The Rebound Came With New Products.
August's dip lasted one month. Prediction markets traded $77.7 billion in September, up 53% on August, and weekly volume passed $20 billion for the first time. Kalshi took 78% of the month and is reportedly in advanced talks to raise near $40 billion, while Polymarket US more than doubled. The bigger story is what the venues are now selling. Polymarket launched perpetual futures, Kalshi extended its own to gold and silver and asked the CFTC to allow margin, and Cboe and Robinhood plan to open a second regulatory lane in October.
September volume reached a new high as the NFL season returned
Last edition called August a cooling month rather than a reversal, and September confirmed it. NFL kickoff and a heavy crypto calendar carried volume back through every week. Kalshi reset its weekly record twice, peaking at $15.66 billion in the week of 21 to 27 September, and had its first $3 billion day on 20 September.
The month added up to $77.7 billion across seven venues, according to DeFi Rate, up 53% on August like for like, and weekly volume passed $20 billion for the first time in late September. DeFi Rate counts every venue at $1 face value per contract, so its total is not comparable with the $45.33 billion August figure from The Block in last edition.
Kalshi took 78% of the month and, measured against Polymarket's international exchange, 96% of non-sports volume in the week ending 13 September. Distribution explains most of it, with Robinhood, Coinbase, Webull and Moomoo all routing retail flow into Kalshi's short-dated crypto and index contracts. The fastest growth came from elsewhere: Polymarket US more than doubled to $8.8 billion, while Polymarket's international exchange slipped 6% to $4.6 billion. These are notional figures, not revenue or deposits, and low-priced combos inflate them: a $20 order on a 5-cent parlay buys 400 contracts and counts as $400 of volume. Treat the direction as solid and the totals as an upper bound on money at risk.
"On every tracker, in every week of September, most of the category's volume went through one CFTC-regulated venue."
Sports now drives most category volume
A Pew Research Center analysis published on 23 September put numbers on what the summer suggested. Combined Kalshi and Polymarket volume roughly doubled from $26 billion in May to $53 billion in July, and sports drove most of it. On both venues, sports outtraded the next-largest category, crypto, by five to nine times. Politics, which built the category's profile in 2024, is now well behind both.
Contract design is moving too. More than 62% of Kalshi's volume in the week of 14 to 20 September came from combo contracts, which bundle several outcomes into a single position.
For an operator, those two numbers set the roadmap. A growth plan built around election attention is chasing a shrinking share of activity, and a product set built only on single-outcome contracts misses where most of the volume now sits.
Major venues moved past the binary contract
September's most consequential news was not a volume number. Within four weeks, Polymarket launched leveraged perpetuals, Kalshi broadened its own and asked to let institutions trade on margin, and a securities exchange announced a second regulatory route for prediction-style products. The category is turning into a broader derivatives business.
Polymarket
Perpetual futures · up to 20xLaunched 3 September with 67 markets across crypto, stocks, indices and commodities, up to 20x on crypto and 10x on single stocks. Offshore only: US traders are blocked.
Kalshi
CFTC-approved 24/7 perpsAdded round-the-clock perpetual futures on gold and silver on 10 September, and is reportedly preparing a filing for a WTI crude perpetual, which would be the first on a regulated US platform.
Kalshi
~60 stock and ETF perps soughtIs seeking CFTC and SEC approval for perpetual futures on about 60 stocks and ETFs, including Tesla, Apple and Nvidia. A regulated US alternative to offshore perpetual swaps if it clears.
Kalshi Klear
Margin petition to the CFTCAsked to let qualified, self-clearing participants trade event contracts on margin rather than full collateral, excluding sports, culture and mention contracts. Filed 22 September. Full collateral has been a main reason institutions trade smaller.
Cboe & Robinhood
SEC-regulated KPI options · planned OctoberBinary options on operating metrics at 23 US-listed companies, cleared through Cboe Clear U.S., with Robinhood as first retail broker and fees waived through year-end, subject to regulatory approval. A securities-market route alongside the CFTC one.
