Data USA vs FastDOL
Same instrument, two spec sheets — measured, not claimed.
Data USA vs FastDOL: common questions
Which is more reliable, Data USA or FastDOL?
Both are neck-and-neck — Data USA and FastDOL each measure 100% 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.
Which is faster, Data USA or FastDOL?
Data USA has the lower median latency in our checks — Data USA responds in 433 ms versus FastDOL at 680 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 FastDOL need an API key?
Data USA needs no key, while FastDOL requires a free API key. If you want to start calling without signup, reach for Data USA first.
Can I call Data USA and FastDOL from the browser?
Only Data USA is browser-friendly — it returns CORS headers over HTTPS. FastDOL needs a server-side call or proxy, so factor that into which one fits a front-end project.
Are Data USA and FastDOL free for commercial use?
Data USA has unclear commercial terms, and FastDOL 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.