Combined monthly trading volume across Polymarket and Kalshi rose from under $5 billion in September 2025 to roughly $24 billion by April 2026, according to a Pew Research Center analysis of The Block data—nearly double the $14 billion monthly average across legal US sportsbooks in 2025. Sports, politics, and cryptocurrency are the three highest-volume categories on both platforms, though the mix differs: sports accounts for 80% of volume on Kalshi and 39% on Polymarket, while crypto and politics combine for 52% of Polymarket's turnover.
Prediction markets let participants trade on the future outcome of real-world events—from the NBA Finals tipping off on Wednesday June 3 to SpaceX's potential June 12 Nasdaq listing to the price of oil by the end of the month. The timing in June 2026 is unusually dense, with several of the year's biggest sports events stacked into a two-week window during the first two weeks of the month.
New to prediction markets? This guide to key prediction market concepts covers how they work.
Disclaimer: This guide is for educational purposes only. It is not financial advice, not a solicitation, and not for UK audiences. Prediction markets are risky and not suitable for all users.
Politics and elections
Political markets remain among the most active categories in prediction trading. Participants trade event contracts on high-profile elections, leadership contests, governance decisions, and more. Polymarket lists over 1,700 active political markets with more than $3.3 billion in total trading volume as of June 1, 2026.
Market | Key info |
Balance of power: 2026 midterms | The 2026 midterms market has drawn over $7.3 million in volume as of June 1, 2026, with Democrats Sweep at 47% implied probability. Recent special election results showed consistent Democratic gains, and The Economist's model estimates Democrats as heavy favorites to flip the House. |
Which party will win the Senate in 2026? | Senate control markets are among the most actively traded on the Congress page, with Republicans at roughly 55% implied probability as of June 1, 2026. |
Democratic presidential nominee 2028 | Gavin Newsom leads at 25% implied probability, followed by J.D. Vance and other contenders, with millions in early volume for 2028 election forecasts as of June 1, 2026. |
US-Iran nuclear deal by June 30? | Geopolitical flashpoints have bled into the politics category. The US-Iran peace deal market is among the most actively traded political markets on the platform alongside the midterms. |
Who will Trump nominate as Fed Chair? | Governance markets around key appointments continue to attract substantial trading volume as current Chair terms and economic conditions shift. |
Congress passes Iran war powers resolution by June 30? | New congressional markets have emerged around foreign policy votes, reflecting the broadening scope of political prediction trading in 2026. |
Geopolitics
The US-Iran conflict and Strait of Hormuz crisis—which escalated through early 2026—turned geopolitics into one of prediction markets' fastest-growing categories. Polymarket's Geopolitics category now hosts 590 markets, with Iran markets alone aggregating over $482 million in total trading volume across 20 active contracts as of June 1, 2026.
Market | Key info |
US-Iran permanent peace deal by ___? | The most actively traded geopolitics market, with the December 31 deadline attracting the highest implied probability. A fragile April ceasefire and subsequent diplomatic efforts—mediated in part by Pakistan—have kept deal probabilities in flux. |
Strait of Hormuz traffic returns to normal by end of May? | This market drew $19 million in volume reflecting global uncertainty about the waterway that normally handles roughly 20% of the world's seaborne oil trade. The May deadline has passed—check resolution status. |
Iran closes its airspace by ___? | $26 million in volume as of late May 2026, with June 30 at 38% implied probability. |
Will the Iranian regime fall by June 30? | $26 million in volume as the regime's orderly leadership succession in February 2026 and continued IRGC control have kept implied probability low. |
Iran ceasefire continues through ___? | $4 million in volume as the April 2026 ceasefire between the US, Israel, and Iran remains fragile, and this market tracks whether it holds through successive monthly deadlines. |
Will the US invade Iran before 2027? | One of the longest-dated geopolitical contracts, attracting both speculative and hedging interest. |
The broader geopolitical category also covers Ukraine, Middle East, and other conflict zones—but the Iran cluster has dominated volume since early 2026.
Sports: championships, MVPs, and game outcomes
Sports is the dominant prediction market category by volume in 2026—accounting for 80% of Kalshi's turnover and 39% of Polymarket's since July 2024, according to the Pew Research Center's May 2026 analysis. On Kalshi, 87% of March 2026 trading volume—$9.9 billion out of $11.39 billion—came from sports event contracts. An SSRS Sports Poll published May 28, 2026 found that 5% of American adults now use prediction markets for sports trades, rising to 11% among men aged 18–34. The FIFA World Cup—kicking off June 11 across the US, Canada, and Mexico—is set to become the single largest sports prediction market event in history.
