1. Website: Many websites provide real-time update information of American stock futures index, such as Bloomberg, CNNMoney, YahooFinance, etc.
2. Trading platforms: Many securities trading platforms provide real-time update information of the US stock futures index, such as TDAmeritrade and E*Trade, which can be queried here.
3. Mobile applications: Many financial companies and securities trading platforms provide mobile applications, and search can view the information of American stock futures indexes at any time, such as Robinhood and Fidelity.