What Are Prediction Markets?
Prediction markets are online platforms where users buy and sell contracts based on the outcome of real-world events. Unlike traditional sports betting, where people wager against a bookmaker, prediction markets let users trade on the likelihood of events, such as who will win a game or an election. These markets use the collective wisdom of participants to set prices, which reflect the probability of an outcome. As more people buy contracts for a certain result, the price rises, signaling a higher chance of that event happening. Prediction markets have grown in popularity because they offer a unique way to gauge public opinion and expectations on everything from sports to politics.
MLB’s Groundbreaking Partnership With Polymarket
Major League Baseball (MLB) made headlines yesterday by announcing a multiyear partnership with Polymarket, a leading prediction market platform. This deal marks a major shift in MLB’s approach to prediction markets. In the past, MLB warned players and staff against engaging with these platforms, citing concerns about integrity and insider information. Now, the league is embracing prediction markets as a way to engage fans and create new revenue streams.
The partnership gives Polymarket exclusive rights to use official MLB team logos and marks. It also allows Polymarket to access official league data from Sportradar, MLB’s exclusive global distributor of data for prediction markets. While financial details were not disclosed, industry estimates suggest the deal could be worth between $150 million and $300 million over three years. This move positions MLB at the forefront of a growing trend among sports leagues to explore new ways to monetize fan engagement.
How Prediction Markets Differ From Traditional Sports Betting
Prediction markets are not the same as traditional sports betting. In a typical sportsbook, bettors place wagers against the house, which sets the odds and pays out winners. In prediction markets, users trade contracts with each other, and the price of each contract reflects the market’s collective belief about the likelihood of an event. For example, if a contract for “Team A wins the championship” is trading at $0.70, the market believes there is a 70% chance of that outcome.
This system allows for more dynamic pricing and can respond quickly to new information. It also means that users can buy or sell contracts at any time before the event is settled, allowing them to lock in profits or cut losses. Prediction markets are often seen as more transparent and efficient than traditional betting, as they aggregate the knowledge and opinions of many participants.
Integrity and Oversight: MLB’s New Approach
One of the biggest concerns with prediction markets is the risk of insider trading and manipulation. MLB has addressed these concerns by working closely with Polymarket to restrict certain types of markets. For example, users will not be able to trade contracts on individual pitches, umpire decisions, or managerial choices—areas that could be vulnerable to manipulation by insiders.
To further protect the integrity of the game, MLB has signed a memorandum of understanding with the Commodity Futures Trading Commission (CFTC). This agreement establishes a framework for sharing information and monitoring potential threats to game integrity. Designated representatives from both organizations will meet regularly to identify and address issues that could impact the fairness of prediction markets and the sport itself.
MLB Commissioner Rob Manfred emphasized that partnering with prediction platforms allows the league to proactively manage risks. This approach mirrors how sports leagues have evolved their relationships with regulated sports betting over the past decade. By working with regulators and market operators, MLB aims to stay ahead of potential problems rather than reacting after the fact.
Why Are Prediction Markets Growing So Quickly?
The popularity of prediction markets has surged in recent years. Platforms like Polymarket and Kalshi now handle billions of dollars in trades each week. These markets have expanded beyond sports to include politics, entertainment, and even global events. For example, users can trade contracts on the outcome of elections, the passage of legislation, or the occurrence of major world events.
This growth is driven by several factors. First, prediction markets offer a new way for fans to engage with their favorite sports and teams. Instead of just watching a game, fans can participate in the action by trading contracts based on their predictions. Second, these markets provide valuable data on public opinion and expectations, which can be useful for teams, leagues, and broadcasters. Finally, the rise of blockchain technology has made it easier to create secure, transparent, and decentralized prediction markets.
Regulatory Concerns and Calls for Oversight
As prediction markets grow, lawmakers and regulators are paying closer attention. In the United States, members of Congress have raised concerns about insider betting and unethical profits from sensitive events. For example, some bettors reportedly profited from knowledge of military actions before they became public, raising alarms about the potential for abuse.
Representative Greg Casar and Senator Chris Murphy are working on legislation called the BETS OFF Act. This bill aims to ban wagering on government actions, terrorism, war, assassination, and other events where individuals might have insider knowledge or control over outcomes. The goal is to prevent people from profiting at the expense of public safety or national security.
Platforms like Kalshi and Polymarket say they already prohibit wagering on death or war and enforce strict bans on insider trading. However, some experts, such as Benjamin Schiffrin of the nonprofit Better Markets, argue that self-regulation is not enough. They call for stronger federal oversight to ensure fairness and safety for all participants.
MLB’s Integrity Framework: A Model for Other Leagues?
MLB’s partnership with Polymarket and its agreement with the CFTC could serve as a model for other sports leagues. By establishing clear rules and working closely with regulators, MLB is setting a standard for how to manage the risks and opportunities of prediction markets. The league’s integrity framework includes:
– Restricting markets that pose integrity risks, such as those related to individual pitches or managerial decisions.
– Integrating integrity controls into Polymarket’s rulebook to ensure consistent standards.
– Sharing confidential information with regulators to monitor and address potential threats.
– Maintaining relationships with other prediction market exchanges and requiring them to adopt similar protections.
This proactive approach is designed to protect the integrity of the game while allowing fans to engage in new and exciting ways.
The Future of Prediction Markets in Sports and Beyond
The entry of MLB into the prediction market space signals a new era for both sports and financial markets. As more leagues and organizations explore these platforms, prediction markets could become a mainstream part of the fan experience. They offer new ways to engage with sports, access real-time data, and even influence the conversation around major events.
However, the growth of prediction markets also brings new challenges. Regulators must balance the benefits of innovation with the need to protect consumers and ensure fair play. Lawmakers will need to address questions about insider trading, market manipulation, and the ethical limits of what can be traded.
For now, MLB’s partnership with Polymarket stands as the most widely reported story in the world of prediction markets. It highlights the rapid changes taking place in the sports industry and the growing importance of technology and data in shaping the future of fan engagement.
Conclusion: A Turning Point for Prediction Markets
The partnership between MLB and Polymarket marks a turning point for prediction markets in the United States. By embracing these platforms, MLB is signaling that prediction markets are here to stay—and that they can be managed responsibly with the right oversight and safeguards. As other leagues and regulators watch closely, the lessons learned from this partnership will shape the future of prediction markets in sports, politics, and beyond.
The story of prediction markets is still being written, but one thing is clear: the line between sports, finance, and technology is blurring. Fans, leagues, and regulators must work together to ensure that prediction markets remain fair, transparent, and fun for everyone involved.

