It really depends on your traffic source and if your traffic is targeted to the offer.
It depends which niche, the traffic country, the traffic source, incentive or non incentive offer etc etc
Just for an email submit? my traffic source is from IG, i didnt think the niche would matter
I'm also interesting what is the best CPA
Guys this is not the way it works. You don't go to random people in the streets and ask "what is the best shop ?" without giving any details on your niche. That's not how money is made online sorry.
But the niche is irrelevant in this case lol