MetaMask Card is a crypto debit card directly linked to your MetaMask wallet, allowing users to spend cryptocurrencies like USDC, USDT, and WETH at any Mastercard-accepting merchant. Available in regions such as Argentina, Brazil, Canada, Europe, and the UK, it offers instant fiat conversion with minimal fees (e.g., $0.02 Linea gas fee). Key features include 1-3% cashback, Apple/Google Pay support, and a premium Metal Card option for enhanced rewards.