ZAP1 + x402: privacy-preserving proof of paid access, anchored to Zcash

ZAP1 + x402: privacy-preserving proof of paid access, anchored to Zcash why this matters x402 is a draft HTTP standard for pay-per-request monetization. A service returns a 402 Payment Required response that tells the caller how to pay, the caller pays via some rail, and the service lets the request through. In an agent economy, this is interesting for micropayments, pay-per-inference APIs, and machine-to-machine flows. But the naive implementation has a problem: every x402 payment trail leaks i