Contracts at their $1 face value; $26.4B in dollars actually paid. $3.5B in the last 24 hours.
Prediction Market Volume $105.7 billion in contracts traded in 30 days, and Kalshi handled 76% of it
Daily trading on DraftKings Predictions, Gemini, Kalshi, Novig, Polymarket, Polymarket US, ProphetX, Rothera and Underdog Exchange, by venue, category and market.
76%Kalshi
▲ 55%volume vs. prior 30 days
DraftKings Predictions 3%, Gemini under 1%, Novig 2%, Polymarket 4%, Polymarket US 12%, ProphetX under 1%, Rothera 1%, Underdog Exchange 1%.
$76M on Kalshi; next, Washington vs San Francisco: Spread at $20M.
Daily volume
Every day for the last 30
Volume per day, by venueSep 20-Oct 19, 2026
KalshiPolymarket USPolymarketDraftKings PredictionsNovigUnderdog ExchangeRotheraProphetXGemini
The data as a table (31 rows)
| Date | DraftKings Predictions | Gemini | Kalshi | Novig | Polymarket | Polymarket US | ProphetX | Rothera | Underdog Exchange | All venues |
|---|---|---|---|---|---|---|---|---|---|---|
| Oct 20, 2026 (so far) | $34M | $485K | $1.62B | $19M | $65M | $121M | – | – | $13M | $1.87B |
| Oct 19, 2026 | $94M | $815K | $2.24B | $71M | $110M | $363M | $6.8M | $27M | $30M | $2.94B |
| Oct 18, 2026 | $340M | $2.2M | $4.47B | $207M | $210M | $645M | $17M | $99M | $114M | $6.10B |
| Oct 17, 2026 | $231M | $1.7M | $4.15B | $138M | $182M | $707M | $14M | $7M | $99M | $5.53B |
| Oct 16, 2026 | $104M | $1.1M | $2.55B | $74M | $142M | $378M | $9.8M | $40M | $44M | $3.34B |
| Oct 15, 2026 | $132M | $883K | $2.79B | $93M | $153M | $467M | $9.7M | $23M | $38M | $3.70B |
| Oct 14, 2026 | $71M | $917K | $2.57B | $66M | $155M | $442M | $8.2M | $15M | $32M | $3.36B |
| Oct 13, 2026 | $69M | $1.1M | $2.82B | $80M | $147M | $329M | $8.9M | $43M | $37M | $3.53B |
| Oct 12, 2026 | $89M | $989K | $2.17B | $85M | $120M | $334M | $7.6M | $47M | $31M | $2.89B |
| Oct 11, 2026 | $228M | $2.5M | $4.20B | $190M | $184M | $640M | $15M | $106M | $111M | $5.68B |
| Oct 10, 2026 | $158M | $1.3M | $3.68B | $142M | $162M | $581M | $15M | $8.6M | $90M | $4.84B |
| Oct 9, 2026 | $76M | $920K | $2.55B | $75M | $136M | $347M | $9.1M | $36M | $48M | $3.28B |
| Oct 8, 2026 | $82M | $1.1M | $2.11B | $77M | $122M | $360M | $8.7M | $25M | $41M | $2.83B |
| Oct 7, 2026 | $61M | $1.1M | $2.09B | $65M | $114M | $305M | $6.9M | $28M | $40M | $2.71B |
| Oct 6, 2026 | $54M | $1.1M | $2.24B | $57M | $145M | $294M | $6.4M | $32M | $31M | $2.87B |
| Oct 5, 2026 | $74M | $1.2M | $2.15B | $64M | $143M | $300M | $7.7M | $38M | $27M | $2.81B |
| Oct 4, 2026 | $224M | $2.3M | $3.89B | $167M | $223M | $594M | $15M | $99M | $96M | $5.31B |
| Oct 3, 2026 | $142M | $1.7M | $3.24B | $117M | $175M | $502M | $13M | $12M | $85M | $4.29B |
| Oct 2, 2026 | $67M | $1.4M | $2.60B | $58M | $141M | $317M | $8.2M | $29M | $35M | $3.26B |
| Oct 1, 2026 | $59M | $928K | $2.30B | $55M | $135M | $343M | $6.6M | $20M | $31M | $2.95B |
| Sep 30, 2026 | $47M | $965K | $2.03B | $46M | $120M | $309M | $5.6M | $29M | $26M | $2.62B |
| Sep 29, 2026 | $47M | $1.2M | $2.28B | $43M | $131M | $339M | $5.2M | $39M | $23M | $2.91B |
| Sep 28, 2026 | $63M | $1.2M | $2.01B | $40M | $130M | $312M | $6.2M | $37M | $14M | $2.62B |
| Sep 27, 2026 | $200M | $2.3M | $3.24B | $115M | $199M | $639M | $17M | $105M | $60M | $4.58B |
