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

# Order books

> Perpetual order book snapshots across venues.

Bid and ask levels at a point in time.

Hyperliquid and Lighter books include spot. On Lighter, filter `market_type = 'perpetuals'`. On Hyperliquid, perp coins are symbols (`BTC`); spot coins are `@N` IDs.

| Protocol          | Table                                                                                              | Schema                  |
| ----------------- | -------------------------------------------------------------------------------------------------- | ----------------------- |
| Hyperliquid       | [orderbook\_snapshots](/historical-data/supported-blockchains/hyperliquid/raw/orderbook-snapshots) | `hyperliquid.raw`       |
| Lighter           | [order\_books](/historical-data/supported-blockchains/lighter/dex/order-books)                     | `lighter.dex`           |
| Lighter Robinhood | [order\_books](/historical-data/supported-blockchains/lighter-robinhood/dex/order-books)           | `lighter_robinhood.dex` |
| Kalshi            | [orderbook](/historical-data/perpetuals/kalshi/orderbook)                                          | `common.perpetuals`     |