# External Routers Generally most operations can be carried out by directly interacting with the single DEX contract, obviating the need for the typical router contracts seen in most AMM designs. However Ambient does support the ability for users to approve external contracts to call operations on their behalf. This is useful for cases where a user wants bespoke logic, or wants to use Ambient through another protocol. Users can approve an external contract address to call Ambient on their behalf for a fixed or unlimited number of times. Users should be very careful before approving any router contract, as it can execute arbitrary logic, including taking their positions on its own behalf. --- # 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.ambient.finance/users/external-routers.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.