X402 MCP Server

Name: X402 MCP Server
Author: Jannis-E

by Jannis-Eversion 1.0.5i★ 0iRuns on your computer

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

How to install

What it does

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

Connects Runs on your computer
Account or key Needs BASE_PRIVATE_KEY
Category Design, images & audio

Install

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

Passed 3/3 checks · Runs on your computer · ✓ Commands checked Nov 14, 2026

First: which AI do you use?

ClaudeWeb · app · phoneChatGPTWebClaude CodeTerminalCursorCode editorVS CodeCode editorOtherOther apps

Pick your app and the steps appear below.

Works with Claude, with some setup first

You need a X402 MCP Server key (create it on the maker’s site) · Install Node.js on your computer first (one time) · Only the Claude desktop app (Windows or Mac), not the web or phone

Install Node.js
One time only; it works for every server that needs Node.js
Open the Node.js download page ↗
Done
Sign up and create a X402 MCP Server key
Open the maker’s site, sign up and create an API key for the next step. Check the maker’s site for pricing and free plans.
How to get a key is in the maker’s README below
Done
Open the Claude desktop app’s settings file
SettingsDeveloperEdit Config
Done

Paste these settings and save the file

{
  "mcpServers": {
    "x402": {
      "command": "npx",
      "args": [
        "-y",
        "x402-mcp-server_by_milza"
      ],
      "env": {
        "BASE_PRIVATE_KEY": "your-value"
      }
    }
  }
}

Paste the key only into the app’s field, never into a chat or to anyone

Done

Quit Claude and open it again
Done
Try it
Use X402 MCP Server and tell me what you can do for me, then show me one thing
✓ If Claude says it is using X402 MCP Server or shows a X402 MCP Server tool in the answer, you are connected

Menu names checked against Anthropic’s help page on Nov 11, 2026 · your screen may differ slightly by app version

ChatGPT cannot connect X402 MCP Server yet

X402 MCP Server runs on your computer, but ChatGPT can only connect servers that run on the web

What you can do instead

A · Use an app that can connect X402 MCP Server

Steps for Claude →You need a X402 MCP Server key (create it on the maker’s site) · Install Node.js on your computer first (one time) · Only the Claude desktop app (Windows or Mac), not the web or phone
Steps for Claude Code →You need a X402 MCP Server key (create it on the maker’s site) · Install Node.js on your computer first (one time)
Steps for Cursor →You need a X402 MCP Server key (create it on the maker’s site) · Install Node.js on your computer first (one time)
Steps for VS Code →You need a X402 MCP Server key (create it on the maker’s site) · Install Node.js on your computer first (one time)

B · Others in Design, images & audio that work with ChatGPT

Picked from the most used in the same category, only ones that connect by address with no key

Pascal 3D Editor✓ ChatGPT
Semiotic✓ ChatGPT
TypeUI✓ ChatGPT

Works with Claude Code, with some setup first

You need a X402 MCP Server key (create it on the maker’s site) · Install Node.js on your computer first (one time)

Install Node.js
One time only; it works for every server that needs Node.js
Open the Node.js download page ↗
Done
Sign up and create a X402 MCP Server key
Open the maker’s site, sign up and create an API key for the next step. Check the maker’s site for pricing and free plans.
How to get a key is in the maker’s README below
Done
Open Terminal
Mac: press Command+Space and type Terminal · Windows: open PowerShell
Done
4
Paste this command and press Enter
```
claude mcp add --scope user x402 --env BASE_PRIVATE_KEY=your-value -- npx -y x402-mcp-server_by_milza
```
Replace “your-value” with your key before pressing Enter
Paste the key only into the app’s field, never into a chat or to anyone
Done
Type /mcp in Claude Code
You should see X402 MCP Server listed as connected
Done
Try it
Use X402 MCP Server and tell me what you can do for me, then show me one thing
✓ If Claude Code says it is using X402 MCP Server or shows a X402 MCP Server tool in the answer, you are connected

Menu names checked against Anthropic’s help page on Nov 11, 2026 · your screen may differ slightly by app version

Works with Cursor, with some setup first

You need a X402 MCP Server key (create it on the maker’s site) · Install Node.js on your computer first (one time)

Install Node.js
One time only; it works for every server that needs Node.js
Open the Node.js download page ↗
Done
Sign up and create a X402 MCP Server key
Open the maker’s site, sign up and create an API key for the next step. Check the maker’s site for pricing and free plans.
How to get a key is in the maker’s README below
Done
Click this button to open Cursor
Open in Cursor
Cursor asks you to confirm; click Install
Done
Fill in your key
In the X402 MCP Server settings, BASE_PRIVATE_KEY is empty; add your key and save
Paste the key only into the app’s field, never into a chat or to anyone
Done
Open the AI chat in Cursor in Agent mode
Done
Try it
Use X402 MCP Server and tell me what you can do for me, then show me one thing
✓ If Cursor says it is using X402 MCP Server or shows a X402 MCP Server tool in the answer, you are connected

Menu names checked against Cursor’s help page on Nov 11, 2026 · your screen may differ slightly by app version

