The Miami Heat, LeBron James, and prediction markets: How a ‘mistake’ social media post turbocharged a $245 million wager

On Tuesday night, the Miami Heat accidentally published, then deleted, a YouTube video titled “LeBron James Introductory Press Conference,” dated for later this month. A team spokesperson told the Miami Herald the post was a mistake, made while the club prepared materials for “the possibility of James eventually deciding to join the Heat this offseason.”

Shortly after the video was removed, the team reposted an opening for a director of YouTube strategy on LinkedIn. 

James, still a free agent since leaving the Los Angeles Lakers 24 days ago, has given no timeline for his decision. Even his agent, Rich Paul, said this week that nobody—not Paul, not NBA commissioner Adam Silver—knows when it’s coming.

But on prediction markets, Miami is now priced near 50% on Polymarket to land James, and Kalshi has that scenario in the high 40s. Cleveland had been running dead even just a day earlier.

According to Polymarket, the likelihood of James going back to South Beach on the night the video was “mistakenly” posted sat at 31.5%, trailing Cleveland by three points. That one “mistaken” social media post led to a 20-point surge, in other words.

Combined trading tied to James’s next team has topped $245 million across Kalshi and Polymarket, with more than $200 million of that on Kalshi alone. Just weeks ago, the figure was $76 million; a Kalshi spokesperson has since put the total north of $170 million. According to Kalshi, the current market volume of........

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