Based in Spain, 4B is an online payment service that facilitates payments by card. 4B isn't linked directly to one particular bank, instead it is a network of Spanish banks under the banner Sistema 4B.
After registering with a Sistema 4B affiliated bank, customers are provided with a credit card linked to their bank account. From there, it is a case of visiting an online casino and using the card as a payment method to deposit funds. The cards are free to use and may also allow withdrawals, although online casinos often have a cap on the maximum withdrawal amount.
It remains a great option for those in Spain who play online casinos.