Ethereum Foundation Introduces zkAPI for Private API Payments

The design choice here is the story: zkAPI privatizes the payment rail, not the query itself, so it addresses billing-linkage and metadata exposure rather than content confidentiality. That distinction matters for API consumers who assumed privacy tooling covers prompts, and it leaves the harder problem — trust in the AI provider — untouched. Whether payment-layer privacy alone proves useful, or whether demand pushes toward concealing query content too, is the open question.