[Risk Stewards] August 2026 – Stablecoin Interest Rate Adjustments

title: [Risk Stewards] August 2026 - Stablecoin Interest Rate Adjustments author: @TokenLogic created: 2026-08-24 Overview TokenLogic proposes updating Aave stablecoin interest-rate curves. The proposal raises Slope1 where recent utilization or persistent supply and demand conditions support a higher target rate, moderates Slope2 on X Layer to reduce borrow-rate volatility during periods of growing demand, aligns the borrowing cost of Ethena yield-bearing stablecoins with their native staking rates, and adopts a temporary UOptimal change to house the demand transfer from Ethena interest rate changes. The changes seek to preserve competitive borrowing conditions while ensuring that stablecoin debt is priced consistently with its use across Aave. General slope increase Stablecoin rates need to reflect both sides of each market. Borrow demand can support a higher rate when users continue to take on debt at the existing target, while declining or flat supply can justify a higher return when demand remains stable or grows. We applied these principles over a persistent observation period so that a temporary movement on either side of a reserve does not determine the recommendation. The following 22 reserves are proposed for a 50 bps increase in Slope1. GHO remains under separate rate management. Frozen reserves remain unchanged. At current borrow balances and utilization, these changes add an estimated $2.55 million of annual DAO revenue if demand remains unchanged. This is a static estimate, and the staged execution outlined later in the analysis allows the DAO to evaluate the response before every subsequent increase. Unlike the other markets, we recommend limiting the change on Base USDC to 25 bps. Its Slope1 already stands at 4.50% and would move to 4.75%, leaving the market at a target rate above the other Aave deployments. The market remains meaningfully lower cost than alternatives on the same chain and can command a premium over comparable chains. Two of the reserves in scope, USDC on Ink and USDT on BNB Chain, operate meaningfully below their optimal utilization. On BNB Chain, debt has continued to grow, while on Ink, borrowed amounts have held steady as deposits have declined. In both markets, demand remains solid, and the constraint sits on the supply side, so a higher supplier return is the appropriate lever to attract the deposits this demand supports. Economic context Ethereum, Plasma, and Base are three of Aave’s most significant deployments; as such, they require additional consideration when changes are applied. For this reason, we assess the broader rate environment on each chain to ensure that Aave remains competitive for sizeable borrows and leveraged strategies. The comparison uses Aave borrowing costs, borrowing incentives where applicable, the largest suitable lending-market comparator, and the staking rates available from the yield-bearing stablecoins listed on each chain. Every series will be presented as APR. Aave Borrow Rate vs On-Chain Comparison - Ethereum Aave Borrow Rate vs On-Chain Comparison - Plasma Aave Borrow Rate vs On-Chain Comparison - Base On Ethereum, Aave is currently 25 to 60 bps cheaper than alternative venues for any volatile borrow demand, and comparable to Spark Lending. Following the change, the Aave market will command a considerable premium over its two main competitors. This could prove counterproductive by shifting demand; the borrow rate change will be implemented gradually and closely monitored. The spread between the relevant yield-bearing stablecoin rate and the Aave borrowing cost leaves roughly 5% of room for maximum leverage. However, these leveraged-strategy yields are expected to rise above 5% as the underlying yield environment improves, further strengthening Aave’s market position and pushing the leveraged yield to 7-8%. Plasma has no lending market comparator of sufficient size at this time, so its chart compares Aave borrowing costs against the available sUSDe and syrupUSDT rates. That spread leaves roughly 6% at maximum leverage after accounting for the live USDT0 borrowing incentive. On Base, Aave remains roughly 25 basis points cheaper than the next comparable venue, while the yield-bearing spread leaves roughly 8% at maximum leverage. Expected market response The projection below estimates how the Ethereum Core stablecoin reserves absorb the combined effect of the staged Slope1 increases and the USDe realignment. It rests on a set of assumptions that are listed as follows: On the supply side, USDC deposits are assumed to grow by $14M per week, in line with the market’s observed behavior over the past month. USDT deposits are assumed to grow by $18M per week once reserves reach optimal utilization, mirroring the growth observed for USDC, provided sufficient demand reaches the market, and the broader environment becomes supportive of USDT borrowing. Yield-bearing collateral