Which DeFi exploit worsened the selloff?

TLDR

Yearn Finance (YFI) suffered an exploit in its yETH liquidity pool that enabled unlimited yETH minting, draining the pool and jolting markets early Monday (yearn incident).

1. The attack led to over $400 million in leveraged liquidations, accelerating the selloff (liquidations data).
2. A prior $128 million Balancer hack added pressure to DeFi sentiment ahead of the drop (Balancer exploit).

Deep Dive

1. Yearn Exploit Mechanics

The yETH pool exploit allowed an attacker to mint vast amounts of yETH, effectively flooding the pool and undermining confidence in its backing assets, which sparked broad risk-off behavior across crypto (yearn incident).

1. Reports indicate roughly 1,000 ETH was routed through Tornado Cash after the drain, with attack contracts self-destructing post-execution (attack details).
2. The shock triggered over $400 million in forced liquidations of longs, suggesting traders were positioned for a rebound and got caught by the sudden drawdown (liquidations data).

2. Balancer Context

Days before, Balancer was hit by one of the years largest DeFi hacks, with losses around $128 million across V2 pools on multiple chains (Balancer exploit).

1. Balancer maker/">DAO began discussing an $8 million recovery plan for affected LPs, outlining snapshot-based distributions and whitehat bounties (recovery plan).
2. The sequence of major DeFi incidents likely primed markets to react more defensively when the Yearn issue surfaced.

Conclusion

The selloff was worsened by the Yearn Finance yETH exploit, which triggered broad deleveraging after confidence in a major DeFi pool broke, and it came on the heels of the large Balancer hack that already weakened sentiment. Together, these events made traders quicker to exit risk, turning a localized incident into a market-wide drawdown.

Confidence: high because multiple independent reports link the Yearn incident to the accelerated declines and quantify the liquidation impact.