I understand that there are one-time use credit cards that work only once or work only at one website. Do these significantly help reduce fraud and which credit card companies have them -- I know Discover does because I use that one. But I haven't seen similar ones from VISA or MasterCard.
Are there other features that Credit Card companies have that will significantly reduce a credit card being used fraudulently by other people at other sites?
You can get one time use cards for online purchases, however there are already safeguards in place, regulation E, which says if there is fraud on your debit/credit card and you notify your financial institution of this fraud in a timely fashion which is 60 days upon receiving your statement or two days upon discovering the fraud, the bank will issue you credit. When a charge is disputed with the bank, they send a chargeback notice to the online merchant, debit the merchant account in the amount of the fraud and issue credit to the account holder. It is the online merchant's responsibility to match up billing and shipping addresses and ensure that the charges are authorized. So, in answer to your question, use your existing card and monitor the statement closely.