Solve CAPTCHAs using the Webvisum API, requires a valid Webvisum username and password.

webvisum.py

import sys
import urllib2
import requests
from xml.dom import minidom
from time import sleep

API_URL = 'http://api.webvisum.com/api_rest'
USERNAME = ''
PASSWORD = ''

def login(username, password):
    response = requests.get(API_URL,
            params={'api_version': '1.0', 
                'app_version': '0.7.7',
                'user_name': username,
                'password': password,
                'method': 'auth.login'})
    doc = minidom.parseString(response.content)
    return doc.getElementsByTagName('session_key')[0].firstChild.nodeValue

def solve_captcha(session_id, captcha_image):
    data = {'session_key': session_id,
        'page_url': 'http://foobar.com/',
        'method': 'captcha.submit',
    }
    files = {'file': captcha_image}
    response = requests.post(API_URL, data=data,
            files=files)
    doc = minidom.parseString(response.content)
    return doc.getElementsByTagName('hash')[0].firstChild.nodeValue

def get_captcha_result(session_id, captcha_hash):
    data = {'session_key': session_id, 'hash': captcha_hash, 'method':
    'captcha.result'}
    response = requests.get(API_URL, params=data)
    doc = minidom.parseString(response.content)
    eta = doc.getElementsByTagName('eta')[0].firstChild.nodeValue
    text = doc.getElementsByTagName('text')[0].firstChild
    if text:
        text = text.nodeValue
    return eta, text

def main():
    session_id = login(USERNAME, PASSWORD)
    print 'Logged in, session ID:', session_id
    captcha_image = urllib2.urlopen(sys.argv[1])
    captcha_hash = solve_captcha(session_id, captcha_image)
    result = ''
    while not result:
        sleep(1)
        eta, result = get_captcha_result(session_id, captcha_hash)
        if result:
            print 'Captcha result:', result
        else:
            print 'ETA:', eta

if __name__ == "__main__":
    main()