The api_quota_group relationship returns the group which the user consumes API quota from. This relationship is only visible to the account's owner and their group's admin.

This relationship can be retrieved by using the relationships API endpoint and contains a Group object.

{
  "data": <GROUP_OBJECT>,
  "links": {
    "next": "<string>",
    "self": "<string>"
  },
  "meta": {
    "count": <int>,
    "cursor": "<string>"
  }
}

{
    "data": {
        "attributes": {
            "auto_add_users": [],
            "country": "United States",
            "country_iso": "US",
            "domain_name": "blabla.com",
            "industry": "IT",
            "organization": "Company",
            "organization_legal_name": "Company Inc",
            "privileges": {
                "admin": {
                    "granted": false
                },
                "allinfo": {
                    "granted": false
                },
                "big-files": {
                    "expiration_date": 1601510400,
                    "granted": true
                },
                "cases": {
                    "granted": false
                },
                "click_to_accept": {
                    "granted": false
                }
            },
            "quota_usage_by_user": {},
            "quotas": {
                "api_requests_daily": {
                    "allowed": 1000,
                    "used": 13
                },
                "api_requests_hourly": {
                    "allowed": 60000,
                    "used": 1
                },
                "api_requests_monthly": {
                    "allowed": 30000,
                    "used": 104
                }
            }
        },
        "id": "blabla",
        "links": {
            "self": "https://www.virustotal.com/api/v3/groups/spellmans"
        },
        "type": "group"
    },
    "links": {
        "self": "https://www.virustotal.com/api/v3/users/spellman/api_quota_group"
    },
    "meta": {
        "count": 1
    }
}