Donald Trump Jr.’s venture firm, 1789 Capital, has injected a “double-digit millions” sum into Polymarket, lifting the blockchain-based prediction market’s valuation to more than $1 billion. As part of the transaction, Trump Jr. will join the company’s advisory board, giving Polymarket a prominent political backer as it seeks a wider audience. The financing comes as New York-based Polymarket prepares to relaunch services in the United States. The platform, which temporarily restricted U.S. users while under federal investigation, returned earlier this year after prosecutors closed their probe. Its recent purchase of derivatives exchange QCEX—holder of a Commodity Futures Trading Commission license—positions the firm to offer legally compliant markets domestically. Polymarket lets participants wager on outcomes from elections to court rulings and geopolitical events, processing more than $8 billion in bets to date. The latest capital follows a nearly $200 million round led by Founders Fund and underscores growing investor interest in decentralized forecasting tools. 1789 Capital, which backs projects aimed at bolstering “American dynamism,” said the stake reflects rising demand for market-based alternatives to conventional polling.