Hello
I hope some of you guys can help me out here.
If you want to build an decentralized marketplace, where the mainstream people could buy stuff online, how would you do the payment?
I mean, mainstream people dosent own bitcoin lisk or anything else, but only creditcards.
But if its build with creditcards, it isnt decentralized. Is it?
Hope someone have some ideas here

Thanks in advance!
Maybe you shouldn't think in absolutes. Wenn you deal with fiat money, then, yes, part of your marketplace won't be decentralized. Other parts will.
How you implement a fiat gateway I don't know exactly, but one way or another, you'd have to have a unique selling point, a thing that makes your marketplace different than others and better than others. My suggestion: a built-in escrow service.