According to Upbit's announcement, due to the block generation delay issue on the Stacks (STX) network, Upbit has suspended the deposit and withdrawal services for STX.

Upbit stated that the suspension will last from the time of the announcement until the network stability is confirmed, at which point users will be notified through an announcement about the resumption of services. The exchange particularly reminds users that depositing STX to the Upbit wallet address during the suspension may result in funds not being credited and being unrecoverable.