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KDP Intelligence vs Wolne Lektury

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

APIKDP IntelligenceNEW—Wolne LekturyNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
Authnonenone
CORSnoyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedWorks are public domain or on free/Creative Commons licenses (per WolneLektury); API terms not formally stated
Free tierFree preview/check endpoints; full niche data is paid via x402 USDCFree — limits not published
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

KDP Intelligence vs Wolne Lektury: common questions

Which is more reliable, KDP Intelligence or Wolne Lektury?

On our scheduled checks, Wolne Lektury leads on measured uptime — KDP Intelligence at —% versus Wolne Lektury 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 KDP Intelligence and Wolne Lektury need an API key?

Neither needs a paid key — KDP Intelligence is callable with no signup, and Wolne Lektury is callable with no signup. Both are quick to prototype with; rate limits still apply.

Can I call KDP Intelligence and Wolne Lektury from the browser?

Only Wolne Lektury is browser-friendly — it returns CORS headers over HTTPS. KDP Intelligence needs a server-side call or proxy, so factor that into which one fits a front-end project.

Are KDP Intelligence and Wolne Lektury free for commercial use?

KDP Intelligence has unclear commercial terms, and Wolne Lektury 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.