{
    "symbol": "SPY",
    "as_of": "2026-05-13T07:44:38.4139931Z",
    "expiry": null,
    "official_oi": 3507113,
    "simulated_oi": 3492532,
    "intraday_oi_delta": -14581,
    "oi_delta_confidence": 0.43,
    "effective_oi": 3503333,
    "contracts_total": 13576,
    "contracts_with_flow": 1225
}