{
 "page": "https://prediction-market-use-cases.vercel.app/kalshi/stats/volume-by-year/",
 "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": {
  "by_year": [
   {
    "year": 2021,
    "markets": 1382,
    "contracts": 13481158,
    "never_traded": 14,
    "settled": 1382,
    "yes": 678
   },
   {
    "year": 2022,
    "markets": 14436,
    "contracts": 114599860,
    "never_traded": 1520,
    "settled": 14436,
    "yes": 3252
   },
   {
    "year": 2023,
    "markets": 34194,
    "contracts": 183661198,
    "never_traded": 11583,
    "settled": 34060,
    "yes": 7873
   },
   {
    "year": 2024,
    "markets": 468956,
    "contracts": 2380123799,
    "never_traded": 352528,
    "settled": 467140,
    "yes": 199691
   },
   {
    "year": 2025,
    "markets": 7163477,
    "contracts": 15347146459,
    "never_traded": 6389210,
    "settled": 6797368,
    "yes": 1534694
   }
  ],
  "trades_by_year": [
   [
    2021,
    153601,
    10360085
   ],
   [
    2022,
    1020519,
    76362139
   ],
   [
    2023,
    1710043,
    183143388
   ],
   [
    2024,
    5455173,
    1959096377
   ],
   [
    2025,
    63795405,
    16035911088
   ]
  ],
  "category_year_contracts": {
   "Climate and Weather": {
    "2021": 2675973,
    "2022": 9100801,
    "2023": 6936027,
    "2024": 93003563,
    "2025": 172464640
   },
   "Commodities": {
    "2024": 30957,
    "2025": 160814
   },
   "Companies": {
    "2023": 760342,
    "2024": 7789885,
    "2025": 2416840
   },
   "Crypto": {
    "2024": 164262646,
    "2025": 665505610
   },
   "Economics": {
    "2021": 1203136,
    "2022": 27788379,
    "2023": 34180702,
    "2024": 73778584,
    "2025": 378876544
   },
   "Elections": {
    "2024": 1563534569,
    "2025": 204694187
   },
   "Entertainment": {
    "2021": 649949,
    "2022": 734351,
    "2023": 2887979,
    "2024": 78631292,
    "2025": 161805079
   },
   "Exotics": {
    "2025": 216053957
   },
   "Financials": {
    "2022": 42424765,
    "2023": 35369821,
    "2024": 170911742,
    "2025": 169430644
   },
   "Health": {
    "2021": 3613737,
    "2022": 3033220,
    "2023": 119898,
    "2024": 1266756,
    "2025": 191017
   },
   "Mentions": {
    "2025": 114977256
   },
   "Politics": {
    "2021": 2779707,
    "2022": 5680198,
    "2023": 5661932,
    "2024": 203720997,
    "2025": 223140787
   },
   "Science and Technology": {
    "2021": 286431,
    "2022": 17711,
    "2023": 685441,
    "2024": 15142687,
    "2025": 21352989
   },
   "Sports": {
    "2024": 355827,
    "2025": 13011787905
   },
   "Transportation": {
    "2021": 756172,
    "2022": 645986,
    "2023": 204954,
    "2024": 783976,
    "2025": 144352
   },
   "World": {
    "2021": 1430463,
    "2022": 144580,
    "2023": 156275,
    "2024": 570024,
    "2025": 2601754
   }
  }
 }
}