“This means that all interbank payments in Curaçao, Sint Maarten and Bonaire will soon be processed within ten seconds – 24 hours a day, 365 days per year. The Instant Payment transactions will be handled in Antillean Guilders and US Dollars.” Worldline
Centrale Bank Van Curacao en Sint Maarten
The CBCS site states the currency is the Netherlands Antillean guilder which is pegged to the USD.
There are efforts to digitize which has been reported.
There are no immediate plans for CBDCs.