CPA stands for Cost Per Action (sometimes called Cost Per Acquisition). In this model, advertisers only pay when a specific action is completed by a user.

For advertisers, CPA is one of the lowest-risk advertising models because you only pay for actual results, not just clicks or impressions. This makes it highly performance-driven.

For publishers (affiliates), CPA can be very profitable—but it also requires high-quality, targeted traffic. Since conversions are required, simply generating clicks is not enough.

CPA advertising is ideal for those who want to focus on real conversions and measurable results rather than just traffic.
Are you running CPA campaigns or promoting CPA offers? What has worked best for you?