> ## Documentation Index
> Fetch the complete documentation index at: https://docs.marketlens.app/llms.txt
> Use this file to discover all available pages before exploring further.

# HIP-4 (WIP)

> Hyperliquid prediction markets with dual yes/no order books.

HIP-4 markets on Hyperliquid use dual **yes/no** order books. MarketLens treats them with the same tools as other markets, with special support for the two-book structure.

Mechanics overview: [Prediction markets](/prediction-markets). Official spec: [HIP-4: Outcome markets](https://hyperliquid.gitbook.io/hyperliquid-docs/hyperliquid-improvement-proposals-hips/hip-4-outcome-markets).

*Product screenshots and usage notes to come.*