curl --request GET \
  --url https://api.amberdata.com/markets/derivatives/analytics/volatility/open-interest/tradfi \
  --header 'x-api-key: <api-key>'

{
  "status": 200,
  "title": "OK",
  "description": "Successful request",
  "payload": {
    "data": [
      {
        "currency": "IBIT",
        "expirationTimestamp": "2025-05-02 00:00:00 000",
        "instrument": "IBIT-02MAY25-25-C",
        "instrumentNormalized": "TRADFI-IBIT-02MAY25-25-C",
        "openInterest": 23713,
        "putCall": "C",
        "strike": 25,
        "timestamp": "2025-04-30 00:00:00 000"
      },
      {
        "currency": "IBIT",
        "expirationTimestamp": "2025-05-02 00:00:00 000",
        "instrument": "IBIT-02MAY25-25-P",
        "instrumentNormalized": "TRADFI-IBIT-02MAY25-25-P",
        "openInterest": 12580,
        "putCall": "P",
        "strike": 25,
        "timestamp": "2025-04-30 00:00:00 000"
      }
    ]
  }
}