The Coinkite Python SDK by Coinkite allows API interaction, providing authentication, receipt rendering, and transaction authorizing. Coinkite API is available at https://docs.coinkite.com/api/index.html
Violet this week announced what it says is a "unified API for anything on the internet." The idea is to make it easy for people to buy whatever they want, no matter where they see it on the web, without requiring them to backtrack or hop through ecommerce sites across the internet.
Zinc bridges the gap between bloggers and content creators and the retailers that sell the products reviewed and covered. The Zinc API allows anyone with an online presence to add a few lines of code to a site or app and seamlessly add ordering functionality. Zinc integrates with various online retailers; so, readers/consumers no longer need to leave a site to order a product from a major online retailer.