I was planning to trade LTC/USDT pair and discovered that Tether.to is not accepting new registrations. Is there any way I can use it? Can I still get an online wallet like omni wallet or exchanges wallet and store it there? Does omni or exchanges give private key to the wallet? I'm a complete noob here, enlighten me please
before you proceed with the trading, please be informed that Tether is a centralized currency and claimed to be backed up by real dollars. However, no one is sure about the legitimacy of this claim. So understand the risk before you move to trading. The only good thing is that the price of this currency is somewhat stable to $1.
Now coming back to your original question. Exchanges won't give you a private key, it will just give you an address to store your Tether. So if you are not planning to trade with a significant volume, you can still use exchange address. But it is not recommended for huge volumes. I am not experienced in Omniwallet, so I won't be able to assist you with that. But my little search shows that you can import your existing wallets into Onmiwallet as well as export/backup them. But I may be wrong here.
Another wallet you may want to try is Bitshares wallet. It has an integrated order book with the wallet so you can trade directly from your wallet. You can give it a try as well. Also let us know your findings.