The Developer APIs provide capabilities that give developers insights into their API integrations. For example, the Developer Analytics API provides key information about your application's API usage and how that compares with the rate limits established for each API or API method. Some APIs, such as the Catalog API, enforce rate limits for individual users, as well as for applications. Using the Analytics API, you can you check rate limits and API usage for both an application and for individual users.
Note: The Developer Analytics API applies to eBay's RESTful APIs only. The GetApiAccessRules call in the Trading API reports similar usage information for the Trading API calls.
eBay plans to expand the capabilities of the Developer APIs to provide application developers with more information that will help them better understand and manage their eBay API integrations.