6 Shocking Facts About Insider Betting on Polymarket
Prediction markets like Polymarket have become popular for wagering on political events, but a recent analysis by the Anti-Corruption Data Collective reveals a disturbing pattern: insider trading is rampant. Their study shows that large bets on long-shot outcomes—especially those related to military and defense—win far more often than they should, suggesting that some traders have non-public information. This listicle dives into the key findings and what they mean for the integrity of these platforms.
1. What Polymarket Is and How It Works
Polymarket is a decentralized prediction market where users bet on the outcomes of real-world events, from election results to military actions. Traders buy shares in a “yes” or “no” outcome, with prices reflecting market probabilities. Unlike traditional betting, Polymarket operates on the blockchain, offering transparency and low barriers to entry. However, this openness also makes it vulnerable to abuse—especially when insiders leverage privileged knowledge to place winning bets. The platform has grown rapidly, but with growth comes increased scrutiny over its regulatory status and fairness.
2. The Anti-Corruption Study That Exposed the Problem
The Anti-Corruption Data Collective, a nonprofit research group, analyzed millions of bets on Polymarket and identified a clear anomaly: long-shot bets with large stakes were winning at unexpectedly high rates. They defined “long-shot” as wagers of $2,500 or more at odds of 35% or less. The study focused on markets covering military and defense actions—areas where non-public information can be extremely valuable. The findings were stark: these high-stakes long-shots won 52% of the time, far exceeding normal probabilities.
3. Win Rates: Long-Shots vs. Everything Else
To understand the scope of the discrepancy, compare those 52% win rates to other market categories. In politics-focused markets, long-shot bets succeeded only 25% of the time. Across all Polymarket markets, the win rate dropped to just 14%. This means military/defense long-shots were more than 3.7 times more likely to win than the average. Such a massive gap points strongly to asymmetric information—likely from inside sources who know about troop movements, weapons tests, or geopolitical decisions before they become public.
4. Why Insider Betting on Military Actions Is Especially Dangerous
Insider trading in sports is bad enough—it undermines fair competition and trust. But insider betting on military and defense actions carries far graver consequences. It can reveal classified intel, incentivize leaks, or even influence decision-making for profit. Imagine a government contractor placing a massive bet before an announcement of a new drone strike. The financial motive could warp national security policy. The study shows this isn’t hypothetical—it’s happening now on Polymarket, yet it remains legally in a gray area.
5. The Legal Loophole That Allows This to Continue
Why isn’t this stopped? Polymarket operates outside traditional US financial and gambling regulations. The platform is built on smart contracts and crypto, making it pseudonymous and difficult to police. While the Commodity Futures Trading Commission (CFTC) has taken action against some prediction markets, Polymarket has so far evaded major enforcement. The “insider trading” label is hard to apply when the underlying assets aren’t securities or commodities in the traditional sense. This legal fog creates an environment where insiders can profit with little fear of prosecution.
6. What Needs to Change
To restore trust, Polymarket and similar platforms must implement stronger KYC (Know Your Customer) policies, monitor for suspicious betting patterns, and cooperate with regulators. The Anti-Corruption Data Collective’s findings should be a wake-up call. Potential reforms include banning bets on sensitive military topics, imposing position limits, and sharing trading data with authorities. Until action is taken, the integrity of prediction markets remains at risk, and their promise as tools for forecasting is undermined by those who cheat the system.
Conclusion: The evidence from Polymarket shows that insider betting is not a fringe issue—it’s a systemic flaw. The 52% win rate on large, long-shot military bets is a red flag that cannot be ignored. Without regulatory oversight and platform reforms, prediction markets could become playgrounds for powerful insiders rather than fair forums for collective wisdom. It’s time for policymakers and platform operators to act before trust is completely eroded.