Redirect 2 Link - Redirect 2 Link allows you to securely share links while being able to control the social preview.
Shorten.REST - A URL shortener API you can depend on
Short.io - Short.io makes short links (vanity urls) on your own domain. Free signup, analytics and API. Chrome, slack, zapier and segment integrations.
PixelMe - URL shortener for savvy marketers
cmpct.io - The shorter, safer, more useful link shortener
Pixela - Record and Track your habits or effort. All by API.