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On most Stellar DEX platforms coins are ranked by trading volume. The goal of this competition is to encourage trading STEEM and SBD on Stellar so we can climb up the ranks - hence the trading requirement.

It's just my opinion so take it for what it is, but the prize doesn't really reflect the effort required here.

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STEEM 0.25
TRX 0.14
JST 0.033
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SBD 4.19