Cross-chainConcept
x402 Protocol
A ZK middleware spec for any paid endpoint.
x402 is a payment protocol — it answers who pays. zkRune adds the orthogonal answer to who is allowed. A reference middleware spec wraps any x402 endpoint with a zkRune verifier check, so payment and eligibility are enforced together at the HTTP layer.
Reference design in progress
Architecture coming this week
We are publishing one reference design per day. This page will be updated with a full architecture, code sketch, and a working ZK demo. If you are on the x402 Protocol team — or want to sponsor this design moving up the queue — get in touch.