Just to share my experience with stock.exchanges.

I was really reluctant to go to this exchange but I still did it.

I have made some trades without real problem except that there are some delays when you place an order.

Today I have made a deposit of around 19000 DOGE and it appears only .... 8 Hours later ! (and of course no answer to my ticket)

I saw they retrieved my dogs, 10 minutes after they received it.  (proof : https://dogechain.info/address/DDyp42F1KGL8V4HKgtm8sbin1NvdEQPLnD )

So to sum up, they hold my DOGE for free during 8 hours.

But I receive my coins, so I don't think it is a scam but they have serious problems and their website is very very very buggy.

I won't return to this exchange and I wouldn't recommend it.