Voluum has four cost models available to help you track your traffic spend (recommended).
CPC (Cost Per Click) – calculated using the number of visits to the campaign URL multiplied by the CPC value.
CPA (Cost Per Acquisition) – calculated as the number of conversions multiplied by a defined CPA rate.
CPM (Cost Per Mille/Thousand) – cost is based on dividing the value of the bid by every 1,000 impressions generated by an ad.
Voluum Info: To learn more on impressions, go to the Tracking Impressions in Voluum guide.
Auto – only available if the traffic source supports a cost parameter and placeholder; See 50onRed Intext example screenshot below;