Why the ICBC credit card in Ireland will be settled in US dollars? There may be several reasons:

1. Currency conversion: Ireland uses the euro as its national currency, and ICBC credit cards are usually denominated in RMB. In cross-border transactions, currency conversion steps may be involved. Therefore, when you pay with an ICBC credit card in Ireland, the Euros may be converted to USD before the USD is credited to your account.

2. International transaction settlement: Cross-border transactions between Ireland and ICBC often go through international payment systems, such as Visa or MasterCard. These international payment systems usually use US dollars as the settlement currency. So even if you make a purchase using an ICBC credit card in Ireland, the transaction will ultimately be settled in US dollars.

It should be noted that the specific situation may vary depending on the individual card type and merchant settings. Therefore, if you still have problems using your credit card in Ireland, it is recommended to contact the customer service of the Industrial and Commercial Bank of China to learn about the specific settlement methods and currency conversion rules.