Yes, X402 Tools is free to use.

How do I install X402 Tools?

X402 Tools is a remote plugin. You do not need to install anything locally. Add the server URL to your AI app's MCP configuration and you are ready to go.

Is X402 Tools safe to use?

Yes. X402 Tools passed MCP Marketplace's automated security scan with a score of 10/10 (low risk). Every server on MCP Marketplace is security-scanned before it's listed; see the full security report on this page for the findings and permissions.

What AI apps work with X402 Tools?

X402 Tools uses the Model Context Protocol (MCP) and works with any MCP-compatible AI app, including Claude, ChatGPT / Codex, Gemini, Copilot, Cursor, and more.

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X402 Tools MCP Server

by Foxxx009

Developer ToolsLow Risk10.0MCP RegistryRemote

Free

Server data from the Official MCP Registry

Pay-per-call research tools for AI agents, paid via x402 USDC. Remote MCP, one free tool.

About

Pay-per-call research tools for AI agents, paid via x402 USDC. Remote MCP, one free tool.

Remote endpoints: streamable-http: https://fitze-x402-seller.app.workbuddy.host/mcp

Security Report

10.0

Low Risk10.0Low Risk

Valid MCP server (2 strong, 4 medium validity signals). No known CVEs in dependencies. Imported from the Official MCP Registry.

13 tools verified · Open access · No issues found

Security scores are indicators to help you make informed decisions, not guarantees. Always review permissions before connecting any MCP server.

Permissions Found in Source Code

Found by scanning the linked source code. This listing connects to a hosted endpoint, so none of this runs on your machine: it describes what the server software does where it is hosted.

HTTP Network Access

Connects to external APIs or services over the internet.

env_vars

Applies to the server that hosts this plugin, not to your machine.

Shell Command Execution

Runs commands on the server that hosts it, not on your machine.

How to Connect

Remote Plugin

No local installation needed. Your AI client connects to the remote endpoint directly.

Add this to your MCP configuration to connect:

{
  "mcpServers": {
    "io-github-foxxx009-x402-tools-mcp": {
      "url": "https://fitze-x402-seller.app.workbuddy.host/mcp"
    }
  }
}

Documentation

View on GitHub

From the project's GitHub README.

x402-tools-mcp

An MCP server that gives any AI agent six research and data tools, paid per call in USDC on Base through x402.

No API keys. No subscription. No monthly minimum. You pay a cent or two when your agent actually calls a tool.

Tool	Price	What it does
`web_fetch`	$0.01	Fetch a URL — status, final URL, title, cleaned text, top 20 links. For agents whose sandbox has no open-web access.
`domain_intel`	$0.02	RDAP registrar + creation/expiry dates, DNS records (A/MX/NS/TXT), Certificate Transparency history via crt.sh.
`github_repo`	$0.02	Repo facts: stars, forks, open issues, language, licence, last push, README excerpt.
`token_intel`	$0.02	ERC-20 facts read from Base mainnet: name, symbol, decimals, total supply, USDC balance.
`repo_diligence`	$2.50	Deep repo report — release cadence, contributor spread, issue/PR health, risk summary.
`web_brief`	$3.00	Multi-URL consolidated brief with per-source attribution.

Why this exists

Agent sandboxes are frequently firewalled from the open web, and the usual workaround — an API-key-gated scraping service — means a subscription, an account, and a monthly floor you pay whether or not you use it. x402 removes all three: the server answers 402 Payment Required, the client signs a USDC transfer authorisation, and the call proceeds. That is the whole handshake.

Setup

1. Fund a wallet. Any Base wallet with a few dollars of USDC. It needs no ETH — gas is paid by the settlement facilitator.

2. Export the key.

export X402_PRIVATE_KEY=0x<private key of that wallet>

3. Register the server with your MCP client:

{
  "mcpServers": {
    "x402-tools": {
      "command": "npx",
      "args": ["-y", "x402-tools-mcp"],
      "env": {
        "X402_PRIVATE_KEY": "0x..."
      }
    }
  }
}

Or run it locally:

git clone https://github.com/foxxx009/x402-tools-mcp
cd x402-tools-mcp && npm install
X402_PRIVATE_KEY=0x... node index.js

Environment variables

Variable	Required	Default
`X402_PRIVATE_KEY`	yes	—
`X402_BASE_URL`	no	`https://fitze-x402-seller.app.workbuddy.host`

X402_BASE_URL lets you point the same server at your own x402 seller.

What leaves your machine

Only two things: the tool arguments, and an EIP-3009 signature authorising a USDC transfer for the quoted amount. The private key never leaves the process. Signing is local; settlement happens on Base.

Notes

Payments are USDC on Base mainnet. A testnet wallet will not work.
Each call is charged on retry with X-PAYMENT; the 402 response always states the exact amount before you pay anything.
repo_diligence and web_brief are priced higher because they do real multi-request work. Call them deliberately.

Remote MCP (zero install)

Prefer not to run anything locally? The same service is exposed as a remote Streamable HTTP MCP endpoint:

https://fitze-x402-seller.app.workbuddy.host/mcp

Add it to any MCP client (Claude Desktop, Cursor, etc.) as a remote server URL. free_url_check runs without payment; paid tools answer HTTP 402 with x402 payment requirements and settle in USDC on Base when an x402-capable client retries. Listed in the official MCP Registry as io.github.foxxx009/x402-tools-mcp.

Licence

MIT

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