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

# Approvals

> Attach the user's signed approval to an intent so it can be executed.

After an intent is created, an approval must be added before it can be executed. This endpoint attaches a signed approval to an existing intent. The approval proves the user has authorized the swap and allows it to proceed.

```http theme={null}
POST /affiliate/v1/intents/{intent_id}/approvals
```

## Request body

The body depends on the approval mechanism returned when the intent was created. It includes the approval `type` and the data signed by the user.

<Tabs>
  <Tab title="Permit2 (EVM, Tron)">
    ```json theme={null}
    {
      "type": "permit2",
      "signed_data": "0x..."
    }
    ```

    `signed_data` is the Permit2 signature. See [Signing for EVM](/product-suite/swap/api/intents/approvals/evm) and [Signing for Tron](/product-suite/swap/api/intents/approvals/tron).

    If the API returns [error code](/product-suite/swap/development/errors) **25**, the user has not yet approved Permit2 for the selected token. The user must approve Permit2 on-chain before continuing. See [Approve for Permit2](/product-suite/swap/on-chain-helpers/approve-for-permit2).
  </Tab>

  <Tab title="PSBT (Bitcoin)">
    ```json theme={null}
    {
      "type": "psbt",
      "signed_data": "cHNid..."
    }
    ```

    `signed_data` is the signed PSBT, Base64-encoded. See [Signing for Bitcoin](/product-suite/swap/api/intents/approvals/bitcoin).

    RGB USDT sources (`rgblock`) use the same `psbt` approval type. See [RGB USDT in Utexo Swap](/product-suite/swap/rgb#for-affiliates).
  </Tab>

  <Tab title="Cosign (Solana)">
    ```json theme={null}
    {
      "type": "cosign",
      "signed_data": {
        "transaction": "02000...",
        "user_address": "F8ZRdxvWEczGyxEBPiYraWCcMjv2sQZxuhh7BGETTDFg"
      }
    }
    ```

    `signed_data.transaction` is the signed versioned transaction, hex-encoded. See [Signing for Solana](/product-suite/swap/api/intents/approvals/solana).
  </Tab>
</Tabs>

## Example

```ts theme={null}
const BASE_URL = "https://api-swap.utexo.com/affiliate";

async function addApproval(intentId: string, approval: object): Promise<void> {
  const response = await fetch(`${BASE_URL}/v1/intents/${intentId}/approvals`, {
    method: "POST",
    headers: {
      "Content-Type": "application/json",
      "X-API-Key": process.env.UTEXO_SWAP_API_KEY!,
    },
    body: JSON.stringify(approval),
  });
  if (!response.ok) {
    throw new Error(`Approval failed: ${response.status} ${await response.text()}`);
  }
}
```