A Democratic “blue wave” in the U.S. midterms turned into a windfall for one Polymarket trader — but it’s a payoff still hanging on one late-counted state. On Polymarket’s daily leaderboard, user 0xA2 emerged as the platform’s most profitable trader over the past 24 hours, showing about $917,000 in profit. Much of that headline number is unrealized and tied up in a single, high-stakes position: 0xA2 put $609,644 on Republicans failing to win any Senate swing states when the market price implied only a 36% chance of that outcome. As the market raced to roughly 87%, that stake swelled to about $1.48 million, putting the trader roughly $860,000 “in the green” on that bet — but the payout still depends on Alaska’s final result. Polymarket participants currently assign about a 14% chance to an upset there, a small probability but one large enough to flip these gains. 0xA2 has already banked some wins: the trader realized $106,115 by correctly predicting a Democratic victory in the Texas Senate race. In the oddball column, their second-largest active position is a $1.42 million bet that the U.S. will not confirm the existence of aliens before 2027. The midterm surge illustrated how quickly prediction markets move when traditional exchanges are closed. Kelly Ye, head of research at digital asset manager Talos, noted the speed of price action on election night — citing a comparable site, Kalshi, where odds for a Democratic sweep jumped from roughly 74% to 99% as polls closed — and said trading peaked between 8pm and 10pm ET, driven by a few large wagers. It was a big day across the platform: Polymarket’s top 10 users each profited handsomely, with the leaderboard showing more than $170,000 in gains for the top ten combined. For context, on a typical day in March the platform’s leader made about $154,000 and the tenth-place winner about $29,700. Activity on Polymarket and rival Kalshi mirrored broader interest in prediction markets: data from Prediction.com put notional volume across midterm markets at more than $546 million over the prior two weeks. Prediction.com’s pseudonymous data lead, Dash, called the 2024 election cycle “the breakthrough moment for prediction markets,” saying the midterms were the first major real-world stress test that drove volume and open interest. Polymarket’s presidential-season flagship market alone topped $3.6 billion in volume, and its traders frequently diverged from traditional polls — users favored Trump for much of the campaign even when polls showed a closer race — a discrepancy that has led some to view markets as superior forecasting tools. But markets are not infallible. Two weeks ago Polymarket markedly underpriced Luiz Inácio Lula da Silva’s chances in Brazil’s presidential election — putting his win at roughly 20% before he ultimately prevailed. Experts pointed to a local prediction-market ban and traders’ limited on-the-ground knowledge as factors that distorted odds. As CoinShares researcher Luke Nolan reminded observers: an 80% favorite still loses one time in five; a 14% upset probability is small but meaningful. For 0xA2 and other big winners, that reality matters. The midterms produced eye-popping headline profits — but a late swing in Alaska or another surprise could erase a large share of those gains. Prediction markets can move faster and sometimes more accurately than polls, but they still carry real risk. Read more AI-generated news on: https://app.chaingpt.org/news
