A well-timed Maduro bet on Polymarket paid out big. A new bill would keep government insiders out.

Rep. Ritchie Torres

Alex Wong/Getty Images

• A Polymarket user made over $400,000 off a well-timed bet on Nicolás Maduro's political future.
• The bet was made just one day before US forces captured the Venezuelan leader.
• A congressman rolled out a bill to bar government officials from insider trading on prediction markets.

Someone made hundreds of thousands of dollars off a well-timed bet on Venezuelan President Nicolás Maduro's political future.

Now, a...