prediction neg risk arbitrage derived

{
  "input": {
    "type": "http",
    "method": "GET",
    "queryParams": {
      "event_slug": "presidential-election-winner-2028"
    }
  },
  "output": {
    "type": "json",
    "example": {
      "notice": "*_capacity_shares is how many full baskets (1 share of every outcome) you could execute right now within max_slippage_pct of each leg's best price - arbitrage_viable=false with a positive edge usually means the edge is real but too thin to size meaningfully. *_capacity_notional_usd prices that capacity at each leg's top-of-book price, which is optimistic for any size beyond the first price level - *_capacity_vwap_notional_usd instead prices it by walking the same depth used to compute capacity_shares, so it reflects the actual average cost of filling that size (null if depth data was insufficient). oldest_book_snapshot_time is the staleness bottleneck across all legs. Cross-check the specific leg you intend to trade with prediction.exit_capacity_audit before sizing a real position.",
      "event_slug": "presidential-election-winner-2028",
      "data_source": "polymarket-gamma+clob",
      "opportunity": "buy_basket",
      "generated_at": {
        "kst": "2026-09-08 21:00:00 KST",
        "utc": "2026-09-08T12:00:00Z"
      },
      "num_outcomes": 5,
      "basket_ask_sum": 0.94,
      "basket_bid_sum": 0.88,
      "arbitrage_viable": true,
      "buy_basket_net_edge_usd": 0.045,
      "sell_basket_net_edge_usd": -0.135,
      "buy_basket_gross_edge_usd": 0.06,
      "oldest_book_snapshot_time": {
        "kst": "2026-09-08 20:59:58 KST",
        "utc": "2026-09-08T11:59:58Z"
      },
      "buy_basket_capacity_shares": 42,
      "sell_basket_gross_edge_usd": -0.12,
      "assumed_round_trip_cost_pct": 1.5,
      "sell_basket_capacity_shares": 0,
      "buy_basket_capacity_notional_usd": 39.48,
      "sell_basket_capacity_notional_usd": 0,
      "buy_basket_capacity_vwap_notional_usd": 39.71,
      "sell_basket_capacity_vwap_notional_usd": null
    }
  }
}