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Well, 300m USD represents 1.8% of the entire market cap of UST.

For HBD that would be around 430k USD if we take into account all HBD (including DHF) or about 160k USD if we consider only the 9m HBD that is free-floating.

I guess nobody sold 160k HBD at once on Upbit or Bittrex yet to see what happens with the price. Before something like that happens, I hope we will have other markets included for HBD, like pHBD-USDC.