curl -i 'https://vestibule.mx.com/users/USR-743e5d7f-1116-28fa-5de1-d3ba02e41d8d/holdings/HOL-d65683e8-9eab-26bb-bcfd-ced159c9abe2' \  -H 'Accept: application/vnd.mx.atrium.v1+json' \  -H 'MX-API-Key: {mx_api_key}' \  -H 'MX-Client-ID: {mx_client_id}'

{
  "holding": {
    "account_guid": "HOL-d65683e8-9eab-26bb-bcfd-ced159c9abe2",
    "cost_basis": 827,
    "created_at": "2015-04-13T12:01:23-06:00",
    "currency_code": "USD",
    "cusip": "18383M878",
    "daily_change": 2.5,
    "description": "Guggenheim Defensive Equity ETF",
    "guid": "HOL-d65683e8-9eab-26bb-bcfd-ced159c9abe2",
    "holding_type": "MONEY_MARKET",
    "market_value": 989.5,
    "member_guid": "MBR-d65683e8-9eab-26bb-bcfd-ced159c9abe",
    "purchase_price": 26.3,
    "shares": 6,
    "symbol": "DEF",
    "updated_at": "2015-04-13T12:01:23-06:00",
    "user_guid": "USR-743e5d7f-1116-28fa-5de1-d3ba02e41d8d"
  }
}