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# Change Token Transfer Policy \[token.changeTransferPolicy]

Changes the transfer policy ID 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.transaction.waitForReceipt({ hash }).receipt

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

## Recipes

### Launch a Token with a KYC Allowlist

Combine [`policy.createSync`](/tempo/actions/policy.create) with `token.changeTransferPolicySync` to gate a new token to KYC-verified accounts from the first transfer.

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

const { policyId } = await client.policy.createSync({ // [!code focus]
  addresses: ['0x742d35Cc6634C0532925a3b844Bc9e7595f0bEbb'], // [!code focus]
  type: 'whitelist', // [!code focus]
}) // [!code focus]

const { receipt } = await client.token.changeTransferPolicySync({
  policyId, // [!code focus]
  token: '0x20c0000000000000000000000000000000000000',
})
```

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

### Verify Membership Before Migrating Policies

Check critical accounts against the new policy with [`policy.isAuthorized`](/tempo/actions/policy.isAuthorized) before switching, so a compliance migration never strands your treasury or settlement partners.

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

const newPolicyId = 2n
const treasury = '0x8ba1f109551bD432803012645Ac136ddd64DBA72'

const isAuthorized = await client.policy.isAuthorized({ // [!code focus]
  policyId: newPolicyId, // [!code focus]
  user: treasury, // [!code focus]
}) // [!code focus]
if (!isAuthorized) throw new Error('treasury is not on the new policy') // [!code focus]

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

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

## Return Value

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

## 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.

### feePayer (optional)

* **Type:** `Account | boolean`

Fee payer for the transaction (TIP-1 gas sponsorship).

Pass `true` to defer the fee token to an external fee payer (e.g. a relay), or a local Account to co-sign the transaction as the fee payer.

### feeToken (optional)

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

Fee token for the transaction.

Can be an unpaused USD-denominated TIP-20 token address or ID.

### gas (optional)

* **Type:** `bigint`

Gas limit for the transaction.

### keyAuthorization (optional)

* **Type:** `KeyAuthorization`

Signed key authorization to include with the transaction, authorizing an access key to act for the sending account.

### 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' | 'random' | bigint`

Nonce key for the transaction (TIP-1009 2D nonces).

Use `'expiring'` to select an expiring nonce, which enables concurrent transaction submission without nonce ordering. Use `'random'` to select a random key.

### throwOnReceiptRevert (optional)

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

Whether a `Sync` action throws when the receipt reports a revert.

### validAfter (optional)

* **Type:** `number`

Unix timestamp after which the transaction can be included.

### validBefore (optional)

* **Type:** `number`

Unix timestamp before which the transaction must be included.