Open Data — entry 021 of 44
Nasdaq Data Link
Nasdaq Data Link (formerly Quandl) aggregates over 250 financial, economic, and alternative datasets from 500+ sources, with roughly 40 available free and the rest sold as a-la-carte premium subscriptions layered on the same keyed API. Its real data host, data.nasdaq.com, blocks most paths behind an Incapsula challenge, but the /api/v3/datatables/ path answers directly with a keyless 403 that asks for an API key, and that response carries no Access-Control-Allow-Origin header, so cors is no.
GreatAPIs Score
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<a href="https://greatapis.com/api/nasdaq-data-link/"><img src="https://greatapis.com/badge/nasdaq-data-link.svg" alt="Scored 67 on greatapis.com"></a>Auth quickstart
- Sign up with the provider to get an API key.
- Send it on every request as a header
Authorization: <key> - The exact header isn't documented — Authorization is a common default; confirm in the provider's docs.
Your key is stored only in this browser (localStorage) and sent directly to the API — never to greatapis.
Developer reference
https://data.nasdaq.com/api/v3Keyless/anonymous Tables API: 20 calls/10 min & 50 calls/day (shared across all anonymous users); keyed non-premium: 300 calls/10 sec, 2,000/10 min, 50,000/day; keyed premium (Tables subscriber): 5,000/10 min & 720,000/day; bulk export 60 uses/hour; real-time/delayed REST API: 100 requests/second across all endpoints