Hybrid AI + Human CAPTCHA Solving

Geetest v4 Solver API

Integrate a scalable Geetest v4 solving platform powered by hybrid OCR technology, human solvers, image-alignment token generation, captcha_id-based requests, proxy integration, multi-language SDKs, and enterprise-ready infrastructure.


API Infrastructure
Online
Solve Time 16´s
Availability 24/7
Accuracy Rate 99%
Price $2.89/1k
/**
* Death by Captcha PHP API geetest v4 usage example
*
* @package DBCAPI
* @subpackage PHP
*/

require_once 'deathbycaptcha.php';

$username = "username";  // DBC account username
$password = "password";  // DBC account password
$token_from_panel = "your-token-from-panel";  // DBC account authtoken

// Use DeathByCaptcha_SocketClient() class if you want to use SOCKET API.
$client = new DeathByCaptcha_HttpClient($username, $password);
$client->is_verbose = true;

// To use token the first parameter must be authtoken.
// $client = new DeathByCaptcha_HttpClient("authtoken", $token_from_panel);

echo "Your balance is {$client->balance} US cents\\n";

// Set the proxy and geetest v4 token data
$data = array(
    'proxy' => 'http://user:[email protected]:1234',
    'proxytype' => 'HTTP',
    'captcha_id' => 'fcd636b4514bf7ac4143922550b3008b',
    'pageurl' => 'https://testsite.com/xxx-test'
);
//Create a json string
$json = json_encode($data);

//Put the type and the json payload
$extra = [
    'type' => 9,
    'geetest_params' => $json,
];

// Put null the first parameter and add the extra payload
if ($captcha = $client->decode(null, $extra)) {
    echo "CAPTCHA {$captcha['captcha']} uploaded\\n";

    sleep(DeathByCaptcha_Client::DEFAULT_TIMEOUT);

    // Poll for CAPTCHA indexes:
    if ($text = $client->get_text($captcha['captcha'])) {
        echo "CAPTCHA {$captcha['captcha']} solved: ".json_encode($text)."\\n";

        // // To access the response by item
        // echo "captcha_id: {$text['captcha_id']}\n";
        // echo "lot_number: {$text['lot_number']}\n";
        // echo "pass_token: {$text['pass_token']}\n";
        // echo "gen_time: {$text['gen_time']}\n";
        // echo "captcha_output: {$text['captcha_output']}\n";

        // Report an incorrectly solved CAPTCHA.
        // Make sure the CAPTCHA was in fact incorrectly solved!
        //$client->report($captcha['captcha']);
    }
}
# geetest v4
import deathbycaptcha
import json

# Put your DBC account username and password here.
username = "username"
password = "password"

# you can use authtoken instead of user/password combination
# activate and get the authtoken from DBC users panel
authtoken = "authtoken"

# to use socket client
# client = deathbycaptcha.SocketClient(username, password)

# to use authtoken
# client = deathbycaptcha.SocketClient(username, password, authtoken)

client = deathbycaptcha.HttpClient(username, password)

# Put the proxy and Geetest v4 token data
Captcha_dict = {
    'proxy': 'http://user:[email protected]:1234',
    'proxytype': 'HTTP',
    'captcha_id': 'fcd636b4514bf7ac4143922550b3008b',
    'pageurl': 'https://testsite.com/xxx-test'}

# Create a json string
json_Captcha = json.dumps(Captcha_dict)

try:
    balance = client.get_balance()
    print(balance)

    # Put your CAPTCHA type and Json payload here:
    captcha = client.decode(type=9, geetest_params=json_Captcha)
    if captcha:
        # The CAPTCHA was solved; captcha["captcha"] item holds its
        # numeric ID, and captcha["text"] item its response.
        print("CAPTCHA %s solved: %s" % (captcha["captcha"], captcha["text"]))

        # # To access the response by item
        # print ("captcha_id:", captcha["text"]["captcha_id"])
        # print ("lot_number:", captcha["text"]["lot_number"])
        # print ("pass_token:", captcha["text"]["pass_token"])
        # print ("gen_time:", captcha["text"]["gen_time"])
        # print ("captcha_output:", captcha["text"]["captcha_output"])

        if '':  # check if the CAPTCHA was incorrectly solved
            client.report(captcha["captcha"])

except deathbycaptcha.AccessDeniedException:
    # Access to DBC API denied, check your credentials and/or balance
    print("error: Access to DBC API denied, check your credentials and/or balance")
package examples;

import com.DeathByCaptcha.AccessDeniedException;
import com.DeathByCaptcha.Client;
import com.DeathByCaptcha.HttpClient;
import com.DeathByCaptcha.SocketClient;
import com.DeathByCaptcha.Captcha;
import org.json.JSONObject;

import java.io.IOException;

class ExampleGeetestV4 {
    public static void main(String[] args)
            throws Exception {

