/in.php — Submit Task

Submit a CAPTCHA task using the 2captcha-compatible format. Drop-in replacement — change only the base URL.

https://2captcha.com/in.php
https://api.ucaptcha.net/in.php

Endpoint

GET|POST https://api.ucaptcha.net/in.php

Both GET (query params) and POST (form/JSON body) are accepted.

Authentication

Pass your uCaptcha API key as the key parameter.

Parameters

Required

Parameter	Type	Description
`key`	string	Your uCaptcha API key
`method`	string	Task type identifier (see Method Mapping below)

Method Mapping

The method parameter determines the task type.

`method`	Task Type	Required Fields
`userrecaptcha`	reCAPTCHA v2	`googlekey`, `pageurl`
`hcaptcha`	hCaptcha	`sitekey`, `pageurl`
`turnstile`	Cloudflare Turnstile	`sitekey`, `pageurl`
`funcaptcha`	FunCaptcha / Arkose Labs	`publickey`, `pageurl`
`geetest`	GeeTest v3	`gt`, `challenge`, `pageurl`
`captchafox`	CaptchaFox	`sitekey`, `pageurl`
`base64`	Image captcha (base64)	`body`
`post`	Image captcha (upload)	`body`

Task Parameters

Parameter	Type	Description
`googlekey`	string	reCAPTCHA site key
`sitekey`	string	hCaptcha / Turnstile / CaptchaFox site key
`publickey`	string	FunCaptcha public key
`pageurl`	string	URL of the target page
`body`	string	Base64-encoded image data
`invisible`	`0` \| `1`	Invisible reCAPTCHA flag
`enterprise`	`0` \| `1`	Enterprise variant flag
`action`	string	reCAPTCHA v3 action string
`min_score` / `score`	float	reCAPTCHA v3 minimum score (e.g. `0.9`)
`data-s`	string	reCAPTCHA data-s token
`domain`	string	Alternative API domain
`cookies`	string	Cookies to pass to the solver
`userAgent`	string	User-Agent to use during solving

Proxy Parameters

Parameter	Type	Description
`proxy`	string	Proxy address: `user:pass@ip:port` or `ip:port`
`proxytype`	string	`HTTP`, `SOCKS4`, or `SOCKS5`

Adding proxy + proxytype automatically upgrades ProxyLess task types to their Proxy variant.

Control Parameters

Parameter	Type	Description
`json`	`0` \| `1`	Return JSON format (`1`) or plain text (`0`, default)
`pingback`	string	Callback URL — receive result via webhook instead of polling
`soft_id`	string	Software ID for tracking
`header_acao`	`0` \| `1`	Add `Access-Control-Allow-Origin: *` header

Auto-Upgrade Rules

The endpoint automatically upgrades task types based on parameters:

proxy + proxytype → upgrades to Proxy variant (e.g. RecaptchaV2TaskProxyless → RecaptchaV2Task)
enterprise=1 → upgrades to Enterprise variant
invisible=1 → sets invisible flag on supported types

Response

Plain text (default)

Success:

OK|550e8400-e29b-41d4-a716-446655440000

Error:

ERROR_KEY_DOES_NOT_EXIST

JSON (`json=1`)