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Chronicling America vs UUID Generator API

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

APIChronicling AmericaNEW—UUID Generator APINEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
Authnonenone
CORSnono
HTTPSyesyes
Card requirednono
Commercial useyesunclear
Data licensePublic domain / no known copyright (Library of Congress)Unverified
Free tierFree — public-domain collection dataFree — limits not published
Rate limitLoC throttles heavy crawling (see LoC API policy)Unpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

Chronicling America vs UUID Generator API: common questions

Which is more reliable, Chronicling America or UUID Generator API?

On our scheduled checks, UUID Generator API leads on measured uptime — Chronicling America at —% versus UUID Generator 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 Chronicling America and UUID Generator API need an API key?

Neither needs a paid key — Chronicling America is callable with no signup, and UUID Generator API is callable with no signup. Both are quick to prototype with; rate limits still apply.

Can I call Chronicling America and UUID Generator API from the browser?

Neither sends browser-friendly CORS headers reliably, so call Chronicling America and UUID Generator API from a server or proxy rather than client-side. The CORS and HTTPS rows above show exactly what we detected for each.

Are Chronicling America and UUID Generator API free for commercial use?

Chronicling America allows commercial use on its free tier, and UUID Generator 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.