The Truth
The reality out there is that there is no such thing as a No Denial Credit Card Casino. Online casinos just alike any other company use the same network that any other financial institution would make use of. As a result you as a customer have to go through the same checks and balances as you would when purchasing anything else with your credit card.
Sometimes there reasons why your credit card has been rejected with the most obvious being you’ve reached your limit, but sometimes the reasons for the decline aren’t so obvious; for example sometimes credit card processors don’t accept payment from credit cards issued from other countries except the country of origin. This can be especially true when buying credits online, you’re in Europe and the processor is in the United States.
Other reasons can be that it’s against the law as is the case with UIGEA in the US and it’s impact on online gambling.
The Facts
Some reports that have been circulated in the news and other sources indicate that the average acceptance rate on various cards can be between 50% to 64% depending on the card, processor and your location with Visa having the best acceptance rate at the casino.