To cancel your subscription, kindly login to your CoinGecko account at https://www.coingecko.com/account/subscriptions
Then navigate to Subscriptions >> Switch Plan >> Cancel My Plan
In order to remove your credit card details on your subscription, kindly follow these steps:
1. Proceed to your Subscription page via this link: https://www.coingecko.com/account/subscriptions?locale=en
2. Click on "Edit Payment Method"
3. At "Payment Method" > click on the 3 dots and click Delete to remove your payment method. Kindly ensure that you have cancelled your premium subscription prior to performing this step.
It would be great if you could provide some feedback to your current decision.