Coin Metrics has indicated in a new report that so-called decentralized lending platforms like Aave form the backbone / infrastructural foundation of on-chain finance, allowing users to borrow assets while suppliers earn yields on otherwise idle holdings. Once dominated by incentive programs, Aave has matured into a seemingly more resilient ecosystem emphasizing stablecoin liquidity, premium collateral, and proper risk controls.
However, the April 2026 KelpDAO rsETH exploit delivered the protocol’s most severe real-world stress test, exposing vulnerabilities in pooled liquidity models while highlighting on-chain transparency’s value in observing market dynamics.
The incident began on April 18 around 17:38 UTC when an attacker supplied unbacked rsETH as collateral and withdrew roughly 126,000 WETH through multiple transactions.
WETH utilization already hovered near 89%, offering just an 11% liquidity cushion.
Available WETH liquidity plummeted from approximately 350,000 ETH to near zero within two hours as panicked depositors withdrew funds. Utilization surged to 100% and remained there, effectively freezing further withdrawals since all supplied ETH was borrowed.
Aave’s automated interest rate mechanism responded swiftly. Pre-exploit, WETH variable borrow rates stood at about 2.3% with supply APY around 1.9%, maintaining a tight spread indicative of balanced conditions.
As utilization exceeded the 92% kink point, rates escalated sharply: borrow APY climbed to 8.7% and supply APY to 7.4%, widening the spread from 0.57% to 1.31%.
This shift disrupted leveraged looping strategies common on the platform, where users deposit liquid staking or restaking tokens (LSTs/LRTs) like wstETH or rsETH, borrow WETH, and redeploy into more collateral to amplify yields.
A positive carry of roughly 1.7% (borrowing at 2.3% against ~4% staking rewards) reversed into a -4.7% loss, forcing many positions underwater and generating significant bad debt from the unbacked collateral.
The pressure quickly spread to stablecoin pools, which represent Aave’s primary liquidity reservoir.
Depositors raced to exit, driving utilization in USDT, USDC, USDe, and similar assets to 100%. Over $2 billion in stablecoin liquidity was extracted within 24 hours.
USDT experienced the most rapid drain, losing over 60% of available liquidity in about 1.2 hours, while USDC declined more steadily over roughly 11.4 hours.
Supply APYs, previously in the 2-3% range, spiked dramatically—reaching around 13% for USDT and USDC, with DAI briefly surpassing 24%.
This event illustrated the double-edged nature of Aave’s pooled liquidity design.
While it delivers superior capital efficiency and composability, risks from one asset—such as concentrated rsETH collateral (where ~86% of circulating supply was on Aave)—can cascade across markets.
In contrast, isolated models like those on Morpho limit contagion but fragment liquidity.
Post-exploit, total deposits on Aave v3 Core Ethereum dropped from $34.5 billion to $18.8 billion, and borrows fell from $13.8 billion to $7.9 billion, reflecting broad confidence erosion.
By May 2026, conditions stabilized. WETH liquidity recovered to around $620 million, utilization normalized to 80-90%, and community efforts like DeFi United raised over $300 million to cover the $123 million in bad debt.
Aave Horizon now appears to represent a forward-looking evolution. Launched in August 2025, this institutional-focused instance enables borrowing stablecoins against tokenized real-world assets (RWAs) such as short-duration Treasuries and money market funds from issuers including Superstate, VanEck, Ripple, and Janus Henderson.
It has grown to over $510 million in deposits and $172 million borrowed, bridging traditional finance with on-chain credit by allowing RWAs to generate yield without liquidation.
The KelpDAO episode underscores both the resilience and fragility of DeFi lending. The Coin Metrics report concluded that Aave integrates higher-quality collateral and institutional rails, it continues refining the balance between efficiency and risk management in decentralized markets.