EPC is total commission earned divided by total clicks sent to an offer, giving a normalized way to compare how well different offers convert and pay out regardless of how much traffic each has received. A high-EPC offer can justify a higher acceptable CPC on the ad side and still be profitable.
Affiliates and media buyers use EPC as a fast filter when choosing which of several similar CPA offers to run traffic to, since a slightly lower payout-per-action offer can still have a better EPC overall if it converts clicks at a meaningfully higher rate.

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