You can’t add a credit card with a 0% rate to Cardeo Credit, because you can only transfer borrowing from credit cards with a higher rate than Cardeo Credit.

However, you can still apply for Cardeo Credit, or add your 0% card to an existing Cardeo Credit account when it is about to expire. As soon as your interest rate changes from 0%, update the rate in the Cardeo app. As long as the new rate is at least 1% higher than your Cardeo Credit rate, you will then be able to transfer the borrowing from that card.