Stablecoin yields in Aave's Ethereum market have decreased from an average of 5% in late summer to just over 3%, according to Blockworks Research analyst Jack. Specifically, USDC, DAI, and USDT yields are slightly above 3%, while USDe, RLUSD, and USDS yields have dropped to as low as 1.5%. Although users willing to explore cross-chain options may find slightly higher returns, overall demand for stablecoins in DeFi is cooling.