Sphinx Chat (which uses the lightning network’s TLV field as a messaging rail) has supported this for a while now. Different use cases compared to Nostr in terms of protocol, but having payment as layer one of a chat protocol has some real killer applications.

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This is also what Podcasting 2.0 is doing with Boostagrams. Small payment attached to a message.

Yep! Built on the same protocol. Sphinx Chat was effectively the first podcasting 2.0 app.