Polymarket shelves nuclear detonation markets after outcry

Prediction market platform Polymarket has removed contracts that allowed users to bet on the detonation of nuclear weapons. This action follows increased scrutiny amid the current conflict with Iran and concerns about potential insider trading on war-related events.

Background on Nuclear Weapon Markets

These nuclear weapon-themed markets have existed on Polymarket for years, typically resolving to "No." However, recent events have brought renewed attention to these contracts.

The controversy intensified due to a trader reportedly profiting over $400,000 by betting on the capture of Venezuelan leader Nicolás Maduro shortly before a U.S. operation. This raised questions about whether insiders could exploit prediction markets to trade on military actions, such as the conflict with Iran.

Historical Trading and Volume

Historical data indicates that these contracts have occasionally reflected significant perceived risk. In 2023, a Polymarket contract suggested approximately a 19% chance of a nuclear weapon detonating by the end of the year. A subsequent market set to expire in June 2025 traded around a 12% probability.

The nuclear detonation contracts also saw substantial trading volume. The 2025 contract alone generated over $1.7 million in volume, while the 2023 version attracted nearly $700,000 in wagers.

Regulatory Scrutiny

The situation unfolds as U.S. regulators consider how to oversee prediction markets. In 2024, the Commodity Futures Trading Commission (CFTC) proposed rules that would prohibit regulated exchanges from listing event contracts related to war, terrorism, assassination, or other activities deemed contrary to public interest.

CFTC Chairman Mike Selig has indicated that the Commission plans to provide clearer guidance on prediction markets in the near future.