> For the complete documentation index, see [llms.txt](https://docs.kerberus.com/kerberus/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.kerberus.com/kerberus/frequently-asked-questions/software-faq/is-there-a-cost-to-use-sentinel3.md).

# 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.