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Retargeting Base only sells traffic on a CPM (Cost per Thousand Impressions) basis, and you are always in control of your maximum CPM bid. 

With this metrics we can provide you the option to buy impressions in the same way they are sold in the market.

In the advertising world impressions are sold at CPM, using this way we can keep providing you the best rates of those impressions. 

However, even though traffic is bought and sold on a CPM basis, you will see in the report also an Effective Cost Per Click (eCPC). The stats also report your Effective Cost Per Acquisition (eCPA).