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Quandl vs ValidEU API

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

APIQuandlHEALTHY88ValidEU APIHEALTHY97
Uptime · 30d
Uptime · 90d100%100%
Uptime · 30d100%100%
P50 · ms823273
P95 · ms3525786
AuthnoneapiKey
CORSnono
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree — limits not publishedFree tier — API key required
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

Quandl vs ValidEU API: common questions

Which is more reliable, Quandl or ValidEU API?

Both are neck-and-neck — Quandl and ValidEU API 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, Quandl or ValidEU API?

ValidEU API has the lower median latency in our checks — Quandl responds in 823 ms versus ValidEU API at 273 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 Quandl and ValidEU API need an API key?

Quandl needs no key, while ValidEU API requires a free API key. If you want to start calling without signup, reach for Quandl first.

Can I call Quandl and ValidEU API from the browser?

Neither sends browser-friendly CORS headers reliably, so call Quandl and ValidEU API from a server or proxy rather than client-side. The CORS and HTTPS rows above show exactly what we detected for each.

Are Quandl and ValidEU API free for commercial use?

Quandl has unclear commercial terms, and ValidEU 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.