{
 "page": "https://prediction-market-use-cases.vercel.app/kalshi/category/sports/",
 "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": 110530,
  "events": 16810,
  "nseries": 631,
  "vol": 13012143732,
  "zero": 19323,
  "settled": 97479,
  "yes": 35103,
  "no": 62376,
  "first": "2024-12-04",
  "last": "2025-11-23",
  "by_year": [
   {
    "year": 2024,
    "markets": 32,
    "contracts": 355827,
    "never_traded": 0,
    "settled": 31,
    "yes": 3
   },
   {
    "year": 2025,
    "markets": 110498,
    "contracts": 13011787905,
    "never_traded": 19323,
    "settled": 97448,
    "yes": 35100
   }
  ],
  "top_series": [
   {
    "series": "KXNFLGAME",
    "title": "NFL Game",
    "markets": 486,
    "contracts": 3017237118,
    "never_traded": 0
   },
   {
    "series": "KXNCAAFGAME",
    "title": "College Football Game",
    "markets": 1760,
    "contracts": 2799948915,
    "never_traded": 1
   },
   {
    "series": "KXNBAGAME",
    "title": "NBA Game",
    "markets": 784,
    "contracts": 1683773756,
    "never_traded": 6
   },
   {
    "series": "KXMLBGAME",
    "title": "Professional Baseball Game",
    "markets": 4428,
    "contracts": 865058318,
    "never_traded": 22
   },
   {
    "series": "KXATPMATCH",
    "title": "ATP Tennis Match",
    "markets": 2520,
    "contracts": 450159413,
    "never_traded": 40
   },
   {
    "series": "KXMARMAD",
    "title": "Men's College Basketball Tournament Champion",
    "markets": 488,
    "contracts": 415470990,
    "never_traded": 52
   },
   {
    "series": "KXNHLGAME",
    "title": "NHL Game",
    "markets": 1010,
    "contracts": 344058272,
    "never_traded": 1
   },
   {
    "series": "KXWTAMATCH",
    "title": "WTA Tennis Match",
    "markets": 2382,
    "contracts": 338563928,
    "never_traded": 12
   },
   {
    "series": "KXNFLSPREAD",
    "title": "Pro Football Spread",
    "markets": 5969,
    "contracts": 247733494,
    "never_traded": 3015
   },
   {
    "series": "KXPGATOUR",
    "title": "PGA Tour",
    "markets": 3942,
    "contracts": 230921414,
    "never_traded": 1032
   }
  ]
 }
}