# Miami Heat's social media mistake fuels $245 million in bets A mistakenly shared video about LeBron James' transfer sparked a betting frenzy. - **Source:** [Fortune](https://fortune.com) - **Published:** 2026-07-23 - **Topic:** [Business](https://brifing.si/c/business) - **Original article:** - **On Brifing:** https://brifing.si/s/18d31710-c8f8-43ce-adb8-eb988408cb8f ## Accidentally shared video The Miami Heat mistakenly published and then deleted a video titled 'LeBron James Introductory Press Conference.' This error fueled speculation about James' free agency status and triggered significant activity in prediction markets. ## Impact on betting markets After the video was posted, the probability of LeBron James joining the Miami Heat surged by 20% on betting platforms. Polymarket and Kalshi saw a total of $245 million in bets, triple the amount from just a few weeks prior. ## Record betting volume Bets on LeBron James' next team reached $211 million on Kalshi, making it the platform's third-largest market ever, trailing only the 2026 World Cup and 2028 Democratic presidential nomination markets. ## Sports and betting industry Prediction markets are experiencing rapid growth in sports and political betting. Kalshi and Polymarket's monthly volume hit $24 billion by April, creating a new market beyond traditional sports betting. ## NBA's response The NBA argues that free agency betting markets like LeBron James' should not exist, claiming they could influence team operations and spread misinformation. Kalshi is fighting in court to keep offering these markets as financial products. ## New dynamics in sports The LeBron James case highlights how social media and betting markets are intertwined in sports. Fans and investors now incorporate even the smallest team actions into betting strategies, reshaping sports management and media tactics. ## Sources covering this story - https://fortune.com/2026/07/23/miami-heat-lebron-james-prediction-markets-mistake-social-media-post/ — --- _Summary written by Brifing from the original reporting. Copyright in the original article belongs to its publisher; read the full piece at the link above._