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CarsXE vs Road511

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

APICarsXEDEAD0Road511DEAD0
Uptime · 30d
Uptime · 90d0.0%0.0%
Uptime · 30d0.0%0.0%
P50 · ms——
P95 · ms——
AuthapiKeyapiKey
CORSnoyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree tier — API key requiredFree tier — API key required
Rate limitUnpublished70 req/window · 69 remaining · resets 1783522019
In directory since2026-07-052026-07-05
operationalpartialdownno data

CarsXE vs Road511: common questions

Which is more reliable, CarsXE or Road511?

Both are neck-and-neck — CarsXE and Road511 each measure 0.0% 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.

Do CarsXE and Road511 need an API key?

Both ask you to authenticate — CarsXE uses an API key and Road511 uses an API key. Each key is free to obtain; the Auth and Card-required rows above spell out the signup terms.

Can I call CarsXE and Road511 from the browser?

Only Road511 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 Road511 free for commercial use?

CarsXE has unclear commercial terms, and Road511 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.