Topbtc cryptocurrency Exchange Company is based in Australia. It is owned by DABTC PTY Ltd. DABTC was initially China based but when China banned cryptocurrency, they moved to Australia where they opened TopBtc. That is why you can see some previously used assets of DABTC in TOPBTC.
Trading: Real Crypto Trading
Cryptos: BTC, ETH, LTC, BCH, EOS
Trading Fees: Taker Fee: 0.20%, Maker Fee: 0.20%
Although most Australian exchanges have identified with ADCA (Australian Digital Commerce Association), TOPBTC is yet to do so. This is not to discourage you because the company may still have the capacity to make you happy.
It is not yet clear if this company does not want to be friends with US investors. Therefore, it may be safe for those who are from the US. Such ones should endeavor to know what their state rules say regarding their membership.