PayPal is smart to engage developers in the early stages of releasing this new API. The company also partnered with TechCrunch50 demopit startups FundRazr and Lottay to build off the adaptive payments API. In fact, PayPal’sPayPal X Innovate 2009 conference in November is designed to attract more developers to the platform. The new APIs will only be released to those developers that attend the conference. Although, we scooped the news of the new Adapative Payments API, PayPal says that additional APIs will be announced at the conference. It should be interesting to see what these APIs enable developers to build, considering the impressive vision PayPal has for the future.