USDs is a hybrid crypto-collateralized and algorithmic stablecoin. It is highly scalable, trustless, and will be completely decentralized after the launch of the governance protocol. SPA will be central to the stability mechanism of USDs, which is fully on-chain. USDs will further invest its collateral in other audited decentralized projects, like Curve, to generate yield and will pass on the yield to holders of USDs. USDs holders (HODLers) would directly earn the yield in their wallets. USDs acts as a low cost-efficient and relatively less risky was to benefit from DeFi. USDs will be launched on Arbitrum, eventually building a system of interoperability to use USDs on other major blockchains.