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Chronicling America vs HasData: Structured Web Data APIs

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

APIChronicling AmericaNEW—HasData: Structured Web Data APIsNEW—
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Rate limitLoC throttles heavy crawling (see LoC API policy)Unpublished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 HasData: Structured Web Data APIs: common questions

Which is more reliable, Chronicling America or HasData: Structured Web Data APIs?

On our scheduled checks, HasData: Structured Web Data APIs leads on measured uptime — Chronicling America at —% versus HasData: Structured Web Data APIs 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 HasData: Structured Web Data APIs need an API key?

Chronicling America needs no key, while HasData: Structured Web Data APIs requires a free API key. If you want to start calling without signup, reach for Chronicling America first.

Can I call Chronicling America and HasData: Structured Web Data APIs from the browser?

Only HasData: Structured Web Data APIs 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 HasData: Structured Web Data APIs free for commercial use?

Chronicling America allows commercial use on its free tier, and HasData: Structured Web Data APIs 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.