Warpcast

The simplest version of making your channel membership more open will be through a frame.

1. Pin the frame as the top cast in your channel

2. A user who isn't a member can click on the frame

3. Frame calls relevant APIs — token-gating, spam filtering, etc. — and the immediately invites any qualifying user to the channel.

4. So while there won't be a formal "request to join channel" built-in to Warpcast, the design allows for any developer to build channel gating software on day 1. 

5. This can also be used in conjunction with other moderation software (since we will now allow up to 10 moderators per channel). Use one tool for membership gating and another content moderation (if that's what you want to do), and use the other 8 moderation slots for people heavily invested in your community.

Farcaster Devs

If you're a developer interested in getting early access to the membership APIs — add, remove, list members—please reply here!

They're currently offering early access APIs to developers.
You might want to consider applying through the cast below.

I jumped in without thinking it through and now I'm regretting it...

Unlike Moxie, this is aimed at all Warpcast users. There seem to be various challenges like hosting server costs and such.

Frame Creator, Dune Wizard Newbie, Web3 Newbie, Japanese,Summary of Frame /japane-cast-info

They're currently offering early access APIs to developers.
You might want to consider applying through the cast below.

I jumped in without thinking it through and now I'm regretting it...

Unlike Moxie, this is aimed at all Warpcast users. There seem to be various challenges like hosting server costs and such.

https://warpcast.com/dwr.eth/0x06060306