X402 MCP Server

Name: X402 MCP Server
Author: Jannis-E

by Jannis-Eversion 1.0.5i★ –iRuns on your computer

Registry nameio.github.Jannis-E/x402-mcp-server

Install

Overview

Description from the maker (original English)

Pay-per-call x402 tools on Base: web extract/render, burn-once secret vault, chart, GeoTIFF

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: Other
You need to fill in: BASE_PRIVATE_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: BASE_PRIVATE_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": {
    "x402": {
      "command": "npx",
      "args": [
        "-y",
        "x402-mcp-server_by_milza"
      ],
      "env": {
        "BASE_PRIVATE_KEY": "your-value"
      }
    }
  }
}

Run this in your terminal

claude mcp add x402 --env BASE_PRIVATE_KEY=your-value -- npx -y x402-mcp-server_by_milza

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": {
    "x402": {
      "command": "npx",
      "args": [
        "-y",
        "x402-mcp-server_by_milza"
      ],
      "env": {
        "BASE_PRIVATE_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": {
    "x402": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "x402-mcp-server_by_milza"
      ],
      "env": {
        "BASE_PRIVATE_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

BASE_PRIVATE_KEY secret required env
0x-prefixed EVM private key, wallet funded with Base USDC -- signs EIP-3009 payments locally.

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 Jannis-E, 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 Otheri

More stars than 0% of the other 32589 servers in this category
Published to the registry more recently than 48% of the other 32589 servers in this category
Basic checks equal to or better than 100% of the other 32589 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 MCP Server 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: BASE_PRIVATE_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 (1.0.5) reached the registry 44 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: Spec Driven Development, Remote Desktop Commander, Detailing Manager

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Reading a card:★ 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-mcp-server

A small, growing catalog of x402-paywalled HTTP tools on Base Mainnet via x402 micro-payments — no API keys, no signup, pay per call in USDC.

This MCP server exposes that catalog as native MCP tools. Every tool call pays for itself automatically: the server POSTs the request, catches the real x402 v2 402 PAYMENT-REQUIRED challenge, signs an EIP-3009 TransferWithAuthorization with viem using a local wallet, and resubmits with the PAYMENT-SIGNATURE header. No human signature prompt at call time — the agent just calls the tool.

Tools

Tool	Cost (USDC)	Description	Key input parameters
`markdown-extractor`	0.01	Fetches a public URL and returns clean, token-efficient markdown, paywalled with the x402 v2 protocol on Base Mainnet. Designed for autonomous AI agents to call directly: no API key, no signup — pay per call in USDC.	`url` (string, required)
`spa-dom-to-md`	0.03	Renders JavaScript-heavy SPA pages in real headless Chromium via Cloudflare Browser Rendering, waits for network-idle / selector-ready, strips nav/footer/script chrome, and serializes the fully-rendered DOM into clean, LLM-ready Markdown.	`url` (string, required)
`burn-once-secret-vault`	0.01	Store a secret (API key, webhook payload, signed URL) encrypted with WebCrypto AES-256-GCM and share a claim URL that yields the secret exactly once. A Durable Object serializes reads so single-use delivery is race-free, and every burn returns an Ed25519-signed attestation. Creating a vault requires x402 payment; the recipient's claim read (GET /v/:vault_id) is free.	`secret` (string, required)
`svg-bar-chart-renderer`	0.015	Deterministic, paid-per-render SVG bar chart generator for LLM agents. Accepts labeled scalar data and layout options, performs exact geometry math (min/max normalization, nice-interval y-axis ticks, label spacing, bar-width distribution), and returns schema-valid, escape-correct SVG with identical input always yielding byte-identical output.	`data` (array, required)
`wasm-geotiff-transcoder`	0.03	Decodes a GeoTIFF/COG (https URL or inline base64), reads the selected RGB bands via windowed overview reads, applies a tone-map stretch, and returns a PNG/WebP plus georeference metadata (CRS, bounds, pixel scale) and source stats. Limits: 20 MB source, 2048 px output width. Billed per attempt: payment settles after structural validation, before decode, so decode-time failures (e.g. a bands_rgb band the source lacks) are still charged.	exactly one of `source` or `or_base64_body` (required)

All tools run on Base Mainnet (eip155:8453). Settlement happens server-side through an ordered facilitator chain — Coinbase CDP, then PayAI, then Primer as fallbacks — which changes nothing on your side: you sign the same EIP-3009 authorization either way, and every tool is also listed in the CDP and PayAI x402 Bazaar discovery catalogs. Exact request-body fields for each tool are also discoverable at runtime via /openapi.json.

Quickstart

Add this to your claude_desktop_config.json:

"mcpServers": { "x402-mcp-server": { "command": "npx", "args": ["-y", "x402-mcp-server_by_milza"], "env": { "BASE_PRIVATE_KEY": "0xyour_base_mainnet_private_key" } } } }

⚠️ Funding warning: BASE_PRIVATE_KEY must be a Base Mainnet wallet private key funded with a small amount of real USDC (e.g. $0.50 is enough for dozens of calls at these prices). Every tool call spends real money from this wallet. Do not use a key that holds funds you're not prepared to spend through this server, and never commit this key to source control.

Once configured, restart Claude Desktop and the tools listed above become available to the assistant automatically — no further setup, no dashboard, no API key registration.

How payment works

BASE_PRIVATE_KEY is your own wallet — whoever installs this server sets their own key and pays for their own calls. Each call settles straight to the tool provider's wallet; your key never touches anyone else's funds and no one else's key ever touches yours. To set it up:

Use (or create) a Base Mainnet EVM wallet you're OK spending small amounts from.
Fund it with a bit of USDC on Base (e.g. $0.50).
Export its private key and set it as BASE_PRIVATE_KEY in your MCP client config, as shown above.

Security

BASE_PRIVATE_KEY never leaves your machine. It is read once from the local environment and used only to sign EIP-712 typed-data (EIP-3009 TransferWithAuthorization) payment authorizations locally with viem.
No raw private key, seed phrase, or signature is ever sent over the network — only the resulting signed authorization, exactly as the x402 protocol requires to settle payment for the specific request being made.
Payment terms (recipient, amount, network, asset contract, expiry) are read fresh from each live 402 challenge returned by the resource server, never trusted from a local cache, so a stale or tampered local catalog can't redirect funds.
Spending ceiling: the live 402 challenge is trusted for signing mechanics (domain, nonce window, asset) but never for the amount. Every call checks the challenge's requested amount against this catalog's known price for that tool and refuses to sign anything higher — a hijacked, compromised, or buggy endpoint can't get a blank-check signature just by asking for more.
This package does not phone home, collect telemetry, or store your key anywhere on disk.

Requirements

Node.js 18+
A Base Mainnet EVM wallet, funded with a small amount of USDC, whose private key you control

License

MIT

X402 MCP Server

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 Otheri

Common questions

Alternatives

Spec Driven Development

Remote Desktop Commander

Detailing Manager

README from the maker

x402-mcp-server

Tools

Quickstart

How payment works

Security

Requirements

License

Links