Data USA vs Federal Register
Same instrument, two spec sheets — measured, not claimed.
Data USA vs Federal Register: common questions
Which is more reliable, Data USA or Federal Register?
On our scheduled checks, Data USA leads on measured uptime — Data USA at 100% versus Federal Register at 98.0% over 90 days. These are our own probe results, not provider claims; the uptime bars above show the day-by-day record for both.
Which is faster, Data USA or Federal Register?
Data USA has the lower median latency in our checks — Data USA responds in 433 ms versus Federal Register at 478 ms (P50). Tail latency (P95) is in the table above; for most workloads the median is the number that shapes how the API feels.
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.