Any saxo user has used saxo to invest S&P 500 more than and equal to SGD $10K? Would like to know how is the charges like and it is worth using Saxo to invest?

If you are investing into the S&P 500, you may want to consider investing into an Irish-domiciled ETF (CSPX/IDUS/VUAA/VUSD) instead of a US-domiciled ETF (SPY/IVV/VOO) as they tax dividends at a rate of 15% instead of 30%.

I suggest using other brokers instead - Saxo charges 0.12% p.a. in custody fees and 0.75% in currency conversion fees. Interactive Brokers and Standard Chartered are both better options.

TD Ameritrade charges anyway no fees on trading U.S. equity, recently