amm

Pendle is a permissionless yield-trading protocol on Ethereum, launched in 2021 by TN Lee and Vu Nguyen, that allows users to separate and trade the principal and yield components of yield-bearing assets. In September 2024, Penpie — an independent yield optimizer built on top of Pendle — suffered a $27 million reentrancy exploit that was made possible in part by Pendle's permissionless market creation design. Although Pendle's own contracts were not directly exploited, the protocol's architecture contributed to the attack surface, and all 11,261 ETH in stolen funds were subsequently laundered through Tornado Cash.

Velodrome Finance is an automated market maker (AMM) and decentralized exchange (DEX) launched on June 2, 2022, on the Optimism Layer 2 network. It is a fork and improvement of Andre Cronje's Solidly Exchange, implementing a ve(3,3) governance and liquidity incentive model. The protocol has experienced three documented security incidents: an insider theft of $350,000 by a team member in August 2022, a DNS/frontend social-engineering attack in November–December 2023 resulting in approximately $250,000 in user losses, and a second DNS hijacking in November 2025 attributed to a NameSilo registrar insider, resulting in estimated losses of $700,000–$1,000,000. Smart contracts have not been directly exploited; all monetary losses have stemmed from front-end and operational security failures.