There is a monthly subscription fee listed on your RentTrack main page under Start Reporting Your Rent. You can cancel your subscription at any time. Your subscription is charged with the card on file each month on the day you started your subscription.
Keep in mind, building credit is all about demonstrating a history of responsibility. So it's ideal to stay subscribed with RentTrack for the duration of your lease to get the maximum credit benefit with all three credit bureaus. This is a small price to pay to help build your financial future!