Polymarket announced enhanced market integrity rules on March 19, 2026 - applying uniformly to its Polygon-based DeFi platform and its CFTC-regulated US exchange.
The revisions expand transparency mandates and insider trading prevention mechanisms. They follow Polymarket’s November 2025 US Rulebook and respond directly to scrutiny from its $3 billion 2024 US presidential election trading volume - a period that elevated the platform into mainstream political discourse and triggered concerns over manipulation.
The new framework was coordinated with the Commodity Futures Trading Commission and embedded into Polymarket’s integrity agreement with Major League Baseball - marking the first major sports league partnership for a prediction market. It includes restrictions on high-risk markets and real-time surveillance of large or anomalous positions.
CEO Shayne Coplan calls Polymarket “the most transparent financial marketplace that has ever existed,” citing on-chain verifiability as a structural advantage over traditional betting platforms.
For retail traders, tighter oversight means reduced front-running risk. For institutions, it signals regulatory readiness - a prerequisite for capital allocation. Competitors like Kalshi operate under CFTC oversight, but Polymarket uniquely bridges decentralized access with regulated credibility.
Enforcement remains the challenge: pseudonymous wallets and cross-chain activity test the limits of on-chain transparency. Still, the bet is clear - legitimacy, not evasion, is Polymarket’s path to scale.