Industry Data
Railbird Volume by Topic
What Railbird trades: its volume, notional volume, transactions and fees split by topic, how that mix compares with every venue, and its sports by sport and by league. From Railbird's own trade records; each market series carries one topic, so a trade is counted once.
Weekly Railbird Prediction Market Volume by Topic
Weekly Railbird Prediction Market Notional Volume by Topic
Weekly Railbird Prediction Market Transactions by Topic
Weekly Railbird Prediction Market Fees by Topic
Learn more about Railbird's volume by topic
Volume is the price multiplied by the number of contracts for each trade, counting only one side. Railbird's trades, split by the topic of each market. Every series of markets on a venue carries exactly one topic, so no trade is counted twice. Combos (parlays) are their own series. Untagged is trading in markets not tagged with a topic yet: new market series before the next tagging run, and trades a venue files without a market.
Weekly Railbird Sports Prediction Market Volume by Sport
Weekly Railbird Sports Prediction Market Notional Volume by Sport
Weekly Railbird Sports Prediction Market Transactions by Sport
Weekly Railbird Sports Prediction Market Fees by Sport
Learn more about Railbird's sports volume by sport
Volume is the price multiplied by the number of contracts for each trade, counting only one side. This chart covers sports markets on Railbird, split by sport. Every series of markets on a venue carries exactly one topic, so no trade is counted twice. Combos (parlays) are not included; they have their own tab.
Weekly Railbird Sports Prediction Market Volume by League
Weekly Railbird Sports Prediction Market Notional Volume by League
Weekly Railbird Sports Prediction Market Transactions by League
Weekly Railbird Sports Prediction Market Fees by League
Learn more about Railbird's sports volume by league
Volume is the price multiplied by the number of contracts for each trade, counting only one side. This chart covers sports markets on Railbird, split by league. Every series of markets on a venue carries exactly one topic, so no trade is counted twice. Combos (parlays) are not included; they have their own tab.
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.