Blippy and Swipely both launched fairly recently with the hopes of making spending a social experience. Both services are very similar in that they both allow you to connect your bank and credit card info, as well as other accounts like iTunes and Amazon. After you've set everything up, as you start spending, you have the option to share these purchases with everyone. And now you can extend that sharing with the Blippy API.
The key to any transaction whether in the online or physical world is the payment process. Payment is a common feature across desktop, web and mobile applications. PayPal is often the first choice that springs up on developers when they think of integrating payment into their applications. Developers want an easy to use API, sandbox testing, fair transaction fees and definitely less paperwork and wait time. Stripe aims to simplify the process of accepting payments on the Web with its easy-to-use Stripe API.