The Nash card primarily uses the EUR balance in your Nash IBAN account for payments. Additionally, you can enable payments using wBTC on the Polygon chain.

To activate this feature, open the menu shown in the screenshot below and follow the instructions.

Please note that wBTC (Polygon) must be in your Trading Wallet. You can transfer funds from your Personal Wallet to your Trading Wallet using the Nash mobile app or web app at https://app.nash.io/funds/portfolio.

Enable wBTC payments: 

Inside the Cards page, tap the Pay with Bitcoin section and follow the steps in the app.