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AZ511 vs Transport for United States

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

APIAZ511HEALTHY77Transport for United StatesHEALTHY84
Uptime · 30d
Uptime · 90d95.1%100%
Uptime · 30d95.0%100%
P50 · ms22721093
P95 · ms46101963
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

AZ511 vs Transport for United States: common questions

Which is more reliable, AZ511 or Transport for United States?

On our scheduled checks, Transport for United States leads on measured uptime — AZ511 at 95.1% versus Transport for United States at 100% over 90 days. These are our own probe results, not provider claims; the uptime bars above show the day-by-day record for both.

Which is faster, AZ511 or Transport for United States?

Transport for United States has the lower median latency in our checks — AZ511 responds in 2272 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 AZ511 and Transport for United States need an API key?

Transport for United States needs no key, while AZ511 requires a free API key. If you want to start calling without signup, reach for Transport for United States first.

Can I call AZ511 and Transport for United States from the browser?

Only Transport for United States is browser-friendly — it returns CORS headers over HTTPS. AZ511 needs a server-side call or proxy, so factor that into which one fits a front-end project.

Are AZ511 and Transport for United States free for commercial use?

AZ511 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.