FunCaptcha

FunCaptcha is an interactive CAPTCHA developed by Arkose Labs. It presents users with visual puzzles such as rotating images, matching objects, or selecting the correct orientation. FunCaptcha is widely used by major platforms including Microsoft (Outlook, Xbox Live), EA, GitHub, and many others to protect login and registration flows.

Supported Types

Type	Proxy	Description
FunCaptchaTokenProxyLess	No	Standard (recommended)
FunCaptchaToken	Yes	With proxy

Parameters

Parameter	Type	Required	Description
type	string	Yes	Task type from the table above
websiteURL	string	Yes	URL of the page with the captcha
websiteKey	string	Yes	FunCaptcha public key
funcaptchaApiJSSubdomain	string	No	Custom API subdomain (e.g., client-api.arkoselabs.com)
data	string	No	Additional data blob parameter

Tip

The FunCaptcha public key can be found by searching the page source for public_key, pkey, or by inspecting network requests to arkoselabs.com. The funcaptchaApiJSSubdomain can be found in the script source URL (e.g., https://client-api.arkoselabs.com/fc/api/).

Proxy Parameters

Required when using the FunCaptchaToken proxy task type.

Parameter	Type	Required	Description
proxyType	string	Yes	http, socks4, or socks5
proxyAddress	string	Yes	Proxy IP or hostname
proxyPort	integer	Yes	Proxy port
proxyLogin	string	No	Proxy username
proxyPassword	string	No	Proxy password

Create Task

Request

{
  "clientKey": "YOUR_API_KEY",
  "task": {
    "type": "FunCaptchaTokenProxyLess",
    "websiteURL": "https://example.com/login",
    "websiteKey": "B7D8911C-5CC8-A9A3-35B0-554ACEE604DA",
    "funcaptchaApiJSSubdomain": "client-api.arkoselabs.com"
  }
}

Response

{
  "errorId": 0,
  "taskId": "abc-123-def"
}

Solution Object

{
  "token": "3085d1d21c56bcebcb09ce44db...."
}

Field	Type	Description
token	string	FunCaptcha session token

How to Use

The FunCaptcha token should be submitted as the callback token to the Arkose Labs verification endpoint. The exact integration method depends on the target site:

1. Hidden input field — Some sites store the token in a hidden form field (commonly named fc-token or similar). Set its value and submit the form.
2. JavaScript callback — Pass the token to the FunCaptcha enforcement callback function. This is typically done by calling the verification callback registered during the Arkose Labs SDK initialization.
3. API request — Include the token in the request body sent to the site’s verification endpoint.

Note

The data parameter (sometimes called data[blob]) is site-specific and may be required for certain implementations. Check the network requests on the target page for any data or blob values being sent to the Arkose Labs API.

Code Examples

Python

import requests
import time

API_KEY = "YOUR_API_KEY"

# Create task
response = requests.post("https://api.ucaptcha.net/createTask", json={
    "clientKey": API_KEY,
    "task": {
        "type": "FunCaptchaTokenProxyLess",
        "websiteURL": "https://example.com/login",
        "websiteKey": "B7D8911C-5CC8-A9A3-35B0-554ACEE604DA",
        "funcaptchaApiJSSubdomain": "client-api.arkoselabs.com"
    }
})
task_id = response.json()["taskId"]

# Poll for result
while True:
    result = requests.post("https://api.ucaptcha.net/getTaskResult", json={
        "clientKey": API_KEY,
        "taskId": task_id
    }).json()

    if result["status"] == "ready":
        token = result["solution"]["token"]
        print("Token:", token)
        break
    elif result["status"] == "failed":
        print("Error:", result.get("errorDescription"))
        break

    time.sleep(5)

JavaScript

const API_KEY = "YOUR_API_KEY";

const { taskId } = await fetch("https://api.ucaptcha.net/createTask", {
  method: "POST",
  headers: { "Content-Type": "application/json" },
  body: JSON.stringify({
    clientKey: API_KEY,
    task: {
      type: "FunCaptchaTokenProxyLess",
      websiteURL: "https://example.com/login",
      websiteKey: "B7D8911C-5CC8-A9A3-35B0-554ACEE604DA",
      funcaptchaApiJSSubdomain: "client-api.arkoselabs.com"
    }
  })
}).then(r => r.json());

while (true) {
  const result = await fetch("https://api.ucaptcha.net/getTaskResult", {
    method: "POST",
    headers: { "Content-Type": "application/json" },
    body: JSON.stringify({ clientKey: API_KEY, taskId })
  }).then(r => r.json());

  if (result.status === "ready") {
    console.log("Token:", result.solution.token);
    break;
  } else if (result.status === "failed") {
    console.error("Error:", result.errorDescription);
    break;
  }

  await new Promise(r => setTimeout(r, 5000));
}

cURL

# Create task
curl -X POST https://api.ucaptcha.net/createTask \
  -H "Content-Type: application/json" \
  -d '{
    "clientKey": "YOUR_API_KEY",
    "task": {
      "type": "FunCaptchaTokenProxyLess",
      "websiteURL": "https://example.com/login",
      "websiteKey": "B7D8911C-5CC8-A9A3-35B0-554ACEE604DA",
      "funcaptchaApiJSSubdomain": "client-api.arkoselabs.com"
    }
  }'

# Poll for result (replace TASK_ID with the taskId from above)
curl -X POST https://api.ucaptcha.net/getTaskResult \
  -H "Content-Type: application/json" \
  -d '{
    "clientKey": "YOUR_API_KEY",
    "taskId": "TASK_ID"
  }'

Provider Coverage

• 2Captcha
• Anti-Captcha
• CapMonster
• DeathByCaptcha
• RiskByPass

Aliases

The following legacy type names are also accepted for backward compatibility:

• FunCaptchaTask
• FunCaptchaTaskProxyless