Koineks Teknoloji A.Ş, known online as Thodex is a defunct Turkey based cryptocurrency exchange founded by Faruk Fatih Özer. Thodex was the first global exchange based in Turkey and of the 40 cryptocurrency exchanges in Turkey at the time, it was one of the big ones. It had 391,000 users when it froze in April 2021 and the owner fled Turkey with the clients money.