I have had a load of problems with the COSS exchange. I have a couple thousand COSS staked on their exchange and I am getting my payments but I have not been able to trade at all.
On a second note, I strongly recommend KuCoin. I have been using their exchange for 6-7 weeks with no problems. I hold KCS on the exchange and have been receiving payouts. This exchange also offers a lot of new and upcoming tech coins.
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Peace,
The Last Sage