Yes. You can cancel at any time. You will have access to your account until the end of the current billing period.
monetr does not require a payment method to try it out, however we do limit you to a single Plaid connection during the trial to try to prevent spam.
If you have not subscribed yet then you don't need to do anything! Your account will become inactive automatically at the end of your trial. If you have already subscribed then you can cancel your subscription at any time!