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Chronicling America vs Statistics of the World

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

APIChronicling AmericaNEW—Statistics of the WorldNEW—
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 (data sourced from World Bank & IMF)
Free tierFree — public-domain collection dataFree — no key (optional X-API-Key header)
Rate limitLoC throttles heavy crawling (see LoC API policy)1000 req/window · 999 remaining · resets 2026-07-09T11:30:37.514Z
In directory since2026-07-052026-07-05
operationalpartialdownno data

Chronicling America vs Statistics of the World: common questions

Which is more reliable, Chronicling America or Statistics of the World?

On our scheduled checks, Statistics of the World leads on measured uptime — Chronicling America at —% versus Statistics of the World 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 Statistics of the World need an API key?

Neither needs a paid key — Chronicling America is callable with no signup, and Statistics of the World is callable with no signup. Both are quick to prototype with; rate limits still apply.

Can I call Chronicling America and Statistics of the World from the browser?

Only Statistics of the World 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 Statistics of the World free for commercial use?

Chronicling America allows commercial use on its free tier, and Statistics of the World 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.