ITS Kazakhstan
Line extension · fintech sandboxA trading platform under the Astana International Financial Centre, with more than 1.2 million investors with access, unveiled event contracts on 8 September through the regulator's fintech sandbox.
The common thread is product breadth. A competitive prediction markets offering now sits closer to a multi-asset derivatives venue than a single contract type, which raises what an operator's platform needs to support, from leverage and margin to round-the-clock risk management.
Capital priced the leaders higher and started taking stakes in partners
The Kalshi round flagged last month is still reported, not closed. Sequoia Capital and Wellington Management are in advanced talks to lead it at about $40 billion, nearly double the $22 billion mark set in May, per The Information and Reuters, and Kalshi has said it is considering a 2027 IPO. Polymarket is reportedly closing a $1 billion round led by 1789 Capital at about $21 billion, per Bloomberg, the New York Times and the Wall Street Journal. Polymarket has not confirmed it.
The more interesting structure came from Robinhood. It is taking minority equity in Crypto.com and in OG.com, Crypto.com's spun-off prediction markets unit, priced off Citadel Securities' $20 billion valuation of Crypto.com, with OG.com valued at $5 billion. Robinhood began routing retail event contract flow to OG.com's CFTC-regulated exchange from 8 September. Its event contract revenue reached $156 million in the second quarter, more than ten times a year earlier.
Public markets have started to notice. JPMorgan initiated Genius Sports at Overweight on 25 September with an $8 price target, nearly 40% above the prior close, and said its prediction markets upside is not in current analyst estimates.
"Robinhood now owns a piece of two of the venues it routes event contracts to."
Venues began licensing their exchanges to branded front ends
The Tunica-Biloxi Tribe of Louisiana announced SaltTrade Derivatives on 18 September, a tribally owned consumer app built on Kalshi's regulated exchange. It gets a federally regulated market and nationwide liquidity without building exchange infrastructure. The arrangement shows the limits of single-venue white-labelling as clearly as its appeal.
- Matching
- Clearing
- Custody
- Surveillance
- Nationwide liquidity
- Brand
- Marketing
- Customer experience
- The customer relationship
The trade-off is concentration. A single-venue storefront can list only what that venue lists, at that venue's prices and fees, and its customers sit in a new app rather than an existing account. Robinhood took the other route this month. It keeps event contracts inside its own app, routes them across Kalshi, ForecastEx, Rothera and now OG.com, and holds equity in two of those venues, arguing that routing to several venues makes for a more resilient marketplace. For a broker or exchange with an existing customer base, that is the more durable model: the customer, the balance and the margin stay with the platform, and no single venue controls the product.
A comparison layer is forming on top of the venues. Genius Sports launched Prediction.com on 17 September, comparing equivalent event contracts across Kalshi, Polymarket and other venues alongside live sports data. Odds comparison sites shaped the sportsbook market the same way. If one aggregator becomes where users compare contracts, a listing there becomes part of customer acquisition, and spreads and fees across the category will face more pressure.
Polymarket × LeBron James
Athlete deal · 5 SeptemberThe first NBA player to sign with Polymarket, reportedly paid $15 million a year, alongside Derek Jeter and Eli Manning.
Riot Games
Sponsorship talksHas discussed esports sponsorships with both Kalshi and Polymarket ahead of the League of Legends World Championship. No deal announced.
Trueo
Onchain · Ethereum mainnetAnnounced a move from Base to Ethereum mainnet with Vitalik Buterin's public backing, at a tiny fraction of the regulated venues' scale.
Regulatory pressure moved from the courts to the contracts
September added pressure from states, the courts, the CFTC and Congress. Most of it targets specific contracts rather than the category itself.
For an operator, the friction is still narrow. It centers on US sports contracts, a few contract types and who holds authority, and in the same weeks the same regulators kept processing new product applications, including Kalshi's margin petition and stock perpetual filings.
