As someone who's been in affiliate marketing for a while—especially in the VPN niche—I’ve tested a bunch of ad networks to find the right traffic sources that actually convert. For affiliates, the key is finding networks that offer solid targeting, reasonable CPC/CPM rates, and compliance with VPN offers.
PropellerAds is a go-to for many affiliates. It’s great for push and pop traffic, and they have a big reach in Tier 2 and 3 countries where VPN demand is high. I’ve seen good ROI on installs there, especially when paired with localized landing pages.
Another solid option is TrafficStars, which has high-converting adult traffic—surprisingly effective for VPN offers. If your offer allows adult placements, it can be a goldmine.
7Search PPC is one I added more recently. It’s not as well-known, but it works well for budget-friendly testing. I used it to validate a few angles before scaling. Their CPC model is great for affiliates trying to maximize ROI without burning through cash too quickly.