What is the largest swap in crypto?

Can you clarify what you mean by "largest swap in crypto"? Are you referring to the largest cryptocurrency exchange in terms of trading volume, the largest decentralized exchange (DEX) in terms of liquidity, or perhaps the largest single trade that has ever taken place on a cryptocurrency exchange? Each of these interpretations would lead to a different answer, so it would be helpful to have a bit more context or clarification to provide an accurate response.