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Chronicling America vs GLEIF LEI API

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

APIChronicling AmericaNEW—GLEIF LEI APINEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
Authnonenone
CORSnoyes
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Rate limitLoC throttles heavy crawling (see LoC API policy)Unpublished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 GLEIF LEI API: common questions

Which is more reliable, Chronicling America or GLEIF LEI API?

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

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

Can I call Chronicling America and GLEIF LEI API from the browser?

Only GLEIF LEI API is browser-friendly — it returns CORS headers over HTTPS. Chronicling America needs a server-side call or proxy, so factor that into which one fits a front-end project.

Are Chronicling America and GLEIF LEI API free for commercial use?

Chronicling America allows commercial use on its free tier, and GLEIF LEI 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.