Binance Research reported that April’s decentralized finance ( DeFi) exploits triggered around $13 billion in outflows, draining total value locked (TVL) across lending markets and decentralized exchanges. The flight pushed the onchain leverage ratio to about 38%, a reading the firm said marks a return to 2021 levels all while showcasing a massive decline in investor confidence.

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The outflows can largely be traced back to a cluster of attacks, the largest of which struck liquid- staking protocol KelpDAO. Bitcoin.com News reported that KelpDAO had slammed Layerzero after a roughly $300 million exploit, later shifting its rsETH token to Chainlink’s cross-chain protocol, CCIP, in response.

The breach also rattled the wider ecosystem with lending protocol Aave battling a withdrawal crisis as depositors rushed for the exits. Confidence cracked further when Aave suffered a 44% monthly drop in value locked and outflows spread to neighboring protocols.

The attack’s mechanics unearthed a growing cross-chain threat with Layerzero, most recently, disclosing a remote procedure call (RPC) poisoning incident linked to the $292 million KelpDAO hack, in which attackers corrupted the data feeding the bridge’s verification network.

April stood out even in a sector accustomed to breaches as industry trackers counted more than 20 separate exploits during the month, making it one of the most-hacked stretches on record. Aave alone saw billions in deposits exit within 48 hours, and several protocols paused certain operations as trust eroded.

Even then, the sector has shown resilience, with several protocols migrating cross-chain messaging to alternative providers and tightening verification. Binance Research and other analysts have argued that DeFi is evolving, citing the speed at which liquidity has historically returned as confidence has stabilized.

The 38% leverage reading is the figure to watch next, given that a return toward 2021 levels could mean the system has deleveraged sharply (potentially reducing the risk of forced liquidations and signaling diminished risk appetite). In any case, whether deposits rebuild from here will determine if April marked a temporary shock or a longer reset for onchain finance.

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