While most online casinos are completely trustworthy and should be used safely, there may always been a worry at the back of your mind. The fact is, most casinos can be used regularly without any concern about your financial information. But, if you are still worried, stop and take the time to learn about the company. Do some basic research about them and check out the forums they may have online. Find out how safe they are to other users.
In addition to this, monitor your credit activity carefully. If you notice any charges that you did not agree to, contact the casino and your credit card company to fight them. In most cases, the credit card company will back you up and not require you to pay for anything like this. Again, it is rare you will find an online casino in the US that you cannot trust, at least with your financial information.