sUSDe Yield Against the Aave Borrow Rate: Why the USDe Loop No Longer Pays

Anyone borrowing USDe in order to turn it into sUSDe has, since September 9, 2026, been paying more for the loan than the deposit yields. On the four Aave markets that can be measured from outside, the borrow rate for USDe on this September 12 stands between 6.02 and 6.39 percent, while the yield on staked USDe is 5.01 percent. The difference is negative, which means every additional round of the leveraged loop worsens the result compared with simply holding. This piece shows where the two figures stand, how to recalculate them yourself, and at what point the arithmetic tips over. What Aave changed in the USDe interest rate model on September 9 The risk service provider LlamaRisk published a recommendation in Aave's governance forum on September 9, 2026 at 16:39 UTC that raises the base rate for USDe. It reads: "Increase the USDe base rate by 1% to 6% and decrease Slope1 by 1% on Core, Plasma, Monad, Mantle, and Avalanche." The base rate therefore rises from 5.00 to 6.00 percent, while the first slope factor falls by one percentage point. All five Aave V3 instances that list USDe as a reserve are affected. The full recommendation, including the underlying figures, is in Aave's governance forum. The reasoning appears in the same post: the model "prices USDe borrowing in line with Ethena's native staking rate". That is exactly why the loop tips over as soon as the two rates touch. The rates LlamaRisk expected were 6.36 percent on Core, 6.53 on Plasma, 6.38 on Monad, 6.21 on Mantle and 6.87 on Avalanche. By its own account, those five reserves carry around $323.8 million in USDe debt against some $1.18 billion in supplied liquidity. One point belongs with this, because it changes the implications: the change did not go through a vote of token holders but through the so-called risk steward route. The post says so openly: "We will move forward and implement these updates via the Risk Steward process." There was therefore no effective date you could have marked in advance. LlamaRisk discloses in the same text that it is partly funded by the Aave DAO. The USDe yield loop in one sentence, and what it hangs on Yield loop means this: you supply sUSDe as collateral to a lending protocol, borrow USDe against it, stake that USDe back into sUSDe and supply it again. Every round enlarges the deposit without you paying in any new capital of your own. The profit comes solely from the difference between what the deposit yields and what the loan costs. Everything therefore hangs on two figures that move independently of one another. One is the yield on sUSDe, the interest-bearing wrapper around the synthetic dollar USDe.