{
  "version": "b2b-derivatives-join-example-1.0",
  "selection": "One BTCUSDT Binance USD-M settled funding event at 2026-08-31 16:00 UTC and the two immediately preceding five-minute OI observations. Selected to explain a join, not sampled to estimate returns or coverage.",
  "market": "Binance USD-M BTCUSDT perpetual",
  "time_unit": "UTC Unix seconds; funding source millisecond offset is retained",
  "rows": [
    {
      "kind": "open_interest",
      "event_time": 1788191700,
      "event_time_utc": "2026-08-31T15:55:00Z",
      "observed_at": 1789745877.6223824,
      "oi_quantity_btc": 107211.911,
      "oi_notional_usdt": 8420745125.673,
      "source_url": "https://data.binance.vision/data/futures/um/daily/metrics/BTCUSDT/BTCUSDT-metrics-2026-08-31.zip",
      "source_sha256": "3dc717a00452047e102387880347ebf0e48756a026878c73ea5e8965810c8bf0"
    },
    {
      "kind": "open_interest",
      "event_time": 1788192000,
      "event_time_utc": "2026-08-31T16:00:00Z",
      "observed_at": 1789745877.6223824,
      "oi_quantity_btc": 107256.046,
      "oi_notional_usdt": 8427086083.0108,
      "source_url": "https://data.binance.vision/data/futures/um/daily/metrics/BTCUSDT/BTCUSDT-metrics-2026-08-31.zip",
      "source_sha256": "3dc717a00452047e102387880347ebf0e48756a026878c73ea5e8965810c8bf0"
    },
    {
      "kind": "settled_funding",
      "event_time": 1788192000.001,
      "event_time_utc": "2026-08-31T16:00:00.001Z",
      "observed_at": 1789742032.3325386,
      "funding_rate_fraction": 0.0001,
      "funding_rate_pct_per_settlement": 0.01,
      "funding_interval_hours": 8,
      "source_url": "https://data.binance.vision/data/futures/um/monthly/fundingRate/BTCUSDT/BTCUSDT-fundingRate-2026-08.zip",
      "source_sha256": "7c108b3a02bd6dc7345ca7323e3a49664edcea0afdcf780ffb3b44762c45a964"
    }
  ],
  "derived": {
    "oi_quantity_change_btc": 44.135,
    "oi_quantity_change_pct": 0.04117,
    "funding_hourly_equivalent_pct": 0.00125,
    "historical_local_pit_eligible_at_event_time": false
  },
  "limitations": [
    "These rows were imported locally on 2026-09-18, after their 2026-08-31 source events. They do not show what CoinNudge knew at the historical decision time.",
    "The example does not estimate a strategy edge, funding P&L or venue-wide coverage. OI is not a directional long-versus-short measure."
  ]
}