Football (soccer)
The 2026 FIFA World Cup is the first 48-team tournament in history, expanding from 32 teams with 12 groups of four replacing the traditional eight. The World Cup winner market is the most liquid sports prediction market ever run on Polymarket—with over $3 billion in total trading volume as of June 26 2026. Polymarket hosts of over 400 active World Cup markets covering group winners, knockout matchups, top goalscorer, and player availability.
Market | Key info |
2026 FIFA World Cup winner | The World Cup winner market has generated over $1.43 billion in volume as of June 1, 2026. France and Spain are co-favorites at roughly 17% implied probability each, followed by England, Argentina (around 10%), and Brazil. The tournament opens June 11 across 16 venues in the US, Canada, and Mexico, with the final scheduled for July 19. |
World Cup group stage and player markets | Dozens of group-winner contracts span all 12 groups. Player markets—including top goalscorer (Mbappé and Kane deadlocked at 15%), most assists, and availability questions like—"Will Neymar play in the 2026 FIFA World Cup?"—add depth to the category. Squad selection markets track specific players before the June 7 roster deadline. |
English Premier League winner | The 2025–26 EPL winner market resolved in May 2026 with Arsenal winning the title, generating $322.6 million in cumulative trading volume. |
UEFA Champions League winner | The Champions League winner market continues into the knockout rounds, with PSG leading at 57% implied probability as of June 1, 2026. |
Tennis
The 2026 French Open (May 18–June 7) is driving a surge in tennis prediction market activity. Polymarket hosts 269 live tennis markets as of June 1, 2026, spanning ATP, WTA, and individual match outcomes. The French Open category alone has 102 active markets with over $50.7 million in total trading volume.
Market | Key info |
2026 men's French Open winner | The men's singles winner market has generated $38.6 million in volume as of June 1, 2026—the highest-volume tennis market on the platform. Alexander Zverev leads at 41% implied probability as the tournament enters its second week, followed by Joao Fonseca at 19%. |
2026 women's French Open winner | The women's singles winner market has drawn $4.5 million in volume as of June 1, 2026, with Aryna Sabalenka at 42% implied probability and Marta Kostyuk at 16%. |
Individual match markets | Roland Garros generates dozens of match-level markets daily across both the ATP and WTA draws, with odds updating in real time as draws, upsets, and injury news reshape the bracket. |
US pro sports
The 2026 NBA Finals are the headline US sports event this week, with championship and player award markets spanning every major league.
Market | Key info |
2026 NBA champion | The 2026 NBA Champion market leads US pro sports with over $414 million in total trading volume as of June 1, 2026. The San Antonio Spurs—led by Victor Wembanyama—face the New York Knicks in the Finals, with the Spurs favored at 64% implied probability. Game 1 tips off June 3 at 8:30 pm ET in San Antonio. The Spurs advanced by rallying past the defending champion Oklahoma City Thunder in a decisive Game 7 of the Western Conference Finals, while the Knicks reached their first Finals since 1999 behind Jalen Brunson and Karl-Anthony Towns. |
NBA MVP | Shai Gilgeous-Alexander ran away with the 2025–26 NBA MVP award—the market had him at 95% implied probability before the announcement. |
2026 NHL Stanley Cup champion | The Stanley Cup Champion market continues to draw volume as the NHL playoffs advance. The Colorado Avalanche entered as early favorites. |
2026 MLB World Series champion | The World Series Champion market is building volume as the 2026 season progresses, with the Los Angeles Dodgers among the favorites. |
Who will win the Super Bowl? | NFL futures markets generate sustained year-round volume. The Kansas City Chiefs and other perennial contenders anchor early trading for the 2026–27 season. |
Motorsport
Market | Key info |
Formula 1 | The F1 Drivers' Championship market has generated over $184 million in trading volume as of June 1, 2026. Mercedes teammates George Russell and rookie Kimi Antonelli continue to lead the standings under F1's new 2026 regulations. The Constructors' Championship market has Mercedes at the top with 219 points, ahead of Ferrari (147) and McLaren (106). |
College sports and major events
Market | Key info |
March Madness / NCAA basketball | The 2026 NCAA tournament drove record-setting prediction market volume, with the Final Four—Michigan, Arizona, UConn, and Illinois—generating massive trading interest. Michigan won the championship 69–63 over UConn on April 6, 2026. On Kalshi, 87% of March 2026 trading volume—$9.9 billion out of $11.39 billion—came from sports event contracts. |
Winter Olympics 2026 | The Milano Cortina 2026 games (February 6–22) generated prediction market activity across individual sport outcomes, medal counts, and marquee finals. Norway topped the final medal table with a record 41 medals, the US finished second with 33, and the US men's hockey team defeated Canada 2–1 in overtime for their first gold since 1980. |
Crypto, economic, and financial markets
Prediction markets covering digital assets, equities, macroeconomic indicators, monetary policy, and commodities attract a globally diverse participant base. Polymarket's Economy category hosts 145 markets as of June 1, 2026, while the Crypto category hosts 314 active markets.
