Stateful is a Pebble watchapp designed to control RESTful API's with minimal clicks.
The watch interface is split up into distinct 'tiles'. A tile in stateful is a grouping of up to 6 button clicks, each of which can call a RESTful endpoint with arbitrary data.
Each tile has an overflow menu that can be accessed by long pressing the middle button.
Multiple tiles can coexist. There is a menu system which allows navigation between tiles:
Head over to the Wiki for more information on usage.