shipapis
StarSubmit an APISubmit API

Chronicling America vs Data.parliament.uk API

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

APIChronicling AmericaNEW—Data.parliament.uk APINEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthnoneapiKey
CORSnoyes
HTTPSyesyes
Card requirednono
Commercial useyesunclear
Data licensePublic domain / no known copyright (Library of Congress)Unverified
Free tierFree — public-domain collection dataFree tier — API key required
Rate limitLoC throttles heavy crawling (see LoC API policy)Unpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

Chronicling America vs Data.parliament.uk API: common questions

Which is more reliable, Chronicling America or Data.parliament.uk API?

On our scheduled checks, Data.parliament.uk API leads on measured uptime — Chronicling America at —% versus Data.parliament.uk 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 Data.parliament.uk API need an API key?

Chronicling America needs no key, while Data.parliament.uk API requires a free API key. If you want to start calling without signup, reach for Chronicling America first.

Can I call Chronicling America and Data.parliament.uk API from the browser?

Only Data.parliament.uk 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 Data.parliament.uk API free for commercial use?

Chronicling America allows commercial use on its free tier, and Data.parliament.uk 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.