Kalshi Hits Record $19 Billion Week As Polymarket US Triples Fall Trade Volume
Kalshi‘s weekly contract volume climbed to $19.03 billion for Oct. 5-11, 2026, the very best of the six weekly totals reviewed.
Polymarket US rebounded to 2.82 billion in reported Trade Volume, whereas Polymarket recorded $498.81 million in cash-dollar quantity.
Weekend buying and selling accounted for a big share of exercise. Kalshi’s contract quantity rose throughout the six-week collection, whereas Polymarket US recovered from the earlier week’s decline. The venue-wide totals do not present how a lot of the rise got here from NFL or faculty soccer.
Top-line efficiency
Kalshi recorded $19.03 billion in weekly contract quantity from Oct. 5-11, up 3.57% from the previous week. Polymarket US reported 2.82 billion in Trade Volume, up 4.25% from 2.71 billion the week earlier than. Polymarket recorded $498.81 million in cash-dollar quantity, down 3.89% from $519.01 million the earlier week.
These figures use totally different reporting strategies. Kalshi’s headline is $1-face-value contract quantity; Polymarket US makes use of the venue-native Trade Volume area from its Daily Market Reports; and Polymarket makes use of taker-side cash-dollar quantity. Polymarket US’s reported amount just isn’t handled as cash-dollar turnover. The figures shouldn’t be added right into a mixed trade whole.
Kalshi reaches the very best whole within the six-week collection
Kalshi’s $19.03 billion in weekly contract volume was its highest whole throughout the six accomplished weeks reviewed. That determine represents contracts counted at $1 face worth, moderately than execution-price money turnover.
Our aggregation recorded $4.42 billion in Kalshi execution-price greenback quantity and counted 97.91 million commerce executions. The execution depend was the very best within the six-week collection reviewed. These supporting aggregation measures haven’t been independently reconciled to the venue’s cash-turnover or execution-count collection.
Sunday, Oct. 11, was Kalshi’s busiest day in our day by day aggregation, with $4.20 billion in contract quantity and $951.50 million on the supporting execution-price greenback measure. Sunday accounted for 22.09% of the week’s contract quantity.
Saturday recorded $3.68 billion in contract quantity and $767.64 million on the supporting execution-price greenback measure. Together, Saturday and Sunday accounted for 41.44% of Kalshi’s weekly contract quantity. Activity was stronger over the weekend than on any particular person weekday.
Weekend buying and selling and the Polymarket US CAOC subset
Daily buying and selling totals peaked over the weekend, however neither these totals nor unresolved multi-outcome markets present a verified NFL or college-football breakdown.
Polymarket US’s venue-labeled Combinatoric Athletic Outcome Contracts (CAOC) household accounted for a considerable share of reported exercise. It is a non-additive subset of the platform’s whole, not a separate quantity whole or a verified breakdown of all combos by league.
Polymarket US sees a serious Sunday surge
Polymarket US reported 698.83 million in Trade Volume for the Sunday, Oct. 11, Business Date, its busiest reported day of the week.
Reported daily Trade Volume elevated from 289.63 million on Wednesday to 404.82 million on Friday and 476.48 million on Saturday earlier than reaching Sunday’s peak.
The CAOC-labeled household generated 1.45 billion in reported Trade Volume for the week, representing 51.52% of Polymarket US’s whole.
On Sunday, CAOC-labeled Trade Volume reached 420.54 million, or 60.18% of the platform’s reported day by day whole. These figures don’t allocate combo quantity to NFL, faculty soccer or different leagues.
Polymarket rebounds over the weekend
Polymarket skilled a midweek slowdown earlier than exercise picked up once more.
Cash buying and selling fell to $55.94 million on Wednesday, Oct. 7, then recovered to $85.77 million on Saturday and $93.34 million on Sunday.
Despite the weekend rebound, its whole weekly money quantity fell 3.89% in contrast with the earlier week.
Kalshi sports activities and crypto markets stay main contributors
The Sports-labeled subset in our present classification snapshot generated $3.76 billion in contract quantity, representing 19.79% of Kalshi’s weekly whole. It just isn’t a licensed all-sports whole.
The BTC-labeled subset generated $2.05 billion in contract quantity, accounting for 10.78% of Kalshi’s weekly whole. Other crypto-related labels are listed individually under.
