One such service is LeetSwap, which describes itself as the "The #1 DEX ecosystem for elite degens built on the leetest blockchains", and which recently launched its service on Base. On August 1, LeetSwap was exploited after an attacker discovered a function that allowed them to manipulate token prices on the project for a profit of around 342 ETH (~$624,000).
LeetSwap attempted to contact the hacker via social media, asking them to return all but 50 ETH (~$92,000, or around 15% of the stolen funds).