime · 90d100%88.2%
Uptime · 30d100%81.7%
P50 · ms7681629
P95 · ms14644878
AuthapiKeynone
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedMixed — mostly open
Free tierFree tier — API key requiredUnlimited within courtesy limits
Rate limitUnpublishedSoft — identified UA appreciated
In directory since2026-07-052026-05-02
operationalpartialdownno data

HasData: Structured Web Data APIs vs Open Library: common questions

Which is more reliable, HasData: Structured Web Data APIs or Open Library?

On our scheduled checks, HasData: Structured Web Data APIs leads on measured uptime — HasData: Structured Web Data APIs at 100% versus Open Library at 88.2% over 90 days. These are our own probe results, not provider claims; the uptime bars above show the day-by-day record for both.

Which is faster, HasData: Structured Web Data APIs or Open Library?

HasData: Structured Web Data APIs has the lower median latency in our checks — HasData: Structured Web Data APIs responds in 768 ms versus Open Library at 1629 ms (P50). Tail latency (P95) is in the table above; for most workloads the median is the number that shapes how the API feels.

Do HasData: Structured Web Data APIs and Open Library need an API key?

Open Library needs no key, while HasData: Structured Web Data APIs requires a free API key. If you want to start calling without signup, reach for Open Library first.

Can I call HasData: Structured Web Data APIs and Open Library from the browser?

Yes — both HasData: Structured Web Data APIs 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 HasData: Structured Web Data APIs and Open Library free for commercial use?

HasData: Structured Web Data APIs 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.