Captcha AI

captchaai.com API

captchaai is an AI-powered image and CAPTCHA recognition service. captchaAI's main purpose is solving your CAPTCHAs in a quick and cost effictive way by using AI "Artificial Intelligence".


Introduction

We provide an API that allows you to automate the process and integrate your software with our service.

We also have a software to emulate other captcha services. Check CaptchaAI Emulator

There are few simple steps to solve your captcha or recognize the image:

  • 1. Send your image or captcha to our server.
  • 2. Get the ID of your task.
  • 3. Start a cycle that checks if your task is completed.
  • 4. Get the result.

Captcha types

Type of captcha/method Description
Normal Captcha 27,500+ image captchas including, Solve Media, Google captcha, reCAPTCHA v1, Facebook captcha, etc.
reCAPTCHA V2 Google reCaptcha V2
reCAPTCHA V3 Google reCaptcha V3

Solving Captchas

Our API is based on HTTP requests and supports both HTTP and HTTPS protocols.

API endpoints:

  • https://ocr.captchaai.com/in.php is used to submit a captcha
  • https://ocr.captchaai.com/res.php is used to get the captcha solution

The process of solving captchas with captchaai is really easy and it's mostly the same for all types of captchas:

  1. Get your API key from your API key. Each user is given a unique authentication token, we call it API key. It's a 32-characters string that looks like:
    347bc2896fc1812d3de5ab56a0bf4ea7
    This key will be used for all your requests to our server.
  2. Submit a HTTP POST request to our API URL: https://ocr.captchaai.com/in.php with parameters corresponding to the type of your captcha.
    Server will return captcha ID or an error code if something went wrong.
  3. Make a timeout: 20 seconds for reCAPTCHA, 5 seconds for other types of captchas.
  4. Submit a HTTP GET request to our API URL:https://ocr.captchaai.com/res.php to get the result.
    If captcha is already solved server will return the answer in format corresponding to the type of your captcha.
    By default answers are returned as plain text like: OK|Your answer. But answer can also be returned as JSON {"status":1,"request":"TEXT"} if json parameter is used.
    If captcha is not solved yet server will return CAPCHA_NOT_READY result. Repeat your request in 5 seconds.
    If something went wrong server will return an error code.

Normal Captcha

Normal Captcha is an image that contains distored but human-readable text. To solve the captcha user have to type the text from the image.

To solve the captcha with our service you have to submit the image with HTTP POST request to our API URL: https://ocr.captchaai.com/in.php
Server accepts images in multipart or base64 format.

Multipart sample form

<form method="post" action="https://ocr.captchaai.com/in.php" enctype="multipart/form-data">
  <input type="hidden" name="method" value="post">
  Your key:
  <input type="text" name="key" value="YOUR_APIKEY">
  The CAPTCHA file:
  <input type="file" name="file">
  <input type="submit" value="Upload and get the ID">
</form>

YOUR_APIKEY is Your API key.

Base64 sample form

<form method="post" action="https://ocr.captchaai.com/in.php">
  <input type="hidden" name="method" value="base64">
  Your key:
  <input type="text" name="key" value="YOUR_APIKEY">
  The CAPTCHA file body in base64 format:
    <textarea name="body">BASE64_FILE</textarea>
    <input type="submit" value="Upload and get the ID">
</form>

YOUR_APIKEY is here your API key.

BASE64_FILE is base64-encoded image body.

You can provide additional parameters with your request to define what kind of captcha you'resending and to help workers to solve your captcha correctly. You can find the full list of parameters in the table below.

If everything is fine server will return the ID of your captcha as plain text, like:OK|123456789 or as JSON {"status":1,"request":"123456789"} if json parameter was used.

If something went wrong server will return an error. See Error Handling chapter for the list of errors.

Make a 5 seconds timeout and submit a HTTP GET request to our API URL: https://ocr.captchaai.com/res.php providing the captcha ID. The list of parameters is in the table below.

If everything is fine and your captcha is solved server will return the answer as plain text, like: OK|TEXT or as JSON {"status":1,"request":"TEXT"} if json parameter was used.

Otherwise server will return CAPCHA_NOT_READY that means that your captcha is not solved yet. Just repeat your request in 5 seconds.

If something went wrong server will return an error. See Error Handling chapter for the list of errors.

