The global payment giant Mastercard is expanding its support for non-custodial wallets in a new collaboration that allows users to spend cryptocurrencies while 'being their own bank'. After testing a cryptocurrency debit card with the major self-custody wallet MetaMask in August, Mastercard's new partnership with the European crypto payment infrastructure provider Mercuryo will further connect traditional finance and cryptocurrencies. In the collaboration, Mastercard has enabled a new euro-denominated debit card that allows users to spend cryptocurrencies like bitcoin BTC stored in self-custody wallets at over 100 million merchants in the Mastercard network.