Is there a limit on how many transactions can be fetched through Mastercard Open Banking?

There is no limit on transactions when you fetch them through Mastercard Open Banking. You receive transactions in pages with a maximum of 250 transactions per page. Due to PSD2 regulations, there is a limit to how far back we are allowed to fetch transactions. This limit is two years from the creation-date of a new user account. If the transaction is older than two years, it will be deleted.