Peace be upon you. As for the ruling regarding trading with digital currencies on the Pcex platform using USDT, Ayatollah Khamenei has not issued any specific guidance on this matter. It is advisable to exercise caution and refrain from engaging in such transactions, or alternatively, consult another qualified scholar who meets the criteria for issuing fatwas, while considering the most knowledgeable among them. Additionally, Ayatollah Sistani has not expressed an opinion in this area, and it is permissible to refer to another authority while adhering to the relevant guidelines. May you be successful in all good endeavors.