{
 "page": "https://prediction-market-use-cases.vercel.app/kalshi/category/financials/",
 "source": "Becker Kalshi dataset (github.com/Jon-Becker/prediction-market-analysis); categories from Kalshi public API GET /trade-api/v2/series fetched 2026-10-17",
 "snapshot": "2026-10-17",
 "units": {
  "contracts": "sum of markets.volume (contracts, not dollars)"
 },
 "data": {
  "markets": 1654098,
  "events": 15676,
  "nseries": 209,
  "vol": 418136972,
  "zero": 1523502,
  "settled": 1641217,
  "yes": 820814,
  "no": 820403,
  "first": "2022-01-26",
  "last": "2025-11-22",
  "by_year": [
   {
    "year": 2022,
    "markets": 4787,
    "contracts": 42424765,
    "never_traded": 654,
    "settled": 4787,
    "yes": 639
   },
   {
    "year": 2023,
    "markets": 16243,
    "contracts": 35369821,
    "never_traded": 7559,
    "settled": 16152,
    "yes": 3467
   },
   {
    "year": 2024,
    "markets": 352834,
    "contracts": 170911742,
    "never_traded": 280896,
    "settled": 352285,
    "yes": 169696
   },
   {
    "year": 2025,
    "markets": 1280234,
    "contracts": 169430644,
    "never_traded": 1234393,
    "settled": 1267993,
    "yes": 647012
   }
  ],
  "top_series": [
   {
    "series": "KXINXU",
    "title": "S&P 500 above/below",
    "markets": 435308,
    "contracts": 94622515,
    "never_traded": 417415
   },
   {
    "series": "KXNASDAQ100U",
    "title": "Nasdaq above/below",
    "markets": 435237,
    "contracts": 53285362,
    "never_traded": 410823
   },
   {
    "series": "INX",
    "title": "S&P 500 range",
    "markets": 3296,
    "contracts": 47059925,
    "never_traded": 750
   },
   {
    "series": "NASDAQ100",
    "title": "Nasdaq range",
    "markets": 3327,
    "contracts": 31927396,
    "never_traded": 726
   },
   {
    "series": "NASDAQ100Y",
    "title": "Nasdaq yearly range",
    "markets": 45,
    "contracts": 28060766,
    "never_traded": 0
   },
   {
    "series": "INXU",
    "title": "S&P 500 above/below",
    "markets": 3890,
    "contracts": 24979576,
    "never_traded": 1422
   },
   {
    "series": "INXY",
    "title": "S&P 500 yearly range",
    "markets": 45,
    "contracts": 17580205,
    "never_traded": 15
   },
   {
    "series": "KXINX",
    "title": "S&P 500 range",
    "markets": 8250,
    "contracts": 16673409,
    "never_traded": 5441
   },
   {
    "series": "NASDAQ100U",
    "title": "Nasdaq above/below",
    "markets": 3893,
    "contracts": 14065659,
    "never_traded": 1449
   },
   {
    "series": "INXW",
    "title": "S&P 500 range",
    "markets": 1165,
    "contracts": 12210340,
    "never_traded": 140
   }
  ]
 }
}