# Introducing the Express APIs (video)
What APIs does Signicat Express offer, and what can you use them for? Learn about the Authentication API, the Registry lookup APIs, and the Signature API.
Itching to try it out on your own? Create a free user and enter our test environment:
You can learn more about each API in the corresponding sections of the documentation:
Questions, comments, or suggestions? Check out our community (opens new window).