I think you might be seeing the captcha ID. The deathbycaptcha API works like this: You upload a captcha, it returns HTML or JSON containing an ID number. Then using this ID number, you keep requesting another URL until the captcha is solved. Once it has been solved, this 2nd URL will contain the captcha solution in HTML or JSON. I do not use uBot at all, rather a perl script, and have been able to get accurate captcha solutions from both deathbycaptcha and decaptcher. I should also share that I did a 24 hour test on decaptcher, and the results were pretty good. I uploaded 3138 captcha