CAPTCHAs.IO API Documentation

Welcome to CAPTCHAs.IO API Document

CAPTCHAs.IO is the most stable and fastest captcha solving API web service provider in the Internet at present. This document covers all methods to automate captcha solving through a RESTFul Webservice API. Supported CAPTCHA types: Image CAPTCHAs, reCAPTCHAs, hCAPTCHAs, and Audio CAPTCHAs.

API Endpoint URL

https://api.captchas.io/in.php AND https://api.captchas.io/res.php

API Key

If you do not have an API key, signup to get one here.

API Parameters

Endpoint: https://api.captchas.io/in.php

Paramaters Possible Values / Description
key api_key - Your API key found in the console dashboard.
method
post - defines that you're sending an image with multipart form
base64 - defines that you're sending a base64 encoded image
userrecaptcha - defines that you're sending a Google reCAPTCHA request
hcaptcha - defines that you're sending an hCAPTCHA request
funcaptcha - defines that you're sending an FunCAPTCHA request
audio - defines that you're sending an audio captcha in MP3 format.
file Used when you're sending a post API request...
body Used when sending base64 requests...
googlekey data-sitekey - The Google reCAPTCHA data-sitekey value. Used when in userrecaptcha and hcaptcha mode.
sitekey data-sitekey - The hCAPTCHA data-sitekey value. Used when in hcaptcha mode.
publickey publickey - The FunCAPTCHA publickey value. Used when in funcaptcha mode.
surl Service URL - The FunCAPTCHA service URL value. Used when in funcaptcha mode.
pageurl pageurl - The Google reCAPTCHA page URL. Used when in userrecaptcha, funcaptcha, and hcaptcha mode.
invisible
0 - DEFAULT; normal reCAPTCHA type.
1 - means that reCAPTCHA is invisible type.
Used when in userrecaptcha mode.
min_score
Used when you are solving reCAPTCHA v3 only. The score needed for resolution. Currently it's is only possible to get a response with min. score 0.5
0.5 - DEFAULT, 0.1 ... 0.3 ... 0.5 ... 0.9
action verify - Used when you are solving reCAPTCHA v3 only. The value of action parameter you found on page...
version
v2 - DEFAULT; defines that you're sending a reCAPTCHA V2.
v3 - defines that you're sending a reCAPTCHA V3.
Used when in userrecaptcha mode.
json
0 - server will send the response as plain text
1 - tells the server to send the response as JSON
regsense
0 - server will send the response as case-insensitive.
1 - server will send the response as case-sensitive.
header_acao
0 - server will send the response as plain text / json headers
1 - tells the server to send the response with header "Access-Control-Allow-Origin: *".
proxy [optional] <proxy_ip>:<proxy_port>
proxytype [optional] HTTP, HTTPS, SOCKS4, SOCKS5

Endpoint: https://api.captchas.io/res.php

Paramaters Possible Values / Description
key api_key - Your API key found in the console dashboard.
action
getbalance — Get your account subscribed plan threads limit.
get — Get answer for captcha.
id The ID returned by the in.php endpoint. ex: 12345678
json
0 - server will send the response as plain text
1 - tells the server to send the response as JSON
header_acao
0 - server will send the response as plain text / json headers
1 - tells the server to send the response with header "Access-Control-Allow-Origin: *".

Image CAPTCHAs

API Parameters for solving Image CAPTCHAs.

Paramaters Possible Values / Description
key api_key - Your API key found in the console dashboard.
method
post - defines that you're sending an image with multipart form
base64 - defines that you're sending a base64 encoded image
file Used when you're sending a post API request...
body Used when sending base64 requests...
json
0 - server will send the response as plain text
1 - tells the server to send the response as JSON
regsense
0 - server will send the response as case-insensitive.
1 - server will send the response as case-sensitive.
header_acao
0 - server will send the response as plain text / json headers
1 - tells the server to send the response with header "Access-Control-Allow-Origin: *".

Audio CAPTCHAs

API Parameters for solving Audio CAPTCHAs.

Paramaters Possible Values / Description
key api_key - Your API key found in the console dashboard.
method
audio - defines that you're sending an audio captcha in MP3 format.
file Used when you're sending a audio API request...
json
0 - server will send the response as plain text
1 - tells the server to send the response as JSON
regsense
0 - server will send the response as case-insensitive.
1 - server will send the response as case-sensitive.
header_acao
0 - server will send the response as plain text / json headers
1 - tells the server to send the response with header "Access-Control-Allow-Origin: *".

reCAPTCHA V2

API Parameters for solving reCAPTCHA v2.