List of POST request parameters for https://ocr.captchaai.com/in.php

POST parameter Type Required Description
key String Yes your API key
method String Yes post - defines that you're sending an image with multipart form
base64 - defines that you're sending a base64 encoded image
file File Yes* Captcha image file.
* - required if you submit image as a file (method=post)
body String Yes* Base64-encoded captcha image
* - required if you submit image as Base64-encoded string (method=base64)
phrase Integer
Default: 0
No 0 - captcha contains one word
1 - captcha contains two or more words
regsense Integer
Default: 0
No 0 - captcha in not case sensitive
1 - captcha is case sensitive
numeric Integer
Default: 0
No 0 - not specified
1 - captcha contains only numbers
2 - captcha contains only letters
3 - captcha contains only numbers OR only letters
4 - captcha contains both numbers AND letters
calc Integer
Default: 0
No 0 - not specified
1 - captcha requires calculation (e.g. type the result 4 + 8 = )
min_len Integer
Default: 0
No 0 - not specified
1..20 - minimal number of symbols in captcha
max_len Integer
Default: 0
No 0 - not specified
1..20 - maximal number of symbols in captcha
language Integer
Default: 0
No 0 - not specified
1 - Cyrillic captcha
2 - Latin captcha
lang String No Language code. See the list of supported languages.
json Integer
Default: 0
No 0 - server will send the response as plain text
1 - tells the server to send the response as JSON

List of GET request parameters for https://ocr.captchaai.com/res.php

GET parameter Type Required Description
key String Yes your API key
action String Yes get - get the asnwer for your captcha
id Integer Yes ID of captcha returned by in.php.
json Integer
Default: 0
No 0 - server will send the response as plain text
1 - tells the server to send the response as JSON
header_acao Integer
Default: 0
No 0 - disabled
1 - enabled.
If enabled res.php will include Access-Control-Allow-Origin:* header in the response.
Used for cross-domain AJAX requests in web applications.

Request URL example:

https://ocr.captchaai.com/res.php?key=347bc2896fc1812d3de5ab56a0bf4ea7&action=get&id=123456789

reCAPTCHA V2

reCAPTCHA V2 also known as I'm not a robot reCAPTCHA is a very popular type of captcha that looks like this:

Solving reCAPTCHA V2 with our method is pretty simple:

  1. Look at the element's code at the page where you found reCAPTCHA.

  2. Find a link that begins with www.google.com/recaptcha/api2/anchor or find data-sitekey parameter.

  3. Copy the value of k parameter of the link (or value of data-sitekey parameter).

  4. Submit a HTTP GET or POST request to our API URL: https://ocr.captchaai.com/in.php with method set to userrecaptcha and the value found on previous step as value for googlekey and full page URL as value for pageurl. Sending proxies is not obligatory ar the moment but it's recommended.
    You can find the full list of parameters in the table below.

    Request URL example:

    https://ocr.captchaai.com/in.php?key=347bc2896fc1812d3de5ab56a0bf4ea7&method=userrecaptcha&googlekey=6Le-wvkSVVABCPBMRTvw0Q4Muexq1bi0DJwx_mJ-&pageurl=https://mysite.com/page/with/recaptcha
  5. If everything is fine server will return the ID of your captcha as plain text, like: OK|123456789 or as JSON {"status":1,"request":"123456789"} if json parameter was used.
    Otherwise server will return an error code.

  6. Make a 15-20 seconds timeout then submit a HTTP GET request to our API URL: https://ocr.captchaai.com/res.php to get the result.
    The full list of parameters is in the table below.

    If captcha is already solved server will respond in plain text or JSON and return the answer token that looks like:

    03AHJ_Vuve5Asa4koK3KSMyUkCq0vUFCR5Im4CwB7PzO3dCxIo11i53epEraq-uBO5mVm2XRikL8iKOWr0aG50sCuej9bXx5qcviUGSm4iK4NC_Q88flavWhaTXSh0VxoihBwBjXxwXuJZ-WGN5Sy4dtUl2wbpMqAj8Zwup1vyCaQJWFvRjYGWJ_TQBKTXNB5CCOgncqLetmJ6B6Cos7qoQyaB8ZzBOTGf5KSP6e-K9niYs772f53Oof6aJeSUDNjiKG9gN3FTrdwKwdnAwEYX-F37sI_vLB1Zs8NQo0PObHYy0b0sf7WSLkzzcIgW9GR0FwcCCm1P8lB-50GQHPEBJUHNnhJyDzwRoRAkVzrf7UkV8wKCdTwrrWqiYDgbrzURfHc2ESsp020MicJTasSiXmNRgryt-gf50q5BMkiRH7osm4DoUgsjc_XyQiEmQmxl5sqZP7aKsaE-EM00x59XsPzD3m3YI6SRCFRUevSyumBd7KmXE8VuzIO9lgnnbka4-eZynZa6vbB9cO3QjLH0xSG3-egcplD1uLGh79wC34RF49Ui3eHwua4S9XHpH6YBe7gXzz6_mv-o-fxrOuphwfrtwvvi2FGfpTexWvxhqWICMFTTjFBCEGEgj7_IFWEKirXW2RTZCVF0Gid7EtIsoEeZkPbrcUISGmgtiJkJ_KojuKwImF0G0CsTlxYTOU2sPsd5o1JDt65wGniQR2IZufnPbbK76Yh_KI2DY4cUxMfcb2fAXcFMc9dcpHg6f9wBXhUtFYTu6pi5LhhGuhpkiGcv6vWYNxMrpWJW_pV7q8mPilwkAP-zw5MJxkgijl2wDMpM-UUQ_k37FVtf-ndbQAIPG7S469doZMmb5IZYgvcB4ojqCW3Vz6Q

