Opinion: If a single trader can manipulate the outcome of a prediction market, that market should not be launched for trading.

CryptoWorld News: As prediction market platforms like Polymarket gain mainstream attention during U.S. election cycles and geopolitical events, their prices are increasingly cited as real-time signals. However, this premise fails when contracts create economic incentives for participants to alter the outcomes they measure. The core issue lies in product design, not volatility. When a result can be achieved by a single actor through a single action, the contract shifts from a prediction tool to an execution script. Using the example of betting on a Super Bowl halftime show intrusion, the article notes that traders personally carry out the act after betting “yes,” and such cases have already occurred. Political and event markets are especially vulnerable because they often rely on discrete points that can be influenced at low cost and have low liquidity. If participants begin to suspect that outcomes are being artificially manipulated, platforms will lose credibility. The article argues that sports markets, due to high visibility, multi-layer governance, and multi-party participation, are less susceptible to individual manipulation and should serve as structural references. Prediction market platforms should establish clear listing standards to exclude contracts that can be easily manipulated by a single participant or that constitute harm-bounty schemes; otherwise, external regulation will intervene.