Lemin

Lemin CAPTCHA is a puzzle-based verification system that presents interactive challenges such as sliding puzzles and image rotation tasks. It is designed as a privacy-focused alternative to traditional CAPTCHAs. The uCaptcha API solves Lemin challenges and returns a verification token, with or without a proxy.

Supported Types

Type	Proxy	Description
LeminTokenProxyLess	No	Solve without proxy (recommended)
LeminToken	Yes	Solve using your proxy

Parameters

Parameter	Type	Required	Description
type	string	Yes	Task type from the table above
websiteURL	string	Yes	URL of the page with the Lemin challenge
websiteKey	string	Yes	Lemin CAPTCHA ID (the captchaId value)

Proxy Parameters

Required when using the LeminToken task type.

Parameter	Type	Required	Description
proxyType	string	Yes	http, socks4, or socks5
proxyAddress	string	Yes	Proxy IP or hostname
proxyPort	integer	Yes	Proxy port
proxyLogin	string	No	Proxy username
proxyPassword	string	No	Proxy password

Create Task

Request

{
  "clientKey": "YOUR_API_KEY",
  "task": {
    "type": "LeminTokenProxyLess",
    "websiteURL": "https://example.com/contact",
    "websiteKey": "CROPPED_d3d4d56_73ca4008925b4f83a3cb57"
  }
}

Response

{
  "errorId": 0,
  "taskId": "abc-123-def"
}

Solution Object

{
  "token": "eyJhbGciOiJIUzI1NiIsInR5cCI6...Sf3xK2Qo"
}

Field	Type	Description
token	string	The Lemin verification token to submit with the form

How to Use

Once you receive the token value from the solution:

1. Form submission — Set the Lemin token in the appropriate hidden input field on the page and submit the form.
2. API call — Include the token in your request to the target server’s verification endpoint.

Code Examples

Python

import requests
import time

API_KEY = "YOUR_API_KEY"

# Create task
response = requests.post("https://api.ucaptcha.net/createTask", json={
    "clientKey": API_KEY,
    "task": {
        "type": "LeminTokenProxyLess",
        "websiteURL": "https://example.com/contact",
        "websiteKey": "CROPPED_d3d4d56_73ca4008925b4f83a3cb57"
    }
})
task_id = response.json()["taskId"]

# Poll for result
while True:
    result = requests.post("https://api.ucaptcha.net/getTaskResult", json={
        "clientKey": API_KEY,
        "taskId": task_id
    }).json()

    if result["status"] == "ready":
        token = result["solution"]["token"]
        print("Token:", token)
        break
    elif result["status"] == "failed":
        print("Error:", result.get("errorDescription"))
        break

    time.sleep(5)

JavaScript

const API_KEY = "YOUR_API_KEY";

const { taskId } = await fetch("https://api.ucaptcha.net/createTask", {
  method: "POST",
  headers: { "Content-Type": "application/json" },
  body: JSON.stringify({
    clientKey: API_KEY,
    task: {
      type: "LeminTokenProxyLess",
      websiteURL: "https://example.com/contact",
      websiteKey: "CROPPED_d3d4d56_73ca4008925b4f83a3cb57"
    }
  })
}).then(r => r.json());

while (true) {
  const result = await fetch("https://api.ucaptcha.net/getTaskResult", {
    method: "POST",
    headers: { "Content-Type": "application/json" },
    body: JSON.stringify({ clientKey: API_KEY, taskId })
  }).then(r => r.json());

  if (result.status === "ready") {
    console.log("Token:", result.solution.token);
    break;
  } else if (result.status === "failed") {
    console.error("Error:", result.errorDescription);
    break;
  }

  await new Promise(r => setTimeout(r, 5000));
}

cURL

# Create task
curl -X POST https://api.ucaptcha.net/createTask \
  -H "Content-Type: application/json" \
  -d '{
    "clientKey": "YOUR_API_KEY",
    "task": {
      "type": "LeminTokenProxyLess",
      "websiteURL": "https://example.com/contact",
      "websiteKey": "CROPPED_d3d4d56_73ca4008925b4f83a3cb57"
    }
  }'

# Poll for result (replace TASK_ID with the taskId from above)
curl -X POST https://api.ucaptcha.net/getTaskResult \
  -H "Content-Type: application/json" \
  -d '{
    "clientKey": "YOUR_API_KEY",
    "taskId": "TASK_ID"
  }'

Provider Coverage

• 2Captcha