I apologize, but it seems that the README file provided is empty and contains only a 404 error message. Therefore, I am unable to create a summary passage about the plugin.

If you could provide me with an actual README file containing details about the plugin, I would be happy to assist you in creating a short passage (100 words) about the plugin's features and benefits for users.

This plugin takes a stock symbol and returns a callout block with the latest stock information.