Server data from the Official MCP Registry
Verifies a merchant storefront is legitimate before an AI agent commits payment.
About
Verifies a merchant storefront is legitimate before an AI agent commits payment.
Security Report
Valid MCP server (1 strong, 1 medium validity signals). 3 known CVEs in dependencies (0 critical, 1 high severity) Package registry verified. Imported from the Official MCP Registry.
11 files analyzed · 4 issues found
Security scores are indicators to help you make informed decisions, not guarantees. Always review permissions before connecting any MCP server.
Permissions Required
This plugin requests these system permissions. Most are normal for its category.
What You'll Need
Set these up before or after installing:
Environment variable: GOOGLE_SAFE_BROWSING_API_KEY
Environment variable: SAM_GOV_API_KEY
Environment variable: URLHAUS_AUTH_KEY
How to Install
Add this to your MCP configuration file:
{
"mcpServers": {
"io-github-maxigirl123-storefront-guard": {
"env": {
"SAM_GOV_API_KEY": "your-sam-gov-api-key-here",
"URLHAUS_AUTH_KEY": "your-urlhaus-auth-key-here",
"GOOGLE_SAFE_BROWSING_API_KEY": "your-google-safe-browsing-api-key-here"
},
"args": [
"-y",
"storefront-guard-mcp-server"
],
"command": "npx"
}
}
}Documentation
View on GitHubFrom the project's GitHub README.
storefront-guard-mcp-server
Agent-side merchant verification. A shopping agent calls verify_storefront
with a domain before paying, and gets back a trust score built from
free public data sources.
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. This tool 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) |
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