> Fetch clean Markdown by appending `.md` to any page URL under https://signalwire.com/docs or requesting it with the HTTP header `Accept: text/markdown`. The root index at https://signalwire.com/docs/llms.txt lists the available documentation indexes.

# List Relay applications

GET https://%7BYour_Space_Name%7D.signalwire.com/api/fabric/resources/relay_applications

Returns the project's Relay Application resources, which route calls or messages to a Relay Server SDK application listening on a topic. Use it to discover topic-backed handlers before retrieving or changing one. Use a [SWML Webhook](/docs/apis/rest/swml-webhook/list-swml-webhooks) for an HTTP server that returns instructions per request, or a [Call Flow](/docs/apis/rest/call-flows/list-call-flows) for a visual handler.

#### Permissions

The API token used to authenticate must have the following scope(s) enabled to make a successful request: _Voice_, _Messaging_, _Fax_, or _Video_.

[Learn more about API scopes](/docs/platform/your-signalwire-api-space).

Reference: https://signalwire.com/docs/apis/rest/relay-application/list-relay-applications

## Authentication

- `Authorization` header (basic auth, required) — SignalWire Basic Authentication using Project ID and API Token. The client sends HTTP requests with the Authorization header containing the word Basic followed by a space and a base64-encoded string of project_id:token. The project ID will be used as the username and the API token as the password. Example: ``` Authorization: Basic base64(project_id:token) ```

## Response

### 200

The request has succeeded.

- `data` (list of RelayApplicationResponse, required) — An array of objects that contain a list of Relay Application data
- `links` (RelayApplicationAddressPaginationResponse, required) — Object containing pagination links

## Errors

### 401 Unauthorized Error

Access is unauthorized.

- `error` (enum, required)
  - Allowed values: `Unauthorized`

### 404 Not Found Error

The server cannot find the requested resource.

- `error` (enum, required)
  - Allowed values: `Not Found`

### 500 Internal Server Error

An internal server error occurred.

- `error` (enum, required)
  - Allowed values: `Internal Server Error`

## Types

### RelayApplicationResponse

- `id` (string, required) — Unique ID of the Relay Application.
- `project_id` (string, required) — Unique ID of the Project.
- `display_name` (string, required) — Display name of the Relay Application Fabric Resource
- `type` (enum, required) — Type of the Fabric Resource
  - Allowed values: `relay_application`
- `created_at` (datetime, required) — Date and time when the resource was created.
- `updated_at` (datetime, required) — Date and time when the resource was updated.
- `relay_application` (RelayApplication, required) — Relay Application data.

### RelayApplicationAddressPaginationResponse

- `self` (string, required) — Self link for the current page
- `first` (string, required) — Link to the first page
- `next` (string, optional) — Link to the next page
- `prev` (string, optional) — Link to the previous page

### RelayApplication

- `id` (string, required) — Unique ID of a Relay Application.
- `name` (string, required) — Name of the Relay Application
- `topic` (string, required) — Topic of the Relay Application
- `call_status_callback_url` (string, required, nullable) — Call status callback URL

## Examples

**Response**

```json
{
  "data": [
    {
      "id": "993ed018-9e79-4e50-b97b-984bd5534095",
      "project_id": "1313fe58-5e14-4c11-bbe7-6fdfa11fe780",
      "display_name": "Customer Service Bot",
      "type": "relay_application",
      "created_at": "2024-05-06T12:20:00Z",
      "updated_at": "2024-05-06T12:20:00Z",
      "relay_application": {
        "id": "3fa85f64-5717-4562-b3fc-2c963f66afa6",
        "name": "Booking Assistant",
        "topic": "booking",
        "call_status_callback_url": "https://example.com/callbacks"
      }
    }
  ],
  "links": {
    "self": "https://example.signalwire.com/api/fabric/resources/relay_applications/a87db7ed-8ebe-42e4-829f-8ba5a4152f54/addresses?page_number=0&page_size=50&type=relay_application",
    "first": "https://example.signalwire.com/api/fabric/resources/relay_applications/a87db7ed-8ebe-42e4-829f-8ba5a4152f54/addresses?page_number=0&page_size=50&type=relay_application",
    "next": "https://example.signalwire.com/api/fabric/resources/relay_applications/a87db7ed-8ebe-42e4-829f-8ba5a4152f54/addresses?page_number=1&page_size=50&page_token=PAbff61159-faab-48b3-959a-3021a8f5beca&type=relay_application",
    "prev": "https://example.signalwire.com/api/fabric/resources/relay_applications/a87db7ed-8ebe-42e4-829f-8ba5a4152f54/addresses?page_number=0&page_size=50&page_token=PAbff61159-faab-48b3-959a-3021a8f5beca&type=relay_application"
  }
}
```

**SDK Code**

```python
import requests

url = "https://{your_space_name}.signalwire.com/api/fabric/resources/relay_applications"

response = requests.get(url, auth=("<project_id>", "<api_token>"))

print(response.json())
```

```javascript
const url = 'https://{your_space_name}.signalwire.com/api/fabric/resources/relay_applications';
const credentials = btoa("<project_id>:<api_token>");

const options = {method: 'GET', headers: {Authorization: `Basic ${credentials}`}};

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://{your_space_name}.signalwire.com/api/fabric/resources/relay_applications"

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

	req.SetBasicAuth("<project_id>", "<api_token>")

	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://{your_space_name}.signalwire.com/api/fabric/resources/relay_applications")

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

request = Net::HTTP::Get.new(url)
request.basic_auth("<project_id>", "<api_token>")

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://{your_space_name}.signalwire.com/api/fabric/resources/relay_applications")
  .basicAuth("<project_id>", "<api_token>")
  .asString();
```

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

$client = new \GuzzleHttp\Client();

$response = $client->request('GET', 'https://{your_space_name}.signalwire.com/api/fabric/resources/relay_applications', [
  'headers' => [
  ],
    'auth' => ['<project_id>', '<api_token>'],
]);

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

```csharp
using RestSharp;
using RestSharp.Authenticators;

var client = new RestClient("https://{your_space_name}.signalwire.com/api/fabric/resources/relay_applications");
client.Authenticator = new HttpBasicAuthenticator("<project_id>", "<api_token>");
var request = new RestRequest(Method.GET);

IRestResponse response = client.Execute(request);
```

```swift
import Foundation

let credentials = Data("<project_id>:<api_token>".utf8).base64EncodedString()

let headers = ["Authorization": "Basic \(credentials)"]

let request = NSMutableURLRequest(url: NSURL(string: "https://{your_space_name}.signalwire.com/api/fabric/resources/relay_applications")! 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()
```