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the steemit market only allows trading between steem and sbd. These DEXs allow you to trade against a multitude of cryptocurrencies including steem. Cheers!

Thanks for the explanation! Still getting my bearings around the Steemit community. :)

Daniel Larimer invented one of the original successful DEX: BitShares in 2014, and Steemit (2016.)
If the name sounds familiar, it is because he is also behind EOS (2018.)