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Sorry for the late reply. Turns out you can do it through Huobi. It doesn't require registering as a trader, or a license, or anything like that. I thought it would, but it worked with just an e-mail address.

Thank you!
so, first I transfer STEEM, then use that to buy USDT and then use that to buy ETH?

I transferred Steem to the Huobi account with the proper memo, then used that to buy ETH directly.