Effective Cost Per Action

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Effective Cost Per Action (often abbreviated to eCPA) is a phrase often used in online advertising and online marketing circles.

CPA is considered the optimal form of buying online advertising from the advertiser's point of view, as they only pay for an advert when an action has occurred. An action can be a product being purchased, a form being filled, etc. (The desired action to be performed is determined by the advertiser.)

eCPA is used to measure the effectiveness of advertising inventory purchased (by the advertiser) via a CPC, CPM, or CPT basis. In other words, the eCPA tells the advertiser what they would have paid if they purchased the advertising inventory on a CPA basis (instead of a CPC, CPM, or CPT basis).