You can retrieve the performance statistics for your campaign budgets by
selecting metric fields of campaign_budget in a
GAQL query. By default all statistics are aggregated at the budget level, one
row per budget. If segment fields are used, you may get more than one row per
budget. See segmentation for
details.
The following GAQL query retrieves conversion performance of a single budget, filtering on its ID:
SELECT segments.conversion_action, metrics.value_per_conversion FROM campaign_budget WHERE campaign_budget.id = campaign_budget_id