# `token.changeTransferPolicy`

Changes the transfer policy for a TIP-20 token. Requires the default admin role. [Learn more about transfer policies](https://docs.tempo.xyz/protocol/tip403/spec)

## Usage

:::code-group

```ts twoslash [example.ts]
import { client } from './viem.config'

const { receipt } = await client.token.changeTransferPolicySync({
  policyId: 1n,
  token: '0x20c0000000000000000000000000000000000000',
})

console.log('Transaction hash:', receipt.transactionHash)
// @log: Transaction hash: 0x1234567890abcdef1234567890abcdef1234567890abcdef1234567890abcdef
```

```ts twoslash [viem.config.ts] filename="viem.config.ts"
// [!include ~/snippets/tempo/viem.config.ts:setup]
```

:::

### Asynchronous Usage

The example above uses a `*Sync` variant of the action, that will wait for the transaction to be included before returning.

If you are optimizing for performance, you should use the non-sync `token.changeTransferPolicy` action and wait for inclusion manually:

```ts twoslash
import { Actions } from 'viem/tempo'
import { client } from './viem.config'

const hash = await client.token.changeTransferPolicy({
  policyId: 1n,
  token: '0x20c0000000000000000000000000000000000000',
})
const receipt = await client.waitForTransactionReceipt({ hash })

const { args } 
  = Actions.token.changeTransferPolicy.extractEvent(receipt.logs)
```

## Return Type

```ts
type ReturnType = {
  /** ID of the new transfer policy */
  newPolicyId: bigint
  /** Transaction receipt */
  receipt: TransactionReceipt
  /** Address that updated the policy */
  updater: Address
}
```

## Parameters

### policyId

* **Type:** `bigint`

New transfer policy ID.

### token

* **Type:** `Address | bigint`

Address or ID of the TIP-20 token.

### account (optional)

* **Type:** `Account | Address`

Account that will be used to send the transaction.

### feeToken (optional)

* **Type:** `Address | bigint`

Fee token for the transaction.

Can be an unpaused USD-denominated TIP-20 token address or ID. Use `client.fee.validateToken({ token })` to validate a token before submitting a transaction or setting it as a fee preference.

### feePayer (optional)

* **Type:** `Account | true`

Fee payer for the transaction.

Can be a [Viem Account](https://viem.sh/docs/accounts/local/privateKeyToAccount), or `true` if a [Fee Payer Service](https://docs.tempo.xyz/sdk/typescript/server/handler.feePayer) will be used.

### gas (optional)

* **Type:** `bigint`

Gas limit for the transaction.

### maxFeePerGas (optional)

* **Type:** `bigint`

Max fee per gas for the transaction.

### maxPriorityFeePerGas (optional)

* **Type:** `bigint`

Max priority fee per gas for the transaction.

### nonce (optional)

* **Type:** `number`

Nonce for the transaction.

### nonceKey (optional)

* **Type:** `'expiring' | bigint`

Nonce key for the transaction. Use `'expiring'` to use [expiring nonces (TIP-1009)](https://docs.tempo.xyz/protocol/tips/tip-1009), which enables concurrent transaction submission without nonce ordering.

### validBefore (optional)

* **Type:** `number`

Unix timestamp before which the transaction must be included.

### validAfter (optional)

* **Type:** `number`

Unix timestamp after which the transaction can be included.

### throwOnReceiptRevert (optional)

* **Type:** `boolean`
* **Default:** `true`

Whether to throw an error if the transaction receipt indicates a revert. Only applicable to `*Sync` actions.