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Covid Tracking Project vs NPPES

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

APICovid Tracking ProjectNEW—NPPESNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
Authnonenone
CORSyesno
HTTPSyesyes
Card requirednono
Commercial useyesyes
Data licenseCC BY 4.0U.S. Government (public NPI data)
Free tierFree — no key required (archived dataset)Free — no key required
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

Covid Tracking Project vs NPPES: common questions

Which is more reliable, Covid Tracking Project or NPPES?

On our scheduled checks, NPPES leads on measured uptime — Covid Tracking Project at —% versus NPPES 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 Covid Tracking Project and NPPES need an API key?

Neither needs a paid key — Covid Tracking Project is callable with no signup, and NPPES is callable with no signup. Both are quick to prototype with; rate limits still apply.

Can I call Covid Tracking Project and NPPES from the browser?

Only Covid Tracking Project is browser-friendly — it returns CORS headers over HTTPS. NPPES needs a server-side call or proxy, so factor that into which one fits a front-end project.

Are Covid Tracking Project and NPPES free for commercial use?

Covid Tracking Project allows commercial use on its free tier, and NPPES 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.