Storefront Guard

Name: Storefront Guard
Author: maxigirl123

by maxigirl123version 0.3.2i★ –iRuns on your computer

Registry nameio.github.maxigirl123/storefront-guard

Install

Overview

Description from the maker (original English)

Verifies a merchant storefront is legitimate before an AI agent commits payment.

PopNx MCP’s three pillars

These three are never merged into one score: opinions, measurements and popularity are different things.

User voiceiNo reviews yetReviews open together with accounts in a later step
Our basic checksi1 of 1 passedChecked from public information; code not scanned yet
UsageiNot measured yet★ –

What you can do with it

We have not written a plain-language summary for this one yet. Below are the facts we read from the registry.

Connection: Runs on your computer
Transport: stdio
Category: Online shops & payments
You need to fill in: GOOGLE_SAFE_BROWSING_API_KEY, SAM_GOV_API_KEY, URLHAUS_AUTH_KEY

Install

Pick the AI app you use, then copy the settings.

Before you install

Basic checks: 1 of 1 passed
Runs on your computer with your user’s permissions (files, network, apps).
You fill in yourself: GOOGLE_SAFE_BROWSING_API_KEY, SAM_GOV_API_KEY, URLHAUS_AUTH_KEY

Values marked secret are keys to your account. Never share them or paste them into a chat.

You need

npmNode.js installed (for the npx command)

Which app do you use?

ClaudeClaude CodeCursorVS CodeChatGPT

Pick your app above. We remember it, so next time the button says “Install in …”.

Open Claude Desktop → Settings → Developer → Edit Config, and paste this into claude_desktop_config.json

{
  "mcpServers": {
    "storefront-guard": {
      "command": "npx",
      "args": [
        "-y",
        "storefront-guard-mcp-server"
      ],
      "env": {
        "GOOGLE_SAFE_BROWSING_API_KEY": "your-value",
        "SAM_GOV_API_KEY": "your-value",
        "URLHAUS_AUTH_KEY": "your-value"
      }
    }
  }
}

Run this in your terminal

claude mcp add storefront-guard --env GOOGLE_SAFE_BROWSING_API_KEY=your-value --env SAM_GOV_API_KEY=your-value --env URLHAUS_AUTH_KEY=your-value -- npx -y storefront-guard-mcp-server

Fill in the empty values before running it.

Open in Cursor

Or copy the settings yourself

Paste into .cursor/mcp.json in your project, or ~/.cursor/mcp.json

{
  "mcpServers": {
    "storefront-guard": {
      "command": "npx",
      "args": [
        "-y",
        "storefront-guard-mcp-server"
      ],
      "env": {
        "GOOGLE_SAFE_BROWSING_API_KEY": "your-value",
        "SAM_GOV_API_KEY": "your-value",
        "URLHAUS_AUTH_KEY": "your-value"
      }
    }
  }
}

Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.

Open in VS Code

Or copy the settings yourself

Paste into .vscode/mcp.json in your project

{
  "servers": {
    "storefront-guard": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "storefront-guard-mcp-server"
      ],
      "env": {
        "GOOGLE_SAFE_BROWSING_API_KEY": "your-value",
        "SAM_GOV_API_KEY": "your-value",
        "URLHAUS_AUTH_KEY": "your-value"
      }
    }
  }
}

Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.

This one runs on your computer, and ChatGPT can only connect to servers on the internet. Pick another app.

Your choice stays on this device in a cookie; no account needed.

Values you fill in

GOOGLE_SAFE_BROWSING_API_KEY secret env
Google Safe Browsing API key for scam domain checks. Optional — degrades gracefully if not set.
SAM_GOV_API_KEY secret env
SAM.gov API key for US federal exclusions check. Optional — skipped if not set.
URLHAUS_AUTH_KEY secret env
URLhaus Auth-Key for malware URL lookups. Optional — degrades gracefully if not set.

These settings are generated from the maker’s registry entry. If the README says otherwise, follow the README.

What it can do

Runs on your computer; the tool list appears in your AI app after you install it.

