Spark Savings USDT vault has nearly doubled its deposits to reach $600 million in just two weeks. This non-custodial vault, built on the ERC-4626 standard, allows users to deposit USDT and earn a variable yield paid back in USDT. The reported annual percentage yield stands between 3% and 3.75%, down from earlier peaks exceeding 4%, a common compression when inflows outpace borrowing demand. The integration of Spark Savings into the OKX app in September 2026, which eliminated the need for cross-chain bridging, is partly responsible for this growth. The vault maintained liquidity during market stress in April 2026 involving rsETH.
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