MCP X402

Name: MCP X402
Author: codespar

by codesparversion 0.1.5i★ –iRuns on your computer

Registry nameio.github.codespar/mcp-x402

Install

Overview

Description from the maker (original English)

DEPRECATED: no live endpoint (api.x402.org does not resolve)

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: X402_API_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: X402_API_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",
        "@codespar/mcp-x402"
      ],
      "env": {
        "X402_API_KEY": "your-value"
      }
    }
  }
}

Run this in your terminal

claude mcp add x402 --env X402_API_KEY=your-value -- npx -y @codespar/mcp-x402

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",
        "@codespar/mcp-x402"
      ],
      "env": {
        "X402_API_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",
        "@codespar/mcp-x402"
      ],
      "env": {
        "X402_API_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

X402_API_KEY secret required env
API key for x402

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 codespar, 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 32564 servers in this category
Published to the registry more recently than 50% of the other 32564 servers in this category
Basic checks equal to or better than 100% of the other 32564 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 MCP X402 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: X402_API_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 (0.1.5) reached the registry 40 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, Tools MCP

Alternatives

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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.

@codespar/mcp-x402

Deprecated: no live endpoint. Measured on 2026-09-27 against two public DNS resolvers (8.8.8.8 and 1.1.1.1): api.x402.org, the only host this server calls, does not resolve in DNS. x402 has no central API: it is an HTTP 402 protocol, and each seller picks the facilitator that verifies payment. No tool in this server reaches a service. The package is deprecated on npm and stays in this repository for reference only. If you have a working endpoint, point the server at it with X402_BASE_URL. To bring the package back, open an issue in mcp-dev-latam with the provider's documented base URL.

MCP server for x402 — HTTP-native micropayments protocol by Coinbase (USDC on Base/Solana)

What is x402?

x402 is an open protocol that enables machine-to-machine micropayments at the HTTP layer. When an AI agent requests a resource and receives HTTP 402 Payment Required, it automatically sends a USDC payment on-chain and retries — no checkout UI, no merchant integration, pure HTTP.

This is the payment rail purpose-built for agentic commerce.

Quick Start

Claude Desktop

Add to ~/.config/claude/claude_desktop_config.json:

"mcpServers": { "x402": { "command": "npx", "args": ["-y", "@codespar/mcp-x402"], "env": { "X402_API_KEY": "your-key", "X402_WALLET_ADDRESS": "your-wallet-address" } } } }

Claude Code

claude mcp add x402 -- npx @codespar/mcp-x402

Cursor / VS Code

Add to .cursor/mcp.json or .vscode/mcp.json:

"servers": { "x402": { "command": "npx", "args": ["-y", "@codespar/mcp-x402"], "env": { "X402_API_KEY": "your-key", "X402_WALLET_ADDRESS": "your-wallet-address" } } } }

Tools (10)

Tool	Purpose
`pay_request`	Pay for a 402-protected resource.
`verify_payment`	Verify if a x402 payment was received and settled on-chain
`create_paywall`	Create a x402 paywall configuration for an endpoint.
`get_paywall`	Get paywall configuration for a specific URL
`list_paywalls`	List all configured x402 paywalls
`delete_paywall`	Remove a x402 paywall from an endpoint
`get_balance`	Get available USDC balance for x402 payments
`list_payments`	List x402 payment history with optional filters
`get_payment`	Get details of a specific x402 payment
`get_supported_networks`	List supported blockchain networks, tokens, and facilitators for x402 payments

Authentication

x402 uses a Bearer API key from a registered facilitator.

Get your credentials

Visit the x402 documentation
Set up a facilitator or use Coinbase's hosted facilitator
Generate an API key
Get your wallet address (Base or Solana)
Set the environment variables

Environment Variables

Variable	Required	Description
`X402_API_KEY`	Yes	API key for x402 facilitator
`X402_WALLET_ADDRESS`	Yes	Wallet address for sending/receiving payments
`X402_NETWORK`	No	Blockchain network: `base` (default) or `solana`

Use Cases

Agent accessing premium APIs — AI agent pays per-request for data feeds, LLM APIs, or premium content
Micropayment monetization — Protect your API endpoints with sub-cent paywalls
Machine-to-machine commerce — Agents autonomously purchasing compute, data, or services

Roadmap

v0.2 (planned)

create_subscription — Set up recurring micropayments for an endpoint
estimate_cost — Estimate cost before paying for a resource
batch_pay — Pay for multiple resources in a single transaction

v0.3 (planned)

Multi-token support (ETH, SOL beyond USDC)
Streaming payments for long-running agent tasks

Want to contribute? Open a PR or request a tool.

Enterprise

Need governance, budget limits, and audit trails for agent payments? CodeSpar Enterprise adds policy engine, payment routing, and compliance templates on top of these MCP servers.

License

MIT

MCP X402

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

Tools MCP

README from the maker

@codespar/mcp-x402

What is x402?

Quick Start

Claude Desktop

Claude Code

Cursor / VS Code

Tools (10)

Authentication

Get your credentials

Environment Variables

Use Cases

Roadmap

v0.2 (planned)

v0.3 (planned)

Links

Enterprise

License