As it is reported by Techvoid, on January 1 Coinbase cryptocurrency exchange sent emails to its users this morning warning them about credit card companies which are changing MCC code. MCC code is ususally used to classify the business by the type of goods or services it provides.
Coinbase email regarding MCC code
Coinbase stated that the changes may affect the cost of purchasing cryptocurrency with credit cards, setting it higher than it used to be. The number of major credit card issuers has changed the MCC code, which will increase the fees, and Coinbase warned users that those fees are not collected by Coinbase itself.
Moreover, Coinbase recommended its users to switch to the bank account or debit card so as to avoid the high fees for transactions.