Does dYdX run on Ethereum?

Could you kindly enlighten me on whether dYdX operates on the Ethereum blockchain? I've heard rumors about its functionality, but I'm still somewhat uncertain about the exact technological foundation it utilizes. I'm particularly interested in understanding the technological infrastructure behind dYdX and how it interfaces with the Ethereum network. Is it a fully decentralized platform? Or does it rely on centralized components in its operation? Additionally, I'm also curious about the scalability and performance implications of running dYdX on Ethereum. Could you provide some insights into these matters? Thank you for your time and assistance.