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ONS vs LocalGov.jp

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

APIONSUNMONITORED—LocalGov.jpNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
Authnonenone
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial useunclearyes
Data licenseUnverifiedCC BY 4.0 (attribution: "via LocalGov.jp")
Free tierFree — limits not publishedFree — all endpoints currently free (per llms.txt)
Rate limitUnpublished30 req/window · 29 remaining
In directory since2026-07-052026-07-05
operationalpartialdownno data

ONS vs LocalGov.jp: common questions

Which is more reliable, ONS or LocalGov.jp?

Only LocalGov.jp is on our probe schedule so far (—% uptime over 90 days). The other is catalogued but not yet live-checked, so we can't compare measured reliability head-to-head — check the uncovered API's own status page for now.

Do ONS and LocalGov.jp need an API key?

Neither needs a paid key — ONS is callable with no signup, and LocalGov.jp is callable with no signup. Both are quick to prototype with; rate limits still apply.

Can I call ONS and LocalGov.jp from the browser?

Yes — both ONS and LocalGov.jp 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 ONS and LocalGov.jp free for commercial use?

ONS has unclear commercial terms, and LocalGov.jp 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.