Market | Key info |
What price will Bitcoin hit this month? | Trading targets : BTC price moves across monthly brackets—$80,000, $100,000, $120,000, and beyond—with prices reacting to macro catalysts and sentiment. Key June catalysts include the potential US-Iran deal (which could push oil prices lower and ease inflation expectations) and the SpaceX IPO on June 12, which could shift risk appetite across asset classes. |
What price will Ethereum hit this month? | ETH: price bracket contracts track short and long-term periods, with volume influenced by network upgrades and broader crypto market conditions as of June 1, 2026. |
MicroStrategy sells any Bitcoin by ___? | The most actively traded crypto market as of June 1, 2026, with December 31, 2026 at 100% implied probability. MicroStrategy's corporate BTC treasury strategy has turned the company into a prediction market proxy for institutional Bitcoin conviction. |
Will the Fed change interest rates? | Polymarket hosts 20 active Fed markets with over $103.7 million in total trading volume as of June 1, 2026. Rate decision markets have taken on new complexity amid the oil price shock, with traders pricing both potential emergency cuts (recession scenario) and potential hikes (stagflation scenario). April 2026 consumer price data showed headline CPI at 3.8% and PPI at 6%, pushing bond yields higher before retreating as oil prices eased. |
Largest company by market cap at end of June | NVIDIA leads at 93% implied probability to be the world's largest company by market cap on June 30, 2026. Apple and Alphabet trail. |
S&P 500 daily open: up or down? | Short-duration index markets remain a staple of daily prediction market trading, reacting to overnight developments in oil prices, geopolitics, and earnings. |
Oil, energy, and commodities
The Strait of Hormuz crisis—beginning in late February 2026—turned oil and commodities into one of Polymarket's highest-volume subcategories. Polymarket hosts 115 active crude oil futures markets with over $94.7 million in total trading volume, alongside $66.6 million across broader commodity markets as of June 1, 2026.
Market | Key info |
Will crude oil hit ___ by end of June 2026? | The June crude oil bracket market has drawn $21.2 million in volume as of June 1, 2026, with the $110 strike already at 100% implied probability. Crude prices remain elevated following the Hormuz disruption, though a potential US-Iran deal could push prices lower through June. |
Strait of Hormuz traffic returns to normal | One of Polymarket's most-watched commodity-adjacent markets. The end-of-May deadline has passed—check resolution status. The Hormuz waterway normally handles about 20% of the world's seaborne oil trade. |
Will gold hit $6K by June? | Gold price bracket markets gained volume as a haven trade amid the energy supply disruption, with gold (XAUUSD) surpassing $4,800 per ounce earlier in 2026. |
US crude oil reserves | Strategic Petroleum Reserve drawdown markets track the impact of emergency stock releases by IEA member countries. |
Tech, science, and IPOs
Technology, science, and IPO event markets are among the fastest-growing categories in 2026. Polymarket's Technology category hosts 598 markets as of June 1, 2026, fueled by AI competition, the SpaceX IPO, and rapid news cycles.
