Polymarket is expanding its partnership with Solidus Labs to deploy the HALO trade surveillance system, aiming to detect market manipulation and insider trading on its prediction market platform. On April 29, 2026, Solidus Labs published a report titled Polymarket Under the Polygraph revealing wash trading patterns and extreme profit concentration: under 1% of wallets in key political markets captured roughly 50% of all profits between December 2025 and February 2026. Both major prediction market platforms, Polymarket and its main competitor Kalshi, are now using the same surveillance provider, giving Solidus Labs visibility across the two largest venues in the space. For traders on Polymarket, HALO’s pattern recognition will make manipulative strategies harder to execute undetected, with flagged accounts potentially facing enforcement action ranging from trading restrictions to outright bans.
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