> For clean Markdown of any page, append .md to the page URL.
> For a complete documentation index, see https://docs.agentphone.ai/api-reference/calls/create-web-call-v-1-calls-web-post/llms.txt.
> For AI client integration (Claude Code, Cursor, etc.), connect to the MCP server at https://docs.agentphone.ai/_mcp/server.

# Create Web Call

POST https://api.agentphone.ai/v1/calls/web
Content-Type: application/json

Create a browser-based web call.

Returns an access token that your frontend passes to the AgentPhone Web SDK
(`agentphone-web-sdk`) to start the call in the browser. The token
expires 30 seconds after creation.

Flow:

1. Validates the agent belongs to your account
2. Creates a web call and returns an access token
3. Your client calls `webClient.startCall({ accessToken })` to connect
4. Call lifecycle (transcripts, webhooks) works the same as phone calls

Reference: https://docs.agentphone.ai/api-reference/calls/create-web-call-v-1-calls-web-post

## Authentication

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

## Request

### Body (application/json)

This endpoint expects a CreateWebCallRequest.

- `agentId` (string, required) — Agent ID to start the web call with
- `metadata` (CreateWebCallRequestMetadata, optional, nullable) — Optional metadata to attach to the call
- `variables` (map from string to string, optional, nullable) — Optional per-call dynamic variables. Values are substituted into `{{var_name}}` placeholders in the agent's system prompt and begin message at call time. Requires a hosted-mode agent.

## Response

### 200

Successful Response

- `any`

## Errors

### 422 Unprocessable Entity Error

Validation Error

- `detail` (list of ValidationError, optional)

## Types

### CreateWebCallRequestMetadata

Optional metadata to attach to the call

### ValidationError

- `loc` (list of ValidationErrorLocItems, required)
- `msg` (string, required)
- `type` (string, required)

### ValidationErrorLocItems

## Examples

**Request**

```json
{
  "agentId": "agent_9f8b7c6d5e4a3b2c1d0e"
}
```

**Response**

```json
{
  "accessToken": "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJhZ2VudElkIjoiYWdlbnRfOWY4YjdjNmQ1ZTRhM2IyYzFkMGUiLCJleHAiOjE2ODU0MjQ4MDB9.XYZ123abc456def789ghi012jkl345mno678pqr"
}
```

**SDK Code**

```python
import requests

url = "https://api.agentphone.ai/v1/calls/web"

payload = { "agentId": "agent_9f8b7c6d5e4a3b2c1d0e" }
headers = {
    "Authorization": "Bearer <token>",
    "Content-Type": "application/json"
}

response = requests.post(url, json=payload, headers=headers)

print(response.json())
```

```javascript
const url = 'https://api.agentphone.ai/v1/calls/web';
const options = {
  method: 'POST',
  headers: {Authorization: 'Bearer <token>', 'Content-Type': 'application/json'},
  body: '{"agentId":"agent_9f8b7c6d5e4a3b2c1d0e"}'
};

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"
	"strings"
	"net/http"
	"io"
)

func main() {

	url := "https://api.agentphone.ai/v1/calls/web"

	payload := strings.NewReader("{\n  \"agentId\": \"agent_9f8b7c6d5e4a3b2c1d0e\"\n}")

	req, _ := http.NewRequest("POST", url, payload)

	req.Header.Add("Authorization", "Bearer <token>")
	req.Header.Add("Content-Type", "application/json")

	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.agentphone.ai/v1/calls/web")

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

request = Net::HTTP::Post.new(url)
request["Authorization"] = 'Bearer <token>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"agentId\": \"agent_9f8b7c6d5e4a3b2c1d0e\"\n}"

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.post("https://api.agentphone.ai/v1/calls/web")
  .header("Authorization", "Bearer <token>")
  .header("Content-Type", "application/json")
  .body("{\n  \"agentId\": \"agent_9f8b7c6d5e4a3b2c1d0e\"\n}")
  .asString();
```

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

$client = new \GuzzleHttp\Client();

$response = $client->request('POST', 'https://api.agentphone.ai/v1/calls/web', [
  'body' => '{
  "agentId": "agent_9f8b7c6d5e4a3b2c1d0e"
}',
  'headers' => [
    'Authorization' => 'Bearer <token>',
    'Content-Type' => 'application/json',
  ],
]);

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

```csharp
using RestSharp;

var client = new RestClient("https://api.agentphone.ai/v1/calls/web");
var request = new RestRequest(Method.POST);
request.AddHeader("Authorization", "Bearer <token>");
request.AddHeader("Content-Type", "application/json");
request.AddParameter("application/json", "{\n  \"agentId\": \"agent_9f8b7c6d5e4a3b2c1d0e\"\n}", ParameterType.RequestBody);
IRestResponse response = client.Execute(request);
```

```swift
import Foundation

let headers = [
  "Authorization": "Bearer <token>",
  "Content-Type": "application/json"
]
let parameters = ["agentId": "agent_9f8b7c6d5e4a3b2c1d0e"] as [String : Any]

let postData = JSONSerialization.data(withJSONObject: parameters, options: [])

let request = NSMutableURLRequest(url: NSURL(string: "https://api.agentphone.ai/v1/calls/web")! as URL,
                                        cachePolicy: .useProtocolCachePolicy,
                                    timeoutInterval: 10.0)
request.httpMethod = "POST"
request.allHTTPHeaderFields = headers
request.httpBody = postData as Data

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()
```