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Chronicling America vs RestoSignals

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

APIChronicling AmericaDEAD0RestoSignalsREACHABLE100
Uptime · 30d
Uptime · 90d0.0%100%
Uptime · 30d0.0%100%
P50 · ms—748
P95 · ms—748
AuthnoneapiKey
CORSnono
HTTPSyesyes
Card requirednono
Commercial useyesunclear
Data licensePublic domain / no known copyright (Library of Congress)
Free tierFree — public-domain collection data
Rate limitLoC throttles heavy crawling (see LoC API policy)
In directory since2026-07-052026-10-19
operationalpartialdownno data

Chronicling America vs RestoSignals: common questions

Which is more reliable, Chronicling America or RestoSignals?

On our scheduled checks, RestoSignals leads on measured uptime — Chronicling America at 0.0% versus RestoSignals at 100% 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 RestoSignals need an API key?

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

Can I call Chronicling America and RestoSignals from the browser?

Neither sends browser-friendly CORS headers reliably, so call Chronicling America and RestoSignals 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 RestoSignals free for commercial use?

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