Privacy x402

Zero-Knowledge Privacy for x402 Solana Payments

VIEW ON GITHUB
1 second
PAYMENT TIME
~1%
PROTOCOL FEE
4
AUDITS
100%
PRIVATE
const processor = createPrivacyProcessor({
  rpcUrl: process.env.SOLANA_RPC_URL,
  treasuryWallet: process.env.TREASURY,
  userPrivateKey: userKey
});

const result = await processor.processPayment(0.001);
console.log(result.depositSignature);
INSTALL
npm
npm install privacy-cash-402-sdk
yarn
yarn add privacy-cash-402-sdk
pnpm
pnpm add privacy-cash-402-sdk
PRIVACY FLOW
Deposit → Pool
Mix with Others
Generate ZK Proof
Withdraw → Treasury
UNLINKED

SDK for privacy-enhanced HTTP 402 payments on Solana. Payments are mixed through Privacy Cash before reaching your treasury, breaking all on-chain links between payer and recipient.

WHAT IS HTTP 402?

HTTP 402 "Payment Required" enables pay-per-request APIs. Users pay before accessing content or services. This SDK adds zero-knowledge privacy to 402 payment flows.

HOW IT WORKS

01

USER INITIATES PAYMENT

Client calls SDK to process 402 payment request

02

DEPOSIT TO PRIVACY CASH

SOL deposited into Privacy Cash pool, commitment created on-chain

03

ZERO-KNOWLEDGE PROOF

SDK generates Groth16 proof without revealing deposit identity

04

PRIVATE WITHDRAWAL

Treasury receives payment via ZK proof - link to user broken

TypeScript SDK
+
Privacy Cash Protocol
+
Groth16 ZK-SNARKs
=
PRIVATE 402 PAYMENTS
UNLINKABLE
Deposits and withdrawals cannot be connected on-chain
MIDDLEWARE
Drop-in Express middleware for 402 payments
AUDITED
Privacy Cash protocol audited by 4 firms