The Administrative Tribunal of the European Stability Mechanism (ESMAT) is an international administrative tribunal hearing appeals brought by current and former staff of the European Stability Mechanism (ESM), which is an international organization. Sitting in Luxembourg, though separate to the European Union (EU) and outside the EU legal order, the Tribunal has its own Statute and Rules of Procedure to supplement the ESM Treaty. As ESMAT reaches the age of ten, and having delivered its first judgments, this articles probes ESMAT’s legal design and rulings to-date to determine the credibility of the international administrative tribunal in providing redress, as an internal justice regime in a standalone international organization. It finds that despite the preadolescent age of ESMAT, it is a well-designed international tribunal, established by law, and can provide the necessary judicial remedies to parties where necessary, given its applicable law.