User Interface API Developer Guide

Get Started with User Interface API
User Interface API Quick Start
User Interface API Sample Apps
Supported Objects
Authentication, Versioning, and Limits
Status Codes and Error Responses
User Interface API Features
User Interface API Resources
User Interface API Request Bodies
User Interface API Response Bodies
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Authentication, Versioning, and Limits

Learn the high-level facts about how to use User Interface API. How do you authenticate? How is the API versioned? What are the rate limits? All the information you need, available at a glance.
Authentication
Like other Salesforce REST APIs, User Interface API uses OAuth 2.0. To specify OAuth settings, create a connected app in Salesforce. You can specify the api or full OAuth scopes.
Versioning
User Interface API is versioned. Specify the API version number in each request. 
1GET https://{your_salesforce_instance}.salesforce.com/services/data/v41.0/ui-api
Limits
The User Interface API uses the Salesforce API limits. When you exceed the rate limit, all User Interface API resources return a 503 Service Unavailable error code.