This is a very useful proposal by @nagydani that should be getting more attention now that UX (and what I would call “developer UX”) is such a high priority in the community.
Simple Summary
A standard way of representing various transactions, especially payment requests in Ethers and ERC #20 tokens as URLs.
Abstract
URLs embedded in QR-codes, hyperlinks in web-pages, emails or chat messages provide for robust cross-application signaling between very loosely coupled applications. A standardized URL format for payment requests allows for instant invocation of the user’s preferred wallet application (even if it is a webapp or a swarm đapp), with the correct parameterization of the payment transaction only to be confirmed by the (authenticated) user.