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Chronicling America vs Web of Science API Expanded

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

APIChronicling AmericaNEW—Web of Science API ExpandedNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthnoneapiKey
CORSnono
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Rate limitLoC throttles heavy crawling (see LoC API policy)Unpublished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 Web of Science API Expanded: common questions

Which is more reliable, Chronicling America or Web of Science API Expanded?

On our scheduled checks, Web of Science API Expanded leads on measured uptime — Chronicling America at —% versus Web of Science API Expanded 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 Web of Science API Expanded need an API key?

Chronicling America needs no key, while Web of Science API Expanded requires a free API key. If you want to start calling without signup, reach for Chronicling America first.

Can I call Chronicling America and Web of Science API Expanded from the browser?

Neither sends browser-friendly CORS headers reliably, so call Chronicling America and Web of Science API Expanded 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 Web of Science API Expanded free for commercial use?

Chronicling America allows commercial use on its free tier, and Web of Science API Expanded 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.