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NHTSA vs Transport for Paris, France

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

APINHTSANEW—Transport for Paris, FranceNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
Authnonenone
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial useyesunclear
Data licensePublic domain (U.S. Government work)Unverified
Free tierFree, no keyFree — limits not published
Rate limitUnpublishedOpenDataSoft platform defaults (unpublished here)
In directory since2026-07-052026-07-05
operationalpartialdownno data

NHTSA vs Transport for Paris, France: common questions

Which is more reliable, NHTSA or Transport for Paris, France?

On our scheduled checks, Transport for Paris, France leads on measured uptime — NHTSA at —% versus Transport for Paris, France 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 Transport for Paris, France need an API key?

Neither needs a paid key — NHTSA is callable with no signup, and Transport for Paris, France is callable with no signup. Both are quick to prototype with; rate limits still apply.

Can I call NHTSA and Transport for Paris, France from the browser?

Yes — both NHTSA and Transport for Paris, France send CORS headers over HTTPS, so front-end code can fetch either directly with no backend proxy. That makes them easy to swap in a client-side app while you compare responses.

Are NHTSA and Transport for Paris, France free for commercial use?

NHTSA allows commercial use on its free tier, and Transport for Paris, France 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.