STX refers to the Stacks cryptocurrency, which is associated with the Stacks blockchain. It is designed to bring smart contracts and decentralized applications (DApps) to the Bitcoin network. Users can earn STX by participating in the Stacks 2.0 blockchain, which uses a unique consensus mechanism called Proof of Transfer (PoX). Keep in mind that cryptocurrency values can be volatile, so it's advisable to stay informed about market trends if you are considering investing or using STX.