VigLink is a service that embeds affiliate links where possible to make a publisher money from referrals and other purchases. The VigLink Catalog API allows users to access a searchable database of products which includes prices, images, descriptions, and additional information. The API uses REST calls and returns XML. The VigLink Catalogue API makes it possible to create price search and comparison engines in third party applications. An account is required with service and an API key is used for user authentication.