An order book is a ledger that tracks the buy and sell orders placed for a specific digital asset or trading pair on an exchange. It displays the current list of orders, including prices and quantities. The order book consists of a bid side (buy orders) and an ask side (sell orders). The order book is a live and continuously updated record that reflects real-time changes as new orders are submitted and existing orders are executed.

NOTE: In Primex, automated trade execution is handled by Keepers, which are the network of nodes running special software. Keepers replace traditional order books and centralized backends. They execute Limit, Stop Loss, and Take Profit orders and have the important role of liquidating the positions of traders whose margin falls below the maintenance level.