Other mapped labels in the identical classification snapshot included:
The labels above are chosen, mutually unique buckets in our present aggregation map, not an exhaustive venue-published taxonomy. Another $12.42 billion, or 65.29% of Kalshi’s weekly contract quantity, remained unclassified. Current-map reconciliation doesn’t certify historic class protection or class progress.
Mapped politics and MVP exercise
Smaller mapped subsets additionally contributed to the week’s exercise. Whole-category week-over-week progress stays unverified as a result of historic classification protection has not been independently established.
The Politics-labeled subset generated $58.35 million in weekly contract quantity.
The MVP-labeled subset generated $5.85 million in weekly contract quantity.
Kalshi rises throughout six reviewed weeks
Across the six accomplished weeks reviewed, Kalshi weekly contract quantity elevated from $11.86 billion for the week ending Sept. 6 to $19.03 billion for the week ending Oct. 11, a acquire of 60.35%.
Our supporting execution-price greenback measure rose from $3.15 billion to $4.42 billion throughout the identical collection. Aggregated commerce executions elevated from 67.43 million to 97.91 million.
Kalshi’s headline contract quantity elevated in all 5 week-over-week comparisons on this six-week collection. Its supporting execution-price greenback measure slipped from $4.44 billion to $4.42 billion within the newest week, a 0.50% decline. Growth in face-value contract quantity doesn’t essentially suggest progress in execution-price greenback quantity.
Polymarket US almost triples throughout the six-week collection
Polymarket US had the biggest relative improve in its personal headline-volume measure among the many three tracked platforms throughout the six-week collection.
Its reported weekly Trade Volume rose from 974.55 million for the week ending Sept. 6 to 2.82 billion for the week ending Oct. 11, a rise of 189.64%.
The platform’s reported weekly Trade Volume peaked at 2.83 billion inside this collection for the week ending Sept. 27, dipped to 2.71 billion the next week, after which recovered within the newest interval.
The timing coincides with the beginning of the soccer season and the expansion of multi-outcome sports activities contracts. The knowledge exhibits these tendencies occurred alongside the rise, though the weekly totals alone can not set up how a lot every issue contributed.
Polymarket stays comparatively secure
Polymarket has adopted a unique sample. Its weekly cash trading volume remained between $487 million and $548 million all through the six-week interval.
September’s whole reached roughly $2.17 billion in money buying and selling. October’s whole stood at $839.67 million by means of Oct. 11.
How to learn the quantity numbers
The three platforms report quantity otherwise, which is necessary when evaluating their measurement and progress.
Kalshi: The $19.03 billion headline counts contracts at $1 face worth. The $4.42 billion execution-price greenback measure and execution counts are supporting aggregation figures, not independently venue-certified cash-turnover or transaction-count collection.
Polymarket US: The 2.82 billion determine comes from the venue-native Trade Volume area in official Daily Market Reports. It is stored separate from execution-price money {dollars}; the supply area alone doesn’t set up a cash-dollar denomination.
Polymarket: The $498.81 million determine measures the greenback worth of accomplished trades, utilizing taker-side executions.
Binary contracts typically commerce for lower than $1, so their face worth will be considerably increased than the quantity paid to purchase them. For instance, shopping for a contract for $0.40 creates $1 in face-value quantity however includes solely $0.40 in money at execution.
The platforms additionally use totally different reporting calendars: Kalshi makes use of UTC weeks, Polymarket US makes use of official enterprise dates, and Polymarket makes use of US Eastern time. So the totals are helpful for monitoring every platform’s efficiency, however they aren’t immediately interchangeable.
What to observe subsequent week
NFL and faculty soccer might gas one other energetic week throughout Oct. 12-18. Sunday’s NFL slate contains the Buffalo Bills on the Las Vegas Raiders and the Dallas Cowboys on the Green Bay Packers. Those video games might draw exercise in sports activities and multi-outcome markets, however this stays a forward-looking chance moderately than a quantified forecast.
Economic knowledge releases, together with inflation and retail gross sales studies, might additionally drive exercise in markets tied to Federal Reserve coverage and the US financial system. Meanwhile, midterm election predictions, Trump’s public statements, and ongoing geopolitical developments might create extra buying and selling alternatives.
After Kalshi reached the very best weekly contract-volume whole within the six-week collection reviewed, the important thing query is whether or not one other busy weekend can push exercise increased.
