# Extend with Rest API

To use this feature you must have the API key. Read [here](https://docs.tronsave.io/developer/get-api-key) to view how to get our API key

## [**Buy with API Key (Postman)**](https://www.postman.com/tronsave/tronsave/folder/z5xq9ux/extend-order-with-api-key)

## Step 1: Check all extendable delegates 

<mark style="color:orange;">`POST`</mark> `https://api.tronsave.io/v0/get-extendable-delegates`

Check extendable delegates by [API-key](https://docs.tronsave.io/developer/get-api-key)

Rate limi&#x74;***: 1** request per **1** seconds*

#### Headers

<table><thead><tr><th width="134">Name</th><th width="143">Type</th><th>Description</th></tr></thead><tbody><tr><td>apikey<mark style="color:red;">*</mark></td><td>String</td><td>Tronsave api key that present for internal account</td></tr></tbody></table>

#### Request Body

<table><thead><tr><th width="166">Name</th><th width="167">Type</th><th>Description</th></tr></thead><tbody><tr><td>extend_to<mark style="color:red;">*</mark></td><td>String</td><td>Time in milliseconds you want to extend to</td></tr><tr><td>max_price</td><td>Number</td><td>Number maximum price you want to pay to extend</td></tr><tr><td>receiver</td><td>String</td><td>The address that received resource delegate </td></tr></tbody></table>

{% tabs %}
{% tab title="200: OK Success" %}

```javascript
  {
            "extend_order_book": [
                {
                    "price": 133,
                    "value": 64319
                },
                ...
            ], //Overview extend energy amount at every single price
            "total_delegate_amount": 64319, 
            //Total current delegate of receiver address in tronsave
            "total_available_extend_amount": 64319,
            //Total available delegate of receiver address in tronsave
            "total_estimate_trx": 8554427,
            //Estimate TRX payout if using extend_data below to create extend request
            "your_balance": 20000000,
            //api key's internal balance 
            "is_able_to_extend": true,
            //Compare balance and total_estimate_trx 
            "extend_data": [
                {
                    "delegator": "TMN2uTdy6rQYaTm4A5g732kHRf72tKsA4w",
                    "is_extend": true,
                    "extra_amount": 0,
                    "extend_to": 1728459019000
                }
            ]
            //Extend data that are used to create extend requests below
}
```

{% endtab %}

{% tab title="401: Unauthorized Invalid api key" %}

```
{
    "API_KEY_REQUIRED": "Missing api key in headers",
    "INVALID_API_KEY":"api key not correct"
}
```

{% endtab %}

{% tab title="429: Too Many Requests Rate limit reached" %}

```
{
    "RATE_LIMIT": "Rate limit reached",
}
```

{% endtab %}
{% endtabs %}

*Example*

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

```java
{
    "extend_to":1728704969000,
    "max_price":165,
    "receiver":"TFwUFWr3QV376677Z8VWXxGUAMF11111111"
}
```

{% endtab %}

{% tab title="Headers" %}

```java
{
  "apikey": <YOUR_API_KEY>
}
```

{% endtab %}

{% tab title="Success Response" %}

```java
{
    "extend_order_book": [
        {
            "price": 108,
            "value": 100000
        },
        {
            "price": 122,
            "value": 200000
        }
    ],
    "total_delegate_amount": 500000,
    "total_available_extend_amount": 300000,
    "total_estimate_trx": 24426224,
    "is_able_to_extend": true,
    "your_balance": 37780396,
    "extend_data": [
        {
            "delegator": "TQBV7xU489Rq8ZCsYi72zBhJM2222222",
            "is_extend": true,
            "extra_amount": 0,
            "extend_to": 1728704969000
        },
        {
            "delegator": "TMN2uTdy6rQYaTm4A5g732kHR333333333",
            "is_extend": true,
            "extra_amount": 0,
            "extend_to": 1728704969000
        }
    ]
}
```

{% endtab %}
{% endtabs %}

*Example Code*

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

<pre class="language-javascript"><code class="lang-javascript">const GetEstimateExtendData = async () => {
    const url = `https://api.tronsave.io/v0/get-extendable-delegates`
<strong>    const body = {
</strong>        "extend_to": extend_to, //time in milliseconds you want to extend to
        "receiver": RECEIVER,   //the address that receives resource delegate
        "max_price": max_price, //Optional. Number maximum price you want to pay to extend
    }
    const data = await fetch(url, {
            method: "POST",
            headers: {
                'apikey': API_KEY,
                "content-type": "application/json",
            },
            body: JSON.stringify(body)
        })
    const response = await data.json()
        /**
         * Example response:
         {
            "extend_order_book": [
                {
                    "price": 133,
                    "value": 64319
                }
            ],
            "total_delegate_amount": 64319,
            "total_available_extend_amount": 64319,
            "total_estimate_trx": 8554427,
            "is_able_to_extend": true,
            "your_balance": 20000000,
            "extend_data": [
                {
                    "delegator": "TMN2uTdy6rQYaTm4A5g732kHRf72tKsA4w",
                    "is_extend": true,
                    "extra_amount": 0,
                    "extend_to": 1728459019000
                }
            ]
        }
         */
        return response
}
</code></pre>

