Yes, Matic is used to pay the fees on Polygon, while ETH is used to pay the fees on Ethereum mainnet. Matic is a Layer 2 scaling solution that is built on top of Ethereum and provides a platform for developers to build and deploy their decentralized applications (dApps). It uses Plasma-based sidechains to enable faster, cheaper, and more secure transactions. The fees on Polygon are much lower than those on Ethereum mainnet, making it a great choice for developers who want to deploy their dApps quickly and cheaply.