I’m happy to announce that I created a project using Crystal (and Mint)!
It’s: Base (API as a Service), you can read more about it from this post:
It’s not a big project, for now it’s 2317 LOC.
Also I started to write the first client in Crystal as well: http://github.com/base-api-io/base-cr
Let me know your thoughts and if you have any questions I’m happy to answer them.