Credit and debit cards! Many online casinos do not consider them any more as their preferred payment method, but since many players still prefer to use them, all big casinos will accept them.
In the early nineties, the credit cards like Visa, Mastercard and Diners Club used to be the only medium for transferring funds to an online casino player's account. Then came the other payment methods like NETeller with the electronic wallet concept where a direct transaction between a bank and a casino was no more necessary.
Some banks had started blocking credit card transactions with casinos due to risk of fraud and money laundering. Also the fact that online gambling is considered illegal in many countries, has inhibited the banks from doing business in this sector through the credit and debit cards. There is an estimation that more than 50% of transactions with casinos are rejected by the banks, especially in countries like the USA and Germany. But many players still prefer to use their credit cards in spite of security and privacy concerns. Credit cards are also more expensive than e.g. the electronic wallet methods. They are also not as fast as some other methods. But all major casinos offer credit cards as an online payment method.
Credit/Debit Cards face further setback:
In what has been popularly slated as the war against online gambling, credit cards and debit cards, which remained one of the most convenient mediums of payment for users the world over, have been banned from being associated with online gambling, which is illegal in the country. The debit and credit card has been worst affected by the jurisdiction made by the US government.