I've never used AtomicDex because I don't have any interest in the vast majority of altcoins, but it certainly looks like a nice design. Can you provide any links I can read about them adding fiat support though? I quick search of their website, github and subreddit doesn't turn up anything relevant.
I don't have any links with more information but I can see that Fiat option is coming soon in their desktop wallet, like you can see in screenshot I made below.
Not sure how all this will work in real life situations, but I saw that Visa Payment Solution Gleec made partnership with them few days ago.
