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NDBC Buoy Data API vs Sunrise-Sunset

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

APINDBC Buoy Data APIDYING83Sunrise-SunsetHEALTHY97
Uptime · 30d
Uptime · 90d84.3%99.02%
Uptime · 30d73.3%98.3%
P50 · ms575204
P95 · ms10682206
Authnonenone
CORSnoyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedn/a
Free tierFree — limits not publishedUnlimited, attribution requested
Rate limitUnpublishedNo burst traffic
In directory since2026-07-052026-06-22
operationalpartialdownno data

NDBC Buoy Data API vs Sunrise-Sunset: common questions

Which is more reliable, NDBC Buoy Data API or Sunrise-Sunset?

On our scheduled checks, Sunrise-Sunset leads on measured uptime — NDBC Buoy Data API at 84.3% versus Sunrise-Sunset at 99.02% 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, NDBC Buoy Data API or Sunrise-Sunset?

Sunrise-Sunset has the lower median latency in our checks — NDBC Buoy Data API responds in 575 ms versus Sunrise-Sunset at 204 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 NDBC Buoy Data API and Sunrise-Sunset need an API key?

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

Can I call NDBC Buoy Data API and Sunrise-Sunset from the browser?

Only Sunrise-Sunset 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 NDBC Buoy Data API and Sunrise-Sunset free for commercial use?

NDBC Buoy Data API has unclear commercial terms, and Sunrise-Sunset 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.