HKD is a separate currency with its own monetary arrangements. The Hong Kong Monetary Authority explains the Linked Exchange Rate System in its public reference material. For everyday account comparisons, the useful distinction is between the balance currency, the card's billing currency and any conversion charged at the time of payment. [2]
Hong Kong dollar
Currency settings
Keep a transaction record in HKD even if an international profile displays bonuses or limits in USD. A larger dollar figure does not automatically describe a larger value. When comparing two payment options, convert the total debit and the eventual return to the same currency before comparing fees.