sUSDS (Savings USDS) is a yield-bearing token issued by Spark Protocol, representing a staked version of USDS, a decentralized stablecoin pegged 1:1 to the USD by the Sky Protocol. sUSDS allows users to earn yield from the Sky Savings Rate (SSR), a feature of the Sky Protocol, by depositing USDS into Spark’s ERC-4626 vault. It offers a non-custodial, permissionless way to accrue yield. The Sky Savings Rate is funded by Sky's revenue, which includes fees from crypto collateralized loans, investments into U.S. Treasury Bills and its liquidity provisioning into SparkLend and the Spark Liquidity Layer.