Yes, for "instant inventory services'' there is an API demo available in one of the plugins.The demo is available on a plugin called "woo choice plugins" which is a powerful and effective plugin for diamond/jewelry websites.This plugin developer also provides a premium extension called Diamond API Integration Extension for any Diamond API integration, this extension support the integration of all popular APIs like Rapnet, IDEX (International Diamond Exchange API), and GEMFIND Diamond Link API.We support any kind of customization like you can use it with Ring Builder, with Independent Diamond Feed Page.