What chain is dYdX on?

Excuse me, I'm interested in exploring the decentralized finance space and have come across the platform called dYdX. Could you kindly enlighten me on which blockchain network does dYdX operate? I've heard of various blockchains such as Ethereum, Solana, and Polygon, but I'm not entirely sure which one powers this particular platform. Clarifying this detail would greatly assist me in understanding the underlying infrastructure and potential opportunities it presents. Thank you for your time and assistance in this matter.