You mention Lightning Labs and LND, but for completeness and to mention real production use cases:
Their L402 proxy, Aperture, has been used in front of their Loop and Pool services for years. The client for each of those managed the service-specific macaroons.
Didn't know they used it in loop but that makes sense as that also has its own client in litd
Ironically that's not even a web service 🤣
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Yeah it’s not built into any general web clients to my knowledge, so you need a custom client, but it has been used in production since 2020.
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