> ## 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.

# TransactionPayment

## Storage

### nextFeeMultiplier

**Namespace**

```
api.query.transactionPayment.nextFeeMultiplier
```

**Type**

```
function nextFeeMultiplier(

): u128
```

### storageVersion

**Namespace**

```
api.query.transactionPayment.storageVersion
```

**Type**

```
function storageVersion(

): PalletTransactionPaymentReleases
```

## Events

### TransactionFeePaid

A transaction fee `actual_fee`, of which `tip` was added to the minimum inclusion fee, has been paid by `who`.

**Namespace**

```
api.events.transactionPayment.TransactionFeePaid
```

**Type**

```
type TransactionFeePaid = {
  who: SeedPrimitivesSignatureAccountId20,
  actual_fee: u128,
  tip: u128
}
```

undefined## Constants

### operationalFeeMultiplier

A fee multiplier for `Operational` extrinsics to compute "virtual tip" to boost their `priority`

This value is multiplied by the `final_fee` to obtain a "virtual tip" that is later added to a tip component in regular `priority` calculations. It means that a `Normal` transaction can front-run a similarly sized `Operational` extrinsic (with no tip), by including a tip value greater than the virtual tip.

\`\`\`rust,ignore // For `Normal` let priority = priority\_calc(tip);

// For `Operational` let virtual\_tip = (inclusion\_fee + tip) \* OperationalFeeMultiplier; let priority = priority\_calc(tip + virtual\_tip); \`\`\`

Note: Since we use `final_fee` the multiplier applies also to the regular `tip` sent with the transaction. So, not only does the transaction get a priority bump based on the `inclusion_fee`, but we also amplify the impact of tips applied to `Operational` transactions.

**Namespace**

```
api.consts.transactionPayment.operationalFeeMultiplier
```

**Type**

```
type operationalFeeMultiplier = u8
```