Paramaters Possible Values / Description
key api_key - Your API key found in the console dashboard.
method
userrecaptcha - defines that you're sending a Google reCAPTCHA request.
googlekey data-sitekey - The Google reCAPTCHA data-sitekey value. Used when in userrecaptcha and hcaptcha mode.
pageurl pageurl - The Google reCAPTCHA page URL. Used when in userrecaptcha, funcaptcha, and hcaptcha mode.
version
v2 - DEFAULT; defines that you're sending a reCAPTCHA V2.
json
0 - server will send the response as plain text
1 - tells the server to send the response as JSON
header_acao
0 - server will send the response as plain text / json headers
1 - tells the server to send the response with header "Access-Control-Allow-Origin: *".

reCAPTCHA V3

API Parameters for solving reCAPTCHA v3.

Paramaters Possible Values / Description
key api_key - Your API key found in the console dashboard.
method
userrecaptcha - defines that you're sending a Google reCAPTCHA request.
googlekey data-sitekey - The Google reCAPTCHA data-sitekey value. Used when in userrecaptcha and hcaptcha mode.
pageurl pageurl - The Google reCAPTCHA page URL. Used when in userrecaptcha, funcaptcha, and hcaptcha mode.
version
v3 - defines that you're sending a reCAPTCHA V3.
invisible
0 - DEFAULT; normal reCAPTCHA type.
1 - means that reCAPTCHA is invisible type.
Used when in userrecaptcha mode.
min_score
Used when you are solving reCAPTCHA v3 only. The score needed for resolution. Currently it's is only possible to get a response with min. score 0.5
0.5 - DEFAULT, 0.1 ... 0.3 ... 0.5 ... 0.9
action verify - Used when you are solving reCAPTCHA v3 only. The value of action parameter you found on page...
json
0 - server will send the response as plain text
1 - tells the server to send the response as JSON
header_acao
0 - server will send the response as plain text / json headers
1 - tells the server to send the response with header "Access-Control-Allow-Origin: *".

hCAPTCHA

API Parameters for solving hCAPTCHA.

Paramaters Possible Values / Description
key api_key - Your API key found in the console dashboard.
method
hcaptcha - defines that you're sending an hCAPTCHA request.
sitekey data-sitekey - The hCAPTCHA data-sitekey value. Used when in hcaptcha mode.
pageurl pageurl - The Google reCAPTCHA page URL. Used when in userrecaptcha, funcaptcha, and hcaptcha mode.
json
0 - server will send the response as plain text
1 - tells the server to send the response as JSON
header_acao
0 - server will send the response as plain text / json headers
1 - tells the server to send the response with header "Access-Control-Allow-Origin: *".

Error Responses

These are set of program error code responses for easy coding.

Code Description
ERROR_DAILY_SOLVES_LIMIT_REACHED You have reached your account's allowable daily solves limit. You can wait or you can upgrade your package plan in the console panel https://app.captchas.io/clients/v2/upgrades.
ERROR_NO_AVAILABLE_THREADS You have no more available threads in your account's subscribed plan, you can wait for the next thread to be free or you can upgrade your package plan in the console panel https://app.captchas.io/clients/v2/upgrades.
ERROR_CAPTCHA_UNSOLVABLE The CAPTCHA or reCAPTCHA is found to be unsolvable by our OCR system.
ERROR_API_KEY_NOT_FOUND The API key passed is not found in our database.
ERROR_ACCESS_DENIED Access to the API is denied, contact administrator at admin@CAPTCHAs.IO.

Emulator

Emulation from 2captcha.com

Please follow this step-by-step tutorial to migrate or use CAPTCHAs.IO API from the providers listed above.

These instructions applies only to Windows operated computers.

  1. Open and edit C:\Windows\System32\drivers\etc\hosts file.
  2. Write or encode:
    • 217.23.12.189    2captcha.com
  3. Open your software or application.
  4. Use your CAPTCHAs.IO API Key as Key.
  5. Re-run your application and check.
  6. Done.