        // Put your DBC username & password or authtoken here:
        String username = "your_username_here";
        String password = "your_password_here";
        String authtoken = "your_authtoken_here";

        //Death By Captcha Socket Client
        Client client = (Client) (new SocketClient(username, password));
        //Death By Captcha http Client
        // Client client = (Client) (new HttpClient(username, password));
        client.isVerbose = true;

        /* Using authtoken
           Client client = (Client) new HttpClient(authtoken); */

        try {
            try {
                System.out.println("Your balance is " + client.getBalance()
                                                    + " US cents");
            } catch (IOException e) {
                System.out.println("Failed fetching balance: " + e.toString());
                return;
            }

            Captcha captcha = null;
            try {
                // Proxy and geetest v4 data
                String proxy = "";
                String proxytype = "";
                String captcha_id = "fcd636b4514bf7ac4143922550b3008b";
                String pageurl = "https://testsite.com/xxx-test";

                /* Upload a geetest v4 and poll for its status with 120 seconds timeout.
                   Put your proxy, proxy type, captcha_id, page url and solving
                   timeout (in seconds) 0 or nothing for the default timeout value. */

                JSONObject json_params = new JSONObject();
                json_params.put("proxy", proxy);
                json_params.put("proxytype", proxytype);
                json_params.put("captcha_id", captcha_id);
                json_params.put("pageurl", pageurl);

                captcha = client.decode(9, json_params);

            } catch (IOException e) {
                System.out.println("Failed uploading CAPTCHA");
                return;
            }
            if (null != captcha) {
                System.out.println("CAPTCHA " + captcha.id + " solved: "
                                                        + captcha.text);

                // // To access the response by item
                // JSONObject text = new JSONObject(captcha.text);
                // System.out.println("captcha_id: " + text.get("captcha_id"));
                // System.out.println("lot_number: " + text.get("lot_number"));
                // System.out.println("pass_token: " + text.get("pass_token"));
                // System.out.println("gen_time: " + text.get("gen_time"));
                // System.out.println("captcha_output: " + text.get("captcha_output"));

                /* Report incorrectly solved CAPTCHA if necessary.
                   Make sure you've checked if the CAPTCHA was in fact incorrectly
                   solved, or else you might get banned as abuser. */
                /*try {
                    if (client.report(captcha)) {
                        System.out.println("Reported as incorrectly solved");
                    } else {
                        System.out.println("Failed reporting incorrectly solved CAPTCHA");
                    }
                } catch (IOException e) {
                    System.out.println("Failed reporting incorrectly solved CAPTCHA: " + e.toString());
                }*/
            } else {
                System.out.println("Failed solving CAPTCHA");
            }
        } catch (com.DeathByCaptcha.Exception e) {
            System.out.println(e);
        }
    }
}
// geetest v4

using System;
using System.Collections;
using DeathByCaptcha;

namespace DeathByCaptcha
{
    public class GeetestV4Example
    {
        static public void Main(string[] argv)
        {
            // Put your DeathByCaptcha account username and password here.
            string username = "username";
            string password = "password";
            // string token_from_panel = "your-token-from-panel";

            /* Death By Captcha Socket Client
               Client client = (Client) new SocketClient(username, password);
               Death By Captcha http Client */
            Client client = (Client) new HttpClient(username, password);

            /* To use token authentication the first parameter must be "authtoken".
            Client client = (Client) new HttpClient("authtoken", token_from_panel); */

            // Put your Proxy credentials and type here
            // string proxy = "http://user:[email protected]:1234";
            // string proxyType = "HTTP";
            string proxy = "";
            string proxyType = "";
            string captcha_id = "fcd636b4514bf7ac4143922550b3008b";
            string pageurl = "https://testsite.com/xxx-test";

            string geetestParams = "{\"proxy\": \"" + proxy + "\"," +
                                    "\"proxytype\": \"" + proxyType + "\"," +
                                    "\"captcha_id\": \"" + captcha_id + "\"," +
                                    "\"pageurl\": \"" + pageurl + "\"}";

            try
            {
                double balance = client.GetBalance();

