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Oct 22 (Reuters) - Polymarket is in early discussions with investors and looking to raise funds at a valuation between $12 billion and $15 billion, Bloomberg News reported on Wednesday, citing people familiar with the matter. Polymarket did not immediately respond to a Reuters request for comment. Sign up here. In June, the world's biggest prediction market was close to raise $200 million in a funding round that would value it at more than $1 billion, Reuters reported. Polymarket allows users to place bets using cryptocurrency on real-world events. Prediction markets, where users wager on outcomes across sports, entertainment, politics and the economy — including bets on when the U.S. government shutdown will end and the least-streamed song on Taylor Swift's latest album — have seen a surge in institutional interest since the presidential election last year. Reporting by Anusha Shah in Bengaluru; Editing by Alan Barona