Yeah. If the conversation is: A: Thank you. B: Anytime Then B is saying they will help A anytime, i.e. it's not a problem, i.e. A is welcome.

Yes, as a response to "Thank you", you could say: -- You're welcome. -- Any time. -- My pleasure. All are common and mean the same thing.

Sorry, I'm not a native speaker. I think it means more something like "It's always a pleasure to help you." So it has a slightly different meaning than "you're welcome", but is used in similar or same circumstances.