10 Shocking Truths About Insider Betting on Polymarket

Prediction markets like Polymarket have exploded in popularity, offering a glimpse into the future through the wisdom of crowds. But a dark underbelly has emerged: insider betting. An analysis by the Anti-Corruption Data Collective reveals that long-shot wagers on military actions win at an astonishing rate—far exceeding normal odds. This raises serious concerns about the integrity of such platforms. Here are 10 critical insights you need to know about this disturbing trend.

1. What Exactly Is Polymarket?

Polymarket is a decentralized prediction market platform built on blockchain technology, where users bet on the outcomes of real-world events. From political elections to military actions, traders use cryptocurrency to wager on binary yes/no outcomes. Unlike traditional betting sites, Polymarket operates with minimal oversight, relying on smart contracts and community-driven market making. This lack of regulation creates fertile ground for those with non-public information—a threat the platform has yet to address effectively.

2. The Insider Betting Investigation That Exposed the Problem

The Anti-Corruption Data Collective, a non-profit research and advocacy group, conducted a deep dive into Polymarket's betting patterns. Their analysis focused on wagers that seemed too good to be true—specifically, long-shot bets that consistently paid off. The findings were alarming: insiders appeared to be exploiting privileged knowledge, particularly in markets related to military and defense actions. The group's report highlighted a systemic issue that undermines the platform's credibility.

3. Defining the 'Long-Shot' Bets Under Scrutiny

To pinpoint suspicious activity, researchers set specific criteria. A bet was considered a long-shot if it involved a wager of $2,500 or more placed at odds of 35 percent or less (meaning the market gave it a low probability of occurring). These high-stakes, low-probability bets are exactly the kind that insiders with advance knowledge might favor—since they can invest large sums when they know an outcome is more likely than the market believes.

4. Staggering Win Rate on Military and Defense Markets

The most shocking statistic from the investigation: long-shot bets on military and defense actions had an average win rate of around 52 percent. To put that in perspective, that's more than double the win rate for similar bets across all politics-focused markets (25 percent) and nearly quadruple the overall platform average of 14 percent. Such a dramatic deviation from expected probabilities strongly indicates that insiders are influencing these markets.

5. Why Military Markets Are Especially Vulnerable

Military and defense decisions often involve classified information that is not available to the public. Intelligence agencies, defense contractors, and government officials may have access to details about troop movements, weapons tests, or strategic shifts. When this knowledge leaks—even indirectly—into betting markets, it distorts outcomes. Unlike sports or entertainment, where information asymmetry is limited, military secrets can have life-or-death consequences, making insider betting particularly dangerous.

6. Contrast with Insider Betting in Sports

Insider betting is a well-known problem in sports, where coaches, players, or referees might wager on game outcomes. But the implications for politics and military are far more severe. A sports scandal affects a game; a political insider bet can sway public perception or even influence policy decisions. As the report notes, “Insider betting warping politics—and military actions—is orders of magnitude worse.” The stakes are higher, and the potential for real-world harm is immense.

7. The Legal Gray Areas Polymarket Operates In

Polymarket is not regulated by traditional financial or gambling authorities. It operates in a legal gray zone, especially in the United States, where the Commodity Futures Trading Commission has issued no-action letters for certain prediction market contracts but not for others. This lack of oversight means that even if insider betting is suspected, enforcement is nearly impossible. The platform's decentralized nature makes it difficult to identify—and prosecute—bad actors.

8. The Scale of the Problem: Not Just Isolated Incidents

The Anti-Corruption Data Collective's analysis suggests that insider betting on Polymarket is not a few rogue individuals but a systemic issue. Long-shot bets on military topics showed consistently abnormal returns over time, indicating a pattern of exploitation. With millions of dollars flowing through the platform, the financial incentive for insider trading is enormous, and the current safeguards are insufficient to stop it.

9. Potential Consequences for Democracy and Global Stability

When prediction markets are corrupted by insiders, they no longer reflect collective wisdom but instead amplify misinformation. Policymakers and analysts sometimes use market probabilities to gauge public sentiment or anticipate events. If those probabilities are skewed by secret knowledge, it can lead to poor decision-making. Moreover, the perception that insiders profit from sensitive information erodes public trust in both the market and the institutions involved.

10. What Steps Can Be Taken to Curb Insider Betting?

Addressing this issue requires a multi-pronged approach. Polymarket could implement stricter know-your-customer (KYC) procedures, though that conflicts with its ethos of anonymity. Regulators could step in to define clear rules for prediction markets. Additionally, the platform could monitor betting patterns for anomalies—flagging accounts that consistently win on long-shots. Until meaningful reforms are adopted, insider betting on Polymarket will remain a threat to fair and transparent markets.

The disturbing trends uncovered by the Anti-Corruption Data Collective should serve as a wake-up call. Prediction markets hold great promise, but without robust safeguards, they risk becoming tools for the well-informed—at everyone else's expense. Awareness is the first step toward demanding accountability. As the platform evolves, so too must the measures to keep it honest.