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City Bikes vs NPPES

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

APICity BikesNEW—NPPESNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
Authnonenone
CORSyesno
HTTPSyesyes
Card requirednono
Commercial useunclearyes
Data licenseUnverifiedU.S. Government (public NPI data)
Free tierFree — no key requiredFree — no key required
Rate limit300 req/window · 296 remaining · resets 837Unpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

City Bikes vs NPPES: common questions

Which is more reliable, City Bikes or NPPES?

On our scheduled checks, NPPES leads on measured uptime — City Bikes 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 City Bikes and NPPES need an API key?

Neither needs a paid key — City Bikes 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 City Bikes and NPPES from the browser?

Only City Bikes 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 City Bikes and NPPES free for commercial use?

City Bikes has unclear commercial terms, 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.