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CarsXE vs Transport for United States

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

APICarsXENEW—Transport for United StatesNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthapiKeynone
CORSnoyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedData copyright transit agencies / Umo IQ
Free tierFree tier — API key requiredFree — limits not published
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

CarsXE vs Transport for United States: common questions

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

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

Transport for United States needs no key, while CarsXE requires a free API key. If you want to start calling without signup, reach for Transport for United States first.

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

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

Are CarsXE and Transport for United States free for commercial use?

CarsXE has unclear commercial terms, 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.