# Token Approval

<mark style="color:green;">`POST`</mark> `/approve`

This endpoint generates an unsigned transaction for approving token spending. The approval transaction lets a smart contract (or a specified sender address) spend a given amount of tokens on behalf of the recipient. If a sender is provided, the approval will be generated using that address (and only the ENSC asset type is allowed in that case). Otherwise, the recipient’s address is used.

**Headers**

| Name          | Value              |
| ------------- | ------------------ |
| Content-Type  | `application/json` |
| Authorization | `Bearer <api_key>` |

**Body**

<table><thead><tr><th width="151">Name</th><th width="121">Type</th><th>Description</th></tr></thead><tbody><tr><td><code>recipient</code></td><td>string</td><td>The wallet address that will receive the approval.</td></tr><tr><td><code>assetType</code></td><td>string</td><td>The asset type, provided as an enum value (e.g., <code>ENSC</code>, <code>USDC</code>, <code>USDT</code>, etc.).</td></tr><tr><td><code>amount</code></td><td>number</td><td>The amount to approve.</td></tr><tr><td><code>sender</code></td><td>string</td><td><em>Optional.</em> If provided, the approval will be generated using this address instead of the recipient. When provided, only <code>ENSC</code> is allowed as the asset type.</td></tr></tbody></table>

Example 1: Approval for Redeeming Assets (No Sender Provided)

**Request**

{% tabs %}
{% tab title="Body" %}

```json
{
  "recipient": "0xRecipientAddressABC123",
  "assetType": "USDC",
  "amount": 50
}
```

{% endtab %}

{% tab title="Response (200) Ok" %}

```json
{
  "status": 200,
  "message": "Unsigned approve transaction generated successfully",
  "data": {
    "to": "0xTokenContractAddressXYZ",
    "value": 0,
    "gasLimit": "0x186a0",
    "gasPrice": "20000000000",
    "nonce": "5",
    "data": "0x095ea7b3000000000000000000000000DEXContractAddressDEF4560000000000000000000000000000000000000000000000000000000000000032",
    "from": "0xRecipientAddressABC123",
    "spender": "0xDEXContractAddressDEF456"
  }
}
```

{% endtab %}

{% tab title="Invalid Recipient (400) bad" %}

```json
{
  "status": 400,
  "error": "Invalid Request",
  "message": "Invalid recipient address",
  "data": null
}
```

{% endtab %}
{% endtabs %}

Example 2: Approval for Transfers (Sender Provided)

**Response**

{% tabs %}
{% tab title="Body" %}

```json
{
  "recipient": "0xRecipientAddressABC123",
  "sender": "0xSenderAddress987654",
  "assetType": "ENSC",
  "amount": 10
}
```

{% endtab %}

{% tab title="Response (200) Ok" %}

```json
{
  "status": 200,
  "message": "Unsigned approve transaction generated successfully",
  "data": {
    "to": "0xTokenContractAddressXYZ",
    "value": 0,
    "gasLimit": "0x186a0",
    "gasPrice": "20000000000",
    "nonce": "12",
    "data": "0x095ea7b3000000000000000000000000SenderAddress987654000000000000000000000000000000000000000000000000000000000000000a",
    "from": "0xSenderAddress987654",
    "spender": "0xSenderAddress987654"
  }
}
```

{% endtab %}

{% tab title="Invalid Asset When Sender is Provided (400) bad" %}

```json
{
  "status": 400,
  "error": "Invalid Asset",
  "message": "When a sender is provided, only ENSC asset type is allowed",
  "data": null
}
```

{% endtab %}
{% endtabs %}