| Sep 26, 2026 | $131M | $2.5M | $2.90B | $89M | $161M | $614M | $12M | $20M | $49M | $3.98B |
| Sep 25, 2026 | $65M | $1.6M | $2.46B | $55M | $138M | $363M | $8.5M | $38M | $24M | $3.16B |
| Sep 24, 2026 | $60M | $1.2M | $1.99B | $55M | $138M | $355M | $8.7M | $29M | $17M | $2.66B |
| Sep 23, 2026 | $44M | $1.1M | $1.81B | $44M | $113M | $307M | $6.7M | $29M | $16M | $2.38B |
| Sep 22, 2026 | $43M | $1.2M | $1.80B | $39M | $133M | $289M | $4.8M | $29M | $14M | $2.36B |
| Sep 21, 2026 | $59M | $1.3M | $1.45B | $32M | $129M | $265M | $6.2M | $37M | $6.4M | $1.98B |
| Sep 20, 2026 | $178M | $2.6M | $3.17B | $96M | $249M | $526M | $19M | $89M | $55M | $4.38B |
Kalshi$80.0B in 30 days76% share · +55% vs. prior 30 daysKalshi volume charts →Polymarket US$12.6B in 30 days12% share · +114% vs. prior 30 daysPolymarket US volume charts →Polymarket$4.5B in 30 days4% share · -8% vs. prior 30 daysPolymarket volume charts →DraftKings Predictions$3.3B in 30 days3% share · +145% vs. prior 30 daysDraftKings Predictions volume charts →Novig$2.5B in 30 days2% share · +137% vs. prior 30 daysNovig volume charts →Underdog Exchange$1.4B in 30 days1% share · +134% vs. prior 30 daysUnderdog Exchange volume charts →Rothera$1.2B in 30 days1% share · +36% vs. prior 30 daysRothera volume charts →ProphetX$295M in 30 days0.3% share · +49% vs. prior 30 daysProphetX volume charts →Gemini$42M in 30 days0.0% share · +2% vs. prior 30 daysGemini volume charts →
| Sources | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Kalshi | $80.0B | +55% | 75.6% | $18.6B | 70.4% | 23¢ | $1.4B | 416.6M | Sources› |
| Polymarket US | $12.6B | +114% | 11.9% | $3.3B | 12.6% | 27¢ | $86M | 7.3M | |
| Polymarket | $4.5B | -8% | 4.3% | $2.3B | 8.7% | 50¢ | $360M | 41.2M | |
| DraftKings Predictions | $3.3B | +145% | 3.1% | $644M | 2.4% | 20¢ | – | 17.3M | |
| Novig | $2.5B | +137% | 2.4% | $708M | 2.7% | 28¢ | – | 7.7M | |
| Underdog Exchange | $1.4B | +134% | 1.3% | $221M | 0.8% | 16¢ | – | 6.6M | |
| RotheraData through Oct 18 | $1.2B | +36% | 1.1% | $593M | 2.3% | 49¢ | – | 3.2M | |
| ProphetX | $295M | +49% | 0.3% | – | – | – | – | – | |
| Gemini | $42M | +2% | 0.0% | – | – | – | – | – |
Source: DraftKings Predictions / Gemini / Kalshi / Novig / Polymarket / Polymarket US / ProphetX / Rothera / Underdog Exchange via DeFi Rate, as of .
Analysis
By the numbers
The figures to quote: the last month and week against the ones before, where the money goes, and who’s growing. Each is like for like: a venue counts only where our data covers both periods.
Traded in September 2026$79.6B ▲ 56%
Change from August, like for like: DraftKings Predictions, Gemini, Kalshi, Polymarket, Polymarket US, ProphetX, Rothera and Underdog Exchange, the venues our data covers for both whole months. The total includes Novig, whose figures here start partway through August.
Week of Oct 12$28.5B ▲ 14%
Monday to Sunday, UTC, the last whole week; the change is on the week before.
Money on sports, 30 days68%
$13.8B of the dollars paid on single markets went on sports; next, crypto (26%) and finance (3%). Parlays, mostly sports too, aren’t counted.
Fastest growing venueDraftKings Predictions ▲ 145%
Its last 30 days against the 30 before (Aug 21-Sep 19, 2026): the biggest rise of any venue with a whole 30 days before.
