JPYC zkPay

JPYC zkPay

A next-generation stablecoin payment solution in Japan that combines regulatory compliance, anonymity, and instant settlement.

Project description.

JPYC zkPay is a payment platform built under Japan’s new Electronic Payment Instruments framework. It drastically reduces payment fees for merchants and users while enabling privacy-preserving transactions fully compliant with AML/CFT regulations.

Traditional stablecoin payments expose transaction histories on the blockchain, making them traceable. JPYC zkPay solves this by combining zero-knowledge KYC (zk-KYC) with shielded pools, allowing only KYC-verified users to send anonymous payments.

By leveraging Japan’s My Number card and JPKI signature system, the platform ensures secure identity verification without revealing personal data.

Technologies used

• JPYC stablecoin

• Zero-Knowledge Proof-based KYC (zk-KYC)

• Shielded Pool (privacy layer)

• Ethereum-compatible blockchain and smart contracts

Basic architecture

• User: Performs KYC with My Number card and generates a zero-knowledge proof.

• zkPay Server: Verifies the proof and registers the user’s wallet address in an association set.

• Shielded Pool: Handles private (shielded) transfers so payments at the merchant side remain anonymous.

• Merchant: Receives stablecoins instantly through the zkPay wallet.

Source code

https://github.com/ou-junya/zkPay

Deployment

We’ve only deployed the frontend — nothing on the testnet, just running on a local node. If you want to interact with the contract, run a local node.

https://zk-pay.vercel.app/