Open interest across prediction markets has climbed from roughly $1.1 billion in August to a record $2.8 billion last week. That’s a huge jump in just a few months, showing that more capital is being committed to predicting real world outcomes, from politics and economics to crypto and major global events. But the market is heavily concentrated. Kalshi controls around 71% of total open interest, while Polymarket holds roughly 24%. Together, the two platforms account for about 95% of the market. The growth is impressive, but the concentration is worth watching. Prediction markets are expanding rapidly, yet a large share of the capital is still flowing through just two platforms. #BTC Price Analysis# #Altcoin Season# $BTC $ARB