    If captcha is not solved yet server will return CAPCHA_NOT_READY result. Repeat your request in 5 seconds.

    If something went wrong server will return an error code.

  7. Locate the element with id g-recaptcha-response and make it visible deleting display:none parameter.

    Please note: sometimes content on the page is generated dynamically and you will not see this element in html source.
    In such cases you have to explore javascript code that generates the content. "Inspect" option in Google Chrome can help in that.

    As an alternative you can just use javascript to set the value of g-recaptcha-response field:

    document.getElementById("g-recaptcha-response").innerHTML="TOKEN_FROM_captchaai";

  8. An input field will appear on the page. And you just have to paste the answer token to that field and submit the form.

  9. Congratulations, you've passed the recaptcha


reCAPTCHA Callback

Sometimes there's no submit button and a callback function is used isntead. The function is when reCAPTCHA is solved.

Callback function is usually defined in data-callback parameter of reCAPTCHA, for example:

data-callback="myCallbackFunction"

Or sometimes it's defined as callback parameter of grecaptcha.render function, for example:

grecaptcha.render('example', {'sitekey' : 'someSitekey','callback' : myCallbackFunction,'theme' : 'dark'});

Also there's another way to find the callback function - open javascript console of your browser and explore reCAPTCHA configuration object:

___grecaptcha_cfg.clients[0].aa.l.callback

Note that aa.l may change and there can be multiple clients so you have to check clients[1], clients[2] too.

Finally all you have to do is to call that function:

myCallbackFunction();

Or even this way:

___grecaptcha_cfg.clients[0].aa.l.callback();

Sometimes it is required to provide an argument and in most cases you should put the token there. For example:

myCallbackFunction('TOKEN');

Invisible reCAPTCHA V2

reCAPTCHA V2 also has an invisible version.
You may check how it looks like here: https://www.google.com/recaptcha/api2/demo?invisible=true
We added parameter invisible=1 that should be used for invisible reCAPTCHA.

Invisible reCAPTCHA is located on a DIV layer positioned -10 000 px from top that makes it invisible for user.

reCAPTCHA is activated on page load or on user's actions like click somewhere or submit a form - that depends on the website. If user's cookies are good enough then he will just pass it utomatically and no additional actions will be required. Otherwise user will see standard eCAPTCHA form with a challenge.

In most cases when challenge is completed a callback function is executed. You can read more about callback here.

If you are still not sure — there are few ways to determine that reCAPTCHA is in invisible mode:

  • You don't see "I'm not a robot" checkbox on the page but getting recaptcha challenge making some actions there
  • reCAPTCHA's iframe link contains parameter size=invisible
  • reCAPTCHA's configuration object contains parameter size that is set to invisible, for example ___grecaptcha_cfg.clients[0].aa.l.size is equal to invisible

How to bypass invisible reCAPTCHA in browser?

Method 1: using javascript:

  1. Change the value of g-recaptcha-response element to the token you received from our server:
  2. document.getElementById("g-recaptcha-response").innerHTML="TOKEN_FROM_captchaai"; 
  3. Execute the action that needs to be performed on the page after solving reCAPTCHA.

  4. Usually there's a form that should be submitted and you need to identify the form by id or name or any other attribute and then submit the form. Here are few examples:

    document.getElementById("recaptcha-demo-form").submit(); //by id "recaptcha-demo-form"
    document.getElementsByName("myFormName")[0].submit(); //by element name "myFormName"
    document.getElementsByClassName("example").submit(); //by class name "example"

    Or sometimes there's a callback function executed when reCAPTCHA is solved.

