UXD Pool contains UXD, a decentralized stablecoin, backed 100% by positions. It also contains UXP, the governance token of UXD Protocol.
Users deposit SOL to mint UXD, and UXD hedges the price of SOL using perps. UXD is currently transitioning to the Asset Liability Module due to Mango (which UXD was initially based on being frozen post-exploit.
Both prices are detected using Switchboard, the links are available on the UI below the deposit button.