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It's a decentralised exchange created by the co-founder of Steemit @dan.

It is basically an app you download to your computer then you have access to a range of trading pairs. Honestly I haven't used it much, I don't trade that often but it seems great. I am sure it has less liquidity than polo but its not a centralised exchange with all the associated counterparty risk.

https://bitshares.org/

Thanks. I will add it to my research list.

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