rates are held at current levels, 4.2% for syrupUSDT and 4.8% for syrupUSDC, while sUSDe is carried at the 5.3% rate derived later in this analysis. Borrowers are assumed to migrate between lending venues only when the rate advantage exceeds a tolerance, defined as rate sensitivity, quantified from historical behavior, as observed migration patterns show that borrowers tend to stay put when the difference is minimal and tend to assign premiums and discounts to certain venues. The borrow demand released by the USDe borrow rate change is assumed to be redistributed between other Aave markets where liquidity is available, filling each reserve up to its optimal utilization. Within Aave, the two reserves are observed to trade at a sustained spread, reflecting increased demand for USDT borrows and the USDT weak market peg. Deposits, in turn, are assumed to migrate from Spark Savings whenever the Aave supply rate exceeds their hurdle rate by a sufficient margin. Suppliers tend to react more slowly than borrowers, but Spark Savings remains the most likely venue from which additional supply is attracted in an isolated market environment, and the sensitivity is kept consistent with the rest of the framework. Ahead of this projection, we conducted a statistical analysis on historical rate and parameter changes to estimate how the supply side of these markets reacts to them. The exercise did not yield a clear correlation, as deposit reactions could not be separated from ordinary market variability over the time horizon this rate-change program operates on. As such, this analysis covers the supply side only in a limited fashion, through the relationship between Aave supply rates and the Spark Savings products. The numbers presented below should be read in that context: the supply side is likely to react more positively than simulated, but the quantification of its difference is unmodeled. Under these assumptions, the expected reaction at each step of the sequence is the following. Ethereum Core USDT Ethereum Core USDC Most of the adjustment is expected to concentrate in the first step. The borrow demand arriving from the USDe rate change is met by an estimated $366M of deposits migrating from Spark Savings to the USDT market, whose hurdle rate is reached at the UOptimal level, and the reserve absorbs the inflow without a lasting rate spike. At the same step, roughly $10.1M of syrupUSDT-collateralized loops are expected to close, as the higher rate leaves them below the return a levered position requires. Across the remainder of the sequence, an estimated $44.8M of volatile-collateral USDT debt is expected to migrate to Spark before capacity there is filled. USDC crosses no external threshold at any step; its movement comes from within Aave, as borrowers switching over from USDT fill the headroom its supply growth creates over time and hold the reserve near its optimal utilization through most of the sequence. The spread between the two reserves widens with each step until it reaches the USDC rate premium as stated in the initial assumptions. We expect the market to land in a significantly stronger position than it started. The combined book ends roughly $408M larger than today, split between roughly $356M on USDT and $52M on USDC once the switching between the two reserves is accounted for, with the USDe demand absorbed and repriced at market rates. Realized borrow rates are expected to settle slightly below the published targets, at approximately 4.27% on USDT and 4.47% on USDC, because the supply the program attracts eases utilization as it arrives. Total outflows across the sequence, near $55M between migration and closures, remain small next to the retained and newly attracted demand. The projection is an estimate, and the staged execution is intended so that each step can be analyzed for negative reaction before the next one is taken. Slope2 adjustment on X Layer Leveraged positions depend on borrowing costs remaining manageable as demand grows quickly. The current configuration on X Layer can cause high volatility in borrowing rates during these periods, forcing positions to reduce debt abruptly even when the underlying strategy remains viable. LlamaRisk covered the effect in its recent analysis of the Monad stablecoin reserves, recommending an increase in optimal utilization from 90% to 92% and a reduction of Slope2 from 40% to 20%. We support these values and recommend extending the Slope2 reduction to X Layer, which runs the same configuration. The changes lower the maximum borrow rates on these reserves from 44.00–45.00% to 24.00–25.00%. While the parameters remain above the configurations used on the more established deployments, we recommend maintaining a buffer that reflects the novelty and size of these instances. Yield-bearing alignment We also recommend aligning the borrowing rates of USDe with their staking rates so that users cannot borrow these assets at rates lower than their native protocols