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NHTSA vs Smartcar

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

APINHTSANEW—SmartcarNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthnoneapiKey
CORSyesno
HTTPSyesyes
Card requirednono
Commercial useyesunclear
Data licensePublic domain (U.S. Government work)Unverified
Free tierFree, no keyFree tier — API key required
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

NHTSA vs Smartcar: common questions

Which is more reliable, NHTSA or Smartcar?

On our scheduled checks, Smartcar leads on measured uptime — NHTSA at —% versus Smartcar 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 NHTSA and Smartcar need an API key?

NHTSA needs no key, while Smartcar requires a free API key. If you want to start calling without signup, reach for NHTSA first.

Can I call NHTSA and Smartcar from the browser?

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

Are NHTSA and Smartcar free for commercial use?

NHTSA allows commercial use on its free tier, and Smartcar 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.