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Federal Register vs USAspending.gov

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

APIFederal RegisterNEW—USAspending.govNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
Authnonenone
CORSyesno
HTTPSyesyes
Card requirednono
Commercial useyesyes
Data licenseUS Government work — public domainU.S. Government Work (public domain)
Free tierFree — no key or signup requiredFree — no key required
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

Federal Register vs USAspending.gov: common questions

Which is more reliable, Federal Register or USAspending.gov?

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

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

Can I call Federal Register and USAspending.gov from the browser?

Only Federal Register is browser-friendly — it returns CORS headers over HTTPS. USAspending.gov needs a server-side call or proxy, so factor that into which one fits a front-end project.

Are Federal Register and USAspending.gov free for commercial use?

Federal Register allows commercial use on its free tier, and USAspending.gov 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.