This Godot 4 addon simplifies the deployment and hosting of multiplayer games. It includes scripts for bootstrapping multiplayer games and an editor plugin that facilitates deployment into the Jam Launch cloud.
Most features require a Jam Launch account. You can sign up for an account here.
There is an example project that uses this addon here.
With a regular Jam Launch account, you can play a deployed version of the example project here.
Jam Launch credits can be purchased and used to host your project on Jam Launch infrastructure. You only pay for the resources you use, and deployments can be done in one click from the addon's editor plugin:
If you don't have an account, you can still run games in local hosting mode with the addon. This allows you to verify game functionality and compatibility with Jam Launch.