> ## Documentation Index
> Fetch the complete documentation index at: https://docs.0x0.exchange/llms.txt
> Use this file to discover all available pages before exploring further.

# Order Book

Spectre implements a standard **Limit Order Book (LOB)**.

* **Bids**: Buy orders, sorted by Price DESC, then by Time ASC (Price-Time Priority).
* **Asks**: Sell orders, sorted by Price ASC, then by Time ASC.

When an incoming order crosses the spread (e.g., a Buy order with price >= best Sell price), a trade occurs immediately.

## Precision (Scaled Integers)

To avoid floating-point errors, Spectre uses **Scaled Integers** for all core arithmetic in the matching engine.

* **Price Scale**: `100` (2 decimal places)
  * Example: A price of `$10.50` is represented internally as `1050`.
* **Quantity Scale**: `100,000,000` (8 decimal places)
  * Example: A quantity of `1.5 BTC` is represented internally as `150000000`.

> **Note**: The API handles this conversion automatically. You should send standard floats (e.g., `10.50`, `1.5`) in your JSON-RPC requests, and the API layer will convert them before passing them to the engine.