Works with VS Code, with some setup first

You need a X402 MCP Server key (create it on the maker’s site) · Install Node.js on your computer first (one time)

Install Node.js
One time only; it works for every server that needs Node.js
Open the Node.js download page ↗
Done
Sign up and create a X402 MCP Server key
Open the maker’s site, sign up and create an API key for the next step. Check the maker’s site for pricing and free plans.
How to get a key is in the maker’s README below
Done
Click this button to open VS Code
Open in VS Code
VS Code asks you to confirm; click Install
Done
Fill in your key
In the X402 MCP Server settings, BASE_PRIVATE_KEY is empty; add your key and save
Paste the key only into the app’s field, never into a chat or to anyone
Done
Open the AI chat in VS Code in Agent mode
Done
Try it
Use X402 MCP Server and tell me what you can do for me, then show me one thing
✓ If VS Code says it is using X402 MCP Server or shows a X402 MCP Server tool in the answer, you are connected

Menu names checked against VS Code’s help page on Nov 11, 2026 · your screen may differ slightly by app version

Other apps that use MCP, such as Windsurf, Zed or Gemini CLI, each add servers differently. See how in the app list.

See every app that uses MCP →

JSON settings are under “For developers” below

Stuck? Ask people who use X402 MCP Server💬 Discussion →

For developers: Terminal commands and JSON settings

Installed on your computer

Claude Code

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

Claude Desktop (claude_desktop_config.json)

{
  "mcpServers": {
    "x402": {
      "command": "npx",
      "args": [
        "-y",
        "x402-mcp-server_by_milza"
      ],
      "env": {
        "BASE_PRIVATE_KEY": "your-value"
      }
    }
  }
}

Cursor (~/.cursor/mcp.json)

{
  "mcpServers": {
    "x402": {
      "command": "npx",
      "args": [
        "-y",
        "x402-mcp-server_by_milza"
      ],
      "env": {
        "BASE_PRIVATE_KEY": "your-value"
      }
    }
  }
}

VS Code (mcp.json)

{
  "servers": {
    "x402": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "x402-mcp-server_by_milza"
      ],
      "env": {
        "BASE_PRIVATE_KEY": "your-value"
      }
    }
  }
}

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.

Descriptions are as written by the maker.

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

At a glance

GitHub stars i: 0
Downloads per weeki: 68/wk
Licence i: MIT
Connection: Runs on your computer
Transport: stdio
Latest versioni: 1.0.5
Categoryi: Design, images & audio
Published to registryi: Sep 23, 2026
Code last changedi: Sep 24, 2026
Maker: Jannis-E
Packages: npm: x402-mcp-server_by_milza
Repo: Jannis-E/x402-mcp-server
Registry status: Active

Which apps can use it

Based on how this server connects and on each app’s own docs, checked Nov 10, 2026.

Run on your computer in

Claude Goose LM Studio Msty Studio Cherry Studio Cursor VS Code + GitHub Copilot Visual Studio Windsurf (Devin Desktop)Zed Kiro Cline Continue JetBrains AI Assistant Claude Code Codex CLI Gemini CLI OpenCode nodecode Warp LibreChat Raycast

All apps, with pros and cons →

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 14, 2026

✓ Pass
Maker matches the repo
The registry name was verified with the GitHub account Jannis-E, which owns the repo
✓ Pass
Still maintained
Code last changed 2 months ago
✓ Pass
Has a licence
Uses MIT
– 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

Discussion

Ask, share a tip or report that it does not work. Sorted by what people marked helpful.

No posts yet. Be the first to ask or share.

Posts here are written by users, not the PopNx team.

User reviews

No reviews yet

Compared with others in Design, images & audioi

More stars than 0% of the other 3063 servers in this category
Published to the registry more recently than 32% of the other 3063 servers in this category
Basic checks equal to or better than 100% of the other 3063 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 3 of 3 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 2 months ago, and the latest version (1.0.5) 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: Figma Context MCP, AutoClip, Next AI Draw.io

Others in the same category

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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-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

What it does

Install

Install Node.js

Sign up and create a X402 MCP Server key

Open the Claude desktop app’s settings file

Paste these settings and save the file

Quit Claude and open it again

Try it

What you can do instead

Install Node.js

Sign up and create a X402 MCP Server key

Open Terminal

Paste this command and press Enter

Type /mcp in Claude Code

Try it

Install Node.js

Sign up and create a X402 MCP Server key

Click this button to open Cursor

Fill in your key

Open the AI chat in Cursor in Agent mode

Try it

Install Node.js

Sign up and create a X402 MCP Server key

Click this button to open VS Code

Fill in your key

Open the AI chat in VS Code in Agent mode

Try it

Installed on your computer

Values you fill in

At a glance

Which apps can use it

Related guides

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

Discussion

User reviews

Compared with others in Design, images & audioi

Common questions

Others in the same category

Figma Context MCP

AutoClip

Next AI Draw.io

README from the maker

x402-mcp-server

Tools

Quickstart

How payment works

Security

Requirements

License

Links