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Free Dictionary vs KDP Intelligence

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

APIFree DictionaryNEW—KDP IntelligenceNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
Authnonenone
CORSyesno
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseContent under source licenses (CC BY-SA 4.0 seen on entries)Unverified
Free tierFree — limits not publishedFree preview/check endpoints; full niche data is paid via x402 USDC
Rate limit450 req/window · 417 remaining · resets 1783512354Unpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

Free Dictionary vs KDP Intelligence: common questions

Which is more reliable, Free Dictionary or KDP Intelligence?

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

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

Can I call Free Dictionary and KDP Intelligence from the browser?

Only Free Dictionary 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 Free Dictionary and KDP Intelligence free for commercial use?

Free Dictionary has unclear commercial terms, and KDP Intelligence 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.