#MastercardStablecoinCards Mastercard Stablecoin Cards are payment cards that allow users to spend stablecoins—such as USDC or USDT—at over 150 million merchant locations worldwide that accept Mastercard. This card was developed through a partnership between Mastercard and MoonPay, and is supported by the stablecoin infrastructure from Iron, a company acquired by MoonPay in March 2024.