Can I cancel my premium data subscriptions at any time? How do I cancel my subscription?

Yes. You can cancel your premium subscriptions at any time by logging in to your account at www.quandl.com and going to Account Settings > Subscriptions.  On the Subscriptions page, you'll be able to cancel any of your subscriptions by clicking "Unsubscribe".

When you cancel a subscription for a data feed, you will continue to have access to that data feed until the end of your subscription period for that feed. After that your subscription simply won't renew.