Spark Savings USDT (spUSDT) is a yield-bearing savings vault for USDT.Spark Savings USDT (spUSDT) is a yield-bearing savings vault for USDT. Users deposit USDT and receive spUSDT tokens that automatically accrue yield over time through an increasing redemption rate. It is built on the ERC-4626 tokenized vault standard, making spUSDT transferable and composable with other DeFi protocols it continues earning yield wherever it's held. spUSDT is part of Spark's V2 Savings product suite, fully backed by USDS (the Sky ecosystem stablecoin). Yield is generated via the Spark Liquidity Layer, which deploys capital across vetted DeFi venues. Spark's position as the Prime Agent of Sky gives it programmatic access to institutional-scale liquidity, enabling competitive and stable savings rates for depositors.