Shiba's commands are now (partially) documented in a github wiki. You can also get the link by typing !help in chat.

• Commands available to all users.
  
  • Get Help
  • Last mined block and block notification
  • Currency conversion
  • Last time a user chatted
  • Query historic crashpoints
  • Show your love for other players
• Commands restricted to admins and moderators.
  
  • Set a customized lick message