Keychat's sending addresses are continuously updated as a mechanism to protect metadata privacy. This also means that Keychat cannot adopt subscription mode.

We are trying out the AI bot on Keychat , where you pay ecash sat per question.

“Lastly, Keychat addresses the issue of user payments and relay charges. Since each message is not linked to an ID, traditional payment models are not feasible. Initially, we thought of having relays issue one-time anonymous access tokens that users could purchase and use for anonymous pay-per-use. Later, we realized that using Bitcoin ecash as postage for messages would be a better solution.”

nostr:note1h895va2vdwscyl3r339pdwnvy83kdu0cl646dnal69ws2n2s6p2qx2gaaz