How much commission do they charge?

https://www.utrade.com.sg/home/index.jsp    

UOB Kay Hian is owned and operated by UOB KAY HIAN PRIVATE LIMITED, a company authorized and regulated by the Monetary Authority of Singapore (MAS).

As for the question you asked, we recommend that you ask the official customer services directly for a more accurate answer. For more details on this broker, you can check our full UOB Kay Hian review.