StealthGuard 402

StealthGuard 402 🛡️ — Open-Source MCP Server for Web Scraping & Market Intelligence

This repository contains the complete open-source Model Context Protocol (MCP) server implementation of StealthGuard 402. It equips LLM agents (Claude Desktop, Cursor, Windsurf, LangChain) with tools for Cloudflare-bypassing web scraping, prompt injection firewall sanitization, Polymarket whale orderbook divergence, and cross-chain pre-trade agent gating.

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🛠️ MCP Tools Implemented

This MCP server provides the following tools via standard stdio and streamable HTTP transports:

Tool Name	Description	Key Parameters
stealth_scrape_and_sanitize	Bypasses Cloudflare Turnstile, Akamai, and anti-bot protection using Scrapling, extracts clean web content, and strips prompt injection traps before LLM context ingestion.	url (string, required), render_js (boolean, default: false), strict_mode (boolean, default: true)
polymarket_alpha_divergence	Scans live Polymarket prediction markets, calculates divergence between prediction odds and on-chain spot momentum, and tracks whale orderbook flow.	category (string, e.g. crypto, politics, ai), limit (int, default: 25)
pre_trade_agent_gate	Unified pre-trade security gate for autonomous agents: audits contract bytecode, verifies DEX LP depth on Base and Solana, and sanitizes project metadata.	token_or_service_address (string, required), chain (base or solana, default: base), strict_mode (boolean)

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🚀 Running from Source (Local Stdio Transport)

You can run this MCP server locally from source using Python and the Model Context Protocol SDK.

1. Installation

# Clone the open-source repository
git clone https://github.com/ak10082247-max/stealthguard-402.git
cd stealthguard-402

# Set up virtual environment
python -m venv .venv

# On Linux/macOS:
source .venv/bin/activate
# On Windows:
.\.venv\Scripts\activate

# Install dependencies
pip install -r requirements.txt

2. Configure with Claude Desktop

Add this server to your claude_desktop_config.json:

• macOS: ~/Library/Application Support/Claude/claude_desktop_config.json
• Windows: %APPDATA%\Claude\claude_desktop_config.json

{
  "mcpServers": {
    "stealthguard-402": {
      "command": "python",
      "args": [
        "-m",
        "src.mcp_server"
      ],
      "cwd": "/absolute/path/to/stealthguard-402"
    }
  }
}

Or run via uv:

{
  "mcpServers": {
    "stealthguard-402": {
      "command": "uv",
      "args": [
        "run",
        "--directory",
        "/absolute/path/to/stealthguard-402",
        "python",
        "-m",
        "src.mcp_server"
      ]
    }
  }
}

3. Configure with Cursor or Windsurf

Add to your workspace .cursor/mcp.json or Windsurf settings:

{
  "mcpServers": {
    "stealthguard-402": {
      "command": "python",
      "args": ["-m", "src.mcp_server"]
    }
  }
}

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🌐 Connecting to the Hosted Remote MCP Endpoint

For cloud deployments and remote agent integrations, StealthGuard is deployed 24/7 on high-availability infrastructure:

• Remote MCP URL: https://stealthguard-402.onrender.com/mcp
• Protocol: Model Context Protocol (Streamable HTTP / SSE JSON-RPC 2.0)
• Discovery Manifest: https://stealthguard-402.onrender.com/.well-known/mcp/server-card.json
• x402 Manifest: https://stealthguard-402.onrender.com/.well-known/x402.json

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🏛️ System Architecture

sequenceDiagram
    autonumber
    actor LLM as Claude / Agent / Cursor
    participant MCP as StealthGuard MCP Server
    participant Scrapling as Scrapling Anti-Bot Engine
    participant Firewall as CanaryGuard Heuristic Filter
    participant Target as Destination Web Page

    LLM->>MCP: tools/call ("stealth_scrape_and_sanitize", { url })
    MCP->>Scrapling: Fetch Destination (Bypass Cloudflare)
    Scrapling->>Target: HTTP Request with Dynamic Fingerprinting
    Target-->>Scrapling: HTML Payload
    Scrapling->>Firewall: Extract Text & Scan for Injections
    Firewall-->>MCP: Sanitized Text + Safety Receipt
    MCP-->>LLM: Safe Content Payload (Zero Prompt Leaks)

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📦 Developer Integrations & Autonomous Auto-Pay

StealthGuard supports 100% gasless automated settlement on Base Mainnet (eip155:8453) and Solana Mainnet (solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp). Zero native gas ($0 ETH / $0 SOL) is required from your agent wallet.

