> ## Documentation Index
> Fetch the complete documentation index at: https://docs.therootnetwork.com/llms.txt
> Use this file to discover all available pages before exploring further.

# FeeProxy

## Calls

### callWithFeePreferences

Call an internal call with specified gas token payment\_asset: The token to be used for paying gas fees. This is exchanged in OnChargeTransaction::withdraw\_fee() max\_payment: The limit of how many tokens will be used to perform the exchange call: The inner call to be performed after the exchange

**Namespace**

```
api.tx.feeProxy.callWithFeePreferences
```

**Type**

```
function callWithFeePreferences(
  payment_asset: u32,
  max_payment: u128,
  call: Call
)
```

undefined## Events

### CallWithFeePreferences

A call was made with specified payment asset

**Namespace**

```
api.events.feeProxy.CallWithFeePreferences
```

**Type**

```
type CallWithFeePreferences = {
  who: SeedPrimitivesSignatureAccountId20,
  payment_asset: u32,
  max_payment: u128
}
```

## Errors

### FeeTokenIsGasToken

The selected fee token is equal to the native gas token

**Namespace**

```
api.errors.feeProxy.FeeTokenIsGasToken
```

### NestedFeePreferenceCall

The inner call is a fee preference call

**Namespace**

```
api.errors.feeProxy.NestedFeePreferenceCall
```

## Constants

### feeAssetId

The native token asset Id (managed by pallet-balances)

**Namespace**

```
api.consts.feeProxy.feeAssetId
```

**Type**

```
type feeAssetId = u32
```