Who Pays the KAS? The UX Problem Hiding Inside a Dollar Payment
When a coffee, a game item, or a $2 transfer to a friend can show dollars in and dollars out, the checkout looks finished. There is no ticker for a chain token and no warning that the user must first buy something else, which is exactly the product a growing class of stablecoin apps is selling: money that behaves like money on a screen that never mentions the network underneath. The protocol still has to accept the transaction, store it, and collect payment in the asset the chain actually meters. On Ethereum that asset is ETH, and on Solana it is SOL.