    Callback function is usually defined in data-callback parameter of reCAPTCHA, for example:

    data-callback="myCallbackFunction"

    Or sometimes it's defined as callback parameter of grecaptcha.render function, for example:

    grecaptcha.render('example', {
      'sitekey' : 'someSitekey',
      'callback' : myCallbackFunction,
      'theme' : 'dark'
    });

    And all you have to do is to call that function:

    myCallbackFunction();
  5. Voila! You've done that with just 2 strings of code.

Method 2: changing HTML:

  1. Cut the div containing reCAPTCHA from page body.
  2. <div style="visibility: hidden; position: absolute; width:100%; top: -10000px; left: 0px; right: 0px; transition: visibility 0s linear 0.3s, opacity 0.3s linear; opacity: 0;">
    <div style="width: 100%; height: 100%; position: fixed; top: 0px; left: 0px; z-index: 2000000000; background-color: #fff; opacity: 0.5;  filter: alpha(opacity=50)">
    </div>
    <div style="margin: 0 auto; top: 0px; left: 0px; right: 0px; position: absolute; border: 1px solid #ccc; z-index: 2000000000; background-color: #fff; overflow: hidden;">
    <iframe src="https://www.google.com/recaptcha/api2/bframe?hl=en&amp;v=r20170213115309&amp;k=6LfP0CITAAAAAHq9FOgCo7v_fb0-pmmH9VW3ziFs#zglq3yifgkmj" title="recaptcha challenge" style="width: 100%; height: 100%;" scrolling="no" name="zglq3yifgkmj" frameborder="0"></iframe>
    </div>
    </div>
  3. Cut the whole block:
  4. <div class=""><!-- BEGIN: ReCAPTCHA implementation example. -->
    <div id="recaptcha-demo" class="g-recaptcha" data-sitekey="6LfP0CITAAAAAHq9FOgCo7v_fb0-pmmH9VW3ziFs" data-callback="onSuccess" data-bind="recaptcha-demo-submit"><div class="grecaptcha-badge" style="width: 256px; height: 60px; transition: right 0.3s ease 0s; position: fixed; bottom: 14px; right: -186px; box-shadow: 0px 0px 5px gray;"><div class="grecaptcha-logo"><iframe src="https://www.google.com/recaptcha/api2/anchor?k=6LfP0CITAAAAAHq9FOgCo7v_fb0-pmmH9VW3ziFs&amp;co=aHR0cHM6Ly93d3cuZ29vZ2xlLmNvbTo0NDM.&amp;hl=en&amp;v=r20170213115309&amp;size=invisible&amp;cb=uror1hlow5a" title="recaptcha widget" scrolling="no" name="undefined" width="256" height="60" frameborder="0"></iframe></div><div class="grecaptcha-error"></div><textarea id="g-recaptcha-response" name="g-recaptcha-response" class="g-recaptcha-response" style="width: 250px; height: 40px; border: 1px solid #c1c1c1; margin: 10px 25px; padding: 0px; resize: none;  display: none; "></textarea></div></div>
    <script>
        var onSuccess = function (response) {
            var errorDivs = document.getElementsByClassName("recaptcha-error");
            if (errorDivs.length) {
                errorDivs[0].className = "";
            }
            var errorMsgs = document.getElementsByClassName("recaptcha-error-message");
            if (errorMsgs.length) {
                errorMsgs[0].parentNode.removeChild(errorMsgs[0]);
            }
            document.getElementById("recaptcha-demo-form").submit();
        };
    </script><!-- Optional noscript fallback. --><!-- END: ReCAPTCHA implementation example. --></div>
  5. Put the following code instead of the block you've just cut:
  6. <input type="submit">
    <textarea name="g-recaptcha-response">%g-recaptcha-response%</textarea>

    Where %g-recaptcha-response% - is an answer token you’ve got from our service.

  7. You will see “Submit query” button.
    Press the button to submit the form with g-recaptcha-response and all other form data to the website.

