As ERC20 token is frozen and mapped to "mainnet token". So for now, is there a way to trade mainnet token using USD or BTC?
The problem is about exchanges, they have not yet been ready for user to deposit their EOS. Now ERC20 token is frozen and illegible to trade what people are trading now is the representative of their holding of EOS on exchanges.
Besides, similar to any user, exchanges have to create account name to be able for user to deposit their EOS. I guess it's quite different from other cryptocurrencies so it would take more time for them than usual for security reason.
Now mainnet is online and what people are waiting for are exchanges not EOS community neither Block.one