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ProblemsByVin vs Transport for United States

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

APIProblemsByVinNEW—Transport for United StatesNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
Authnonenone
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial useyesunclear
Data licenseCC BY 4.0Data copyright transit agencies / Umo IQ
Free tierFree (weekly-refreshed static JSON datasets)Free — limits not published
Rate limitUnpublished (static JSON files)Unpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

ProblemsByVin vs Transport for United States: common questions

Which is more reliable, ProblemsByVin or Transport for United States?

On our scheduled checks, Transport for United States leads on measured uptime — ProblemsByVin at —% versus Transport for United States 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 ProblemsByVin and Transport for United States need an API key?

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

Can I call ProblemsByVin and Transport for United States from the browser?

Yes — both ProblemsByVin and Transport for United States 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 ProblemsByVin and Transport for United States free for commercial use?

ProblemsByVin allows commercial use on its free tier, and Transport for United States 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.