What are the most liquid swaps?

Could you elaborate on what you mean by "most liquid swaps" in the context of cryptocurrency and finance? Are you referring to decentralized exchanges (DEXs) that offer high trading volumes and low slippage for swapping one cryptocurrency for another? Or are you interested in specific swap pairs that tend to have high liquidity, such as stablecoin-to-stablecoin swaps or popular cryptocurrency pairs like Bitcoin-to-Ethereum? Understanding your question more precisely will help me provide a more accurate and informative answer.