Basic checksi

We check information anyone can see; we have not read the code. Checks that do not apply are left out of the count. · Checked Nov 7, 2026

✓ Pass
Maker matches the repo
The registry name was verified with the GitHub account maxigirl123, which owns the repo
… Not checked yet
Still maintained
We have not read this repo from GitHub yet
… Not checked yet
Has a licence
We have not read this repo from GitHub yet
– Not applicable
Endpoint responds
This one runs on your computer; there is no internet endpoint
– Not applicable
Sign-in with OAuth
Runs on your computer and uses local settings instead
… Not checked yet
No hidden instructions in tool descriptions
Runs on your computer; we can only read tool lists from internet endpoints

Compared with others in Online shops & paymentsi

More stars than 0% of the other 1753 servers in this category
Published to the registry more recently than 34% of the other 1753 servers in this category
Basic checks equal to or better than 100% of the other 1753 servers in this category

Compared with every active server in this category in the registry. Stars count only when the publisher owns the repo.

Common questions

Is Storefront Guard safe?

It passed 1 of 1 applicable basic checks. We have not read the code. Before adding a key or token, see what access the server asks for and use a key with only the permissions you need.

What keys or codes does it need?

You need to fill in: GOOGLE_SAFE_BROWSING_API_KEY, SAM_GOV_API_KEY, URLHAUS_AUTH_KEY

Does it run on my computer or in the cloud?

It runs on your computer. Your AI app starts it when needed, and data does not pass through the maker’s servers (unless it calls an online service itself).

Is it still maintained?

The GitHub repo last changed –, and the latest version (0.3.2) reached the registry 2 months ago.

Which apps can use it?

Apps that support MCP, such as Claude Desktop, Claude Code, Cursor and VS Code. You also need Node.js on your computer.

What can I use instead?

In the same category: Spree Commerce: open-source B2B and marketplace ecommerce, Stripe MCP, MCP Cn Commerce

Alternatives

Servers in the same category from other makers, sorted by stars.

Reading a card:★ GitHub starsiThree pillars: reviews · checks · usageiUpdated = latest version published to the registryi

Spree Commerce: open-source B2B and marketplace ecommerce

by spree

Open-source B2B and marketplace ecommerce; new stores include an MCP server for AI agents.

Runs in the cloud★ 15,812BSD-3-ClauseUpdated 8 days ago

Install

Stripe MCP

by stripe

Stripe’s official server lets AI view and manage customers, products, payments and invoices. Connect to Stripe’s cloud and sign in with OAuth.

Runs in the cloud★ 2,043MITUpdated 12 months ago

Install

MCP Cn Commerce

by TonyWang-hub

8 read-only MCP platform entries; support is operation-specific; merchant live acceptance pending

Runs on your computer★ 96MITUpdated 28 days ago

Install

README from the maker

Open the README

Copied from the maker’s repo as written. PopNx MCP has not reviewed or endorsed it. HTML, images and scripts are removed. Links lead off this site.

Fortik

Real-time merchant verification for agentic commerce. A shopping agent calls verify_storefront with a domain before paying, and gets back a trust score with a plain-English verdict the agent can act on — in under two seconds.

Fortik is the trust check AI shopping agents run before checkout. It doesn't ask merchants to register in advance — it gathers evidence directly, in the moment, from independent public sources.

[fortik.io](https://fortik.io)

This is the mirror image of merchant-side agent-verification protocols like Visa's Trusted Agent Protocol: those let a *merchant* confirm an incoming *agent* is legitimate. Fortik lets the *agent* confirm the *merchant* is legitimate before committing payment.

