Getting CAPTCHA parameters in the Firefox extension

The CapMonster Cloud extension displays the parameters of the CAPTCHA detected on the page. You can use this data as a template when creating the task object for submitting a task through the CapMonster Cloud API.

Important

This feature is intended only to demonstrate the request format. Do not copy all parameter values from the extension, as some of them may change each time the CAPTCHA page is loaded. Before submitting a task, make sure you use the current parameter values (for details on how to obtain all required parameters, see the documentation for the corresponding CAPTCHA type).

How to view CAPTCHA parameters

Before you begin, make sure that:

• the CapMonster Cloud extension is installed and enabled;
• a valid API key is specified in the extension settings;
• your account has a sufficient balance;
• the required CAPTCHA type is enabled for automatic solving.

To view the parameters:

1. Open the page containing the CAPTCHA.

2. Open Developer Tools.

3. Go to the CapMonster Cloud tab:

   

4. Reload the page.

The detected CAPTCHA parameters will be displayed automatically. If no data is displayed, complete the CAPTCHA manually — after a successful verification, the parameters will become available.

To copy the parameters, click the copy icon next to the detected CAPTCHA name.

info

The tab displays the contents of the task object that the extension sends to CapMonster Cloud.

If you are submitting requests through the API manually, place this data into the task field and add your clientKey.

Example of a complete request for the selected CAPTCHA type (in this case, reCAPTCHA v2 solved using the Click method):

{
  "clientKey": "API_KEY",
  "task": {
    "class": "recaptcha",
    "imageUrls": ["IMAGE_URL"],
    "metadata": {
      "Task": "Select all squares with motorcycles",
      "Grid": "3x3"
    },
    "recognizingThreshold": 60,
    "userAgent": "userAgentPlaceholder",
    "type": "ComplexImageTask"
  }
}

Important

For API requests, use the current userAgent supported by CapMonster Cloud.

You can always get the latest value at: https://capmonster.cloud/api/useragent/actual

Supported CAPTCHA types and parameters

CAPTCHA type	Displayed parameters
reCAPTCHA V2 (Click)	class, imageUrls, Task inside metadata, Grid inside metadata, recognizingThreshold, userAgent, type
reCAPTCHA V2 (Token)	websiteURL, websiteKey, userAgent, type
reCAPTCHA V2 Invisible	class, imageUrls, Task inside metadata, Grid inside metadata, recognizingThreshold, userAgent, type
reCAPTCHA V2 Enterprise (Click)	class, imageUrls, Task inside metadata, Grid inside metadata, recognizingThreshold, userAgent, type
reCAPTCHA V2 Enterprise (Token)	websiteURL, websiteKey, userAgent, recaptchaDataSValue, type
reCAPTCHA V3	websiteURL, websiteKey, pageAction, minScore, type
GeeTest v3	websiteURL, gt, challenge, userAgent, type
GeeTest v4	websiteURL, gt (captcha_id), userAgent, version, type
Cloudflare Turnstile	websiteURL, websiteKey, userAgent, type
Cloudflare Challenge	websiteURL, websiteKey, userAgent, pageAction, data, pageData, cloudflareTaskType, type
ImageToText	body in base64 format, type
BLS	class, imagesBase64, Task inside metadata, TaskArgument inside metadata, type
Binance	websiteURL, websiteKey, validateId, userAgent, type

The displayed parameters depend on the CAPTCHA type and its implementation on the target website.