The Base Commerce PHP SDK is a pre-built library that implements the Base Commerce API (which integrates Credit Card Processing, ACH processing, Secured Vault, and a Push Notifications Platform). The Base Commerce SDKs are available in other languages as well. This allows developers to drop the library into applications and start communicating with the Base Commerce platform.
X.commerce is the new brand for the developer commerce tools that include the eBay API and PayPal API. The first conference under this new brand is coming in October to San Francisco. As a media partner, we have a promo code, as well as a little more information about how the company is looking to create a sum greater than its parts with the X.commerce platform.