I am quite confused with the purpose of shards. How can I use it in the market?
Shard(s) is the major rewards unit earned by users inside our Community Hub, including BullRun and bounty campaigns, and:
NOT a crypto asset or currency - which is neither tradable nor withdrawable;
fungible and exchangable for exclusive offers and prizes;
redeemable for TrueUSD(TUSD) at the rate of: 200 Shards = 50 TUSD.
Here to see more
https://support.plutux.com/community-hub/general/reward-structure-in-bullrun 