X402 Scan MCP

Name: X402 Scan MCP
Author: forgemeshlabs

by forgemeshlabsversion 0.1.9i★ –iRuns on your computer

Registry nameio.github.forgemeshlabs/x402-scan-mcp

Install

Overview

Description from the maker (original English)

x402 Endpoint Scanner — a free local health probe for x402 paid endpoints as an MCP server.

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
UsageiVery new↓ 315/wk · ★ –

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: Clinics & health

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).
The registry lists no key to fill in.

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": {
    "x402-scan": {
      "command": "npx",
      "args": [
        "-y",
        "@forgemeshlabs/x402-scan-mcp"
      ]
    }
  }
}

Run this in your terminal

claude mcp add x402-scan -- npx -y @forgemeshlabs/x402-scan-mcp

Open in Cursor

Or copy the settings yourself

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

{
  "mcpServers": {
    "x402-scan": {
      "command": "npx",
      "args": [
        "-y",
        "@forgemeshlabs/x402-scan-mcp"
      ]
    }
  }
}

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": {
    "x402-scan": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "@forgemeshlabs/x402-scan-mcp"
      ]
    }
  }
}

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.

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 8, 2026

✓ Pass
Maker matches the repo
The registry name was verified with the GitHub account forgemeshlabs, 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 Clinics & healthi

More stars than 0% of the other 1028 servers in this category
Published to the registry more recently than 78% of the other 1028 servers in this category
Basic checks equal to or better than 100% of the other 1028 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 X402 Scan MCP 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?

The registry does not list a required key, though some servers ask you to sign in on first use.

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 (0.1.9) reached the registry 6 days 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: Mirobody, FHIR MCP Server, Google Health MCP

Alternatives

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

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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.

x402-scan-mcp — the free x402 Endpoint Scanner

Is your paid endpoint actually payable by agents?

Shipping a 402 Payment Required response is not the same as shipping a *correct* one. A missing field in accepts[], a malformed Base64 envelope, or content that leaks for free when the payment gate is misconfigured all look fine in a browser and invisibly cost you every agent that would have paid.

x402-scan-mcp is the free, open-source x402 Endpoint Scanner — an MCP server that probes one or more x402 endpoints and reports whether an agent can actually discover, parse, and pay for them. The npm package is @forgemeshlabs/x402-scan-mcp.

No payment is ever sent. The scanner never supplies a PAYMENT-SIGNATURE, so it cannot authorize or settle a transaction — it only inspects the shape of the 402 challenge.

=== x402 Endpoint Scan: https://library.forgemesh.io/business-management ===

Reachable: true HTTP: 402 Method: GET (184ms) 402: true Envelope: header Valid: true MPP: true Grade: A Findings:

Valid x402 envelope is advertised over both the classic PAYMENT-REQUIRED header and MPP's WWW-Authenticate: Payment header — maximally discoverable across agent payment stacks.

What it checks

HTTP 402 status — does the route actually return 402 Payment Required, or does it 200/404/500 and go unnoticed by payment-aware agents?
`PAYMENT-REQUIRED` envelope — is the header present, Base64-decodable, valid JSON, with a numeric x402Version and a non-empty accepts[]? Falls back to checking the response body for an x402Version field on endpoints that put the envelope there instead.
Required payment fields — does every entry in accepts[] carry scheme, network, asset, payTo, and amount?
MPP dual-stack — is the endpoint also discoverable via the WWW-Authenticate: Payment header, the MPP discovery path some agent stacks use instead of the classic header?
Free-content leaks — does the route serve real content with a 200 when it should be gated behind 402?

Every result is graded A (valid envelope + MPP dual-stack), B (valid envelope, classic header only), C (402 but the envelope is missing or malformed), or F (not 402, unreachable, or serving paid content for free) — plus plain-English findings[] explaining what an agent sees and why it costs you traffic.

