Blended Metrics are metrics created by Polar using metrics from multiple sources and based on the most commonly used metrics in e-commerce.
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Here is the full list:

ACOS

Ad Platforms ACV

Ad Platforms Clicks

Ad Platforms Conversion Value

Ad Platforms Conversions

Ad Platforms CPC

Ad Platforms CPM

Ad Platforms CPO

Ad Platforms CTR

Ad Platforms Impressions

Ad Platforms Order Rate

Ad Platforms Revenue per Click

Ad Platforms Revenue per Impression

Ad Platforms ROAS

Ad Spend

Blended Average Order Value

Blended CAC

Blended CPO

Blended Discounts

Blended Gross Sales

Blended ncROAS

Blended Net Sales

Blended POAS (Profit on Ad Spend)

Blended Product Quantity

Blended ROAS (MER)

Blended Shipping

Blended Tax

Blended Total Orders

Blended Total Sales

CM3

GA Paid ROAS

Klaviyo Revenue

Klaviyo Sends

Klaviyo Spams

Klaviyo Unique Clicks

Klaviyo Unique Opens

Klaviyo Unsubscribes

LTV:CAC Ratio

Shopify Conversion Rate