Share of volume by weekWeeks of Aug 24 to Oct 12
DraftKings PredictionsGeminiKalshiNovigPolymarketPolymarket USProphetXRotheraUnderdog Exchange
The average day, by weekday8 whole weeks
All venues together, contracts at $1, UTC days. Football weekends lift Saturday and Sunday. The busiest day of the last 60 was Sunday, Oct 18, 2026: $6.1B.
What’s trading
Categories and the biggest markets
13 rows shown
| Sports | $35.0B | +35% |
|---|---|---|
| Crypto | $11.4B | +19% |
| Sports | $8.9B | +9% |
| Crypto | $2.8B | +9% |
| Finance | $1.2B | +224% |
| Sports | $1.1B | -39% |
| Other | $794M | – |
| Politics | $598M | +36% |
| Crypto | $414M | +13% |
| Finance | $334M | +12% |
| Weather | $226M | +22% |
| World | $161M | +46% |
| Politics | $152M | +2% |
| Economics | $144M | -63% |
| Mentions | $84M | +17% |
| Culture | $76M | -11% |
| Tech | $72M | +55% |
| Finance | $61M | +77% |
| Weather | $53M | +1% |
| Economics | $49M | +75% |
| Other | $40M | – |
| Politics | $27M | +17% |
| World | $22M | -35% |
| Tech | $22M | +60% |
| Mentions | $21M | -9% |
| Culture | $16M | +8% |
| Weather | $6.9M | +24% |
| Economics | $5.8M | -27% |
| Mentions | $3.5M | +62% |
| Companies | $3.2M | -55% |
| World | $2.8M | -20% |
| Culture | $2.5M | +33% |
| Tech | $1.4M | -26% |
| Companies | $785K | +52% |
| Other | $522K | – |
| Health | $268K | +174% |
| Companies | $70K | -66% |
| Health | $35K | -75% |
| Health | $5K | +132% |
Combos, not ranked: multi-leg parlays, $161M paid in 24 hours, $1.7B paid in 7 days, $5.6B paid in 30 days. Each leg sells for a few cents, so counted in contracts at $1 like the categories above they’d top them all.
12 rows shown
| BUF Bills vs LA RamsKalshi · Sports | $104M | |
|---|---|---|
| BAL Ravens vs ATL FalconsKalshi · Sports | $84M | |
| WAS Commanders vs SF 49ersKalshi · Sports | $79M | |
| SEA Seahawks vs DEN BroncosKalshi · Sports | $79M | |
| WAS Commanders vs SF 49ersKalshi · Sports | $79M | |
| SEA Seahawks vs DEN BroncosKalshi · Sports | $78M | |
| IND Colts vs KC ChiefsKalshi · Sports | $76M | |
| WAS Commanders vs SF 49ersKalshi · Sports | $76M | |
| Los Angeles R vs DenverKalshi · Sports | $76M | |
| Philadelphia vs ChicagoKalshi · Sports | $76M | |
| DAL Cowboys vs GB PackersKalshi · Sports | $72M | |
| DAL Cowboys vs GB PackersKalshi · Sports | $72M | |
| TB Buccaneers vs DAL CowboysKalshi · Sports | $69M | |
| PIT Steelers vs CLE BrownsKalshi · Sports | $67M | |
| DET Lions vs CAR PanthersKalshi · Sports | $52M | |
| SF 49ers vs SEA SeahawksKalshi · Sports | $48M | |
| Notre Dame vs BYUKalshi · Sports | $36M | |
| ARI Cardinals vs LA RamsKalshi · Sports | $35M | |
| BUF Bills vs LV RaidersKalshi · Sports | $34M | |
| Game 3: Milwaukee vs Los Angeles DKalshi · Sports | $34M | |
| NFL: BUF @ LAR, Oct 12 2026Rothera · Sports | $33M | |
| Ohio St. vs IndianaKalshi · Sports | $31M | |
| HOU Texans vs JAC JaguarsKalshi · Sports | $30M | |
| Game 4: Milwaukee vs Los Angeles DKalshi · Sports | $30M | |
| Nebraska vs OregonKalshi · Sports | $29M | |
| Washington vs San Francisco: SpreadKalshi · Sports | $20M | |
| WAS Commanders vs. SF 49ersPolymarket US · Sports | $17M | |
| Game 6: Cleveland vs Tampa BayKalshi · Sports | $15M | |
| NFL: HOU @ JAX, Oct 18 2026Rothera · Sports | $14M | |
| NFL: BUF @ LV, Oct 18 2026Rothera · Sports | $12M | |
| NFL-01OB0Q5EVVN3HU8DraftKings Predictions · Sports | $12M | |
| NFL: ARI @ LAR, Oct 18 2026Rothera · Sports | $11M | |
| Washington Commanders @ San Francisco 49ersNovig · Sports | $10M | |
| Washington vs San Francisco: TouchdownsKalshi · Sports | $10M | |
| Commanders vs. 49ersPolymarket · Sports | $9.6M | |
| NFL: PIT @ TB, Oct 18 2026Rothera · Sports | $8.7M | |
Source: DraftKings Predictions / Gemini / Kalshi / Novig / Polymarket / Polymarket US / ProphetX / Rothera / Underdog Exchange via DeFi Rate, as of .
