> For the complete documentation index, see [llms.txt](https://docs.vdex.trade/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.vdex.trade/trading/order-book.md). # Order Book VDEX operates a central limit order book with bids and asks sorted by price. Orders can be placed in integer multiples of the [asset tick size](/trading/contract-specifications.md). Orders are matched in price-time priority. The clearing house verifies margin during order creation and matching. If margin is insufficient to cover the full order, it will be reduced until a partial match can be executed. VDEX orders execute peer-to-peer via [Virtual Rollups](https://docs.virtuallabs.xyz/technology/primatives/virtual-rollup), not through a centralized backend or blockchain. Transactions are not batched and are executed in the order received. This prevents MEV attack vectors whereby orders are placed and processed jointly. --- # Agent Instructions This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com. ## Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation by asking a question. Perform an HTTP GET request on the following URL with the `ask` and `goal` query parameters: ``` GET https://docs.vdex.trade/trading/order-book.md?ask=&goal= ``` `ask` is the immediate question: it should be specific, self-contained, and written in natural language. `goal` is what the user is ultimately trying to achieve, the reason they need the answer. Sharing it helps GitBook give you a better, more relevant answer. A goal is most helpful when it describes the outcome the user wants rather than restating the question. For example, with `ask=how do I create an API token`, a goal like `automate deployments from our CI pipeline` lets GitBook tailor the answer to that use case. 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.