Are there any international banks in Beijing?

Are you asking about foreign banks? When you mentioned international banks, I thought of Xiamen International Bank, which has a branch in Beijing.

As for foreign banks, there are many in Beijing: Standard Chartered, HSBC, Citigroup, Morgan Stanley, Société Générale, Mitsui, Asiana, etc., there are a lot of them. You can check it on the website of the China Banking Regulatory Commission (Beijing).