CPA vs CPI

CPA and CPI represent two different points in the user acquisition funnel where an affiliate gets paid. CPA pays when a referred user completes a qualifying action — typically a deposit, trade, or purchase. CPI pays when a user installs the operator's mobile app. The fundamental trade-off is between quality assurance and volume: CPA guarantees the user has taken a monetizable action before the affiliate earns, while CPI rewards the affiliate for a much earlier, less committal event.

In iGaming and forex affiliate programs, CPA dominates because operators need depositing or trading users, not just app installations. An install without a deposit generates zero revenue, making pure CPI risky for operators in these verticals. However, some operators use CPI as part of a blended strategy: paying a small CPI fee to incentivize mobile app installs, then layering a CPA bonus when the user deposits. This hybrid approach combines reach with quality assurance.

The fraud profiles of CPA and CPI differ significantly. CPA fraud typically involves fabricated deposits, self-referral, or incentivized actions that don't represent genuine user intent. CPI fraud involves install farms, device emulators, and SDK spoofing where installs are generated at scale without real users. Operators running CPI campaigns need mobile measurement partner (MMP) integrations and fraud detection tools calibrated specifically for mobile install fraud patterns.