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Chronicling America vs MarketAux

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

APIChronicling AmericaDEAD0MarketAuxDEAD0
Uptime · 30d
Uptime · 90d0.0%0.0%
Uptime · 30d0.0%0.0%
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 — token required
Rate limitLoC throttles heavy crawling (see LoC API policy)100 requests/day on free plan
In directory since2026-07-052026-07-05
operationalpartialdownno data

Chronicling America vs MarketAux: common questions

Which is more reliable, Chronicling America or MarketAux?

Both are neck-and-neck — Chronicling America and MarketAux each measure 0.0% uptime over 90 days on our probe schedule. Reliability here is verified from our own scheduled checks; use the 30-day bars above to see which has been steadier lately.

Do Chronicling America and MarketAux need an API key?

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

Can I call Chronicling America and MarketAux from the browser?

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

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