Polymarket

Reasons to avoid

1. Ignored fraud warnings to keep growing

   A Wall Street Journal investigation found that Polymarket's payment processor rejected more than 80% of its US card deposits as fraudulent at one point, against an industry norm of about 1%, after fraudsters tried to steal at least $10 million with stolen debit cards. According to the report, CEO Shayne Coplan told staff to focus on growth now and worry about regulatory fines later, while the company dropped a safeguard requiring withdrawals to go back to the original payment source.wsj.com·2026-09-20

2. Advisory board member urged against regulation

   Donald Trump Jr. told a gathering of Republican state attorneys general in New Orleans that gambling companies were pushing states to regulate prediction markets like Kalshi and Polymarket to protect their own monopolies, and urged them not to pursue new rules. The remarks came as Trump Jr. serves as a paid advisor to Kalshi and sits on Polymarket's advisory board with a stake through his venture firm 1789 Capital, both companies whose federal regulator answers to his father's administration.nytimes.com·2026-08-27

3. Paid creators to fake winning trades

   A Wall Street Journal investigation published in June 2026 found that Polymarket paid social media creators to stage trades across a five month campaign of more than 1,100 TikTok videos that reached 140 million views. About 70% of those videos depicted apparent bets totaling $1.9 million staged on dummy websites rather than Polymarket's real platform, and a subset of 118 videos falsely showed nearly $900,000 in winnings when the identical real trades would have lost over $166,000.cbsnews.com·2026-06-20

4. Nevada judge barred it as gambling

   A Nevada judge granted the state's motion for a preliminary injunction in June 2026, blocking Polymarket from offering sports, election, and entertainment contracts to state residents. The ruling made Polymarket the third prediction market platform barred from operating in Nevada after Kalshi and Coinbase, with regulators arguing its event contracts amount to unlicensed gambling under state law.reviewjournal.com·2026-06-02

5. Regulated by agency under advisor's father

   Donald Trump Jr sits on Polymarket's advisory board and has invested in the company through his venture firm 1789 Capital, while the Commodity Futures Trading Commission that regulates prediction markets answers to his father's administration. He also advises Polymarket's biggest rival Kalshi, and the two companies together spent nearly $1 million lobbying federal regulators in 2025.cnbc.com·2026-04-15

6. Wash trading faked 25% of volume

   A Columbia University study published in November 2025 found that nearly 25% of Polymarket's trading volume over three years, about $4.5 billion in transactions, was wash trading where users traded with themselves or coordinated accounts to fake market activity. The fake volume peaked at 60% of weekly trading in December 2024 and was worst in sports markets at 45%, undermining the trading data Polymarket promotes as a real time gauge of public opinion.bloomberg.com·2025-11-07

7. Fined $1.4 million for unregistered trading

   The Commodity Futures Trading Commission fined Polymarket $1.4 million in January 2022 after finding it had operated an unregistered facility for event based binary options trading since June 2020. The order required Polymarket to wind down its noncompliant markets and blocked the company from serving United States customers for years afterward.cftc.gov·2022-01-03