List of GET/POST request parameters for https://ocr.captchaai.com/in.php

Parameter Type Required Description
key String Yes your API key
method String Yes userrecaptcha - defines that you're sending a reCAPTCHA V2 with new method
googlekey String Yes Value of k or data-sitekey parameter you found on page
pageurl String Yes Full URL of the page where you see the reCAPTCHA
domain String
Default: google.com
No Domain used to load the captcha: google.com or recaptcha.net
invisible Integer
Default: 0
No 1 - means that reCAPTCHA is invisible. 0 - normal reCAPTCHA.
data-s String No Value of data-s parameter you found on page. Curenttly applicable for Google Search and other Google services.
cookies String No Your cookies that will be passed to our worker who solve the captha. We also return worker's cookies in the response if you use json=1.
Format: KEY:Value, separator: semicolon, example: KEY1:Value1;KEY2:Value2;
userAgent String No Your userAgent that will be passed to our worker and used to solve the captcha.
header_acao Integer
Default: 0
No 0 - disabled
1 - enabled.
If enabled in.php will include Access-Control-Allow-Origin:* header in the response.
Used for cross-domain AJAX requests in web applications. Also supported by res.php.
json Integer
Default: 0
No 0 - server will send the response as plain text
1 - tells the server to send the response as JSON
proxy String No Format: login:password@123.123.123.123:3128
You can find more info about proxies here.
proxytype String No Type of your proxy: HTTP, HTTPS, SOCKS4, SOCKS5.

List of GET request parameters for https://ocr.captchaai.com/res.php

GET parameter Type Required Description
key String Yes your API key
action String Yes get - get the asnwer for your captcha
id Integer Yes ID of captcha returned by in.php.
json Integer
Default: 0
No 0 - server will send the response as plain text
1 - tells the server to send the response as JSON

Request URL example:

https://ocr.captchaai.com/res.php?key=347bc2896fc1812d3de5ab56a0bf4ea7&action=get&id=123456789

reCAPTCHA V3

reCAPTCHA V3 is the newest type of captcha from Google. It has no challenge so there is no need for user interaction. Instead it uses a "humanity" rating - score.

reCAPTCHA V3 technically is quite similar to reCAPTCHA V2: customer receives a token from reCAPTCHA API which is then sent inside a POST request to the target website and verified via reCAPTCHA API.

The difference is now reCAPTCHA API returns rating of a user detecting whether he was a real human or a bot. This rating is called score and could be a number from 0.1 to 0.9. his score is passed to the website which then decides what to do with the user request.

Also there is a new parameter action allowing to process user actions on the website differently. After the verification of token reCAPTCHA API returns the name of the action user performed.

Our approach for solving reCAPTCHA V3
We've performed many experiments and figured out that if a user got score 0.1 on some website then he is likely to get the same score on other websites.

We are detecting the scores of our workers. Then when we've got a request for solving reCAPTCHA V3 with the minimal rating min_score we pass the captcha to the worker with the requested rating or higher. Most of the requests will get the requested rating on targer websites with reCAPTCHA V3.

How to solve reCAPTCHA V3 using captchaai:

  1. First you've got to be sure the target website is actually using reCAPTCHA V3

    There should be V3 if:

    • there is no captcha and no images to click on
    • api.js script is loading with the render=sitekey parameter, for example:
      https://www.google.com/recaptcha/api.js?render=6LfZil0UAAAAAAdm1Dpzsw9q0F11-bmervx9g5fE
    • clients array of ___grecaptcha_cfg object is using index 100000: ___grecaptcha_cfg.clients[100000]

  2. To start solving reCAPTCHA V3 using our API first you've got to find three parameters:

    sitekey - this parameter could be obtained from the URI of api.js as a value of render parameter. It could also be found inside URI of iframe with reCAPTCHA, in javascript code of the website where it's calling grecaptcha.execute function or in ___grecaptcha_cfg configuration object.

    action - you've got to find this inspecting javascript code of the website looking for call of grecaptcha.execute function. Example: grecaptcha.execute('6LfZil0UAAAAAAdm1Dpzsw9q0F11-bmervx9g5fE', {action: do_something}).
    Sometimes it's really hard to find it and you've got to dig through all js-files loaded by website. You may also try to find the value of action parameter inside___grecaptcha_cfg configuration object but usually it's undefined. In that case you have to call grecaptcha.execute and inspect javascript code. If you can't find it try to use the default value "verify" - our API will use it if you don't provide action in your request.

    pageurl - full URL of the page where you see the reCAPTCHA V3.

    Now you need to understand the score you need to solve V3. You can't predict what score is acceptable for the website you want to solve at. It can only be figured out by trial and error. The lowest score is 0.1 which means "robot", the highest is 0.9 which means "human". But most sites uses thresholds from 0.2 to 0.5 because real humans receive a low score oftenly. Our service is able to provide solutions which requires the score of 0.3. Higher score is extreamly rare among workers.

