Summary
LlamaRisk views the introduction of Segregated Bluechip E-Modes as a continuation of the simultaneously introduced Isolated Bluechip E-Modes proposal, offering a distinct value proposition for risk-averse borrowers seeking to eliminate rehypothecation risks. We support the expansion of Aave’s product suite to capture this growing market segment. However, the introduction of regular pooled lending, isolated bluechip E-Modes, and segregated wrapper-based E-Modes introduces a complex structure for the same underlying assets. This fragmentation creates significant potential for user confusion regarding the nuances of yield forfeiture versus risk isolation. Consequently, the success of this implementation relies heavily on substantial UI abstractions to clearly delineate the trade-offs between these modes.
Parameter Parity and Incentive Alignment
A primary concern regarding the proposed configuration is the potential for incentive misalignment caused by superior collateral efficiency parameters in the segregated markets compared to the proposed isolated or existing pooled markets.
| Asset | Parameter | Current Regular | Proposed Isolated | Proposed Segregated |
|---|---|---|---|---|
| WETH | Max LTV | 80.50% | 83.00% | 85.50% |
| Liquidation Threshold | 83.00% | 85.00% | 87.50% | |
| Liquidation Bonus | 5.00% | 4.00% | 4.00% | |
| WBTC | Max LTV | 73.00% | 81.00% | 82.50% |
| Liquidation Threshold | 78.00% | 83.00% | 84.50% | |
| Liquidation Bonus | 5.00% | 4.00% | 4.00% | |
| cbBTC | Max LTV | 73.00% | 81.00% | 82.50% |
| Liquidation Threshold | 78.00% | 83.00% | 84.50% | |
| Liquidation Bonus | 7.50% | 4.00% | 4.00% |
Note: Bluechip collateral efficiency for Ethereum Core
If the Segregated E-Modes offer higher LTV and LT than their counterparts, users may be incentivized to migrate liquidity into segregated wrappers purely to maximize leverage and collateral efficiency, rather than due to a genuine preference for non-rehypothecated collateral. This behavior would inadvertently drain liquidity from the pooled markets, skewing the data on actual demand for segregated products.
Other important factors are the leverage and profitability estimates: moving from the Isolated LT to the proposed Segregated LT increases the maximum attainable leverage by approximately 25% (x5.6 → x7). However, the ROI does not shift accordingly. The supply yield offered to WETH collateral (~1.6%) offsets part of the stablecoin borrowing costs (currently trending around 4%), lowering the profitability threshold for pooled leverage looping positions. If we assume these conditions, WETH leverage looping positions in the Isolated E-Mode will become profitable if ETH appreciates by 1.8% APY, while for the positions in the Segregated E-Mode ETH, appreciation would need to reach 3.5% APY to reach profitability.
Furthermore, it is notable that WBTC and cbBTC utilization remains comparatively low in comparison with WETH (up to 10% for BTC reserves, up to 90% for ETH reserves). Therefore, the rehypothecation risk reduction achieved by segregating these assets would be minimal.
To mitigate this risk and ensure that liquidity flows are driven by genuine risk preferences, we believe that it would be rational to align the collateral efficiency parameters of the Segregated E-Modes to be equivalent to those proposed for the Isolated Bluechip E-Modes. This parity ensures that users opting for segregation are doing so for the structural safety it provides, rather than an arbitrage on borrowing power. However, the final judgement on this matter should be provided by Aave’s growth SPs, specializing in revenue-related trade-offs.
WETH Liquidity Fragmentation
The migration of collateral from the central lending pools to segregated sToken wrappers presents risk to the depth of the WETH borrow market. A reduction in available WETH liquidity in the main pool, driven by migration to segregated modes, could exacerbate utilization spikes during market stress events, particularly during secondary market de-pegs of LSTs. During such events, deep WETH borrow liquidity is utilized heavily by arbitrageurs, making WETH utilization jump above the optimal threshold level. While the proposal sensibly suggests tight initial supply caps, we recommend an additional guardrail where sWETH supply cap increases are strictly conditional on the health of the main WETH market. Specifically, the diversion of liquidity to segregated modes should not be permitted to compress the liquidity buffer of the main WETH pool beyond optimal utilization levels.
Liquidation Bonus Consistency
Consistent with our analysis of the Isolated Bluechip E-Modes, we find the proposed 4% LB for the BTC E-Modes to be aggressive relative to the volatility profiles of the underlying assets. While segregated collateral eliminates rehypothecation risk, it does not mitigate the price volatility and liquidity risks. In rapid market downturn scenarios, a 4% margin may leave insufficient room for liquidator profitability after accounting for gas costs and slippage. Therefore, applying the same adjustment (maintaining LB at 5% for BTC E-Modes), as proposed in our previous analysis, would maintain a conservative safety margin that accounts for the operational realities of liquidation on both Mainnet and L2 networks without materially degrading the borrower experience.
Recommendations
LlamaRisk recommends aligning the collateral efficiency parameters (LTV and LT) of the Segregated E-Modes to match those of the Isolated Bluechip E-Modes. This parity is essential to isolate the variable of the efficiency preference and prevent a liquidity drain from pooled reserves. Furthermore, we advise implementing a 5% Liquidation Bonus across all segregated BTC markets, rather than the proposed 4%, to maintain proper incentivization to liquidators.
Regarding the rollout of sWETH, we recommend that supply cap increases be strictly gated by the utilization metrics of the core WETH pool; specifically, the segregated cap should not be raised if it risks pushing the pool’s utilization beyond the optimal point, thereby preserving the borrow buffer and stability required for LST leverage looping positions.
Disclaimer
This review was independently prepared by LlamaRisk, a DeFi risk service provider funded in part by the Aave DAO. LlamaRisk is not directly affiliated with the protocol(s) reviewed in this assessment and did not receive any compensation from the protocol(s) or their affiliated entities for this work.
The information provided should not be construed as legal, financial, tax, or professional advice.