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UK Carbon Intensity vs US Weather

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

APIUK Carbon IntensityNEW—US WeatherNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
Authnonenone
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial useyesyes
Data licenseCC BY 4.0 (per API docs)U.S. Government work / public domain
Free tierFree — no API keyFree (US Government public data)
Rate limitUnpublishedUnpublished (asks for a User-Agent identifying your app)
In directory since2026-07-052026-07-05
operationalpartialdownno data

UK Carbon Intensity vs US Weather: common questions

Which is more reliable, UK Carbon Intensity or US Weather?

On our scheduled checks, US Weather leads on measured uptime — UK Carbon Intensity at —% versus US Weather 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 UK Carbon Intensity and US Weather need an API key?

Neither needs a paid key — UK Carbon Intensity is callable with no signup, and US Weather is callable with no signup. Both are quick to prototype with; rate limits still apply.

Can I call UK Carbon Intensity and US Weather from the browser?

Yes — both UK Carbon Intensity and US Weather 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 UK Carbon Intensity and US Weather free for commercial use?

UK Carbon Intensity allows commercial use on its free tier, and US Weather 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.