Market | Key info |
SpaceX IPO | SpaceX filed a public S-1 with the SEC on May 20, 2026, following a confidential submission in April. The IPO date market shows 75% implied probability for a June 12 listing on Nasdaq under ticker SPCX, with a roadshow expected June 4–8 and pricing as early as June 11. The S-1 discloses 2025 revenue of $18.7 billion, driven largely by Starlink subscriber growth. The IPO valuation market has trader sentiment anchored around $1.75–2.00 trillion, potentially making it the largest IPO in history—raising up to $75 billion. |
Largest IPO by market cap in 2026 | SpaceX leads at 77% implied probability as of June 1, 2026, followed by Anthropic at 20%. OpenAI has dropped lower in the ranking as its IPO timeline extends into Q4. |
Which company will have the best AI model this month? | Monthly AI evaluation markets see Anthropic, Google, and OpenAI rotate as frontrunners based on adoption metrics, benchmarks, and product launches. Multiple millions in volume across monthly contracts. |
Will there be a breakthrough in fusion energy in 2026? | Long-term science forecasting attracts both enthusiasts and professionals. |
Major product launches and tech regulation | Product launch forecasting and tech regulation outcomes attract trading volume across the Technology category. |
Pop culture, media, and entertainment
Culture prediction markets offer participants a way to trade on box office performance, video game launches, music events, viral moments, and broadcast outcomes. Polymarket's Pop Culture category hosts 339 markets as of June 1, 2026.
Market | Key info |
Eurovision 2026 winner | The biggest resolved culture market of 2026 so far. Bulgaria's Dara won Eurovision 2026 with "Bangaranga," scoring 516 points in the Vienna grand final on May 16—topping both the jury and televote. Finland had been the pre-final favorite. Total Eurovision trading volume reached $195.8 million across 102 active markets, making it one of the highest-volume culture events in prediction market history. |
Highest grossing movie in 2026 | One of the most active ongoing culture markets. Spider-Man: Brand New Day, The Super Mario Galaxy Movie, and Avengers: Doomsday are among the contenders. Individual opening-weekend bracket contracts draw significant volume as each film premieres. |
GTA VI release and pricing | "GTA VI released before June 2026?" drew $13.2 million in volume despite trading at just 1% Yes—reflecting the game's enormous cultural footprint. Related markets cover whether the launch gets postponed again and whether the retail price will exceed $100. |
Elon Musk weekly tweet count | A recurring weekly market that tracks the number of posts from Musk's account. Tweet-count contracts are consistently among the most-traded culture markets on the platform, with the May 26–June 2 contract at 75% implied probability for 140–159 tweets. |
Nobel Peace Prize winner 2026 | The Nobel Peace Prize market has emerged as a new culture subcategory, with Volodymyr Zelenskyy at 11% implied probability as of June 1, 2026. |
"Mention markets" during major broadcasts | Contracts tied to specific words or phrases spoken during live events—such as a presidential address or awards ceremony—surge in popularity around tentpole moments. |
Miscellaneous and niche markets
Some of the most creative prediction markets fall outside traditional categories—covering everything from weather events to long-shot scenarios.
Market | Key info |
Will Jesus Christ return before 2027? | Participants trade on humanity's most contested long-shot topics. |
Will aliens land on Earth before 2027? | Extraterrestrial forecasting persists as a perennial novelty market. |
Weather and climate markets | Temperature forecasting contracts—such as "Will global temperature increase by more than 1.29°C in April 2026?"—represent an emerging niche vertical on Polymarket. |
What comes next for prediction market categories in 2026
The biggest prediction market catalysts of June 2026 are stacked into two weeks: the FIFA World Cup opens June 11, SpaceX targets a June 12 Nasdaq listing, the NBA Finals between the Spurs and Knicks tip off June 3, and US-Iran diplomatic markets are approaching near-term resolution deadlines. Any one of these events could reshape the odds across multiple categories.
The longer-term trajectory may matter more than any single event. Sports dominates volume today, but according to an a16z crypto analysis of the Pew data, every non-sports category is growing faster in user acquisition—with entertainment, crypto, politics, and culture showing stronger volume-retention cohorts than sports. Some industry estimates project prediction market volume could reach $1 trillion or more by 2030, a figure that depends on sustained category diversification beyond sports.
For a deeper look at the structural trends behind these numbers—from CFTC approval to AI-powered trading—see prediction market trends in 2026. For a breakdown of how pricing and order books work, see how prediction market pricing works. To learn how spreads, liquidity, and costs shape trading decisions, that guide covers the mechanics.
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