How do I use Cerberus?

1. Click on "Install Server". 2. Wait a few minutes for the server to deploy. Once ready, it will show a "Started" state. 3. In the chat, type @ followed by the MCP server name and your instructions, e.g., "@Cerberus Verify sender identity, screen risk, then authorize this 250 USDC payment." That's it! The server will respond to your query, and you can continue using it as needed. Here is a step-by-step guide with screenshots.

Cerberus

by lz-123123

Overview Schema Related Servers Score Discussions

TypeScript

Hybrid

Cerberus: On-Chain Payment Firewall for AI Agents

Three gates. MCP risk control. On-chain policy enforcement.

Security middleware for AI agent payments — off-chain MCP soft controls + on-chain Policy hard floor.

Full project guide: docs/PROJECT_GUIDE.md
MetaMask + network setup (step-by-step): docs/PROJECT_GUIDE.md#10-complete-metamask-guide-connect-wallet--add-network

Architecture

Payment Request
      │
      ▼
┌─────────────────────────────────────┐
│  Layer 1: Identity Verification     │  MCP: @cerberus/mcp-identity
├─────────────────────────────────────┤
│  Layer 2: Risk & Safety Screening   │  MCP: @cerberus/mcp-payment-guard
├─────────────────────────────────────┤
│  Layer 3: Execution & Authorization │  MCP: @cerberus/mcp-execution
│           + Policy.validate (chain) │  + PaymentGateway.pay (wallet)
└─────────────────────────────────────┘
      │
      ▼
  Approved / Blocked + Audit Log + Events

Pitch: MCP lets the agent check smartly; on-chain Policy makes rules unbypassable; events are independently verifiable.

Related MCP server: ows-mcp-wallet

Quick Start (Simulated Demo)

npm install
npm run demo

Open http://localhost:3000 — badge ⚡ Simulated.

Five scenarios: Identity / Risk / On-chain Policy / Success / Amount Limit.

On-Chain Mode + MetaMask (Summary)

# Terminal 1 — keep running
npm run node

# Terminal 2
npm run deploy:local

# Terminal 3
npm run demo

Badge should show ⛓️ On-chain.
In MetaMask, add network Localhost 8545 (RPC http://127.0.0.1:8545, chainId 31337).
Import Hardhat Account #0 private key:
0xac0974bec39a17e36ba4a6b4d238ff944bacb478cbed5efcae784d7bf4f2ff80
Run scenario 4 · Successful Payment → Connect Wallet → Approve & Pay.

Full step-by-step guide: §10 in docs/PROJECT_GUIDE.md.

Base Sepolia: PRIVATE_KEY=0x... npm run deploy:base-sepolia (then switch MetaMask to chainId 84532).

Mode	Layer 3 Policy
⚡ Simulated	In-memory whitelist simulation
⛓️ On-chain	`viem` `readContract` → `Policy.validateWithReason`

MCP Servers

npm run mcp:identity
npm run mcp:guard
npm run mcp:execution

Project Structure

cerberus/
├── docs/PROJECT_GUIDE.md     # Full project guide + MetaMask tutorial
├── packages/core/            # Three-layer firewall + chain/viem
├── packages/mcp-identity/
├── packages/mcp-payment-guard/
├── packages/mcp-execution/
├── packages/contracts/       # Policy, PaymentGateway, AgentRegistry, MockUSDC
└── apps/demo/                # Next.js demo + wagmi

License

MIT

This server cannot be installed

license - permissive license

quality - not tested

maintenance

How are these scores calculated?

Maintenance

–Maintainers

–Response time

–Release cycle

–Releases (12mo)

Commit activity

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