{% endtab %}

{% tab title="cURL" %}

```powershell
curl --location 'https://api.tronsave.io/v0/get-extendable-delegates' \
--header 'apikey: {{apikey}}' \
--data '
{
 "extend_to": {{extend_timestamp_in_millisecs}}, 
 "receiver": {{receiver_address}},   
 "max_price": {{max_price_per_unit_want_to_pay}}, 
}
'
```

{% endtab %}
{% endtabs %}

## Step 2:  Create an extend request by API key

<mark style="color:orange;">`POST`</mark> `https://api.tronsave.io/v0/internal-extend-request`

Create a new extend request order by [API-key](https://docs.tronsave.io/developer/get-api-key)

Rate limi&#x74;***: 15** request per **1** seconds*

#### Headers

<table><thead><tr><th width="135">Name</th><th width="154">Type</th><th>Description</th></tr></thead><tbody><tr><td>apikey<mark style="color:red;">*</mark></td><td>String</td><td>Tronsave api key that present for internal account</td></tr></tbody></table>

#### Request Body

<table><thead><tr><th width="170">Name</th><th width="152">Type</th><th>Description</th></tr></thead><tbody><tr><td>receiver<mark style="color:red;">*</mark></td><td>String</td><td>The address that received resource</td></tr><tr><td>extend_data<mark style="color:red;">*</mark></td><td>Array</td><td>Array extends data. Get it at a response of API estimate extendable delegate</td></tr></tbody></table>

{% tabs %}
{% tab title="200: OK Success" %}
return array of order ids if success

```json
[<order_id_1>,<order_id_2>,...]
```

{% endtab %}

{% tab title="401: Unauthorized Invalid api key" %}

```json
{
    "API_KEY_REQUIRED": "Missing api key in headers",
    "INVALID_API_KEY":"api key not correct"
}
```

{% endtab %}

{% tab title="429: Too Many Requests Rate limit reached" %}

```json
{
    "RATE_LIMIT": "Rate limit reached",
}
```

{% endtab %}
{% endtabs %}

*Example*&#x20;

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

```json
{
    "extend_data":[
        {
            "delegator": {{some_delegator_address}},
            "is_extend": true,
            "extra_amount": 0,
            "extend_to": {{extend_timestamp_in_millisecs}}
        },
        ...
    ],
    "receiver":{{receiver_address}}
}
```

{% endtab %}

{% tab title="Headers" %}

```json
{
  "apikey": <YOUR_API_KEY>
}
```

{% endtab %}

{% tab title="Success Response" %}

```json
["651d2306e55c073f6ca0992e","651d2306e55c073f6ca09923",...]
```

{% endtab %}
{% endtabs %}

*Example Code*

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

```javascript
const SendInternalExtendRequest = async () => {
    const url = `https://api.tronsave.io/v0/internal-extend-request`
    const body = {
            "extend_data": [    
                {
                    "delegator": {{some_delegator_address}},
                    "is_extend": true,
                    "extra_amount": 0,
                    "extend_to": {{extend_timestamp_in_millisecs}}
                }
            ],
            "receiver": RECEIVER,
        }
    const data = await fetch(url, {
            method: "POST",
            headers: {
                'apikey': API_KEY,
                "content-type": "application/json",
            },
            body: JSON.stringify(body)
        })
    const response = await data.json()
        /**
         * Example response 
         * @link  //TODO
           [<order_id>]
         */
        return response
    }
    return []
}
```

{% endtab %}

{% tab title="cURL" %}

```powershell
curl --location 'https://api.tronsave.io/v0/internal-extend-request' \
--header 'apikey: {{apikey}}' \
--data '
{
    "extend_data":[
        {
            "delegator": {{some_delegator_address}},
            "is_extend": true,
            "extra_amount": 0,
            "extend_to": {{extend_timestamp_in_millisecs}}
        },
        ...
    ],
    "receiver":{{receiver_address}}
}
'
```

{% endtab %}
{% endtabs %}