                /* Upload a CAPTCHA and poll for its status.  Put the geetest
                   Json payload, CAPTCHA type and desired solving timeout (in seconds)
                   here. If solved, you'll receive a DeathByCaptcha.Captcha object. */
                Captcha captcha = client.Decode(Client.DefaultTimeout,
                    new Hashtable()
                    {
                        {"type", 9},
                        {"geetest_params", geetestParams}
                    });

                if (null != captcha)
                {
                    /* The CAPTCHA was solved; captcha.Id property holds
                    its numeric ID, and captcha.Text holds its text. */
                    Console.WriteLine("CAPTCHA {0} solved: {1}", captcha.Id,
                        captcha.Text);

                    // // To access the response by item
                    // Hashtable text = (Hashtable) SimpleJson.Reader.Read(captcha.Text);
                    // Console.WriteLine("captcha_id: {0}", text["captcha_id"]);
                    // Console.WriteLine("lot_number: {0}", text["lot_number"]);
                    // Console.WriteLine("pass_token: {0}", text["pass_token"]);
                    // Console.WriteLine("gen_time: {0}", text["gen_time"]);
                    // Console.WriteLine("captcha_output: {0}", text["captcha_output"]);

    //                  if ( /* check if the CAPTCHA was incorrectly solved */)
    //                  {
    //                      client.Report(captcha);
    //                  }
                }
            }
            catch (AccessDeniedException e)
            {
                /* Access to DBC API denied,
                            check your credentials and/or balance */
                Console.WriteLine("<<< catch : " + e.ToString());
            }
        }
    }
}
Imports System
Imports System.Threading
Imports System.Collections

Imports DeathByCaptcha

Public Class GeetestV4
    Public Shared Sub Main(ByVal args As String())

        ' Put your DBC username & password or authtoken here:
        Dim username = "username"
        Dim password = "password"
        Dim token_from_panel = "your-token-from-panel"

        ' DBC Socket API client
        ' Dim client As New SocketClient(username, password)
        ' DBC HTTP API client
        Dim client As New HttpClient(username, password)

        ' To use token auth the first parameter must be "authtoken"
        ' Dim client As New HttpClient("authtoken", token_from_panel)

        ' Proxy and geetest v4 data
        Dim proxy = "http://user:[email protected]:1234"
        Dim proxyType = "HTTP"
        Dim captcha_id = "fcd636b4514bf7ac4143922550b3008b"
        Dim pageurl = "https://testsite.com/xxx-test"

        Console.WriteLine(String.Format("Your balance is {0,2:f} US cents",
                                        client.Balance))

        ' Create a JSON with the extra data
        Dim geetestParams = "{""proxy"": """ + proxy + """," & _
                            """proxytype"": """ + proxyType + """," & _
                            """captcha_id"": """ + captcha_id + """," & _
                            """pageurl"": """ + pageurl + """}"

        ' Create the payload with the type and the extra data
        Dim extraData As New Hashtable()
        extraData.Add("type", 9)
        extraData.Add("geetest_params", geetestParams)

        ' Upload a CAPTCHA and poll for its status.  Put the geetest
        ' Json payload, CAPTCHA type and desired solving timeout (in seconds)
        ' here. If solved, you'll receive a DeathByCaptcha.Captcha object.
        Dim captcha As Captcha = client.Decode(DeathByCaptcha.Client.DefaultTimeout, extraData)
        If captcha IsNot Nothing Then
            Console.WriteLine(String.Format("CAPTCHA {0:d} solved: {1}", captcha.Id,
                                            captcha.Text))

            ' Report an incorrectly solved CAPTCHA.
            ' Make sure the CAPTCHA was in fact incorrectly solved, do not
            ' just report it at random, or you might be banned as abuser.
            ' If client.Report(captcha) Then
            '    Console.WriteLine("Reported as incorrectly solved")
            ' Else
            '    Console.WriteLine("Failed reporting as incorrectly solved")
            ' End If
        End If
    End Sub
End Class
/*
* Death by Captcha Node.js API geetest v4 usage example
*/

const dbc = require('deathbycaptcha');

const username = 'username';     // DBC account username
const password = 'password';     // DBC account password
const token_from_panel = 'your-token-from-panel';   // DBC account authtoken

