Visa has partnered with crypto card company Baanx to launch a $USDC stablecoin payment card linked to self-custody wallets in the United States. Cardholders can directly use $USDC from their crypto wallets, transferring stablecoin balances to Baanx in real-time via smart contracts, where they are converted into fiat currency for payments. Additionally, Baanx has collaborated with Mastercard to develop a payment card linked to the MetaMask wallet.