Are anonymous calls allowed?
Yes. However, anonymous calls are limited to 20 calls per 10 minutes, 50 calls per day and 1 call at a time. If these limits are not enough for your requirements, please log in to your Quandl account and append your API key to your call.
Premium users have the following limits: 5,000 calls per 10 minutes, 720,000 calls per day and an unlimited number of concurrent calls.
Logged in free users have the following limits: 2,000 calls per 10 minutes, 50,000 calls per day and one call at a time. You may also add up to one call in the queue.
Your API key can be found in your account settings.
If you don't have a Quandl account, you can create one here for free.