What it checks

Domain registration age & recent changes — via free public RDAP lookups. A domain registered days ago, or one whose registration data changed in the last two weeks, is a red flag.
SSL certificate issuance history — via free public Certificate Transparency logs (crt.sh). A cert reissued very recently on an otherwise long-established domain can indicate a takeover or hosting change, even when the domain itself looks old and trustworthy.
HTTPS validity — does the site currently serve a valid cert at all.
Known-scam blocklist — URLhaus and Google Safe Browsing.
Corporate registration — US entity lookup via OpenCorporates.
Legal name verification — GLEIF entity registry cross-check.
Web traffic rank — Tranco top-1M ranking.
Federal exclusions — SAM.gov debarment check.
FDA enforcement — corroborating signal when other risks are present.

Every deduction from the trust score comes with a plain-English reason in the reasons array — this is deliberately an explainable heuristic, not a black-box model.

Setup

Requires Node.js 18+.

npm install

npm run build

Copy .env.example to .env and fill in your keys.

Running it

As a local MCP server (stdio):

npm start

As a remote MCP server (streamable HTTP) with x402 payment:

npm run start:http

POST http://localhost:3000/mcp

As a pay-per-call x402 HTTP API:

npm run start:x402

POST http://localhost:4021/verify { "domain": "example-shop.com" }

As a REST API (API key auth):

npm run start:rest

POST http://localhost:4022/verify { "domain": "example-shop.com" }

Header: X-API-KEY: your-key

All three servers at once:

npm run start:all

MCP: http://localhost:3000/mcp

x402: http://localhost:4021/verify

REST: http://localhost:4022/verify

Feedback endpoint

Submit outcome data after a transaction to help build training data for future ML scoring:

POST http://localhost:4022/feedback

Header: X-API-KEY: your-key Body: { "domain": "example-shop.com", "outcome": "legit" | "scam" }

How to use the recommendation field

Every verification result includes a top-level recommendation string alongside the numeric trustScore. Agents should branch on it rather than implementing their own threshold logic against the raw score.

Value	Suggested agent behavior
`proceed`	Complete the transaction silently. Trust score is low-risk with high confidence.
`pause_for_confirmation`	Stop before paying and show `recommendationReason` to the user.
`do_not_proceed`	Block the transaction and actively notify the user — do not fail silently.

recommendationReason is a one-line plain-English explanation safe to show directly to users.

Pricing

$0.01/call via x402. Set your wallet address in PAY_TO_ADDRESS and network in X402_NETWORK (default: base).

Environment variables

Variable	Required	Description
`PAY_TO_ADDRESS`	Yes (x402)	Your wallet address for USDC payments
`X402_NETWORK`	No	Blockchain network (default: `base`)
`PRICE_USD`	No	Per-call price (default: `0.01`)
`API_KEYS`	Yes (REST)	Comma-separated valid API keys
`GOOGLE_SAFE_BROWSING_API_KEY`	No	Degrades gracefully if unset
`SAM_GOV_API_KEY`	No	Degrades gracefully if unset
`URLHAUS_AUTH_KEY`	No	Degrades gracefully if unset
`FEEDBACK_LOG`	No	Path for feedback JSONL log (default: `feedback.jsonl`)
`MCP_PORT`	No	MCP server port (default: `3000`)
`X402_PORT`	No	x402 server port (default: `4021`)
`REST_PORT`	No	REST API port (default: `4022`)

Storefront Guard

Overview

PopNx MCP’s three pillars

What you can do with it

Install

Before you install

Values you fill in

What it can do

Basic checksi

Maker matches the repo

Still maintained

Has a licence

Endpoint responds

Sign-in with OAuth

No hidden instructions in tool descriptions

Compared with others in Online shops & paymentsi

Common questions

Alternatives

Spree Commerce: open-source B2B and marketplace ecommerce

Stripe MCP

MCP Cn Commerce

README from the maker

Fortik

What it checks

Setup

Running it

POST http://localhost:3000/mcp

POST http://localhost:4021/verify { "domain": "example-shop.com" }

POST http://localhost:4022/verify { "domain": "example-shop.com" }

Header: X-API-KEY: your-key

MCP: http://localhost:3000/mcp

x402: http://localhost:4021/verify

REST: http://localhost:4022/verify

Feedback endpoint

How to use the recommendation field

Pricing

Environment variables