Install

Requires Node.js ≥ 20. Published on npm as @forgemeshlabs/x402-scan-mcp — no clone or build needed.

npm install -g @forgemeshlabs/x402-scan-mcp

Or skip the install entirely and run it with npx (recommended for MCP clients):

npx -y @forgemeshlabs/x402-scan-mcp

Claude Code

claude mcp add x402-scan -- npx -y @forgemeshlabs/x402-scan-mcp

Claude Desktop / Cursor / Windsurf (any MCP client)

"mcpServers": { "x402-scan": { "command": "npx", "args": ["-y", "@forgemeshlabs/x402-scan-mcp"] } } }

Development (from source)

Only needed if you're hacking on the scanner itself:

git clone https://github.com/forgemeshlabs/x402-scan-mcp

cd x402-scan-mcp npm install && npm run build claude mcp add x402-scan -- node /path/to/x402-scan-mcp/dist/index.js

Tools

Tool	What it does
`scan_endpoint`	Probe one x402 endpoint — HTTP status, envelope source/validity, `accepts[]` summary, MPP dual-stack, A-F grade, findings
`scan_batch`	Run `scan_endpoint` over up to 10 URLs, sequentially, plus a one-line summary like `7/10 healthy, 2 dead, 1 broken envelope`
`census_stats`	Live ForgeMesh catalog stats plus the static August 2026 x402 Bazaar health census headline numbers

Try it: *"Scan my x402 route for a valid 402 challenge"* · *"Batch-scan these 5 endpoints and tell me which ones are broken"* · *"What did the August 2026 x402 health census find?"*

CLI smoke test (from a source checkout)

npm run smoke -- https://your-endpoint.example.com

Beyond the free local scan

This MCP server is local-only and free: it never leaves your machine except to call the endpoint you point it at (and, for census_stats, ForgeMesh's own public stats endpoint). If you want more:

Hosted, paid, server-side scan — POST https://x402.forgemesh.io/x402-endpoint-scan, $0.05 via x402. Useful when you want the probe to originate from a different network than yours, or you're calling it from an agent that already pays x402 for other tools.
Browser tool — forgemesh.io/scan for a one-off scan with no MCP client or wallet needed.
$5 full report with fixes — a deeper audit with ready-to-paste fixes for every failing check, at forgemesh.io/scan.

The August 2026 x402 Bazaar health census

census_stats bundles the headline numbers from ForgeMesh's own sweep of the x402 Bazaar catalog: 1,225 sellers probed, 74% healthy, 206 dead, 40 serving paid content for free, and only 15% MPP dual-stack. Full writeup: forgemesh.io/blog/x402-bazaar-health-census-august-2026.

Security

This scanner makes outbound requests to URLs you give it, so it is built to resist SSRF abuse:

Scheme allow-list — only http/https; file:, ftp:, gopher:, data: etc. are rejected.
Port allow-list — only 80, 443, 8080, and 8443. Any other explicit port is refused before any DNS lookup or network call.
Local-hostname rejection — localhost, *.localhost, *.local, and *.internal are refused by name, before DNS resolution runs.
Private-target blocking — after DNS resolution, requests to loopback, private (RFC 1918), link-local, CGNAT, reserved, multicast, and the cloud metadata address (169.254.169.254) are refused. IPv6 loopback/ULA/link-local and IPv4-mapped forms are covered too. If a hostname resolves to *any* private address, the scan is refused.
Pinned-IP transport — the request dials the exact public IP that was validated, while TLS still verifies the original hostname. This closes the validate-then-connect DNS rebinding window.
No redirect following — a 3xx response is reported as-is (status + Location, if any); the scanner never chases it. This matches how a strict agent client behaves and keeps the request count predictable.
Bounded — at most 2 requests per scan_endpoint call (one GET, plus one POST retry only on 405), forgemesh-scan-mcp/0.1 UA, 8s timeout, 64KB body cap.
Tested hardening — npm test covers unsafe URL rejection, private IP ranges, port allow-listing, and endpoint-scan grading against a local fixture server.

Deployment: stdio (local, per-user) is the safe default. A public HTTP deployment is a network-egress tool and must add authentication, per-client rate limiting, request logging, and an egress policy before exposure.

License

MIT — free for everyone. If the scanner found a broken 402, the fix is usually a one-line envelope correction.

X402 Scan MCP

Overview

PopNx MCP’s three pillars

What you can do with it

Install

Before you install

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 Clinics & healthi

Common questions

Alternatives

Mirobody

FHIR MCP Server

Google Health MCP

README from the maker

x402-scan-mcp — the free x402 Endpoint Scanner

What it checks

Install

Claude Code

Claude Desktop / Cursor / Windsurf (any MCP client)

Development (from source)

Tools

CLI smoke test (from a source checkout)

Beyond the free local scan

The August 2026 x402 Bazaar health census

Security

License