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City, Helsinki vs Federal Register

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

APICity, HelsinkiNEW—Federal RegisterNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
Authnonenone
CORSnoyes
HTTPSyesyes
Card requirednono
Commercial useunclearyes
Data licenseUnverifiedUS Government work — public domain
Free tierFree — limits not publishedFree — no key or signup required
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

City, Helsinki vs Federal Register: common questions

Which is more reliable, City, Helsinki or Federal Register?

On our scheduled checks, Federal Register leads on measured uptime — City, Helsinki at —% versus Federal Register 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 Federal Register need an API key?

Neither needs a paid key — City, Helsinki is callable with no signup, and Federal Register is callable with no signup. Both are quick to prototype with; rate limits still apply.

Can I call City, Helsinki and Federal Register from the browser?

Only Federal Register 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 Federal Register free for commercial use?

City, Helsinki has unclear commercial terms, and Federal Register allows commercial use on its free tier. 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.