API Endpoint Mapping: CaptchaAI vs Competitors

Switching CAPTCHA solving providers shouldn't require rewriting your integration. This reference maps CaptchaAI's API endpoints, parameters, and responses against 2Captcha, Anti-Captcha, and CapMonster Cloud — so you know exactly what to change.

Base URLs

Provider	Submit endpoint	Result endpoint
CaptchaAI	`https://ocr.captchaai.com/in.php`	`https://ocr.captchaai.com/res.php`
2Captcha	`https://2captcha.com/in.php`	`https://2captcha.com/res.php`
Anti-Captcha	`https://api.anti-captcha.com/createTask`	`https://api.anti-captcha.com/getTaskResult`
CapMonster Cloud	`https://api.capmonster.cloud/createTask`	`https://api.capmonster.cloud/getTaskResult`

CaptchaAI uses the same URL structure as 2Captcha. Migrating from 2Captcha requires only changing the domain.

API style

Provider	API style	Content type	Auth
CaptchaAI	Form/query params	`application/x-www-form-urlencoded`	`key` param
2Captcha	Form/query params	`application/x-www-form-urlencoded`	`key` param
Anti-Captcha	JSON body	`application/json`	`clientKey` in body
CapMonster Cloud	JSON body	`application/json`	`clientKey` in body

reCAPTCHA v2

CaptchaAI / 2Captcha

POST /in.php
  key=API_KEY
  method=userrecaptcha
  googlekey=SITE_KEY
  pageurl=PAGE_URL
  json=1

Anti-Captcha / CapMonster

POST /createTask
{
  "clientKey": "API_KEY",
  "task": {
    "type": "RecaptchaV2TaskProxyless",
    "websiteURL": "PAGE_URL",
    "websiteKey": "SITE_KEY"
  }
}

Parameter mapping

CaptchaAI	Anti-Captcha/CapMonster	Description
`key`	`clientKey`	API key
`method=userrecaptcha`	`type=RecaptchaV2TaskProxyless`	Task type
`googlekey`	`websiteKey`	reCAPTCHA sitekey
`pageurl`	`websiteURL`	Target page URL
`invisible=1`	`isInvisible: true`	Invisible reCAPTCHA
`enterprise=1`	`type=RecaptchaV2EnterpriseTaskProxyless`	Enterprise flag

reCAPTCHA v3

CaptchaAI / 2Captcha

POST /in.php
  key=API_KEY
  method=userrecaptcha
  googlekey=SITE_KEY
  pageurl=PAGE_URL
  version=v3
  action=verify
  min_score=0.7

Anti-Captcha / CapMonster

{
  "clientKey": "API_KEY",
  "task": {
    "type": "RecaptchaV3TaskProxyless",
    "websiteURL": "PAGE_URL",
    "websiteKey": "SITE_KEY",
    "minScore": 0.7,
    "pageAction": "verify"
  }
}

Cloudflare Turnstile

CaptchaAI

POST /in.php
  key=API_KEY
  method=turnstile
  sitekey=SITE_KEY
  pageurl=PAGE_URL

Anti-Captcha

{
  "clientKey": "API_KEY",
  "task": {
    "type": "TurnstileTaskProxyless",
    "websiteURL": "PAGE_URL",
    "websiteKey": "SITE_KEY"
  }
}

hCaptcha

CaptchaAI / 2Captcha

POST /in.php
  key=API_KEY
  method=hcaptcha
  sitekey=SITE_KEY
  pageurl=PAGE_URL

Anti-Captcha

{
  "clientKey": "API_KEY",
  "task": {
    "type": "HCaptchaTaskProxyless",
    "websiteURL": "PAGE_URL",
    "websiteKey": "SITE_KEY"
  }
}

GeeTest v3

CaptchaAI / 2Captcha

POST /in.php
  key=API_KEY
  method=geetest
  gt=GT_VALUE
  challenge=CHALLENGE_VALUE
  pageurl=PAGE_URL

Anti-Captcha

{
  "clientKey": "API_KEY",
  "task": {
    "type": "GeeTestTaskProxyless",
    "websiteURL": "PAGE_URL",
    "gt": "GT_VALUE",
    "challenge": "CHALLENGE_VALUE"
  }
}

Image CAPTCHA

CaptchaAI / 2Captcha

POST /in.php
  key=API_KEY
  method=base64
  body=BASE64_IMAGE

Anti-Captcha

{
  "clientKey": "API_KEY",
  "task": {
    "type": "ImageToTextTask",
    "body": "BASE64_IMAGE"
  }
}

Polling for results

CaptchaAI / 2Captcha

GET /res.php?key=API_KEY&action=get&id=TASK_ID&json=1

Response: {"status":1,"request":"TOKEN"}
Not ready: {"status":0,"request":"CAPCHA_NOT_READY"}

Anti-Captcha / CapMonster

POST /getTaskResult
{
  "clientKey": "API_KEY",
  "taskId": 123456
}

Response: {"status":"ready","solution":{"gRecaptchaResponse":"TOKEN"}}
Not ready: {"status":"processing"}

Balance check

Provider	Endpoint	Response
CaptchaAI	`GET /res.php?key=KEY&action=getbalance`	`12.345`
2Captcha	`GET /res.php?key=KEY&action=getbalance`	`12.345`
Anti-Captcha	`POST /getBalance {"clientKey":"KEY"}`	`{"balance":12.345}`
CapMonster	`POST /getBalance {"clientKey":"KEY"}`	`{"balance":12.345}`

Error codes

Scenario	CaptchaAI / 2Captcha	Anti-Captcha
Wrong API key	`ERROR_WRONG_USER_KEY`	`ERROR_KEY_DOES_NOT_EXIST`
Zero balance	`ERROR_ZERO_BALANCE`	`ERROR_ZERO_BALANCE`
Bad sitekey	`ERROR_WRONG_GOOGLEKEY`	`ERROR_RECAPTCHA_INVALID_SITEKEY`
Not ready	`CAPCHA_NOT_READY`	`status: "processing"`
Rate limited	`ERROR_TOO_MUCH_REQUESTS`	`ERROR_TOO_MUCH_REQUESTS`