# getGaslessApprovalTokens

GET https://api.0x.org/gasless/gasless-approval-tokens

Get token addresses that support gasless approvals

Reference: https://docs.0x.org/api-reference/openapi-json/gasless/getgaslessapprovaltokens

## OpenAPI Specification

```yaml
openapi: 3.1.0
info:
  title: 0x API
  version: 1.0.0
paths:
  /gasless/gasless-approval-tokens:
    get:
      operationId: getgaslessapprovaltokens
      summary: getGaslessApprovalTokens
      description: Get token addresses that support gasless approvals
      tags:
        - subpackage_gasless
      parameters:
        - name: chainId
          in: query
          description: >-
            Chain ID. See
            [here](https://0x.org/docs/developer-resources/supported-chains) for
            the list of supported chains
          required: true
          schema:
            type: integer
        - name: 0x-api-key
          in: header
          description: Visit dashboard.0x.org to get your API Key
          required: true
          schema:
            type: string
        - name: 0x-version
          in: header
          description: API version
          required: true
          schema:
            type: string
      responses:
        '200':
          description: Successful response
          content:
            application/json:
              schema:
                $ref: >-
                  #/components/schemas/Gasless_getgaslessapprovaltokens_Response_200
        '400':
          description: 400 error response
          content:
            application/json:
              schema:
                $ref: >-
                  #/components/schemas/Gasless::getGaslessApprovalTokensRequestBadRequestError
        '500':
          description: 500 error response
          content:
            application/json:
              schema:
                $ref: >-
                  #/components/schemas/Gasless::getGaslessApprovalTokensRequestInternalServerError
servers:
  - url: https://api.0x.org
components:
  schemas:
    Gasless_getgaslessapprovaltokens_Response_200:
      type: object
      properties:
        tokens:
          type: array
          items:
            type: string
          description: The list of tokens that can be used for gasless approvals
        zid:
          type: string
          description: The unique ZeroEx identifier of the request
      required:
        - tokens
        - zid
      title: Gasless_getgaslessapprovaltokens_Response_200
    InputInvalidName:
      type: string
      enum:
        - INPUT_INVALID
      title: InputInvalidName
    InputInvalidDataDetailsItems:
      type: object
      properties:
        field:
          type: string
          description: The input field name
        reason:
          type: string
          description: The validation failure reason
      required:
        - field
        - reason
      title: InputInvalidDataDetailsItems
    InputInvalidData:
      type: object
      properties:
        zid:
          type: string
          description: The unique ZeroEx identifier of the request
        details:
          type: array
          items:
            $ref: '#/components/schemas/InputInvalidDataDetailsItems'
          description: The list of invalid inputs
      required:
        - zid
        - details
      title: InputInvalidData
    INPUT_INVALID:
      type: object
      properties:
        name:
          $ref: '#/components/schemas/InputInvalidName'
        message:
          type: string
        data:
          $ref: '#/components/schemas/InputInvalidData'
      required:
        - name
        - message
        - data
      title: INPUT_INVALID
    Gasless::getGaslessApprovalTokensRequestBadRequestError:
      oneOf:
        - $ref: '#/components/schemas/INPUT_INVALID'
      title: Gasless::getGaslessApprovalTokensRequestBadRequestError
    InternalServerErrorName:
      type: string
      enum:
        - INTERNAL_SERVER_ERROR
      title: InternalServerErrorName
    InternalServerErrorData:
      type: object
      properties:
        zid:
          type: string
          description: The unique ZeroEx identifier of the request
      required:
        - zid
      title: InternalServerErrorData
    INTERNAL_SERVER_ERROR:
      type: object
      properties:
        name:
          $ref: '#/components/schemas/InternalServerErrorName'
        message:
          type: string
        data:
          $ref: '#/components/schemas/InternalServerErrorData'
      required:
        - name
        - message
        - data
      title: INTERNAL_SERVER_ERROR
    UncategorizedName:
      type: string
      enum:
        - UNCATEGORIZED
      title: UncategorizedName
    UncategorizedData:
      type: object
      properties:
        zid:
          type: string
          description: The unique ZeroEx identifier of the request
      required:
        - zid
      title: UncategorizedData
    UNCATEGORIZED:
      type: object
      properties:
        name:
          $ref: '#/components/schemas/UncategorizedName'
        message:
          type: string
        data:
          $ref: '#/components/schemas/UncategorizedData'
      required:
        - name
        - message
        - data
      title: UNCATEGORIZED
    Gasless::getGaslessApprovalTokensRequestInternalServerError:
      oneOf:
        - $ref: '#/components/schemas/INTERNAL_SERVER_ERROR'
        - $ref: '#/components/schemas/UNCATEGORIZED'
      title: Gasless::getGaslessApprovalTokensRequestInternalServerError

