You could use
&get_summary=1
This should add a ‘summary’ block under ‘additional _data’
"additional_data": {
"summary": {
"values_total": {
"USD": {
"value": 12,
"count": 1,
"value_converted": 12,
"value_formatted": "$12",
"value_converted_formatted": "$12"
}
},
"weighted_values_total": {
"USD": {
"value": 12,
"count": 1,
"value_formatted": "$12"
}
},
"total_count": 1,
"total_currency_converted_value": 12,
"total_currency_converted_value_formatted": "$12"
},
"pagination": {
"start": 0,
"limit": 100,
"more_items_in_collection": false
}
},