Imagine a protocol to publish commercial offers for any given fragment of content addressable by URI. It would describe the details of some product or service and a set of proposed terms. We could surf the web looking for relevant content and publishing related offers. Various repositories would subscribe or not.
A browser (extension or native) would optionally pull offers from selected repositories and have UI for the user to solicit/pull offers for any given piece of content styled to signal their existence, and to filter and sort them. To make it sustainable there needs to be revenue sharing with the content source(s).
Are there existing projects like this?
The same protocol could be used for independent commentary and other annotation.