The forecasting platform Polymarket stated on Tuesday to CNBC that the company's annual revenue has exceeded $1.8 billion.

This figure is higher than the level seen in June. At that time, Polymarket disclosed that after launching its domestic exchange in the United States in May, the company's annual revenue operating rate had exceeded $1 billion.

The revenue growth of Polymarket is mainly driven by the expansion of its US exchange. This US exchange operates as an independent trading venue and is separate from its decentralized finance international platform. According to data from the analytics platform TickerTracker, the nominal trading volume of this local exchange in October exceeded $14.5 billion, which is higher than the $4 billion in June.

This growth was driven by a series of transactional events, including the FIFA World Cup in the summer and the NFL season that began in September. Trading volume was also supported by the increasing popularity of Combo event contracts. These contracts operate in a manner similar to multiple bets in sports betting, accounting for over 70% of the platform's trading volume on Sundays.

The revenue growth since June also occurred after the company launched a new round of financing worth $1 billion; this round of financing valued Polymarket at $21 billion.

However, Polymarket still faces resistance recently. The Commodity Futures Trading Commission (CFTC) of the United States is conducting a thorough investigation into the company, focusing on its advertising practices and whether the company has violated a settlement agreement reached with the agency in the past. According to that agreement, U.S. residents are not allowed to access its international exchanges.

The company may also face stricter scrutiny from Congress, which is controlled by the Democratic Party, partly because Donald Trump Jr., the son of U.S. President Donald Trump, serves as an advisor to the company.

However, Polymarket previously told CNBC that as legislators begin to understand the growing predictive market industry, the company will cooperate with them. A spokesperson stated, "We welcome the scrutiny."

Disclosure:CNBC has a business relationship with Kalshi, which includes customer acquisition cooperation and a small amount of equity investment.