Online Survey Ads: What's the payout and how do you get them?

Hey guys just have a quick question.

I'm developing a few niche sites that are MFA and while browsing I'm sure
we've all run across those annoying survey ads that ask for you to
complete a survey before going into whatever site your trying to go to.

I'm guessing that people don't put that up for free so I'm wondering where
can I apply to get this on my sites? Does putting these on violate
Google's Adsense terms? Or can I even apply to get them on at all?

Thanks!

cant post links
Go to Making Money then CPA youll find list of sites there.