```

## SDK Code Examples

```python
import requests

url = "https://api.0x.org/gasless/gasless-approval-tokens"

querystring = {"chainId":"8453"}

headers = {
    "0x-api-key": "0x-api-key",
    "0x-version": "v2"
}

response = requests.get(url, headers=headers, params=querystring)

print(response.json())
```

```javascript
const url = 'https://api.0x.org/gasless/gasless-approval-tokens?chainId=8453';
const options = {method: 'GET', headers: {'0x-api-key': '0x-api-key', '0x-version': 'v2'}};

try {
  const response = await fetch(url, options);
  const data = await response.json();
  console.log(data);
} catch (error) {
  console.error(error);
}
```

```go
package main

import (
	"fmt"
	"net/http"
	"io"
)

func main() {

	url := "https://api.0x.org/gasless/gasless-approval-tokens?chainId=8453"

	req, _ := http.NewRequest("GET", url, nil)

	req.Header.Add("0x-api-key", "0x-api-key")
	req.Header.Add("0x-version", "v2")

	res, _ := http.DefaultClient.Do(req)

	defer res.Body.Close()
	body, _ := io.ReadAll(res.Body)

	fmt.Println(res)
	fmt.Println(string(body))

}
```

```ruby
require 'uri'
require 'net/http'

url = URI("https://api.0x.org/gasless/gasless-approval-tokens?chainId=8453")

http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true

request = Net::HTTP::Get.new(url)
request["0x-api-key"] = '0x-api-key'
request["0x-version"] = 'v2'

response = http.request(request)
puts response.read_body
```

```java
import com.mashape.unirest.http.HttpResponse;
import com.mashape.unirest.http.Unirest;

HttpResponse<String> response = Unirest.get("https://api.0x.org/gasless/gasless-approval-tokens?chainId=8453")
  .header("0x-api-key", "0x-api-key")
  .header("0x-version", "v2")
  .asString();
```

```php
<?php
require_once('vendor/autoload.php');

$client = new \GuzzleHttp\Client();

$response = $client->request('GET', 'https://api.0x.org/gasless/gasless-approval-tokens?chainId=8453', [
  'headers' => [
    '0x-api-key' => '0x-api-key',
    '0x-version' => 'v2',
  ],
]);

echo $response->getBody();
```

```csharp
using RestSharp;

var client = new RestClient("https://api.0x.org/gasless/gasless-approval-tokens?chainId=8453");
var request = new RestRequest(Method.GET);
request.AddHeader("0x-api-key", "0x-api-key");
request.AddHeader("0x-version", "v2");
IRestResponse response = client.Execute(request);
```

```swift
import Foundation

let headers = [
  "0x-api-key": "0x-api-key",
  "0x-version": "v2"
]

let request = NSMutableURLRequest(url: NSURL(string: "https://api.0x.org/gasless/gasless-approval-tokens?chainId=8453")! as URL,
                                        cachePolicy: .useProtocolCachePolicy,
                                    timeoutInterval: 10.0)
request.httpMethod = "GET"
request.allHTTPHeaderFields = headers

let session = URLSession.shared
let dataTask = session.dataTask(with: request as URLRequest, completionHandler: { (data, response, error) -> Void in
  if (error != nil) {
    print(error as Any)
  } else {
    let httpResponse = response as? HTTPURLResponse
    print(httpResponse)
  }
})

dataTask.resume()
```