I wouldn't call it "highly secured", it's just not totally terrible. You still have common Diffie-Hellman parameters and don't support forward secrecy. I also wouldn't call it "highly secure" as long as you're hosting it with a bunch of other stuff. If any of your "other services with about 20000 active members" gets hacked it'll also impact this Microwallet Service.

Is there English version? I get Russian version after clicking "Getting started".