# WDYM City Nodes Purchase & Setup Anyone can start operating a City Node, simply download, install, and run the software. However, purchasing at least one Sentry License Key is required to earn rewards. Sentry nodes that are not running do not accrue rewards, even with a license key. Therefore, operators will want to ensure that their nodes are online and running. --- # 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://wdym.gitbook.io/document/wdym-city-nodes-purchase-and-setup.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.