USDice is a scam! I deposited about 0.4 BTC over a couple months with USDice. Everything seemed fine and then I eventually started winning and got my account balance to just over $26K USD. They limited my account, which is fine and not overly abnormal. I went to withdraw my winnings and they would only allow $500 USD at a time. My first withdrawal took about 10 calendar days and I had to follow up 3 times with them. After I requested my second withdrawal of $500 they said they needed to do a review of my account. This review took 3-4 weeks and they determined that I they are not going to pay me because they believe I have as betting with a syndicate, which I absolutely was not. They said they would return my deposits but would not pay out my winnings. After doing some research I decided it wasn't worth my time to try and fight this and I would accept my deposits back. A little more than a week has gone by now and they still have not returned my deposits.
Long story short, USDice will gladly accept your deposits but will keep your money if you win. This is an absolute scam!