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Groundhog Day API vs NDBC Buoy Data API

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

APIGroundhog Day APIHEALTHY98NDBC Buoy Data APIDYING83
Uptime · 30d
Uptime · 90d100%84.3%
Uptime · 30d100%73.3%
P50 · ms262575
P95 · ms5961068
Authnonenone
CORSyesno
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree — limits not publishedFree — limits not published
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

Groundhog Day API vs NDBC Buoy Data API: common questions

Which is more reliable, Groundhog Day API or NDBC Buoy Data API?

On our scheduled checks, Groundhog Day API leads on measured uptime — Groundhog Day API at 100% versus NDBC Buoy Data API at 84.3% over 90 days. These are our own probe results, not provider claims; the uptime bars above show the day-by-day record for both.

Which is faster, Groundhog Day API or NDBC Buoy Data API?

Groundhog Day API has the lower median latency in our checks — Groundhog Day API responds in 262 ms versus NDBC Buoy Data API at 575 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 NDBC Buoy Data API need an API key?

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

Can I call Groundhog Day API and NDBC Buoy Data API from the browser?

Only Groundhog Day API is browser-friendly — it returns CORS headers over HTTPS. NDBC Buoy Data API needs a server-side call or proxy, so factor that into which one fits a front-end project.

Are Groundhog Day API and NDBC Buoy Data API free for commercial use?

Groundhog Day API has unclear commercial terms, and NDBC Buoy Data API 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.