curl --request POST \
  --url https://api.gcore.com/cloud/v1/instances/{project_id}/{region_id}/available_flavors \
  --header 'Authorization: <api-key>' \
  --header 'Content-Type: application/json' \
  --data '{
  "volumes": [
    {
      "attachment_tag": "root",
      "boot_index": 0,
      "image_id": "f01fd9a0-9548-48ba-82dc-a8c8b2d6f2f1",
      "name": "TestVM5 Ubuntu boot image",
      "size": 10,
      "source": "image",
      "type_name": "ssd_hiiops"
    }
  ]
}'

{
  "count": 1,
  "results": [
    {
      "architecture": "x86_64",
      "capacity": 1,
      "currency_code": "USD",
      "disabled": false,
      "flavor_id": "g2-standard-32-64",
      "flavor_name": "g2-standard-32-64",
      "hardware_description": {},
      "os_type": "linux",
      "price_per_hour": 1,
      "price_per_month": 720,
      "price_status": "show",
      "ram": 2048,
      "vcpus": 1
    }
  ]
}