The url is just a redirection to this:
4 karma · joined January 5, 2017
It's essentially a way to save some money by avoiding long http requests by buffering requests and sending a callback when the result is complete.
You can create a mailbox in less than 30 seconds, doing just three steps:
1 - Insert the username for the email.
2 - Choose the domain.
3 - Select the expiration time.
We hope you enjoy Mailper; let us know in the comments if you have any suggestions about the product