you can add calculated KPIs to your master API reports. This enables you to have your own calculated reports included in your Master API reports.
You can insert any number of built-in KPIs in the calculated KPI formulas.
Standard arithmetic operators are supported: addition (+) encoded as %2b, subtraction (-), multiplication (*), division (/) encoded as %2f.
Calculated KPI field names must start with calculated_kpi_, followed by any valid string, such as, calculated_kpi_purchaserate.
Examples:
First three days combined retention
calculated_kpi_3days_retention=retention_day_1%2Bretention_day_2%2Bretention_day_3
Average revenue per impression
calculated_kpi_rev_per_impression=revenue%2Fimpression
Cohort day 7 ROI
calculated_kpi_roi_day_7=(cohort_day_7_total_revenue_per_user-average_ecpi)%2Faverage_ecpi