curl --request GET \
  --url https://api.tilt.io/api/v1/indexes/{index_id}/levels \
  --header 'X-Api-Key: <api-key>'

{
  "meta": {
    "index_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a"
  },
  "data": {
    "effective_date": "2023-12-25",
    "publish_datetime": "2023-11-07T05:31:56Z",
    "index_name": "<string>",
    "currency": "<string>",
    "return_type": "<string>",
    "index_level": "<string>",
    "index_market_cap": "<string>",
    "constituent_count": 123,
    "daily_return": "<string>",
    "one_year_return": "<string>",
    "five_year_return": "<string>"
  }
}