curl --request GET \
  --url https://mmapi.55-tech.com/api/v1/positions/summary \
  --header 'X-API-Key: <api-key>'

{
  "total_orders": 123,
  "fixture_count": 123,
  "exchange_count": 123,
  "total_stake": 123,
  "total_matched": 123,
  "total_open": 123,
  "filled_count": 123,
  "cancelled_count": 123,
  "open_count": 123
}