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Olá pessoal hoje eu trago aqui para vcs um site muito mas muito barato  de uma api de ocr captcha que vai ser muito util para vcs ae nos trabalhos de cnpj buscando ae direto da receita eu ja publiquei aqui como obter os dados na receita com o c# o codigo esta na area de upload hoje vou mostrar como ler automaticamente uma captcha
primeira coisa a fazer criar uma conta nesse site

https://azcaptcha.com/

string key = 'SUA KEY DO SITE';

public static String gethtmlform(string Url) //htmlform
        {

            HttpWebRequest myRequest = (HttpWebRequest)WebRequest.Create(Url);
            myRequest.Method = 'GET';
            WebResponse myResponse = myRequest.GetResponse();
            StreamReader sr = new StreamReader(myResponse.GetResponseStream(), System.Text.Encoding.UTF8);
            string result = sr.ReadToEnd();
            sr.Close();
            myResponse.Close();

            return result;
        }
        public string captcharesult()  //captcharesult
        {
            //POST
            try
            {
                System.Net.ServicePointManager.Expect100Continue = false;
                var request = (HttpWebRequest)WebRequest.Create('http://azcaptcha.com/in.php');
                string base64String1 = '';
                using (Image image = Image.FromFile(@'C:/SUA_IMAGEM_DA_CAPTCHA.JPG'))
                {
                    using (MemoryStream m = new MemoryStream())
                    {
                        image.Save(m, image.RawFormat);
                        byte[] imageBytes = m.ToArray();

                        // Convert byte[] to Base64 String
                        base64String1 = Convert.ToBase64String(imageBytes);
                    }
                }
                string base64string = base64String1; //Convert.ToBase64String(GetCaptchaImage());
                var postData = 'method=base64&key=' + key + '&body=' + WebUtility.UrlEncode(base64string);
                var data = Encoding.ASCII.GetBytes(postData);
                request.Method = 'POST';
                request.ContentType = 'application/x-www-form-urlencoded';
                request.ContentLength = data.Length;
                using (var stream = request.GetRequestStream())
                {
                    stream.Write(data, 0, data.Length);
                }
                var response = (HttpWebResponse)request.GetResponse();
                string responseString = new StreamReader(response.GetResponseStream()).ReadToEnd();
                if (responseString.Contains('OK|'))
                {
                    //  GET
                    string captcha = '';

                    while (true)
                    {
                        captcha = gethtmlform('http://azcaptcha.com/res.php?key=' + key + '&action=get&id=' + responseString.Split('|')[1]);
                        if (captcha == 'CAPCHA_NOT_READY')
                        {
                            System.Threading.Thread.Sleep(5000);
                            continue;
                        }
                        if (captcha == '_')
                        {
                            System.Threading.Thread.Sleep(5000);
                            continue;
                        }

                        if (captcha.Contains('OK|'))
                        {
                            captcha = captcha.Replace('OK|', '');

                        }
                        txtLetras.Text=(captcha); // PARA ONDE VAI RETORNAR
                        return captcha;

                    }
                }
                return '';
            }
            catch (Exception e)
            {
                string tt = e.Message;
                return tt;
            }

        }

PARA CHAMAR O EVENTO
captcharesult();