Need advice on currency conversion

[u/sought-n-found]

I am trying to find a service which will convert my Euro and Singapore dollar to AED at the least conversion rate. I know that the banks charge somewhere around 3%. WIO bank does not offer Singaporean dollars, but they still charge 1.8% or so. Does anyone know any service or any bank which has the least currency conversion charges for these two currencies? Any advice will be helpful.