At the moment, only the Avalanche wallet allows interactions with the P and X chains.
Learn more about all Avalanche blockchains here. View the P-Chain API docs here and the X-Chain API docs here.
The Avalanche wallet only supports AVAX at the moment for transfer to the P-Chain. There is platform support for other assets from the X-Chain, but only programmatically. For example, when you create NFTs in the web wallet, you're creating the X-Chain assets.
For more info on how to interact with other types of X-Chain assets, besides AVAX, please check out our dev docs here and here.