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Sep 13, 2021
May 20, 2022
Jun 29, 2020

C# Module for 2Captcha API

The easiest way to quickly integrate 2Captcha into your code to automate solving of any types of captcha.

Installation

Install nuget package from nuget

Configuration

TwoCaptcha instance can be created like this:

TwoCaptcha solver = new TwoCaptcha('YOUR_API_KEY');

Also there are few options that can be configured:

solver.SoftId = 123;
solver.Callback = "https://your.site/result-receiver";
solver.DefaultTimeout = 120;
solver.RecaptchaTimeout = 600;
solver.PollingInterval = 10;

TwoCaptcha instance options

Option Default value Description
softId - your software ID obtained after publishing in 2captcha sofware catalog
callback - URL of your web-sever that receives the captcha recognition result. The URl should be first registered in pingback settings of your account
defaultTimeout 120 Polling timeout in seconds for all captcha types except ReCaptcha. Defines how long the module tries to get the answer from res.php API endpoint
recaptchaTimeout 600 Polling timeout for ReCaptcha in seconds. Defines how long the module tries to get the answer from res.php API endpoint
pollingInterval 10 Interval in seconds between requests to res.php API endpoint, setting values less than 5 seconds is not recommended

IMPORTANT: once Callback is defined for TwoCaptcha instance, all methods return only the captcha ID and DO NOT poll the API to get the result. The result will be sent to the callback URL. To get the answer manually use getResult method

Solve captcha

When you submit any image-based captcha use can provide additional options to help 2captcha workers to solve it properly.

Captcha options

Option Default Value Description
numeric 0 Defines if captcha contains numeric or other symbols see more info in the API docs
minLength 0 minimal answer lenght
maxLength 0 maximum answer length
phrase 0 defines if the answer contains multiple words or not
caseSensitive 0 defines if the answer is case sensitive
calc 0 defines captcha requires calculation
lang - defines the captcha language, see the list of supported languages
hintImg - an image with hint shown to workers with the captcha
hintText - hint or task text shown to workers with the captcha

Below you can find basic examples for every captcha type. Check out examples directory to find more examples with all available options.

Basic example

Example below shows a basic solver call example with error handling.

Normal captcha = new Normal();
captcha.SetFile("path/to/captcha.jpg");
captcha.SetMinLen(4);
captcha.SetMaxLen(20);
captcha.SetCaseSensitive(true);
captcha.SetLang("en");

try
{
    await solver.Solve(captcha);
    Console.WriteLine("Captcha solved: " + captcha.Code);
}
catch (Exception e)
{
    Console.WriteLine("Error occurred: " + e.Message);
}

Normal Captcha

To bypass a normal captcha (distorted text on image) use the following method. This method also can be used to recognize any text on the image.

Normal captcha = new Normal();
captcha.SetFile("path/to/captcha.jpg");
captcha.SetNumeric(4);
captcha.SetMinLen(4);
captcha.SetMaxLen(20);
captcha.SetPhrase(true);
captcha.SetCaseSensitive(true);
captcha.SetCalc(false);
captcha.SetLang("en");
captcha.SetHintImg(new FileInfo("path/to/hint.jpg"));
captcha.SetHintText("Type red symbols only");

Text Captcha

This method can be used to bypass a captcha that requires to answer a question provided in clear text.

Text captcha = new Text();
captcha.SetText("If tomorrow is Saturday, what day is today?");
captcha.SetLang("en");

ReCaptcha v2

Use this method to solve ReCaptcha V2 and obtain a token to bypass the protection.

ReCaptcha captcha = new ReCaptcha();
captcha.SetSiteKey("6Le-wvkSVVABCPBMRTvw0Q4Muexq1bi0DJwx_mJ-");
captcha.SetUrl("https://mysite.com/page/with/recaptcha");
captcha.SetInvisible(true);
captcha.SetEnterprise(false);
captcha.SetAction("verify");
captcha.SetProxy("HTTPS", "login:password@IP_address:PORT");

ReCaptcha v3

This method provides ReCaptcha V3 solver and returns a token.

ReCaptcha captcha = new ReCaptcha();
captcha.SetSiteKey("6Le-wvkSVVABCPBMRTvw0Q4Muexq1bi0DJwx_mJ-");
captcha.SetUrl("https://mysite.com/page/with/recaptcha");
captcha.SetVersion("v3");
captcha.SetEnterprise(false);
captcha.SetDomain("google.com");
captcha.SetAction("verify");
captcha.SetScore(0.3);
captcha.SetProxy("HTTPS", "login:password@IP_address:PORT");

FunCaptcha

FunCaptcha (Arkoselabs) solving method. Returns a token.