  3. Having all necessary parameters stated above you may send request to our API.

  4. Submit a HTTP GET or POST request to our API URL:
    https://ocr.captchaai.com/in.php
    with method set to userrecaptcha and version set to v3 along with min_score set to score website requires, sitekey inside googlekey parameter and full page URL as value for pageurl. You have to include action parameter to or else we will use default value verify.

    List of request parameters below.

    URL request sample:

    https://ocr.captchaai.com/in.php?key=347bc2896fc1812d3de5ab56a0bf4ea7&method=userrecaptcha&version=v3&action=verify&min_score=0.3&googlekey=6LfZil0UAAAAAAdm1Dpzsw9q0F11-bmervx9g5fE&pageurl=https://mysite.com/page/
  5. If everything is fine server will return the ID of your captcha as plain text,like: OK|123456789 or as JSON {"status":1,"request":"123456789"} if json parameter was used.

    If something went wrong server will return an error. See Error Handling chapter for the list of errors.

  6. Make a 10-15 seconds timeout and submit a HTTP GET request to our API https://ocr.captchaai.com/res.php providing the captcha ID. The list of parameters is in the table below.

    If everything is fine and your captcha is solved server will return the answer as plain text or as JSON. The answer is a token like this:

    03AHJ_Vuve5Asa4koK3KSMyUkCq0vUFCR5Im4CwB7PzO3dCxIo11i53epEraq-uBO5mVm2XRikL8iKOWr0aG50sCuej9bXx5qcviUGSm4iK4NC_Q88flavWhaTXSh0VxoihBwBjXxwXuJZ-WGN5Sy4dtUl2wbpMqAj8Zwup1vyCaQJWFvRjYGWJ_TQBKTXNB5CCOgncqLetmJ6B6Cos7qoQyaB8ZzBOTGf5KSP6e-K9niYs772f53Oof6aJeSUDNjiKG9gN3FTrdwKwdnAwEYX-F37sI_vLB1Zs8NQo0PObHYy0b0sf7WSLkzzcIgW9GR0FwcCCm1P8lB--gf50q5BMkiRH7osm4DoUgsjc_XyQiEmQmxl5sqZP7aKsaE-EM00x59XsPzD3m3YI6SRCFRUevSyumBd7KmXE8VuzIO9lgnnbka4-eZynZa6vbB9cO3QjLH0xSG3--o-fxrOuphwfrtwvvi2FGfpTexWvxhqWICMFTTjFBCEGEgj7_IFWEKirXW2RTZCVF0Gid7EtIsoEeZkPbrcUISGmgtiJkJ_KojuKwImF0G0CsTlxYTOU2sPsd5o1JDt65wGniQR2IZufnPbbK76Yh_KI2DY4cUxMfcb2fAXcFMc9dcpHg6f9wBXhUtFYTu6pi5LhhGuhpkiGcv6vWYNxMrpWJW_pV7q8mPilwkAP-zw5MJxkgijl2wDMpM-UUQ_k37FVtf-ndbQAIPG7S469doZMmb5IZYgvcB4ojqCW3Vz6Q

    If the captcha is not solved yet server will return CAPCHA_NOT_READY.Just repeat your request in 5 seconds.

    If something went wrong server will return an error. See Error Handling chapter for the list of errors.

    Sample request:

    https://ocr.captchaai.com/res.php?key=347bc2896fc1812d3de5ab56a0bf4ea7&action=get&json=1&id=123456789
  7. After receiving the token from our API you've got to use it properly on the target website. Best way to understant that is to check the requests sent to site when you act as a normal user. Most browsers has developer's console tool where you should check Network tab.

    Usually token is sent using POST request. It could be g-recaptcha-response just like reCAPTCHA V2 does or g-recaptcha-response-100000. It could be other parameter too. So you'vegot to inspect the requests and find out how exactly the token supposed to be sent. Then you have to compose your request accordingly.

  8. Now when you have successfully submit the token you may tell us if it worked or not. If not we will refund the money you spent on this token. If it was successfully accepted we will set the worker who solved this captcha as the priority solver for you. Besides we will gather statistics regarding V3 solution which will help us to further investigate this new type of captchas and make our service better.

    To let us know whether it worked or not please send the request to https://ocr.captchaai.com/res.php with your API Key in key parameter with ID of the captcha in id parameter and indicating action parameter. Next to mention is reportgood if token was accepted successfully or reportbad if token wasn't accepted respectfully.

