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City, Helsinki vs City, Nantes Open Data

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

APICity, HelsinkiNEW—City, Nantes Open DataNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthnoneapiKey
CORSnoyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree — limits not publishedFree tier — key may be required
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

City, Helsinki vs City, Nantes Open Data: common questions

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

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

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

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

Only City, Nantes Open Data is browser-friendly — it returns CORS headers over HTTPS. City, Helsinki needs a server-side call or proxy, so factor that into which one fits a front-end project.

Are City, Helsinki and City, Nantes Open Data free for commercial use?

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