FunCaptcha captcha = new FunCaptcha();
captcha.SetSiteKey("69A21A01-CC7B-B9C6-0F9A-E7FA06677FFC");
captcha.SetUrl("https://mysite.com/page/with/funcaptcha");
captcha.SetSUrl("https://client-api.arkoselabs.com");
captcha.SetUserAgent("Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/83.0.4103.61 Safari/537.36");
captcha.SetData("anyKey", "anyValue");
captcha.SetProxy("HTTPS", "login:password@IP_address:PORT");

GeeTest

Method to solve GeeTest puzzle captcha. Returns a set of tokens as JSON.

GeeTest captcha = new GeeTest();
captcha.SetGt("f2ae6cadcf7886856696502e1d55e00c");
captcha.SetApiServer("api-na.geetest.com");
captcha.SetChallenge("12345678abc90123d45678ef90123a456b");
captcha.SetUrl("https://mysite.com/captcha.html");
captcha.SetProxy("HTTPS", "login:password@IP_address:PORT");

hCaptcha

Use this method to solve hCaptcha challenge. Returns a token to bypass captcha.

HCaptcha captcha = new HCaptcha();
captcha.SetSiteKey("10000000-ffff-ffff-ffff-000000000001");
captcha.SetUrl("https://www.site.com/page/");
captcha.SetProxy("HTTPS", "login:password@IP_address:PORT");

KeyCaptcha

Token-based method to solve KeyCaptcha.

KeyCaptcha captcha = new KeyCaptcha();
captcha.SetUserId(10);
captcha.SetSessionId("493e52c37c10c2bcdf4a00cbc9ccd1e8");
captcha.SetWebServerSign("9006dc725760858e4c0715b835472f22");
captcha.SetWebServerSign2("2ca3abe86d90c6142d5571db98af6714");
captcha.SetUrl("https://www.keycaptcha.ru/demo-magnetic/");
captcha.SetProxy("HTTPS", "login:password@IP_address:PORT");

Capy

Token-based method to bypass Capy puzzle captcha.

Capy captcha = new Capy();
captcha.SetSiteKey("PUZZLE_Abc1dEFghIJKLM2no34P56q7rStu8v");
captcha.SetUrl("https://www.mysite.com/captcha/");
captcha.SetProxy("HTTPS", "login:password@IP_address:PORT");

Grid

Grid method is originally called Old ReCaptcha V2 method. The method can be used to bypass any type of captcha where you can apply a grid on image and need to click specific grid boxes. Returns numbers of boxes.

Grid captcha = new Grid();
captcha.SetFile("path/to/captcha.jpg");
captcha.SetRows(3);
captcha.SetCols(3);
captcha.SetPreviousId(0);
captcha.SetCanSkip(false);
captcha.SetLang("en");
captcha.SetHintImg(new FileInfo("path/to/hint.jpg"));
captcha.SetHintText("Select all images with an Orange");

Canvas

Canvas method can be used when you need to draw a line around an object on image. Returns a set of points' coordinates to draw a polygon.

Canvas captcha = new Canvas();
captcha.SetFile("path/to/captcha.jpg");
captcha.SetPreviousId(0);
captcha.SetCanSkip(false);
captcha.SetLang("en");
captcha.SetHintImg(new FileInfo("path/to/hint.jpg"));
captcha.SetHintText("Draw around apple");

ClickCaptcha

ClickCaptcha method returns coordinates of points on captcha image. Can be used if you need to click on particular points on the image.

Coordinates captcha = new Coordinates();
captcha.SetFile("path/to/captcha.jpg");
captcha.SetLang("en");
captcha.SetHintImg(new FileInfo("path/to/hint.jpg"));
captcha.SetHintText("Select all images with an Orange");

Rotate

This method can be used to solve a captcha that asks to rotate an object. Mostly used to bypass FunCaptcha. Returns the rotation angle.

Rotate captcha = new Rotate();
captcha.SetFile("path/to/captcha.jpg");
captcha.SetAngle(40);
captcha.SetLang("en");
captcha.SetHintImg(new FileInfo("path/to/hint.jpg"));
captcha.SetHintText("Put the images in the correct way up");

Other methods

send / getResult

These methods can be used for manual captcha submission and answer polling.

string captchaId = await solver.Send(captcha);

Task.sleep(20 * 1000);

string code = await solver.GetResult(captchaId);

balance

Use this method to get your account's balance

double balance = await solver.Balance();

report

Use this method to report good or bad captcha answer.

await solver.Report(captcha.Id, true); // captcha solved correctly
await solver.Report(captcha.Id, false); // captcha solved incorrectly

Error handling

If case of an error captcha solver throws an exception. It's important to properly handle these cases. We recommend to use try catch to handle exceptions.

try
{
    await solver.Solve(captcha);
}
catch (ValidationException e)
{
    // invalid parameters passed
}
catch (NetworkException e)
{
    // network error occurred
}
catch (ApiException e)
{
    // api respond with error
}
catch (TimeoutException e)
{
    // captcha is not solved so far
}