    Request examples:

    https://ocr.captchaai.com/res.php?key=347bc2896fc1812d3de5ab56a0bf4ea7&action=reportbad&id=123456789
    https://ocr.captchaai.com/res.php?key=347bc2896fc1812d3de5ab56a0bf4ea7&action=reportgood&id=123456789

List of GET/POST request parameters for https://ocr.captchaai.com/in.php

Parameter Type Required Description
key String Yes your API key
method String Yes userrecaptcha — defines that you're sending a reCAPTCHA
version String Yes v3 — defines that you're sending a reCAPTCHA V3
googlekey String Yes Value of sitekey parameter you found on page
pageurl String Yes Full URL of the page where you see the reCAPTCHA
domain String
Default: google.com
No Domain used to load the captcha: google.com or recaptcha.net
action String
Default: verify
No Value of action parameter you found on page
min_score Integer
Default: 0.4
No The score needed for resolution. Currently it's almost impossible to get token with score higher than 0.3
header_acao Integer
Default: 0
No 0 — disabled
1 — enabled.
If enabled in.php will include Access-Control-Allow-Origin:*: header in the response.
Used for cross-domain AJAX requests in web applications. Also supported by res.php.
json Integer
Default: 0
No 0 — server will send the response as plain text
1 — tells the server to send the response as JSON

List of GET request parameters for https://ocr.captchaai.com/res.php

GET parameter Type Required Description
key String Yes your API key
action String Yes get — get the asnwer for your captcha
reportgood — - report the asnwer was accepted
reportbad — - report the asnwer was declined
id Integer Yes ID of captcha returned by in.php.
json Integer
Default: 0
No 0 — server will send the response as plain text
1 — tells the server to send the response as JSON
header_acao Integer
Default: 0
No 0 — disabled
1 — enabled.
If enabled res.php will include Access-Control-Allow-Origin:* header in the response.
Used for cross-domain AJAX requests in web applications.

Language support

Our API allows you to set the language of captcha with lang parameter.

Each our worker can tell us which languages he speaks. When you submit a captcha with lang parameter we will distribute your captcha to workers who speak the language. That allows you to solve non-latin and non-cyrillic captchas, for example chinese or vietnamese.

The list of supported languages is available in the table below.

Language code (lang value) Language
en English
ru Russian
es Spanish
pt Portuguese
uk Ukrainian
vi Vietnamese
fr French
id Indonesian
ar Arab
ja Japanese
tr Turkish
de German
zh Chinese
fil Philippine
pl Polish
th Thai
it Italian
nl Nederlands (Dutch)
sk Slovak
bg Bulgarian
ro Romanian
hu Hungarian (Magyar)
ko Korean
cs Czech
az Azerbaijani
fa Persian (Farsi)
bn Bengali
el Greek
lt Lithuanian
lv Latvian
sv Swedish
sr Serbian
hr Croatian
he Hebrew
hi Hindi
nb Norwegian
sl Slovenian
da Danish
uz Uzbek
fi Finnish
ca Catalan
ka Georgian
ms Malay
te Telugu
et Estonian
ml Malayalam
be Belorussian
kk Kazakh
mr Marathi
ne Nepali
my Burmese
bs Bosnian
hy Armenian
mk Macedonian
pa Punjabi (Punjabi)

Using proxies

Proxies can be used to solve most types of javascript-based captchas:

Proxy allows to solve the captcha from the same IP address as you load the page.
Using proxies is not obligatory in most cases. But for some kind of protection you should use it. For example: Cloudflare and Datadome protection pages require IP matching.

Proxies are not supported for reCAPTCHA V3 as proxies dramatically decrease the success rate for this types of captcha.

If you send us the proxy, we check it's availability trying to open the website through you proxy, and if we can't do that we will not use your proxy.
If we're able to use your proxy - we'll load the reCAPTCHA through it for solving.

We support the following proxy types: SOCKS4, SOCKS5, HTTP, HTTPS with authentication by IP address or login and password.

If your proxy uses login/password authentication you have to include your credentials in proxy parameter.

POST parameters for proxies

POST parameter Type Required Description
proxy String No Format for IP authentication: IP_address:PORT
Example: proxy=123.123.123.123:3128
Format for login/password authentication: login:password@IP_address:PORT
Example: proxy=proxyuser:strongPassword@123.123.123.123:3128
proxytype String No Type of your proxy: HTTP, HTTPS, SOCKS4, SOCKS5.
Example: proxytype=SOCKS4

Error Handling

It's very important to use proper error handling in your code to avoid suspension of your account and service interruption.

Normally if something is wrong with your request server will return an error.
Below you can find tables with lists of errors with descriptions:

Errors can be returned as plain text or as JSON if you provided json=1 parameter.

