Ethereum Foundation Launches zkAPI Privacy Tool on Mainnet

The launch matters less as a privacy feature than as a signal that zero-knowledge proofs are being applied to the payment layer of AI inference, where the link between payer and prompt is currently a default, not a choice. It affects AI providers and payment processors as much as end users, since neither side can now reconstruct that link. Whether the pattern extends beyond a single tool to broader AI billing stacks is the open question.