Data Trends for Investment Professionals


Change to Quandl API Limits

We have made changes to our API limits as of November 21, 2016 at 8AM EST. Users of the Quandl API may be affected by these changes. Specifically, because of unsustainable usage levels, we are now prohibiting simultaneous API calls from a single user.

New API Limits

Registered users are now limited to one API request at a time, with additional requests being throttled until the first request has been returned. These changes will not impact subscribers of premium databases on Quandl.

Open Database Users Premium Database Subscribers
Concurrent calls to the API prohibited Concurrent calls to the API permitted (unchanged)
50,000 calls per day (unchanged) 720,000 calls per day (unchanged)

Why are we making this change?

Quandl is committed to making our open data available to everyone. However, massive concurrent calling by some users is affecting our ability to keep our promise to all users. We need to limit server demand by these few people for the benefit of the larger community.

What should I do?

If you do not explicitly use parallel processing or make multi-threaded calls to our API, you will not need to take any action.

If your code employs concurrent requests to our API, you must update it to make calls serially.

When did this go into effect?

This change went into effect on November 21, 2016, at 8AM EST.

As always, thanks for your support and for using Quandl.  Please feel free to email if you have any questions about this change.


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1 Comment
  • LaVerne Sanders says:


    I’ve been successfully using a C++ API program to download futures data for more than a year.

    Did something change this week between 12/12/2016 and 12/13/2016? I’m not getting any files to download after Monday of this week? I don’t get any messages from my process that the download failed. I just don’t get a new file. I know about the concurrent subject. My process is doing serial downloads.

    Thanks for your help!

    • Raquel Sapnu says:

      Hi LaVerne, Thanks for reaching out. Your question has been forwarded to our data team who will get back to you by email.

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