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What Is CPA (Cost Per Action)? CPA (Cost Per Action, sometimes Cost Per Acquisition) is a pricing model where advertisers pay only when a user completes a defined action. Because payment depends on results, it forms the backbone of affiliate and performance marketing worldwide. How the CPA Model Works An affiliate drives traffic to an offer. When a visitor completes the required action, a conversion fires through a pixel or postback URL, and the affiliate earns the agreed payout. The advertiser only pays for verified outcomes, minimizing wasted ad spend and making campaign budgeting predictable. CPA vs Other Pricing Models Model Payment Trigger Risk Bearer CPA Completed action Publisher CPC Click Advertiser CPM 1,000 impressions Advertiser CPL Lead submitted Publisher Common CPA Action Types Action Example Difficulty Email submit (SOI) Enter email Easy Lead (DOI) Confirm email Medium Sale Purchase product Hard Install Download app Medium Why Advertisers Prefer CPA CPA aligns spend directly with revenue. Advertisers know their exact cost per customer, making budgeting predictable and ROI easy to calculate. Publishers, meanwhile, can earn high payouts if they optimize their traffic and landing pages effectively. Key Takeaways CPA is measurable, results-driven, and low-risk for advertisers. Success depends on matching quality traffic to the right offer, testing landing pages, and tracking every conversion accurately. It remains the dominant model across the CPA marketing industry.