USDD is a decentralized, over-collateralized USD-pegged stablecoin that originated as an algorithmic design on TRON in 2022 and was upgraded in 2025 to USDD 2.0, a multi-chain, vault-based stablecoin with a Peg Stability Module and on-chain governance.
Tether Gold (XAUt) is a tokenized gold stablecoin issued by TG Commodities under El Salvador’s Digital Asset Issuance Law, backed 1:1 by London Good Delivery gold stored in Swiss vaults and accounting for a majority of the gold‑backed stablecoin market.
Ondo US Dollar Yield (USDY) is a permissionless, yield-bearing tokenized note backed by short-term U.S. Treasuries, Treasury ETFs, and bank deposits, offering stablecoin-like utility with U.S. dollar‑denominated yield to qualifying non‑US investors.