{
 "page": "https://prediction-market-use-cases.vercel.app/kalshi/category/politics/",
 "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": 8053,
  "events": 1732,
  "nseries": 1144,
  "vol": 440983621,
  "zero": 805,
  "settled": 6570,
  "yes": 1534,
  "no": 5036,
  "first": "2021-07-26",
  "last": "2025-11-21",
  "by_year": [
   {
    "year": 2021,
    "markets": 68,
    "contracts": 2779707,
    "never_traded": 0,
    "settled": 68,
    "yes": 14
   },
   {
    "year": 2022,
    "markets": 780,
    "contracts": 5680198,
    "never_traded": 23,
    "settled": 780,
    "yes": 109
   },
   {
    "year": 2023,
    "markets": 1101,
    "contracts": 5661932,
    "never_traded": 92,
    "settled": 1100,
    "yes": 145
   },
   {
    "year": 2024,
    "markets": 2274,
    "contracts": 203720997,
    "never_traded": 149,
    "settled": 1974,
    "yes": 394
   },
   {
    "year": 2025,
    "markets": 3830,
    "contracts": 223140787,
    "never_traded": 541,
    "settled": 2648,
    "yes": 872
   }
  ],
  "top_series": [
   {
    "series": "KXGOVSHUTLENGTH",
    "title": "Number of days of government shutdown?",
    "markets": 66,
    "contracts": 82758196,
    "never_traded": 0
   },
   {
    "series": "KXSECAG",
    "title": "Next Attorney General",
    "markets": 18,
    "contracts": 12672827,
    "never_traded": 0
   },
   {
    "series": "KXSECDEF",
    "title": "New Secretary of Defense",
    "markets": 16,
    "contracts": 12461725,
    "never_traded": 0
   },
   {
    "series": "KXSECHHS",
    "title": "Next Secretary of Health and Human Services",
    "markets": 8,
    "contracts": 12146553,
    "never_traded": 0
   },
   {
    "series": "KXNOBELPEACE",
    "title": "Nobel Peace Prize",
    "markets": 34,
    "contracts": 12076482,
    "never_traded": 5
   },
   {
    "series": "KXBIDENPARDON",
    "title": "Biden pardon Hunter",
    "markets": 30,
    "contracts": 11480444,
    "never_traded": 0
   },
   {
    "series": "KXTRUMPPARDON",
    "title": "Trump pardons",
    "markets": 56,
    "contracts": 8608102,
    "never_traded": 1
   },
   {
    "series": "KXTRUMPOUT",
    "title": "Trump Out As President",
    "markets": 1,
    "contracts": 8382643,
    "never_traded": 0
   },
   {
    "series": "LEAVEPOWELL",
    "title": "Powell leaving",
    "markets": 6,
    "contracts": 7654168,
    "never_traded": 0
   },
   {
    "series": "KXEPSTEIN",
    "title": "Epstein documents",
    "markets": 7,
    "contracts": 7108381,
    "never_traded": 0
   }
  ]
 }
}