To get metadata about fields such as the user defined display name, maximum mask, field type, whether it is required or read-only, use the $fields keyword.
For example:
http://restapi.lucity.net/gbaMS/Work/Requests.svc/$fields
See Also
Special Functions
Getting Record Counts: $count
Getting pick lists: {PropertyName}/ and {PropertyName}/$count
Caching support on lookups
Special lookups
Getting a new empty object: $new
Discoverability
Document attachments, uploads, downloads
Working with Existing Filters: $filters and $myfilters
Errors
Commands
Tools
Clearing Cached Data: $cache
Warnings and Conflicts
Getting live updates based on property changes made by an end user
Secure Fields
ObjectCanBeEditied,ObjectCanBeDeleted
SQL Injection Considerations