The Bulgarian National Bank (BNB) establishes specific selection criteria for counterparties participating in open market operations executed via quick tender procedures. For fine-tuning operations, the BNB applies prudential and efficiency standards for foreign exchange swaps while prioritizing money market activity for reverse transactions and fixed-term deposits. The Governing Council of the ECB retains the authority to authorize a wider range of counterparties, and the document defines key terms such as quick tender and foreign exchange swaps.