Brokerage app Robinhood has quickly become a force in prediction markets, challenging the hold of Kalshi and Polymarket on the popular betting market.

Robinhood’s prediction markets revenue surged more than tenfold year over year in the second quarter to $156 million, the company reported last week, as part of its second-quarter earnings update. Prediction markets accounted for 20% of Robinhood’s trading revenue in the quarter, eclipsing both stock and crypto revenue for the first time and becoming its second-largest trading business after options.