I did find some bins that have people hosting them publicly already, but due to the nature of this community they are probably going to advertise self-hosting as an option.
This last option isn't quite open source, it only has a bug tracker on Gitlab and an open API for plugin development:
https://www.pastery.net/
edit: formatting for clarity
I was browsing Radio Locator and clicked on the Other category where among reading services and exactly one electronic station was a cluster of shopping stations.
I did find some bins that have people hosting them publicly already, but due to the nature of this community they are probably going to advertise self-hosting as an option.
These bins below are more like Github Gist replacements:
This last option isn't quite open source, it only has a bug tracker on Gitlab and an open API for plugin development: https://www.pastery.net/ edit: formatting for clarity