To list all deal stages, the following permissions are required.

Deal permission: the user should have permission to manage deals.
Pipeline-specific permission: the user should have permission to manage the pipelines that the stages belong to. Stages that belong to pipelines that the user doesn't have permission to manage will not be returned in the response.

{
  "dealStages": [
    {
      "cardRegion1": "title",
      "cardRegion2": "next-action",
      "cardRegion3": "show-avatar",
      "cardRegion4": "contact-fullname-orgname",
      "cardRegion5": "value",
      "cdate": "2017-03-01T15:52:42-06:00",
      "color": "32B0FC",
      "dealOrder": "next-action DESC",
      "group": "4",
      "id": "15",
      "links": {
        "group": "/api/3/dealStages/15/group"
      },
      "order": "1",
      "title": "Initial Contact",
      "udate": "2017-03-01T15:52:42-06:00",
      "width": "280"
    },
    {
      "cardRegion1": "contact-orgname",
      "cardRegion2": "next-action",
      "cardRegion3": "hide-avatar",
      "cardRegion4": "contact-fullname-orgname",
      "cardRegion5": "value",
      "cdate": "2017-03-01T15:55:58-06:00",
      "color": "696969",
      "dealOrder": "title ASC",
      "group": "4",
      "id": "16",
      "links": {
        "group": "/api/3/dealStages/16/group"
      },
      "order": "1",
      "title": "Qualifications - Low",
      "udate": "2017-03-01T16:03:57-06:00",
      "width": "270"
    }
  ],
  "meta": {
    "total": "2"
  }
}