This dataset accompanies the paper "An Open Book: Level 4 Order Book Data from the Hyperliquid Exchange." It contains three data streams from the Hyperliquid decentralized perpetual futures exchange: - Order statuses (Dec 2025): Complete order lifecycle events for BTC, ETH, and SOL perpetual contracts, including rejected orders — data typically unavailable from any exchange. Custom binary format, 54 bytes per record. ~880 million records per day. - Raw book diffs (Dec 2025): Every change to the visible limit order book for BTC, ETH, and SOL. Gzip-compressed JSON lines. - Trades (Oct 2025 – Jan 2026): Trade execution data for all 250+ perpetual contracts. Gzip-compressed JSON lines. Includes lookup tables, a Python reader (read_data.py), and full schema documentation (SCHEMA.md). See README.md for quick start instructions.