{
 "page": "https://prediction-market-use-cases.vercel.app/kalshi/category/science-and-technology/",
 "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": 810,
  "events": 247,
  "nseries": 160,
  "vol": 37485259,
  "zero": 87,
  "settled": 469,
  "yes": 171,
  "no": 298,
  "first": "2021-10-18",
  "last": "2025-11-18",
  "by_year": [
   {
    "year": 2021,
    "markets": 17,
    "contracts": 286431,
    "never_traded": 0,
    "settled": 17,
    "yes": 10
   },
   {
    "year": 2022,
    "markets": 6,
    "contracts": 17711,
    "never_traded": 0,
    "settled": 6,
    "yes": 5
   },
   {
    "year": 2023,
    "markets": 21,
    "contracts": 685441,
    "never_traded": 1,
    "settled": 20,
    "yes": 4
   },
   {
    "year": 2024,
    "markets": 215,
    "contracts": 15142687,
    "never_traded": 4,
    "settled": 148,
    "yes": 75
   },
   {
    "year": 2025,
    "markets": 551,
    "contracts": 21352989,
    "never_traded": 82,
    "settled": 278,
    "yes": 77
   }
  ],
  "top_series": [
   {
    "series": "KXLLM1",
    "title": "Year-end top LLM",
    "markets": 125,
    "contracts": 15937266,
    "never_traded": 60
   },
   {
    "series": "KXTOPMODEL",
    "title": "Top model",
    "markets": 74,
    "contracts": 3086258,
    "never_traded": 1
   },
   {
    "series": "KXSPACEXSTARSHIP",
    "title": "SpaceX Starship launch",
    "markets": 47,
    "contracts": 2251909,
    "never_traded": 0
   },
   {
    "series": "KXALIENS",
    "title": "Aliens",
    "markets": 1,
    "contracts": 1886612,
    "never_traded": 0
   },
   {
    "series": "KXUFSD",
    "title": "Unsupervised full self-driving Tesla",
    "markets": 10,
    "contracts": 1798253,
    "never_traded": 0
   },
   {
    "series": "LLM1",
    "title": "Year-end top LLM",
    "markets": 8,
    "contracts": 1319352,
    "never_traded": 0
   },
   {
    "series": "KXWAYMOCITIES",
    "title": "Waymo cities",
    "markets": 14,
    "contracts": 1001694,
    "never_traded": 0
   },
   {
    "series": "KXCODINGMODEL",
    "title": "Best AI coding model",
    "markets": 14,
    "contracts": 856753,
    "never_traded": 1
   },
   {
    "series": "KXMEASLES",
    "title": "Measles cases",
    "markets": 23,
    "contracts": 778105,
    "never_traded": 1
   },
   {
    "series": "KXTOPAI",
    "title": "Top-ranked AI",
    "markets": 21,
    "contracts": 694553,
    "never_traded": 0
   }
  ]
 }
}