CHICAGO — Cardi B was part of Bad Bunny’s Super Bowl halftime show. What she did exactly, well, that turned into a perplexing question for two major prediction markets. At least one Kalshi trader filed a complaint with the Commodity Futures Trading Commission over how the prediction market handled Sunday’s appearance by the Grammy-winning rapper. The result of a similar event contract on Polymarket also drew the ire of some users on that platform. Prediction markets provide an opportunity to trade — or wager — on the result of future events. The markets are comprised of typically yes-or-no questions called event contracts, with the prices connected to what traders are willing to pay, which theoretically indicates the perceived probability of an event occurring. The buy-in for each contract ranges from $0 to $1 each, reflecting a 0% to 100% chance of what traders think could happen. More than $47.3 million…