// Proxy and geetest v4 token data
const geetest_params = JSON.stringify({
    'proxy': 'http://username:[email protected]:3128',
    'proxytype': 'HTTP',
    'captcha_id': 'fcd636b4514bf7ac4143922550b3008b',
    'pageurl': 'https://testsite.com/xxx-test'
});

// Death By Captcha Socket Client
// const client = new dbc.SocketClient(username, password);
// Death By Captcha http Client
const client = new dbc.HttpClient(username, password);

// To use token authentication the first parameter must be "authtoken"
// const client = new dbc.HttpClient("authtoken", token_from_panel);

// Get user balance
client.get_balance((balance) => {
    console.log(balance);
});

// Solve captcha with type 9 & geetest_params extra arguments
client.decode({extra: {type: 9, geetest_params: geetest_params}},
(captcha) => {

    if (captcha) {
        console.log('Captcha ' + captcha['captcha'] + ' solved: '
                                        + JSON.stringify(captcha['text']));

        // // To access the response by item
        // console.log('captcha_id:', captcha['text']['captcha_id'])
        // console.log('lot_number:', captcha['text']['lot_number'])
        // console.log('pass_token:', captcha['text']['pass_token'])
        // console.log('gen_time:', captcha['text']['gen_time'])
        // console.log('captcha_output:', captcha['text']['captcha_output'])

        /*
        * Report an incorrectly solved CAPTCHA.
        * Make sure the CAPTCHA was in fact incorrectly solved!
        * client.report(captcha['captcha'], (result) => {
        *   console.log('Report status: ' + result);
        * });
        */
    }

});

Built for Developers & Automation

Death By Captcha provides scalable infrastructure, hybrid solving technology, and developer-first API workflows for modern automation systems.

Fast Solving

Optimized infrastructure delivers fast Geetest v4 token generation for automation workflows.

Hybrid AI + Humans

Advanced OCR technology combined with 24/7 human solvers improves reliability and accuracy.

Proxy Support

Configure HTTP proxies directly inside API requests for advanced workflow consistency.

Multi SDK Support

Integrate quickly using Python, PHP, Node.js, Java, C#, Selenium, and more.

Scalable Platform

Infrastructure designed to support enterprise workloads and large automation projects.

Reliable Service

Over a decade of operational experience delivering CAPTCHA solving services worldwide.

Trusted CAPTCHA Infrastructure

Developer-focused CAPTCHA solving services designed for speed, reliability, and scale.

17+
Years Experience
24/7
Global Availability
16´s
Solve Time
99%
Accuracy Rate

Simple Integration Workflow

Start solving Geetest v4 challenges using a streamlined developer-friendly API workflow.

1

Create Request

Submit the target page URL, site key, and optional proxy configuration.

2

Generate Token

Receive the generated Geetest v4 token through the API response.

3

Complete Workflow

Use the returned token inside your automation systems and application flows.

Frequently Asked Questions

Common questions about integrating Death By Captcha Geetest v4 Solver API.

What is a Geetest v4 Solver API?

A Geetest v4 solver API solves image-alignment challenges used by the latest Geetest version, returning a JSON token (captcha_id, lot_number, pass_token, gen_time, captcha_output) that can be used within automated workflows and integrations.

What is captcha_id and how is it located?

captcha_id is a 32-character hash that identifies the Geetest v4 challenge on the target website. It is typically found in the page source or in the requests made to Geetest's servers when the widget loads.

How is Geetest v4 different from v3?

Geetest v4 uses a single captcha_id parameter instead of the gt and challenge pair required by v3. v4 also removes the dynamic challenge value, which simplifies the payload and the response, returning lot_number, pass_token, gen_time, and a base64 captcha_output.

What are the POST parameters for the Geetest v4 API?

The Geetest v4 API requires type=9 plus a geetest_params JSON payload containing proxy, proxytype, captcha_id, and pageurl. If proxy is provided, proxytype is required.

Which programming languages are supported?

Death By Captcha supports Python, PHP, Java, Node.js, C#, Selenium, and additional SDK integrations.

What is the token lifespan and response format for Geetest v4?

The Geetest v4 token is valid for one use and has a 2 minute lifespan. The response is a JSON object in the text field with five keys: captcha_id, lot_number, pass_token, gen_time, and captcha_output (base64-encoded).

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