The alleged $400,000 insider bet by a Green Beret on a Venezuela raid may be just the tip of the iceberg. A recent report by the Anti-Corruption Data Collective (ACDC) analyzed over 435,000 Polymarket contracts and $54.4 billion in trading volume, revealing suspiciously high win rates for low-probability bets on military and defense outcomes. Typically, such "longshot" bets succeed around 14% of the time, but in military-linked contracts, success rates have exceeded 50% in some cases. This discrepancy suggests that some traders may be exploiting information asymmetries, including insider trading or specialized knowledge.
The report's findings are consistent with previous research indicating that a small group of traders, roughly 3%, drive price discovery on Polymarket, while fewer than 1% of wallets capture about half of all gains. The ACDC report examines the June 2025 U.S.
strikes on Iran as a case study, where 19 longshot bets totaling $164,292 were placed in the hours leading up to the strike, resulting in profits of around $1.8 million for eight wallets. The pattern of well-timed bets on military outcomes raises concerns about the integrity of these markets. To address these issues, the report recommends identity verification for bettors, conditional payouts on suspicious wagers, restrictions on markets whose outcomes are decided by small groups, and limits on contract granularity.
Ultimately, the report calls for a broader debate on whether the public should be allowed to bet on these outcomes at all.