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?
On our scheduled checks, Data USA leads on measured uptime — Data USA at 100% versus FastDOL at 76.1% 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 FastDOL?
Data USA has the lower median latency in our checks — Data USA responds in 58 ms versus FastDOL at 443 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.