Are there hidden trading fees when DCA monthly into stashaway and syfe?

For Stashaway and Syfe, the stated management fees are pretty much what you pay. The ETF expense ratios are quite similar too, about 0.2% p.a. for Stashaway and 0.15% p.a. for Syfe.

For both, you do incur currency conversion charges each time you deposit SGD into their USD portfolios. It's 0.09% on the amount converted for Syfe, which is quite low.

So overall, it doesn't make much difference between monthly or quarterly DCA!

I believe it's factored into the management fee already. So no, regardless of how often you DCA, be it every quarter, month, week or day, you won't be incurring additional fees on your end.

Source:

https://www.stashaway.sg/pricing

https://www.syfe.com/pricing​​​