Confirm18.com

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.

AppMethod

AppMethod is an application creation and building service. AppMethod allows users to build, design, develop, and manage applications for various platforms, such as mobile, web, and tablet. The AppMethod API allows developers to access and integrate the functionality of AppMethod with other applications and to create new applications. Public documentation is not available; interested developers should start here: http://www.appmethod.com/getting-started-videos