What's the best tool for discovering what your IP is when you are using TOR?
I've been using some available on the Internet but recently they all look the same and they all ask for CAPTYA which is an obvious attempt to obtain ones true IP.
That's not what I discussed in this comment. On TOR browser, you don't need some other service to tell you your public IP address as you can see the address of the exit node in your browser.
What? I've never heard such a thing. CAPTCHA is to make sure bots can't get past. Humans only.
Who gets asked to solve a CAPTCHA depends, in this case I bet you connected to an exit node known to the system as a bad actor and everyone using that exit gets asked.
Try refreshing your TOR circuit and use a different exit node. Could help.