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: "5e58ae49624eb4db7c55895ed5a2ff7c8949597cb9d538f590bf624fc477240a"
Vary: Accept

{
  "chromosome": "chr7",
  "alt": "T",
  "ref": "",
  "pos": 151945072,
  "variant_id": "10190071519450720005",
  "variant_type": "Insertion",
  "cytobands": "7q36.1",
  "publication_counts": null
}