The Paymentwall Local Android SDK by Paymentwall allows to accept over 100 payment options in more than 200 countries of the world. Developers can import the SDK in a new project to experiment with in-app payments without using additional browsers. Paymentwall features include eCommerce, marketplace, and sales.
Science Rockstars aims to transcend simple recommendation engines and A/B testing techniques to create personal profiles of pitches that persuade individually. Their Persuasion API allows applications to compile profiles of each customer and what sways them. Then, based on the profile, communication can be altered in real time in ways that best suit the customer and increase the conversion rate. The documentation notes that it can be implemented either on the server or client side (the latter includes a Javasctipt library to facilitate the process).