> ## Documentation Index
> Fetch the complete documentation index at: https://hedera-0c6e0218-docs--429.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# FixedFee

A fixed number of units (hbar or token) to assess as a fee during a CryptoTransfer that transfers units of the token to which this fixed fee is attached.

| Field                   | Type                                                            | Description                                              |
| ----------------------- | --------------------------------------------------------------- | -------------------------------------------------------- |
| `amount`                | int64                                                           | The number of units to assess as a fee                   |
| `denominating_token_id` | [TokenID](/hedera/sdks-and-apis/hedera-api/basic-types/tokenid) | The denomination of the fee; taken as hbar if left unset |