Explanation
How we measure prediction market volume
What volume tells you
Volume on this page counts contracts traded at their $1 face value: a contract that pays $1 if it’s right adds $1, whatever it cost. That’s the measure the exchanges headline themselves, so our figures line up with what Kalshi reports. Dollars paid is what traders actually spent, each contract at its price: a 20¢ contract adds $1 to volume and 20¢ to dollars paid. The venue table shows both, and “By the numbers” gives the average price paid per contract.
High volume usually means tighter prices and more contracts available at the quoted price, but it isn’t the same as depth: a market can trade heavily in a burst and still have a thin order book. Open interest, the value of contracts still held, says how much money is waiting on outcomes rather than how much changed hands.
What’s driving volume
Prediction markets traded $105.7B in contracts over the last 30 days. Kalshi handled 76% of it, and its volume moved +55% against the 30 days before.
Sports carry most of the volume, and football weekends show in the average day by weekday above. Short-dated crypto markets add a lot of contracts too: Kalshi’s 15-minute markets settle 96 times a day, so the same money trades again and again. Parlays (combos) are counted in volume but kept out of the category ranking, because each leg sells for a few cents and, at $1 a contract, they’d top every category.
On October 3, 2026 the page added three CFTC-regulated exchanges: ProphetX, Rothera and Underdog Exchange. Our data on each starts later than the exchange itself, so its arrival isn’t growth: the venue pages say where each one’s figures begin.
Using these figures
- Say which measure you quote. “$X in contracts” compares with the exchanges’ own announcements; “$X in dollars paid” is money actually spent. They can differ several times over.
- Days are UTC. The latest day on the chart is partial until it ends, and ProphetX, Rothera, Underdog Exchange and Novig publish each day’s trades a day or two later, so their latest days fill in after the others’.
- Cite a snapshot. Every chart and table has a Cite button that copies the figure with its source and a permanent link to the data as it stood, plus CSV downloads.
- Polymarket is two venues. Polymarket US is a CFTC-regulated exchange; Polymarket’s international exchange isn’t open to US traders. We count them separately.
For custom cuts of this data, use the data request form.
Methodology
Volume counts contracts traded at their $1 face value, the venues’ own headline measure, from DeFi Rate’s market data; the dollars actually paid for them are shown beside it where we have them. The 30-day window is Sep 20-Oct 19, 2026; changes compare with Aug 21-Sep 19, 2026. Polymarket’s international exchange and Polymarket US are counted separately.
Full methodology
DefinitionVolume counts contracts traded at their $1 face value, the venues’ own headline measure; the dollars actually paid are shown beside it.
Windows30-day figures compare with the 30 days before; the latest day is partial until it closes.
VenuesKalshi, Polymarket’s international exchange and Polymarket US are counted separately.
CategoriesCategories use each venue’s own market labels, grouped by our data provider.
Data and sources
- Source records for every number on this page: contracts, quote types, calculations and history
- DeFi Rate prediction-market methodology: how we price, average and label every figure
- Permanent snapshot, Oct 20, 9:30 AM ET: a frozen copy for citation
- Daily volume by venue, USD (CSV)
- Venues, 30 days (CSV)
- Volume by category (CSV)
- Most traded markets (CSV)
- Every figure and contract on this page (CSV)
Questions
What is the biggest prediction market by volume?
Kalshi, with about 76% of volume ($80.0 billion) over Sep 20-Oct 19, 2026. Polymarket US was second at about 12%.
How much is traded on prediction markets?
About $105.7 billion in 30 days and $3550 million in the last 24 hours.
What do people trade most?
Sports, then crypto. Politics is a small share outside election season.
About the authors
Pat Evans has covered complex industries for nearly two decades, including sports betting, sports business and, at iGaming Business, prediction markets, before joining DeFi Rate in 2026.
Cheryle Shepstone is DeFi Rate’s Director of Content and Strategy and oversees its prediction-market research, platform reviews and editorial methodology.
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