Codes and Libraries

PHP

- A PHP wrapper for the API implementation of CAPTCHAs.IO. Download from Github.com

NodeJS

- CAPTCHAs.IO API wrapper for Node.js. Download from Github.com

Examples

HTML and Curl Examples

Normal Captchas HTML 
<form method="post" action="https://api.captchas.io/in.php">
	Method: <input type="text" name="method" value="post">
	Key: <input type="text" name="key" value="YOUR_APIKEY">
	Captcha: <input type="file" name="file">
	<input type="submit" value="Upload and get the ID">
</form>
Normal Captchas Curl 
curl -X POST -F "method=post" -F "key={YOUR_APIKEY}" -F "file=@/path/captcha.png" https://api.captchas.io/in.php
Base64 Submission 
<form method="post" action="https://api.captchas.io/in.php"">
	Method: <input type="text" name="method" value="base64">
	Key: <input type="text" name="key" value="YOUR_APIKEY">
	Captcha: <textarea name="body">%BASE64_STRING%</textarea>
	<input type="submit" value="Upload and get the ID">
</form>
Base64 Curl 
curl -X POST -F "method=base64" -F "key={YOUR_APIKEY}" -F "body={BASE64_STRING}" https://api.captchas.io/in.php
reCAPTCHA V2 
<form method="post" action="https://api.captchas.io/in.php"">
	Method: <input type="text" name="method" value="userrecaptcha">
	Key: <input type="text" name="key" value="YOUR_APIKEY">
	GoogleKEY: <input type="text" name="googlekey" value="GOOGLE_SITE_KEY">
	PageURL: <input type="text" name="pageurl" value="PAGE_URL">
	<input type="submit" value="Upload and get the ID">
</form>
reCAPTCHA V2 Curl 
curl -X POST -F "method=userrecaptcha" -F "key={YOUR_APIKEY}" -F "googlekey={GOOGLE_SITE_KEY}" -F "pageurl={PAGE_URL}" https://api.captchas.io/in.php
reCAPTCHA V3 
<form method="post" action="https://api.captchas.io/in.php"">
	Method: <input type="text" name="method" value="userrecaptcha">
	Key: <input type="text" name="key" value="YOUR_APIKEY">
	GoogleKEY: <input type="text" name="googlekey" value="GOOGLE_SITE_KEY">
	PageURL: <input type="text" name="pageurl" value="PAGE_URL">
	Version: <input type="text" name="version" value="v3">
	Action: <input type="text" name="action" value="verify">
	min_score: <input type="text" name="min_score" value="0.3">
	<input type="submit" value="Upload and get the ID">
</form>
reCAPTCHA V3 Curl 
curl -X POST -F "method=userrecaptcha" -F "key={YOUR_APIKEY}" -F "action=verify" -F "min_score=0.3" -F "googlekey={GOOGLE_SITE_KEY}" -F "pageurl={PAGE_URL}" -F "version=v3" https://api.captchas.io/in.php
Invisible reCAPTCHA 
<form method="post" action="https://api.captchas.io/in.php"">
	Method: <input type="text" name="method" value="userrecaptcha">
	Key: <input type="text" name="key" value="YOUR_APIKEY">
	GoogleKEY: <input type="text" name="googlekey" value="GOOGLE_SITE_KEY">
	PageURL: <input type="text" name="pageurl" value="PAGE_URL">
	Invisible: <input type="text" name="invisible" value="1">
	<input type="submit" value="Upload and get the ID">
</form>
Invisible Curl 
curl -X POST -F "method=userrecaptcha" -F "key={YOUR_APIKEY}" -F "googlekey={GOOGLE_SITE_KEY}" -F "pageurl={PAGE_URL}" -F "invisible=1" https://api.captchas.io/in.php
Audio CAPTCHA 
<form method="post" action="https://api.captchas.io/in.php">
	Method: <input type="text" name="method" value="audio">
	Key: <input type="text" name="key" value="YOUR_APIKEY">
	Captcha: <input type="file" name="file">
	<input type="submit" value="Upload and get the ID">
</form>
Audio CAPTCHA Curl 
curl -X POST -F "method=audio" -F "key={YOUR_APIKEY}" -F "file=@/path/to/audio.mp3" https://api.captchas.io/in.php

Get CAPTCHA Request Response Example

URL https://api.captchas.io/res.php GET Request 
https://api.captchas.io/res.php?key=z1337ce5-5c7518e745b927.58015102&action=get&json=1&id=14636988729

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