DeFi Lending: Returns, Leverage, and Liquidation Risk
Jonathan Chiu and Furkan Danisman (Bank of Canada and University of Toronto) - 02/2026
- Aave V3, the largest DeFi lending protocol by Total Value Locked (TVL), demonstrates operational viability but faces constraints in capital efficiency, liquidation risk, and systemic fragility.
- DeFi lending protocols like Aave differ fundamentally from traditional banks in regulation, borrower identification, collateral types, intermediation, and risk management, relying on smart contracts and overcollateralization instead of human oversight and credit history.
- Aave V3's scale in 2024 was approximately $6.0 billion USD in lending volume, significantly smaller than major U.S. ($886 billion) and Canadian ($569 billion) banks, with a lower loan-to-deposit ratio of 40% compared to 61.2% and 74.2% respectively.
- The Net Interest Margin (NIM) for Aave V3 was 0.64%, substantially lower than U.S. (2.48%) and Canadian (1.69%) banks, reflecting lower operational overhead but also fewer services and less flexibility for borrowers.
- Aave V3 reported zero Non-Performing Loans (NPLs), contrasting with U.S. (0.59%) and Canadian (0.65%) banks, due to its automated liquidation system that preempts defaults.
- Protocol earnings on Aave V3 are concentrated, with WETH, USDT, and USDC accounting for nearly 83% of total earnings, despite weETH having the largest supply share (19.70%).
- A high supply share for a token does not guarantee high protocol earnings if its utilization rate remains low, as seen with weETH and wstETH.
- The Safety Module, Aave's decentralized insurance mechanism, saw its effective stake per supplied dollar decline from approximately 10 cents to 2 cents between V3's launch and 2025, indicating thinner backstop protection relative to activity scale.
- Margin trading via recursive leverage accounts for approximately 20.46% of total borrowed volume and 8.20% of borrowing transactions on Aave V3, indicating significant use for amplifying asset exposure.
- Users engaging in margin trading are disproportionately large investors (58%), operate with higher borrowing frequency (0.92 times/day vs 0.17), larger amounts, and have lower health factors (1.44 vs 1.84), leading to twice the liquidation rate.
- Liquidations on Aave V3 occur in concentrated waves, primarily triggered by sharp declines in major asset prices like ETH, rather than being evenly distributed.
- Four assets—WETH, wstETH, WBTC, and weETH—account for approximately 90% of the total liquidated value in USD, highlighting concentration risk in volatile assets.
- During liquidation waves, smaller positions tend to be liquidated earlier, but in the peak hours, liquidations become concentrated in larger positions.
- While most liquidation events involve small positions by count, a significant portion of the liquidated value within each wave is often attributable to a handful of large borrowers, with concentration increasing in later waves.
- The primary driver of health factor deterioration leading to liquidation is collateral price decline (97.28% for top 10 users, 84.40% for all users), with debt price and interest rate changes playing minor roles.
- Borrowers can incur combined losses from liquidation fees (5-10% of liquidated value) and opportunity costs (up to 10-30% of liquidated value) due to missed price recovery.
- Empirical analysis shows no statistically significant evidence that liquidation activity has a persistent impact on market prices, with any short-term effects being robust to benchmark controls.
- DeFi lending protocols are technically and operationally viable, offering transparency, automation, and low costs, but are limited by capital inefficiency, high liquidation risk, and potential systemic fragility from recursive leverage.
- Potential public sector roles in shaping decentralized lending include tokenizing real-world assets, developing decentralized identity frameworks, and exploring prudential regulations like capital requirements or leverage limits.
- Overcollateralization requirements in DeFi lending impose high capital costs and limit utility for real-world economic activities.
- The reliance on liquidation as a risk control mechanism can lead to sudden and significant borrower losses during market volatility.
- Widespread use of recursive leverage can amplify market movements and introduce systemic fragility within the crypto ecosystem.
- Aave V3's total lending volume in 2024 was approximately $6.0 billion USD, with a loan-to-deposit ratio of 40%.
- The average Net Interest Margin (NIM) for Aave V3 was 0.64% in 2024.
- Margin trading activity constituted 20.46% of total borrowed volume on Aave V3 between January 2023 and May 2025.
- Liquidations are primarily triggered by collateral price declines, accounting for over 84% of health factor deterioration for all users.
- Estimated borrower losses, including fees and opportunity costs, can range from 10% to 30% of the liquidated value.