shipapis
StarSubmit an APISubmit API

Glax Weather API vs National Grid ESO

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

APIGlax Weather APIHEALTHY87National Grid ESOHEALTHY92
Uptime · 30d
Uptime · 90d100%100%
Uptime · 30d100%100%
P50 · ms1004609
P95 · ms25341311
Authnonenone
CORSnoyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedNESO Open Data Licence (OGL-based); varies per dataset
Free tierFree — limits not publishedFree — limits not published
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

Glax Weather API vs National Grid ESO: common questions

Which is more reliable, Glax Weather API or National Grid ESO?

Both are neck-and-neck — Glax Weather API and National Grid ESO 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, Glax Weather API or National Grid ESO?

National Grid ESO has the lower median latency in our checks — Glax Weather API responds in 1004 ms versus National Grid ESO at 609 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 Glax Weather API and National Grid ESO need an API key?

Neither needs a paid key — Glax Weather API is callable with no signup, and National Grid ESO is callable with no signup. Both are quick to prototype with; rate limits still apply.

Can I call Glax Weather API and National Grid ESO from the browser?

Only National Grid ESO is browser-friendly — it returns CORS headers over HTTPS. Glax Weather API needs a server-side call or proxy, so factor that into which one fits a front-end project.

Are Glax Weather API and National Grid ESO free for commercial use?

Glax Weather API has unclear commercial terms, and National Grid ESO 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.