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.