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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.

Coin Marketplace

STEEM 0.16
TRX 0.13
JST 0.027
BTC 58615.18
ETH 2559.55
USDT 1.00
SBD 2.52