Best Native Ad Network for Custom AdWall

What network do you guys recommend that allows native ad requests in order to build a custom app wall if any? I have implemented Avocarrot however a request to them only returns the same ad over and over. I understand the technicalities behind why this is but I’m looking for an ad network that allows me to build a never ending scrolling app wall of native ads where not every ad returned will be the same.

Any recommendations? Thanks.

AppNext has native ads and they work pretty nice. But you wont get “endless” wall - the number of ads depends on country in which user is. I think they have some nice ad amounts for even low-tier countries