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Data USA vs Federal Register

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

APIData USANEW—Federal RegisterNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
Authnonenone
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial useunclearyes
Data licenseUnverifiedUS Government work — public domain
Free tierFree — limits not publishedFree — no key or signup required
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

Data USA vs Federal Register: common questions

Which is more reliable, Data USA or Federal Register?

On our scheduled checks, Federal Register leads on measured uptime — Data USA at —% versus Federal Register 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 Data USA and Federal Register need an API key?

Neither needs a paid key — Data USA is callable with no signup, and Federal Register is callable with no signup. Both are quick to prototype with; rate limits still apply.

Can I call Data USA and Federal Register from the browser?

Yes — both Data USA and Federal Register send CORS headers over HTTPS, so front-end code can fetch either directly with no backend proxy. That makes them easy to swap in a client-side app while you compare responses.

Are Data USA and Federal Register free for commercial use?

Data USA has unclear commercial terms, and Federal Register allows commercial use on its free tier. 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.