FunCaptcha

Solves Arkose Labs FunCaptcha, including rotate, match and pick-the-image puzzles. Costs $1.00 per 1,000 tokens.

Task object

Send this as task in createTask.

FunCaptchaTask fields
Field	Type	Description
`type` Required	`string`	Always FunCaptchaTask.
`websiteURL` Required	`string`	The full URL of the page where the captcha appears.
`websitePublicKey` Required	`string`	The Arkose public key for the site. See below for how to find it.
`funcaptchaApiJSSubdomain` Optional	`string`	The host the site loads Arkose from, if it is not client-api.arkoselabs.com.
`data` Optional	`string`	Extra data the site passes to Arkose, as a JSON string. Usually a blob value.
`proxy` Recommended	`string`	The proxy your session uses, so the token is issued for the same IP.
`userAgent` Optional	`string`	The user agent your session uses. Send it when you send a proxy.

JSON

{
  "clientKey": "YOUR_API_KEY",
  "task": {
    "type": "FunCaptchaTask",
    "websiteURL": "https://example.com/signup",
    "websitePublicKey": "476068BF-9607-4799-B53D-966BE98E2B81",
    "funcaptchaApiJSSubdomain": "client-api.arkoselabs.com",
    "data": "{\"blob\":\"HERE_IS_THE_BLOB\"}",
    "proxy": "http://user:[email protected]:8080",
    "userAgent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) ..."
  }
}

Finding the public key

Open the page with your browser's developer tools and look for one of these:

A data-pkey attribute on the element that holds the captcha.
A network request to /fc/gt2/public_key/<KEY> or /v2/<KEY>/api.js. The key is the part in angle brackets.
A pk= parameter in the captcha iframe's URL.

If those requests go to a host other than client-api.arkoselabs.com, send that host as funcaptchaApiJSSubdomain.

Blob data

Some sites pass a one-time blob to Arkose. It appears in the same network requests, often as data[blob]. Fetch a fresh blob for every task and send it as {"blob":"..."} in data. A reused blob produces a token the site will reject.

Solution

FunCaptcha solution fields
Field	Type	Description
`token` Required	`string`	The Arkose session token. Submit it where the site expects fc-token or verification-token.

JSON

{
  "errorId": 0,
  "status": "ready",
  "solution": {
    "token": "3017b7b5a0c23c1f2.1234567805|r=us-east-1|meta=3|..."
  }
}

Tokens are tied to the IP and user agent they were solved with. Send the same proxy and user agent you'll submit the token from.