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ProblemsByVin vs Transport for United States

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

APIProblemsByVinHEALTHY88Transport for United StatesHEALTHY84
Uptime · 30d
Uptime · 90d100%100%
Uptime · 30d100%100%
P50 · ms7381093
P95 · ms25121963
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Rate limitUnpublished (static JSON files)Unpublished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?

Both are neck-and-neck — ProblemsByVin and Transport for United States each measure 100% uptime over 90 days on our probe schedule. Reliability here is verified from our own scheduled checks; use the 30-day bars above to see which has been steadier lately.

Which is faster, ProblemsByVin or Transport for United States?

ProblemsByVin has the lower median latency in our checks — ProblemsByVin responds in 738 ms versus Transport for United States at 1093 ms (P50). Tail latency (P95) is in the table above; for most workloads the median is the number that shapes how the API feels.

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.