curl --request GET \
  --url https://ebn.telemetree.io/public-api/sessions/average \
  --header 'x-api-key: <api-key>'

{
  "xValues": {
    "name": "<string>",
    "data_type": "time_series",
    "data": [
      "<string>"
    ],
    "length": 123,
    "key_value": 123,
    "empty": false
  },
  "yValues": [
    {
      "name": "<string>",
      "data_type": "time_series",
      "data": [
        123
      ],
      "length": 123,
      "key_value": 123,
      "empty": false,
      "change": 123
    }
  ]
}