USDD, or Decentralised USD, is a stablecoin launched by the TRON DAO Reserve in May 2022. Built on the TRON blockchain, USDD aims to blend the attributes of a stable currency with the decentralisation features of popular cryptocurrencies. It is algorithmically pegged to the US Dollar, meaning its value is maintained at approximately $1 through automated, smart contract mechanisms. USDD belongs to the category of decentralised stablecoins, intending to offer a seamless and resilient alternative to centralised stablecoins by utilising distinctive incentive mechanisms and risk management frameworks. With a focus on transparency, USDD also supports cross-chain interoperability, being issued on blockchain networks like Ethereum and BNB Chain, which enhances its accessibility and utility across diverse DeFi ecosystems.