It seems somewhat intuitive that Frames can be composable. 

You can build a frame that can take state data via a POST request and other frames can hook into. 

e.g. a Checkout frame that has an in-frame flow for getting user shipping data and processing a transaction and then sends the user back to the original frame

Cofounder @curated | Builder and Fine JPEG Collector | Mint a meme by casting frameme.xyz

Not sure if anyone's explored this, but personally digging in. Wondering if anyone's created any examples.

Sketch of a possible model for a frame-to-frame transaction flow, using browsing OpenSea listings and buying on Seaport as an example.

Dapps could provide a "Frame API" for checkouts and other types of transactions, served from their own domain. (I think @paulcowgill first explored this idea with /onceupon frames)

I posted one example here. I hope we see more of this!

I'm eth newbie..just learning
(working on @farcaster)

terminally.online

That is an excellent example. External frames could point to multiple marketplaces and perhaps even get transaction commissions for pointing

I posted one example here. I hope we see more of this!

https://warpcast.com/horsefacts.eth/0x2cd24ad1

me at @unofficial — building the company around this!