# Order Book Our global order book aggregates data from the largest cryptocurrency exchanges in real time, summing all buy and sell orders. This allows you to see how much BTC is currently available for sale and purchase in the market. ### Applications * Detecting where the largest sell/buy wall is * Calculating how much the price could potentially fall/rise from such a wall * Data refreshed every 10 seconds, providing quick insight into current information * Ability to select any set of exchanges included in the order sum * With this tool, you know where to place your order to be one step ahead of others --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.oxdata.io/features/order-book.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.