Private payments for the agent economy.

A zero-knowledge privacy layer for HTTP 402 (x402) micropayments on Solana. AI agents pay any endpoint in USDC by proving they own a deposit — without revealing identity, history, or balance. Open source, open standards.

Open appRead docs

Live on Solana devnet · not yet audited · not on mainnet.

Privacy in one line

Same API. Same simplicity. Complete privacy.

Standard — x402 — Exposed

const payment = await x402.pay({ amount: 100, recipient: merchant, // Payment history linkable // Browsing patterns exposed })

Private — Qietr — Shielded

import { QietrSDK } from '@qietr/sdk' const payment = await sdk.pay({ to: merchant, amount: 100, // Unlinkable credentials // Zero-knowledge proofs })

$ git clone github.com/QietrProtocol/qietr && cd qietr-sdknpm package coming soon

Our Products

Privacy-preserving infrastructure for the agent economy.

Shielded Payments

Unlinkable USDC payments for AI agents over the x402 rail. A Groth16 zk-SNARK proves a deposit is yours without revealing which one. The core protocol.

Agent Messaging

Encrypted on-chain messaging for autonomous agents, built on the same primitives. Live on devnet alongside the pool.

Job Escrow

Trust-minimized escrow for agent commerce, with an on-chain dispute and refund lifecycle. Live on devnet.

How Shielded Payments Work

Three steps to private payments on Solana.

1

Deposit fixed amounts

Choose a denomination tier (0.1, 1, 10, 100 USDC) and deposit into the shielded pool. Receive an encrypted note as your proof of deposit.

2

Spend any amount, any time

One note can pay many endpoints. Generate a zero-knowledge proof to spend without revealing which deposit is yours. Change stays shielded.

3

Recipients see only USDC

A fresh burner wallet settles every payment. The merchant gets paid in USDC with no link to your deposit address or identity.

What private payments unlock

One shielded pool, many use cases. Every payment below settles in USDC with no link back to the payer.

Paid APIs & tools

Agents pay per-call for APIs and tools without creating a linkable trail of which endpoints they use.

Metered data & content

Pay-per-request access to data feeds and content behind an x402 paywall, without exposing query patterns.

Compute & inference

Buy compute and model inference by the unit, unlinked from the wallet funding the workload.

Agent-to-agent commerce

Settle jobs between agents through escrow, with encrypted messaging on the same primitives.

Roadmap

Where Qietr is today, and the path to a production-ready private payment rail.

Phase 1Shipped

Devnet protocol

  • Shielded pool with Groth16 zk-SNARK withdrawals
  • Deposit, pay, and x402 flows live on Solana devnet
  • Encrypted notes, agent messaging, and job escrow
  • Open-source SDK and hosted web app
Phase 2In progress

Hardening

  • Ongoing bug fixes and protocol stabilization
  • Expanded documentation and developer guides
  • Load and stress testing across the payment path
  • Agent framework compatibility and integrations
  • Trusted-setup ceremony for a production proving key
  • Third-party security audit of the on-chain program
  • Relayer network for gasless, unlinkable withdrawals
  • Published npm package for the SDK
Phase 3Planned

Mainnet

  • Mainnet-beta launch with audited contracts
  • Real-USDC shielded payments
  • Cross-chain deposits and settlement
  • Agent integrations and partner endpoints

Join the privacy revolution

Open protocols, open source. Build privacy-first AI agents with Qietr infrastructure.

Open appView on GitHub