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Groundhog Day API vs UK Carbon Intensity

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

APIGroundhog Day APIHEALTHY98UK Carbon IntensityHEALTHY70
Uptime · 30d
Uptime · 90d100%100%
Uptime · 30d100%100%
P50 · ms262789
P95 · ms5961948
Authnonenone
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial useunclearyes
Data licenseUnverifiedCC BY 4.0 (per API docs)
Free tierFree — limits not publishedFree — no API key
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

Groundhog Day API vs UK Carbon Intensity: common questions

Which is more reliable, Groundhog Day API or UK Carbon Intensity?

Both are neck-and-neck — Groundhog Day API and UK Carbon Intensity each measure 100% uptime over 90 days on our probe schedule. Reliability here is verified from our own scheduled checks; use the 30-day bars above to see which has been steadier lately.

Which is faster, Groundhog Day API or UK Carbon Intensity?

Groundhog Day API has the lower median latency in our checks — Groundhog Day API responds in 262 ms versus UK Carbon Intensity at 789 ms (P50). Tail latency (P95) is in the table above; for most workloads the median is the number that shapes how the API feels.

Do Groundhog Day API and UK Carbon Intensity need an API key?

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

Can I call Groundhog Day API and UK Carbon Intensity from the browser?

Yes — both Groundhog Day API and UK Carbon Intensity 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 Groundhog Day API and UK Carbon Intensity free for commercial use?

Groundhog Day API has unclear commercial terms, and UK Carbon Intensity 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.