nostr:npub1mhcr4j594hsrnen594d7700n2t03n8gdx83zhxzculk6sh9nhwlq7uc226 described an elegant solution to this: with cashu payment requests, the merchant itself specifies which mint the merchant is willing to accept.

At that point the wallet can do a swap between mints.

This actually makes accepting these things viable imo. If the merchant has a trust relation with a specific mint, and the ecash wallet has the ability to auto-swap, then it actually starts to make sense.

nostr:note1y8rx9ymusd39ufgrvy5hqg4vr78kncthny0rzd6t6qhqar9l9skqly92aj