What Check on Alexa does? It regularly checks Alexa skills so you can see the resquest/response on this site without having to go to AWS or to run them on your Alexa device.
How does it work? No rocket science. It sends the requests and gets the response. Both are stored on this site.
This utility was developed for my own use and then I thought to share it with other Alexa skills developers. The basic plan is and will be free. At some point, improved functionality will be offered as premium.