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Kalshi and Polymarket draw scrutiny over unusual long-shot trading volume
- Kalshi and Polymarket draw scrutiny over unusual long-shot trading volume — Bonus reports observers flagged unusual long-shot volume on Polymarket, including about 56 million dollars traded on an outcome priced at 3 percent or lower in an Ethiopia prime minister market, while Polymarket denied wash trading and pointed to algorithmic traders exploiting mispricing. A Columbia University study cited in the report put patterns indicative of wash trading at 20 percent of weekly volume by October 2025, down from 60 percent in December 2024. (Bonus.com)
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