This is a very rare sale on this service. Normally $49. I think the last sale of $1 was Black Friday of 2019 for a few hours.
Twitter announcement https://twitter.com/shodanhq/stat…93254?s=
Description from wikipedia for those who don’t know about this site
Shodan is a search engine that lets the user find specific types of computers (webcams, routers, servers, etc.) connected to the internet using a variety of filters. Some have also described it as a search engine of service banners, which are metadata that the server sends back to the client. This can be information about the server software, what options the service supports, a welcome message or anything else that the client can find out before interacting with the server.