# Do you work with fixed rates? We do not work with a fixed price list system: our ad serving technology works with a real time bidding system, where advertisers compete to buy traffic. This means that the cost of every campaign will vary accordingly to the market situation and the selected targeting parameters. Information about current Top CPM/CPC bid for the selected audience will be available to you when creating or modifying a campaign. --- # 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://help.dtxplatform.com/advertisers-help-center/do-you-work-with-fixed-rates.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.