Cloaked Agent

Trustless spending accounts for AI agents on Solana

npm License: MIT

cloakedagent.com

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The Problem

AI agents need to spend money autonomously. But giving them wallet access is dangerous:

• Jailbroken agent? Drains your wallet
• Bug in agent code? Infinite spending loop
• Prompt injection? Attacker controls your funds

Agent-side limits don't work - the agent has the keys and can bypass its own rules.

The Solution

On-chain enforced constraints that agents literally cannot bypass.

┌─────────────────────────────────────────────────────────────────┐
│                      CLOAKED AGENT                              │
├─────────────────────────────────────────────────────────────────┤
│  Owner: Human wallet (full control)                             │
│  Delegate: AI agent key (can spend within limits)               │
│                                                                 │
│  Constraints (enforced by Solana program):                      │
│  ├── max_per_tx: 0.1 SOL                                        │
│  ├── daily_limit: 1 SOL                                         │
│  ├── total_limit: 10 SOL                                        │
│  ├── expires_at: 2026-02-15                                     │
│  └── token_limits:                                              │
│       └── USDC: 5/tx, 50/day, 500 total                        │
│                                                                 │
│  Even if jailbroken, agent CANNOT exceed these limits.          │
└─────────────────────────────────────────────────────────────────┘

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Privacy Architecture

Cloaked offers dual-mode privacy:

Standard Mode

• Owner wallet linked to agent on-chain
• Simple setup, lower fees

Private Mode (ZK)

• Zero-knowledge proofs hide wallet-agent link
• Owner proves ownership without revealing identity
• Funded anonymously via Privacy Cash

┌─────────────────────────────────────────────────────────────────┐
│                    PRIVACY STACK                                │
├─────────────────────────────────────────────────────────────────┤
│  ZK Circuits:      Noir (Aztec)                                 │
│  Client Prover:    Barretenberg (UltraHonk via WASM)            │
│  On-chain Verify:  Sunspot (Groth16 on Solana)                  │
│  Hash Function:    Poseidon (ZK-friendly)                       │
│  Anonymous Funding: Privacy Cash (privacycash.org)              │
└─────────────────────────────────────────────────────────────────┘

Private Agent Creation:
  Wallet signs message → Master secret derived → Commitment generated
  On-chain: owner_commitment (hash), NOT wallet address
  To manage: Prove knowledge of preimage via ZK proof

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Technology Stack

Component	Technology
Blockchain	Solana
RPC	Helius
Smart Contract	Anchor Framework
ZK Proofs	Noir + Barretenberg + Sunspot
Frontend	Next.js 16, React 19, TypeScript
Backend	Express.js (Relayer)
AI Integration	MCP (Model Context Protocol)
Token Support	USDC
x402 Payments	Native support

Program IDs (Devnet)

Cloaked Program: 3yMjzAeXXc5FZRUrJ1YqP4YMPhPd5bBxHQ6npNSPCUwB
ZK Verifier:     G1fDdFA16d199sf6b8zFhRK1NPZiuhuQCwWWVmGBUG3F

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Key Features

1. On-Chain Constraints

• Per-transaction limits
• Daily spending caps
• Lifetime limits
• Expiration dates
• Instant freeze

2. Privacy Options

• Standard mode (simple)
• Private mode (ZK proofs)
• Anonymous funding (Privacy Cash)

3. x402 Protocol Support

• Automatic payment handling
• Pay-per-use APIs
• AI service payments

4. Multi-Agent Dashboard

• Create/manage multiple agents
• Real-time spending visibility
• One-click freeze

5. USDC Token Support

• USDC with per-token spending constraints
• Same on-chain enforcement as SOL
• Token balance visibility in dashboard

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Quick Start

For AI Agents (MCP)

{
  "mcpServers": {
    "cloaked": {
      "command": "npx",
      "args": ["cloaked-mcp"],
      "env": {
        "CLOAKED_AGENT_KEY": "your-agent-key-here"
      }
    }
  }
}

The agent can pay in SOL or USDC - pass token: "USDC" to cloak_pay.

For Developers (SDK)

npm install @cloakedagent/sdk

import { CloakedAgent } from "@cloakedagent/sdk";

// Load agent (can spend)
const agent = new CloakedAgent(agentKey, rpcUrl);

// Spend within limits
await agent.spend({
  destination: recipientPubkey,
  amount: 100_000_000  // 0.1 SOL
});

// Spend USDC (requires token enabled on agent)
await agent.spendToken({
  destination: recipientPubkey,
  mint: USDC_MINT,
  amount: 5_000_000  // 5 USDC (6 decimals)
});

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Project Structure

cloaked/
├── programs/cloaked/     # Anchor program (constraints, ZK verification)
├── circuits/             # Noir ZK circuits (ownership proofs)
├── app/                  # Next.js frontend (dashboard, docs)
├── backend/              # Express relayer (fee payer, ZK ops)
└── sdk/                  # TypeScript SDK (@cloakedagent/sdk)
    └── src/mcp/          # MCP server (cloaked-mcp binary)

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Documentation

Full documentation available at cloakedagent.com/docs

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Why Cloaked?

Problem	Cloaked Solution
AI can drain wallet	On-chain limits can't be bypassed
No spending visibility	Real-time dashboard
Can't stop runaway agent	Instant freeze
Wallet identity exposed	Private mode with ZK proofs
Complex integrations	Native x402 support

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Cloaked - Trustless spending accounts for AI agents