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Data USA vs FastDOL

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

APIData USANEW—FastDOLNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthnoneapiKey
CORSyesno
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree — limits not publishedFree tier — key may be required
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

Data USA vs FastDOL: common questions

Which is more reliable, Data USA or FastDOL?

On our scheduled checks, FastDOL leads on measured uptime — Data USA at —% versus FastDOL 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 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.