A reference frames architecture:
- Serve your initial frame from a CDN on the domain you want to use for initialization, e.g. render.my.frame.***.xyz
- have post_url set to an endpoint that knows the context of the next frame
- have an image endpoint that renders dynamic images for your frames based on query data

Building a /farcaster and /base native MMORPG

- always post to the same endpoint, e.g. render.my.frame.***.xyz/api/action
- always add the origin_frame_id to the post_url of all frames
- have a map that gives you the next frame based on the origin_frame_id
- the action endpoint has the job of returning the next frame. You can hide all further logic behind that