curl --request GET \
  --url https://api.gcore.com/cloud/v1/availablefloatingips/{project_id}/{region_id} \
  --header 'Authorization: <api-key>'

{
  "count": 1,
  "results": [
    {
      "created_at": "2019-06-13T13:58:12+0000",
      "creator_task_id": "d1e1500b-e2be-40aa-9a4b-cc493fa1af30",
      "fixed_ip_address": "192.168.10.15",
      "floating_ip_address": "172.24.4.34",
      "id": "c64e5db1-5f1f-43ec-a8d9-5090df85b82d",
      "port_id": "ee2402d0-f0cd-4503-9b75-69be1d11c5f1",
      "project_id": 1337,
      "region": "Luxembourg 1",
      "region_id": 7,
      "router_id": "11005a33-c5ac-4c96-ab6f-8f2827cc7da6",
      "status": "ACTIVE",
      "tags": [
        {
          "key": "my-tag",
          "read_only": false,
          "value": "my-tag-value"
        }
      ],
      "task_id": "a4eb4b29-048e-42f6-a5e1-2c18bc001c45",
      "updated_at": "2019-06-13T13:58:12+0000"
    }
  ]
}