curl --request GET \
  --url https://api.hubapi.com/marketing/emails/2026-03/statistics/histogram \
  --header 'Authorization: Bearer <token>'

{
  "results": [
    {
      "aggregations": {
        "counters": {},
        "deviceBreakdown": {},
        "qualifierStats": {},
        "ratios": {}
      },
      "interval": {
        "end": "2023-11-07T05:31:56Z",
        "start": "2023-11-07T05:31:56Z"
      }
    }
  ],
  "total": 123,
  "paging": {
    "next": {
      "after": "<string>",
      "link": "<string>"
    },
    "prev": {
      "before": "<string>",
      "link": "<string>"
    }
  }
}