> For clean Markdown of any page, append .md to the page URL.
> For a complete documentation index, see https://docs.freecustom.email/free-custom-email-api/v-1/domains/list-available-platform-domains/llms.txt.
> For AI client integration (Claude Code, Cursor, etc.), connect to the MCP server at https://docs.freecustom.email/_mcp/server.

# List available platform domains

GET https://api2.freecustom.email/v1/domains

Returns the **platform-managed** domains available for inbox creation,
filtered by your plan:

- **Free / Developer / Startup** — free-tier domains only.
- **Growth / Enterprise** — free-tier + pro-tier domains.

Results are cached for up to 5 minutes. New domains appear automatically
without requiring a code change on your side.

Tags on each domain:
- `new` — recently added domain, shown for ~30 days.
- `popular` — high-traffic domain.

Domains expiring within 30 days include `expires_at` and
`expires_in_days` as a heads-up to migrate inboxes. Healthy domains
omit these fields entirely to keep the payload lean.

> **Custom domains** (domains you own and verified) are managed via
> `GET /v1/custom-domains` — this endpoint only returns platform domains.


Reference: https://docs.freecustom.email/free-custom-email-api/v-1/domains/list-available-platform-domains

## Authentication

- `Authorization` header (bearer token, required) — Bearer authentication of the form `Bearer <token>`, where token is your auth token.

## Response

### 200

OK

- `success` (boolean, required)
- `count` (integer, required)
- `note` (string, required)
- `data` (list of V1DomainsGetResponsesContentApplicationJsonSchemaDataItems, required)

## Errors

### 401 Unauthorized Error

Unauthorized

- `success` (boolean, required)
- `error` (string, required)
- `message` (string, required)

### 429 Too Many Requests Error

Too Many Requests

- `success` (boolean, required)
- `error` (string, required)
- `message` (string, required)
- `upgrade_url` (string, required)
- `credits_url` (string, required)
- `hint` (string, required)

## Types

### V1DomainsGetResponsesContentApplicationJsonSchemaDataItems

- `domain` (string, required)
- `tier` (string, required)
- `tags` (list of string, required)

## Examples

**Response**

```json
{
  "success": true,
  "count": 10,
  "note": "Upgrade to Growth plan to access additional pro domains.",
  "data": [
    {
      "domain": "ditube.info",
      "tier": "free",
      "tags": [
        "popular"
      ]
    },
    {
      "domain": "ditplay.info",
      "tier": "free",
      "tags": [
        "popular"
      ]
    },
    {
      "domain": "ditapi.info",
      "tier": "free",
      "tags": []
    },
    {
      "domain": "getnotify.io",
      "tier": "free",
      "tags": [
        "new"
      ],
      "expires_at": "2026-04-01",
      "expires_in_days": 25,
      "expiring_soon": true
    }
  ]
}
```

**SDK Code**

```python v1_domains_List available platform domains_example
import requests

url = "https://api2.freecustom.email/v1/domains"

headers = {"Authorization": "Bearer <token>"}

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

print(response.json())
```

```javascript v1_domains_List available platform domains_example
const url = 'https://api2.freecustom.email/v1/domains';
const options = {method: 'GET', headers: {Authorization: 'Bearer <token>'}};

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

```go v1_domains_List available platform domains_example
package main

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

func main() {

	url := "https://api2.freecustom.email/v1/domains"

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

	req.Header.Add("Authorization", "Bearer <token>")

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

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

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

}
```

```ruby v1_domains_List available platform domains_example
require 'uri'
require 'net/http'

url = URI("https://api2.freecustom.email/v1/domains")

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

request = Net::HTTP::Get.new(url)
request["Authorization"] = 'Bearer <token>'

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

```java v1_domains_List available platform domains_example
import com.mashape.unirest.http.HttpResponse;
import com.mashape.unirest.http.Unirest;

HttpResponse<String> response = Unirest.get("https://api2.freecustom.email/v1/domains")
  .header("Authorization", "Bearer <token>")
  .asString();
```

```php v1_domains_List available platform domains_example
<?php
require_once('vendor/autoload.php');

$client = new \GuzzleHttp\Client();

$response = $client->request('GET', 'https://api2.freecustom.email/v1/domains', [
  'headers' => [
    'Authorization' => 'Bearer <token>',
  ],
]);

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

```csharp v1_domains_List available platform domains_example
using RestSharp;

var client = new RestClient("https://api2.freecustom.email/v1/domains");
var request = new RestRequest(Method.GET);
request.AddHeader("Authorization", "Bearer <token>");
IRestResponse response = client.Execute(request);
```

```swift v1_domains_List available platform domains_example
import Foundation

let headers = ["Authorization": "Bearer <token>"]

let request = NSMutableURLRequest(url: NSURL(string: "https://api2.freecustom.email/v1/domains")! 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()
```