> For the complete documentation index, see [llms.txt](https://docs.valantis.xyz/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.valantis.xyz/amms-and-vaults/design-space/modules/gauge.md).

# Gauge

<figure><img src="https://986147118-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F1hNJeG4CApeBcE2NlR61%2Fuploads%2Fgit-blob-bb0f7f5e528ce58b98e99164755a652cc408612a%2FGauge%20Fig.%201_V2%20(1).jpg?alt=media" alt=""><figcaption><p>Gauge in context</p></figcaption></figure>

`gauge` is an optional module that a pool manager can share a portion of `poolManagerFees` with.

The `gauge` plays an important role in the tentative Valantis token incentive mechanism.

`feeProtocol0` and `feeProtocol1` are the input variables in the Sovereign Pool function `claimProtocolManagerFees` that determine the percentage of pool manager fees shared with the gauge, represented in bips.

The initial Valantis incentive mechanism has not been launched, proper specs for this `gauge` will be released at this time. `gauge` can be set to any contract which benefits from having a portion of fees sent to it, such as an external protocol treasury or similarly designed token incentive mechanism. Any address can be set to `gauge` as long as it is able to call `claimProtocolFees` on the Sovereign Pool.

The Gauge’s only role is to call the `claimProtocolFees`. Protocol fees are incremented whenever `poolManager` calls the `claimPoolManagerFees` function, and if it chooses to allocate a non-zero portion of its earned fees into the `gauge`.

**Note:** Rebase tokens are not supported as protocol fees because pool manager fees are not incremented in the case of rebase tokens. This was a deliberate choice to yield a simpler design for the Sovereign Pool and peripheral governance contracts related to Gauges and VAL emissions.

Only `protocolFactory` can deploy and set a `gauge` for a Sovereign Pool, by calling `setGauge`, and it can do so only once.