Scrutiny is moving from whether these markets should exist to how specific contracts should work. That is what supervision of a maturing market looks like.
What this means if you run a trading platform
August asked whether volume would hold after the World Cup. September answered it: volume came back to records within a month, and NFL season and crypto activity did more to carry it than any single event.
The volume answer is less important than the product answer. In a single month, Polymarket launched leveraged perpetual futures, Kalshi broadened its own and asked to offer margin, and Cboe and Robinhood announced SEC-regulated KPI binary options. A competitive prediction markets offering now looks like a multi-asset derivatives venue, built around sports volume and multi-leg combos rather than single election contracts.
The way partners get paid is changing too. Robinhood took equity in a venue it routes to, Kalshi is pricing toward a possible IPO, and SaltTrade put a branded app on Kalshi's exchange without building one of its own. Venues are competing for distribution, and distribution partners are asking for a share of the upside.
For an operator weighing entry, September clarifies the choice. Liquidity is concentrating on a few regulated venues, their product sets are broadening every month, and comparison sites will make pricing more transparent. A branded storefront on one venue is a quick way in, but it leaves listings, pricing and most of the economics with that venue. Adding prediction markets inside your existing platform, connected to several liquidity sources, keeps the customer account, the fee and markup decisions and the choice of venue with you. That is how Shift's white label prediction markets are built: one integration that aggregates liquidity from Polymarket and leading venues, running on your own KYC, balances and fee structure.
Key takeaways
Add prediction markets to your platform.
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September monthly volume by venue, Kalshi's weekly records and the 53% like-for-like change from DeFi Rate's volume tracker, observed 7 October 2026, which counts every venue at $1 face value per contract. The August edition's $45.33 billion came from The Block's dashboard, which covers fewer venues and uses each venue's own reporting basis, so the two totals are not directly comparable. Non-sports share (week ending 13 September) and the first $20 billion week (late September) from Artemis via Cryptopolitan.
Category mix from Pew Research Center's analysis of The Block's data, published 23 September 2026. Combo contract share from DeFi Rate's report on the week of 14 to 20 September 2026. Combo volume inflation example from Cryptopolitan, late September 2026.
Polymarket perpetual futures from Decrypt and Unchained, 3 September 2026. Kalshi metals perpetuals from Gaming.net, 10 September; stock perpetuals from Bloomberg via Crypto Briefing, 11 September; WTI perpetual filing reported by Cointelegraph and Unchained, not confirmed as filed; margin petition from PYMNTS and CNBC, 22 September 2026. Cboe and Robinhood KPI options from Cboe's press release, subject to regulatory approval. ITS from SiGMA, 8 September 2026.
Kalshi's reported ~$40 billion round from The Information and Reuters, in advanced talks and not closed as of publication. Polymarket's reported $21 billion round from Bloomberg, the New York Times and the Wall Street Journal, 31 August 2026, not confirmed by Polymarket. Robinhood, Crypto.com and OG.com from Decrypt and The Block, 8 September 2026; Robinhood's $156 million is second-quarter event contract revenue. JPMorgan's Genius Sports initiation from Stocktwits and MarketBeat, 25 September 2026.
SaltTrade Derivatives from Business Wire and Kalshi, 18 September 2026. Prediction.com from Genius Sports, 17 September 2026. LeBron James partnership from The Block, 5 September 2026; reported fee from Front Office Sports. Riot Games talks from Bloomberg, 10 September 2026, reported. Trueo migration from Cointelegraph, 21 September 2026.
New York's suit against Polymarket from Reuters and the New York Attorney General, 24 September 2026. Missouri from SBC Americas, 18 September 2026. New Jersey's Supreme Court petition from The Block, 2 September 2026. CFTC staff advisory on mention contracts, 22 September 2026. CLARITY Act cloture vote from CDC Gaming, 15 September 2026.
All volume figures are notional and do not measure platform revenue or customer deposits.