allow. A lower borrowing floor can otherwise support positions that collect rewards while paying an inadequately priced debt cost on Aave. The proposal sets the USDe base rate at 5.25%, and the standard Slope1 at 0.25%. The higher borrowing floor is expected to close a material share of current USDe debt. Most of this debt sits in positions that recycle borrowed USDe back into sUSDe, a structure that carries overlapping incentive costs for the wider Ethena ecosystem. As these positions unwind, we expect the Ethena Staking Rate to rise by roughly 50 bps, leaving both the Ethena product and the Aave positions built on it healthier. A higher staking rate also improves how other Aave markets respond, driving growth expected to offset the closed positions. USDe borrower response and expected migration Ethereum Core currently has $459.8M of USDe debt. Volatile-collateral borrowers account for 50.5% of the instance, while borrowers using yield-bearing stable collateral account for the remaining portion. Other positions contribute minimally. We separated wallets in the market using a 90-day activity cut to distinguish dormant debt from active positions. Roughly $1.25M of the volatile-collateral segment lies in the first group. Plasma has a different composition, with 99.9% of its $154.2M USDe debt sitting in the yield-bearing stable segment. Monad and Mantle add $36.0M and $2.3M of USDe debt and hold no yield-bearing stable collateral at all, with Monad at 82.1% plain-stable collateral and Mantle entirely volatile. The proposed rate will affect the two economically distinct uses of USDe differently. Current USDe debt by borrower sensitivity segment across Ethereum Core, Plasma, Monad, and Mantle. The current curve allows loop-funded deposits to earn protocol yield while the associated borrowing remains cheap, creating overlapping incentive costs without adding external demand for USDe. The proposed 5.25% APR base rate links the borrow cost to Ethena’s current staking rate after accounting for Aave’s reserve factor. Loop-funded deposits dilute the yield available to other Ethena holders. Based on our estimate, this change in the interest rate curve should improve the annual yield accrued by the Ethena system by roughly 50 bps. If loop-funded supply unwinds, we expect the Ethena staking rate to reach roughly 5.3% APY. However, the uplift depends on the extent of the unwind and the resulting contraction in sUSDe supply. Expected change in the borrower book Following this change, active loop positions would be the first to respond, migrating shortly after the rate increase. Given the increase in Ethena Staking rate, transferring the open positions to stablecoin debt will remain highly profitable. Such migration will increase utilization and demand in the destination markets. These borrowers against volatile collateral are likely to be the last to move and the least likely to leave. And when they do, they are also the most likely to refinance into other stablecoin debt, which would also add utilization and demand to those destinations. In the nearer term, the remaining USDe book would therefore be expected to include the dormant wallets and a material share of this sticky volatile-collateral debt. Over a longer horizon we expect this debt to migrate as well, though the pace is uncertain and the outcome not assured. The two migration paths have distinct economics. As such, the proposed USDe curve could remove the current leveraged loops even if volatile collateralized borrows adjust more slowly or remain. Stablecoin UOptimal Temporary Increase As the USDe realignment is expected to move a meaningful portion of its debt toward cheaper stablecoin markets, the immediate constraint sits in the liquidity available in the USDC and USDT reserves on Ethereum Core and Plasma. To accommodate the migration, we recommend a temporary 2% increase in the optimal utilization of these reserves. At current deposit levels, the change frees roughly $116M of additional borrowing capacity, allowing the market to absorb demand from USDe before the supply side has time to react to the supply rate increase. The purpose of the adjustment is to avoid spikes in the borrow rate of the market stablecoins while the books absorb the arriving demand. It is intended only as a temporary measure: once the market attracts sufficient liquidity following the Slope1 increase, the optimal utilization is expected to be walked back to its current levels together with the rest of the parameter changes. Slope1 staged implementation We recommend implementing the Slope1 increases in 10 bps steps through the Risk Stewards, with all in-scope reserves moving together. This process reflects reserve dynamics. Persistent utilization near the kink establishes that borrowers value the market liquidity above its current price, but does not establish the ceiling of this rate. A 10 bps overshoot is visible in the data and simple to unwind, while a single full-sized move would