Tether's could reach a $500 billion valuation. | Credit: Credit: Getty Images. Key Takeaways Tether could be valued at around$500 billion following the planned raise. Tether’s USDT is the leading stablecoin with a market cap of over $173 billion. The firm is launching a U.S.-compliant stablecoin that targets American businesses and institutions. Leading stablecoin issuer Tether (USDT) is planning to raise up to$20 billion through a private placement deal to boost its existing and new business op ...