# Is there a cost to use Sentinel3?

When you install Kerberus Sentinel3 you are enrolled by default into the Pro version.

<figure><img src="/files/SFJ5WZJ9ZGW5obZbYABS" alt=""><figcaption></figcaption></figure>

In the Pro version we charge a small fee on some swaps on select DEXes. You can read more in our [**Terms of Use**](https://www.kerberus.com/terms-of-use/).

<figure><img src="/files/nAZzWZMSrnyq0A4LPdfp" alt=""><figcaption></figcaption></figure>

You can downgrade to the Free version at any time by clicking in your Sentinel3 extension on your browser, Settings, Downgrade to Free.


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# 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.kerberus.com/kerberus/frequently-asked-questions/software-faq/is-there-a-cost-to-use-sentinel3.md?ask=<question>
```

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.