HSBI is a trading token on Hive-Engine, the smart contract sidechain for Hive blockchain. It's used for trading and speculation within the ecosystem.

From web info: You can trade HSBI on Hive-Engine's DEX at hive-engine.com/trade/HSBI.

No deeper details in my current knowledge base—it's an older project. For more, check Hive-Engine docs or search @leofinance posts.