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City, Nantes Open Data vs EPA

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

APICity, Nantes Open DataNEW—EPANEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthapiKeynone
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree tier — key may be requiredFree — limits not published
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

City, Nantes Open Data vs EPA: common questions

Which is more reliable, City, Nantes Open Data or EPA?

On our scheduled checks, EPA leads on measured uptime — City, Nantes Open Data at —% versus EPA 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 City, Nantes Open Data and EPA need an API key?

EPA needs no key, while City, Nantes Open Data requires a free API key. If you want to start calling without signup, reach for EPA first.

Can I call City, Nantes Open Data and EPA from the browser?

Yes — both City, Nantes Open Data and EPA 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 City, Nantes Open Data and EPA free for commercial use?

City, Nantes Open Data has unclear commercial terms, and EPA 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.