First Digital USD (FDUSD) is a fiat-backed stablecoin issued by FD121 Limited and fully collateralised with U.S. dollars or equivalent assets. It operates on Ethereum, BNB Chain, and the Sui blockchain, ensuring interoperability and stability. Use cases include remittances, DeFi participation, payments, and volatility hedging. FDUSD can be acquired via direct purchase for institutional clients or on secondary markets for retail users, with redemption options available under regulatory compliance. Its reserves are held securely by First Digital Trust Limited, ensuring transparency and trust.