In very rare cases server can return HTML page with error text like 500 or 502 - please keep it in mind and handle such cases correctly.
If you received anything that doesn't looks like the answer or error code - make a 5 seconds timeout and then retry your request.

List of in.php errors

Error code Description Action
ERROR_WRONG_USER_KEY You've provided key parameter value in incorrect format, it should contain 32 symbols. Stop sending requests. Check your API key.
ERROR_KEY_DOES_NOT_EXIST The key you've provided does not exists. Stop sending requests. Check your API key.
ERROR_ZERO_BALANCE You don't have free threads. Send less captchas at a time or upgrade your plan.
ERROR_PAGEURL pageurl parameter is missing in your request. Stop sending requests and change your code to provide valid pageurl parameter.
More info.
ERROR_ZERO_CAPTCHA_FILESIZE Image size is less than 100 bytes. Check the image file.
ERROR_TOO_BIG_CAPTCHA_FILESIZE Image size is more than 100 kB. Check the image file.
ERROR_WRONG_FILE_EXTENSION Image file has unsupported extension. Accepted extensions: jpg, jpeg, gif, png. Check the image file.
ERROR_IMAGE_TYPE_NOT_SUPPORTED Server can't recognize image file type. Check the image file.
ERROR_UPLOAD Server can't get file data from your POST-request.
That happens if your POST-request is malformed or base64 data is not a valid base64 image.
You got to fix your code that makes POST request.
IP_BANNED Your IP address is banned due to many frequent attempts to access the server using wrong authorization keys. Ban will be automatically lifted after 5 minutes.
ERROR_BAD_TOKEN_OR_PAGEURL You can get this error code when sending reCAPTCHA V2. That happens if your request contains invalid pair of googlekey and pageurl. The common reason for that is that reCAPTCHA is loaded inside an iframe hosted on another domain/subdomain. Explore code of the page carefully to find valid pageurl and sitekey values.
ERROR_GOOGLEKEY You can get this error code when sending reCAPTCHA V2. That means that sitekey value provided in your request is incorrect: it's blank or malformed. Check your code that gets the sitekey and makes requests to our API.
ERROR_WRONG_GOOGLEKEY googlekey parameter is missing in your request Check your code that gets the sitekey and makes requests to our API.
ERROR_CAPTCHAIMAGE_BLOCKED You've sent an image that is marked in our database as unrecognizable.
Usually that happens if the website where you found the captcha stopped sending you captchas and started to send "deny access" image.
Try to override website's limitations.
ERROR_BAD_PARAMETERS The error code is returned if some required parameters are missing in your request or the values have incorrect format. Check that your request contains all the required parameters and the values are in proper format.
ERROR_BAD_PROXY You can get this error code when sending a captcha via proxy server which ismarked as BAD by our API. Use a different proxy server in your requests.
ERROR_SERVER_ERROR Something went worng with our server. Try again after 10 seconds.
ERROR_INTERNAL_SERVER_ERROR Something went worng with our captcha processing servers. Try again after 10 seconds.

List of res.php errors

Error code Description Action
CAPCHA_NOT_READY Your captcha is not solved yet. Make 5 seconds timeout and repeat your request.
ERROR_CAPTCHA_UNSOLVABLE We are unable to solve your captcha it may be not supported. Check if supported & you can retry to send your captcha.
ERROR_WRONG_USER_KEY You've provided key parameter value in incorrect format, it shouldcontain 32 symbols. Stop sending requests. Check your API key.
ERROR_KEY_DOES_NOT_EXIST The key you've provided does not exists. Stop sending requests. Check your API key.
ERROR_WRONG_ID_FORMAT You've provided captcha ID in wrong format. The ID can contain numbers only. Check the ID of captcha or your code that gets the ID.
ERROR_WRONG_CAPTCHA_ID You've provided incorrect captcha ID. Check the ID of captcha or your code that gets the ID.
ERROR_EMPTY_ACTION Action parameter is missing or no value is provided for action parameter. Check your request parameters and add the neccessary value, e.g. get or getbalance.
ERROR_PROXY_CONNECTION_FAILED You can get this error code if we were unable to load a captcha through your proxy server. The proxy will be marked as BAD by our API and we will not accept requests with the proxy during 10 minutes.
You will recieve ERROR_BAD_PROXY code from in.php API endpoint in such case.
Use a different proxy server in your requests.
ERROR_INTERNAL_SERVER_ERROR Something went worng with our captcha processing servers. Try again after 10 seconds.