Is there a dex on base?

Excuse me, could you clarify your question? Are you asking if there exists a decentralized exchange, commonly referred to as a DEX, operating on a particular blockchain base or platform? If so, the answer would depend on the specific blockchain or platform you're referring to. Many blockchain networks support DEXs, which allow users to trade digital assets directly with each other without the need for a centralized intermediary. The availability and popularity of DEXs can vary greatly depending on the blockchain ecosystem and the demand for decentralized trading services.