reveal a misjudgment only after the demand it priced out had left. Borrowed amount is the primary indicator between steps because debt directly measures whether demand agrees to the new price. While debt holds or grows, the premise behind the increase remains intact, and the slope1 increases progress. A contraction, however, one that exceeds the reserve’s normal variability and is not observed in comparable markets we have left untouched, indicates the ceiling has been found: past that point, further increases would cost more in departing debt than they earn in borrowing rate. TokenLogic will stop further increases on the reserve if the above is observed. Deposit growth is the process objective. Our primary objective with the rate increase is to attract additional supply to clear the demand bottleneck. However, it takes time for depositors to establish that the new, higher supply rate is stable and worth migrating to. This behaviour is visible historically, as deposit growth has lagged the rate change. We therefore expect supply to react more slowly than debt. When, following an increase, no deposit growth nor debt shrinkage has happened, we will pause the schedule and allow time for that response to materialize before increasing further. Utilization acts as the balance between the two sides of the market. If deposits do arrive faster than borrowing grows into them, the utilization is pushed below the range the reserve normally occupies. Each reserve therefore carries a floor drawn from its own utilization history. A reserve below its floor has, for the moment, more capacity than demand, and further rate increases would serve no purpose until borrowing absorbs the new supply. The schedule will then suspend for that reserve and resume once utilization recovers within the target. USDC on Ink and USDT on BNB Chain instead require a different consideration. As both were selected below their optimal utilization, with solid demand constrained by shallow supply, for these two reserves, deposit growth is itself the measure of success, and our target is to primarily maximize that. While we target each 10bps change to be executed weekly, if we observe the market reacting positively and responding faster than expected, we can increase the speed at which these increases are executed, up to the Risk Stewards’ limit of 72 hours. We expect individual weeks to show little change during the process. A 10 bps step sits inside the daily variability of these markets. The cumulative pattern should be used to determine progress. Every week, TokenLogic will assess internally each reserve against its pre-existing trends and comparable unchanged markets, so that a market-wide movement is not attributed to the program. When the sequence reaches the full 50 bps Slope1 increase, or 25 bps for the Base USDC market, the market situation will be reassessed to determine whether another proposal is necessary. Execution The base-rate changes for USDe execution will be conducted through Risk Stewards in order to expedite the start of the rate adjustment. While these moves exceed what a single Risk Steward action can carry, and moving from zero to its aligned level would require five to six increments with a cooldown between each, the gradual implementation allows us to observe the first effects of the change in the days following the proposal. The complete execution is expected to stretch over the following two weeks. For the Slope2 and optimal utilization changes, we recommend executing them after publication of this proposal through the Risk Stewards process, in sync with the execution of the first change to the USDe base rate. Specifications The following specifications cover the first parameter changes recommended in this analysis. Specifications for the next changes will be posted as a response to this post. Slope1 USDe Alignment Slope2 Reduction Stablecoin UOptimal Adjustment Forward look Further analysis will cover the stablecoin reserves not addressed in this proposal. The remaining work is concentrated in smaller markets and in reserves where current conditions may support rate reductions. Those changes require separate treatment because liquidity, lifecycle status, and the response to prior rate changes differ materially across the remaining books. Disclaimer TokenLogic is an active service provider to the Aave DAO, the beneficiary of stream 100086 and the KPI as outlined in this publication. The scope of this engagement is available via this forum proposal. TokenLogic supports and maintains an independent delegate voting platform within the Aave community. TokenLogic and associated entities have no undisclosed material conflicts of interest at the time of submission. Next Steps Expand the specification of LlamaRisk’s proposal to the full Slope 2 and UOptimal set presented above. Gradually implement the Slope 1 and Base changes via Risk Stewards, followed by close monitoring. 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