Hourglass is a decentralized finance (DeFi) protocol that enhances liquidity for time-bound and semi-fungible tokens. It comprises two main components: Hourglass Boost and Hourglass Marketplace. Hourglass Boost allows users to "time-boost" their assets, receiving time-bound tokens (TBTs) that represent receipts for assets locked in a vault earning boosted yield. The Hourglass Marketplace operates as a request-for-quote (RFQ) platform, connecting protocols with market makers to facilitate the buying and selling of TBTs, thereby providing liquidity for these specialized tokens.