не за что

Literally, “there's nothing for”. See also German da nicht für.

• IPA^(key): [ˈnʲe‿zə‿ʂtə] (phonetic respelling: не́зашто)

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не́ за что • (né za što)

1. Used other than figuratively or idiomatically: see нечего (nečevo),‎ за (za).
2. you're welcome, not at all, don't mention it
3. not worth mentioning, nothing to speak of
4. no problem

• ни за что́ (ni za štó)