{
"symbol": "SPY",
"snapshot_date": "string",
"underlier_price": 0,
"expiry": "string",
"atm_iv": 0,
"iv_call_25d": 0,
"iv_put_25d": 0,
"skew_25d": 0,
"call_25d_source": "string",
"put_25d_source": "string",
"contracts_used_calls": 0,
"contracts_used_puts": 0,
"dropped_unreliable_iv": 0,
"dropped_missing_delta": 0
}