Industry Data
Combos Volume
Combos are parlays and other contracts that combine several outcomes in one trade. They are left out of every topic tab and counted here: how much of each venue's trading they make up, by venue and by sport.
Weekly Combos Prediction Market Volume
Weekly Combos Prediction Market Notional Volume
Weekly Combos Prediction Market Transactions
Weekly Combos Prediction Market Fees
Learn more about combos volume
Volume is the price multiplied by the number of contracts for each trade, counting only one side. Combos are parlays and other contracts that combine several outcomes in one trade, by venue. They are counted here and left out of every topic tab.
Weekly Combos Prediction Market Volume by Topic
Weekly Combos Prediction Market Notional Volume by Topic
Weekly Combos Prediction Market Transactions by Topic
Weekly Combos Prediction Market Fees by Topic
Learn more about combos volume by topic
Volume is the price multiplied by the number of contracts for each trade, counting only one side. Combos split by topic. Most parlays combine legs from several sports and topics, and each venue reports them together, so they are counted as Mixed Parlays. Combos on a single topic, such as midterm election combos, carry that topic.
FAQs
Common questions about prediction market data and how it’s calculated.
Are prediction markets becoming more popular?
Yes. Trading volume has grown sharply through 2026, with monthly totals across major platforms reaching into the tens of billions of dollars. Kalshi and Polymarket regularly appear in national news coverage, and have struck data and distribution partnerships with major names like Robinhood, CNBC, CNN and Google Finance.
What are the top 10 prediction markets?
Kalshi and Polymarket lead by volume, followed by platforms like Novig, ProphetX, and Underdog. The answer really depends on the features most important to you, like range of markets, fees and trading experience. See our list of prediction market apps for a detailed breakdown of each platform’s strengths.
Which prediction market app is the most accurate?
There’s no single answer. Accuracy or calibration will vary by platform, market and time period. Generally, higher liquidity and trading activity mean more stable pricing on event contracts. You can also look at platforms’ price and trade history over time to inform your opinion. Try our Kalshi and Polymarket historical data guide as an example.
Who are the biggest players in prediction markets?
Kalshi and Polymarket are the two largest platforms by volume and user activity, together accounting for the large majority of industry-wide trading. The gap between the two shifts week to week depending on the sports calendar, news cycle and major events.
Contact us
Want to request data or get download access?
Whether you need numbers for your own work, want a chart added to this page or need the data behind it, send me a message on Telegram or X, or email the team at [email protected].
dash
Industry Data Lead
dash has 6 years of experience as a data scientist and has created the most cited Prediction Market dashboards.