1. Autonomous Agent Auto-Pay Quickstart (TypeScript)

Wrap standard fetch with @x402/fetch to automatically detect HTTP 402, sign EIP-712 payment authorization, and unlock full unredacted scrape & intelligence feeds:

npm install @x402/fetch @x402/core @x402/evm viem

import { wrapFetchWithPayment } from "@x402/fetch";
import { x402Client } from "@x402/core/client";
import { ExactEvmScheme } from "@x402/evm/exact/client";
import { privateKeyToAccount } from "viem/accounts";

const account = privateKeyToAccount(process.env.AGENT_PRIVATE_KEY as `0x${string}`);
const client = new x402Client();
client.register("eip155:8453", new ExactEvmScheme(account));

const xFetch = wrapFetchWithPayment(fetch, client);
const res = await xFetch("https://stealthguard-402.onrender.com/v1/stealth_scrape_and_sanitize", {
  method: "POST",
  headers: { "Content-Type": "application/json" },
  body: JSON.stringify({ url: "https://example.com", strict_mode: true }),
});
const data = await res.json();
console.log("Full Sanitized Content:", data);

2. Autonomous Agent Auto-Pay Quickstart (Python)

AI agent frameworks (LangChain, CrewAI, AutoGen) can auto-settle the 402 challenge in Python:

pip install requests eth-account

import base64, json, secrets, time, requests
from eth_account import Account
from eth_account.messages import encode_typed_data

def paid_stealth_scrape(target_url: str, private_key: str):
    account = Account.from_key(private_key)
    endpoint = "https://stealthguard-402.onrender.com/v1/stealth_scrape_and_sanitize"
    payload = {"url": target_url, "strict_mode": True}

    # Step 1: Initial probe (triggers 402 with structured 50% teaser + challenge)
    res = requests.post(endpoint, json=payload)
    if res.status_code == 200:
        return res.json()

    # Step 2: Auto-sign EIP-712 transfer authorization (100% gasless on Base)
    raw_pr = res.headers.get("PAYMENT-REQUIRED") or res.headers.get("X-Payment-Required")
    pr_json = json.loads(base64.b64decode(raw_pr).decode("utf-8"))
    accepted = next(a for a in pr_json["accepts"] if "8453" in str(a.get("network", "")))

    now = int(time.time())
    nonce = secrets.token_bytes(32)
    types = {"TransferWithAuthorization": [
        {"name": "from", "type": "address"}, {"name": "to", "type": "address"},
        {"name": "value", "type": "uint256"}, {"name": "validAfter", "type": "uint256"},
        {"name": "validBefore", "type": "uint256"}, {"name": "nonce", "type": "bytes32"},
    ]}
    domain = {"name": "USD Coin", "version": "2", "chainId": 8453, "verifyingContract": accepted["asset"]}
    msg = {"from": account.address, "to": accepted["payTo"], "value": int(accepted["amount"]), "validAfter": 0, "validBefore": now + 300, "nonce": nonce}
    sig = account.sign_message(encode_typed_data(domain_data=domain, message_types=types, message_data=msg)).signature.hex()
    
    payment_b64 = base64.b64encode(json.dumps({
        "x402Version": 2, "resource": pr_json.get("resource"), "accepted": accepted,
        "payload": {"signature": "0x" + sig.lstrip("0x"), "authorization": {
            "from": account.address, "to": accepted["payTo"], "value": str(accepted["amount"]),
            "validAfter": "0", "validBefore": str(now + 300), "nonce": "0x" + nonce.hex()
        }}
    }).encode()).decode()

    # Step 3: Replay with PAYMENT-SIGNATURE
    paid_res = requests.post(endpoint, json=payload, headers={"PAYMENT-SIGNATURE": payment_b64})
    return paid_res.json()

3. Direct REST API (cURL)

# Returns 402 with structured 50% free preview + unlock instructions:
curl -X POST https://stealthguard-402.onrender.com/v1/stealth_scrape_and_sanitize \
  -H "Content-Type: application/json" \
  -d '{"url": "https://example.com", "strict_mode": true}'

# Polymarket whale orderflow
curl -X POST https://stealthguard-402.onrender.com/v1/polymarket-odds-pulse \
  -H "Content-Type: application/json" \
  -d '{"category": "crypto"}'

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💳 Optional Cloud Subscriptions (MCPize / Apify)

For teams seeking turnkey managed infrastructure with flat monthly credit card billing rather than self-hosting:

• MCPize Directory: Connect via mcpize.com/dashboard
• Apify Pay-Per-Event: Actor distribution on apify.com

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📄 License

This open-source project is licensed under the MIT License — see the LICENSE file for details.