You can take control of your funds easily:

• Open your Bitso application
• Tap on the Bitso Card’s section from your home’s bottom menu
• Once you’re in the Bitso Card section, locate the “Paying with” label that appears in the upper right corner of the screen
• Tap the the “Paying with” label to display the available funds you can choose from
• Select your favorite one
• You’re all set! 

Your next transaction will be funded to MXN according to the rates and volume at the moment of the transactions; you will pay and merchants will receive the corresponding local currency regardless which asset you have chosen.

Just make sure you have enough funds.

This setup applies for both digital and physical cards. Conversion fees apply when funding with an asset different from MXN.