If a website requires the ability to verify that a user has a valid credit card without making a purchase, than this is the tool to use. Forward visitors to Confirm18.com to verify the authenticity of a credit card, accepting the following inputs: it's first six digits, the name of the affiliated bank, and the type of card. (VISA, Mastercard, AMEX, etc.). This makes this tool ideal for situations where you need to limit access to users over 18. If a user passes this confirmation test, they will be returned to the original site. 18confirm.com is a free service that inculdes easy developer integration.