Kalshi says it has blocked "dozens" of trades from campaign insiders, but experts say the company's approach leaves lots of potential loopholes. NPR has found at least one trade that slipped through.

Mark Zuckerberg met with Kalshi's CEO last year about a potential deal, but talks did not move forward. Now Meta is making its own prediction market app.

Influencers are using prediction market odds to sow doubt in vote counting, in some cases in posts paid for by the companies themselves.

NPR reported on new federal investigations examining the former Congressman's bets on the prediction market site Kalshi. Then he threatened the NPR reporter who broke the story.

The disgraced former congressman allegedly bet on whether he would appear at the State of the Union address, prompting federal investigations.

While dozens of states have taken legal action against the controversial industry, Minnesota is the first state to pass a law making it a felony for companies like Kalshi and Polymarket to operate.

The suits are the most ambitious effort to date that the Trump administration has gone to try to override state laws and set the rules for the fast-growing and increasingly divisive betting industry.

Arizona is the first state to allege the prediction market company has committed criminal violations, accusing it of running an unlicensed gambling operation.

Traders on prediction markets bet on nearly anything. One made more than half a million dollars betting on the U.S. strike against Iran. But should people wager on human suffering?

The 20-something billionaires who run Kalshi and Polymarket are battling it out to be the top prediction market company. Observers and former insiders say the feud is just heating up.

With prediction markets booming, so have concerns about insider trading. Now, Kalshi has disclosed its first public actions against accounts suspected of trading on confidential information.

As prediction markets boom, competition is heating up. So traders go the extra mile for a fraction-of-a-second advantage or to sleuth out information nobody else has. It can lead to a huge payday.

Apps that let people wager on current events have experienced explosive growth in Trump's second term. But one of the leading markets is tied up in lawsuits that cloud the industry's future.

Prediction market apps are thriving in Trump's second term, with traders betting on migrant deportations to election outcomes. A community of young, mostly male and very online traders are driving the industry's bonanza.