Available parameters and response documentation is available here

GET /lookup/7-151945072--T?format=api
HTTP 200 OK
Allow: GET, HEAD, OPTIONS
Content-Type: application/json ;utf-8
ETag: "a33d9ff758b0d881ba19c17245e85e0c8a620ecfd5b9e2e7d951cd8e6a6f9a24"
Vary: Accept

{
  "chromosome": "chr7",
  "alt": "T",
  "ref": "",
  "pos": 151945072,
  "variant_id": "10190071519450720005",
  "variant_type": "Insertion",
  "cytobands": "7q36.1",
  "publications": {
    "publications": [],
    "genes": []
  }
}