Is it possible to play vs bots on FICS? I was playing a 15 min game vs some 2300 guy. He doesn't take any time to think about his next move, not even a second, not even against a c4 opening. When i offered him to play, he accepted immediately, instantly.

He blunders or should I say, he plays slow moves, but he's strong, so no obvious blunders. 

Is it possible that bots play on FICS servers? Like you run a bot client, connect it to the server and that's it? since there's no CAPTCHA or anything to make sure that you're a human? And since you can connect to FICS in so many ways?
To answer your question: There are computer accounts in FICS, with handles ending in (C). Also guests may be computers. There might be computers also behind other players, but that's against the rules of FICS. Engines can be connected to FICS using icsDrone, XBoard/WinBoard with Zippy, or similar tools.