Cloaked
Trustless spending accounts for AI agents on Solana
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. │
└─────────────────────────────────────────────────────────────────┘
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
Technology Stack
Program IDs (Devnet)
Cloaked Program: 3yMjzAeXXc5FZRUrJ1YqP4YMPhPd5bBxHQ6npNSPCUwB
ZK Verifier: G1fDdFA16d199sf6b8zFhRK1NPZiuhuQCwWWVmGBUG3F
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
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)
});
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)
Documentation
Full documentation available at cloakedagent.com/docs
Why Cloaked?
Cloaked - Trustless spending accounts for AI agents