By default, deal stages for the pipelines are also returned in the response.
{
  "dealGroups": [
    {
      "allgroups": "1",
      "allusers": "1",
      "autoassign": "1",
      "cdate": "2017-01-16T14:51:57-06:00",
      "currency": "usd",
      "id": "1",
      "links": {
        "dealGroupGroups": "/api/3/dealGroups/1/dealGroupGroups",
        "dealGroupUsers": "/api/3/dealGroups/1/dealGroupUsers",
        "stages": "/api/3/dealGroups/1/stages"
      },
      "stages": [
        "1",
        "2"
      ],
      "title": "Pipeline A",
      "udate": "2017-03-01T11:06:32-06:00"
    },
    {
      "allgroups": "1",
      "allusers": "1",
      "autoassign": "0",
      "cdate": "2017-03-01T14:45:16-06:00",
      "currency": "usd",
      "id": "5",
      "links": {
        "dealGroupGroups": "/api/3/dealGroups/5/dealGroupGroups",
        "dealGroupUsers": "/api/3/dealGroups/5/dealGroupUsers",
        "stages": "/api/3/dealGroups/5/stages"
      },
      "stages": [
        "12",
        "13",
        "14"
      ],
      "title": "Pipeline Yesterday",
      "udate": "2017-03-01T15:07:18-06:00"
    }
  ],
  "dealStages": [
    {
      "cardRegion1": "title",
      "cardRegion2": "next-action",
      "cardRegion3": "show-avatar",
      "cardRegion4": "contact-fullname-orgname",
      "cardRegion5": "value",
      "cdate": "2017-01-20T09:27:32-06:00",
      "color": "C481DF",
      "dealOrder": "next-action DESC",
      "group": "1",
      "id": "1",
      "links": {
        "group": "/api/3/dealStages/1/group"
      },
      "order": "1",
      "title": "Stage 1",
      "udate": "2017-03-01T11:06:14-06:00",
      "width": "280"
    },
    {
      "cardRegion1": "title",
      "cardRegion2": "next-action",
      "cardRegion3": "show-avatar",
      "cardRegion4": "contact-fullname-orgname",
      "cardRegion5": "value",
      "cdate": "2017-01-20T09:27:34-06:00",
      "color": "00ECC5",
      "dealOrder": "next-action DESC",
      "group": "1",
      "id": "2",
      "links": {
        "group": "/api/3/dealStages/2/group"
      },
      "order": "2",
      "title": "Stage 2",
      "udate": "2017-03-01T11:06:20-06:00",
      "width": "280"
    },
    {
      "cardRegion1": "title",
      "cardRegion2": "next-action",
      "cardRegion3": "show-avatar",
      "cardRegion4": "contact-fullname-orgname",
      "cardRegion5": "value",
      "cdate": null,
      "color": "18D499",
      "dealOrder": "next-action DESC",
      "group": "5",
      "id": "12",
      "links": {
        "group": "/api/3/dealStages/12/group"
      },
      "order": "1",
      "title": "To Contact",
      "udate": null,
      "width": "280"
    },
    {
      "cardRegion1": "title",
      "cardRegion2": "next-action",
      "cardRegion3": "show-avatar",
      "cardRegion4": "contact-fullname-orgname",
      "cardRegion5": "value",
      "cdate": null,
      "color": "32B0FC",
      "dealOrder": "next-action DESC",
      "group": "5",
      "id": "13",
      "links": {
        "group": "/api/3/dealStages/13/group"
      },
      "order": "2",
      "title": "In Contact",
      "udate": null,
      "width": "280"
    },
    {
      "cardRegion1": "title",
      "cardRegion2": "next-action",
      "cardRegion3": "show-avatar",
      "cardRegion4": "contact-fullname-orgname",
      "cardRegion5": "value",
      "cdate": null,
      "color": "E6CE4B",
      "dealOrder": "next-action DESC",
      "group": "5",
      "id": "14",
      "links": {
        "group": "/api/3/dealStages/14/group"
      },
      "order": "3",
      "title": "Follow Up",
      "udate": null,
      "width": "280"
    }
  ],
  "meta": {
    "total": "2"
  }
}