Okay I sent them a small amount of BTC for trading. Amount that I can lose for experimentation. They seem to do rounding down to 4 decimals when depositing. So 0.000523 will become 0.0005. I don't know if that rounding is for display only, but I can't find any evidence that I still have it.
Did you try trading those? Are you able to trade all 0.000523 or just 0.0005 BTC?
all trading is in 4 decimal places only. so no i cant trade those other digits. when i withdrew the full amount, i didn't get those rightmost digits too. so it means they take that amount for themselves when they deposit. also they take 0.0001 "network fee" for withdrawals.
still better than bter where coins used to just disappear.