Product Advertising API
Developer Guide (API Version 2013-08-01)

How Do I Make Money Using the Product Advertising API?

Use the Product Advertising API to advertise Amazon products with Amazon Associates and earn referral fees when customers buy qualifying products.

You need to register for an Amazon Associates account and ensure that you include your Associate Tag in all requests. Product Advertising API returns URLs that have your Associate Tag. When a customer visits an Amazon marketplace through a tagged link and buys a product, you earn referral fees. For more information, see Becoming an Associate.