Our goal is to support every chain on Moralis. For the moment, we fully support Ethereum, BSC (Binance Smart Chain), Polygon, Avalanche and Fantom. Moralis also supports user authentication for Elrond and Polkadot.
You can find the current and future syncing status at: https://moralis-status.web.app/
You're welcome to add unsupported blockchains as a feature request to our roadmap page, as well as upvote any feature request - https://roadmap.moralis.io/