Name: X402 Tools MCP
Author: mizukaizen

Install

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

Passed 2/3 checks · Runs on your computer

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 Tools MCP 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 Tools MCP 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
Checking the commands · copy buttons appear once they pass
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 Tools MCP and tell me what you can do for me, then show me one thing
✓ If Claude says it is using X402 Tools MCP or shows a X402 Tools MCP 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 Tools MCP yet

X402 Tools MCP 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 Tools MCP

Steps for Claude →You need a X402 Tools MCP 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 Tools MCP key (create it on the maker’s site) · Install Node.js on your computer first (one time)
Steps for Cursor →You need a X402 Tools MCP 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 Tools MCP key (create it on the maker’s site) · Install Node.js on your computer first (one time)

B · Others in Other that work with ChatGPT

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

Hostinger✓ ChatGPT
World Monitor✓ ChatGPT
Svelte MCP✓ ChatGPT

Works with Claude Code, with some setup first

You need a X402 Tools MCP 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 Tools MCP 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
Paste this command and press Enter
Checking the commands · copy buttons appear once they pass
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 Tools MCP listed as connected
Done
Try it
Use X402 Tools MCP and tell me what you can do for me, then show me one thing
✓ If Claude Code says it is using X402 Tools MCP or shows a X402 Tools MCP 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 Tools MCP 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 Tools MCP 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
Checking the commands · copy buttons appear once they pass
Done
Fill in your key
In the X402 Tools MCP settings, X402_PAYMENT_HEADER, X402_INTERNAL_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 Tools MCP and tell me what you can do for me, then show me one thing
✓ If Cursor says it is using X402 Tools MCP or shows a X402 Tools MCP 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 Tools MCP 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 Tools MCP 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
Checking the commands · copy buttons appear once they pass
Done
Fill in your key
In the X402 Tools MCP settings, X402_PAYMENT_HEADER, X402_INTERNAL_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 Tools MCP and tell me what you can do for me, then show me one thing
✓ If VS Code says it is using X402 Tools MCP or shows a X402 Tools MCP 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 Tools MCP💬 Discussion →

For developers: Terminal commands and JSON settings

Installed on your computer

Claude Code

Checking the commands · copy buttons appear once they pass

Claude Desktop (claude_desktop_config.json)

Checking the commands · copy buttons appear once they pass

Cursor (~/.cursor/mcp.json)

Checking the commands · copy buttons appear once they pass

VS Code (mcp.json)

Checking the commands · copy buttons appear once they pass

Values you fill in

X402_PAYMENT_HEADER secret env
Signed x402 payment token from your wallet client. Set if handling payments manually.
X402_INTERNAL_KEY secret env
Bypass key for trusted internal callers — skips x402 payment flow entirely.

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

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 13, 2026

✓ Pass
Maker matches the repo
The registry name was verified with the GitHub account mizukaizen, which owns the repo
✓ Pass
Still maintained
Code last changed 5 months ago
✕ Fail
Has a licence
No licence file found in the repo
– 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.

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User reviews

No reviews yet

Sign in with Google to write a review

Compared with others in Otheri

More stars than 86% of the other 19487 servers in this category
Published to the registry more recently than 7% of the other 19487 servers in this category
Basic checks equal to or better than 44% of the other 19487 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 Tools MCP safe?

It passed 2 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: X402_PAYMENT_HEADER, X402_INTERNAL_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 5 months ago, and the latest version (0.1.4) reached the registry 6 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: World Monitor, Claude Flow, Windmill

Others in the same category

Servers in the same category from other makers, sorted by stars.

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

World Monitor

Real-time global intelligence on conflict, markets, energy, trade, shipping and cyber. 104 tools.

by koala73Widely used★ 90.5KUpdated yesterday

Runs in the cloud✓ service owner · worldmonitor.app

How to connect

Claude Flow

AI orchestration with hive-mind swarms, neural networks, and 87 MCP tools for enterprise dev.

by ruvnetWidely used↓ 13.5K/wk★ 81.5KUpdated 14 months ago

Runs on your computer

Install

Windmill

Run Windmill scripts and flows and manage jobs, schedules, resources and variables.

by windmill-labsWidely used★ 18.6KUpdated yesterday

Runs in the cloud

How to connect

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.

@melis-ai/x402-tools-mcp

Boring infrastructure for agent builders. 22 pay-per-call utility tools served as an MCP server — scrape, validate, embed, store, moderate, notify, convert, prevent loops. No accounts, no API keys, no subscriptions. Pay with USDC on Base via the x402 protocol.

npx @melis-ai/x402-tools-mcp

→ Full catalogue with prices and live examples: [agents.melis.ai](https://agents.melis.ai) → Canonical 5-step RAG pipeline: [agents.melis.ai/pipelines/rag](https://agents.melis.ai/pipelines/rag) → 5-minute getting started: [agents.melis.ai/docs/getting-started](https://agents.melis.ai/docs/getting-started)

Tool catalogue (22)

Tool	Price (USDC)	Description
`list_services`	free	Returns the full catalogue with prices and endpoint URLs
`cacheserve`	$0.001	Fetch a URL with server-side caching — avoids redundant origin hits
`docconvert_text`	$0.001	Format conversion: md↔html, json↔csv, html→txt, etc.
`intentflow`	$0.001	Context handoff relay for multi-agent delegation (async, returns retrieve_url)
`memoryserve_write`	$0.001	Store text + embedding in Qdrant + SQLite, namespaced per `agent_id`
`memoryserve_query`	$0.001	Recall most-similar memories by semantic query
`memscrub`	$0.001	Scan retrieved RAG content for indirect prompt injection (10 patterns)
`notifyrelay_webhook`	$0.001	POST a JSON payload to a URL with optional HMAC-SHA256 signing
`schemagate`	$0.001	Validate a JSON response against a JSON Schema, return a hint on failure
`loopwall_hop`	$0.0005	Validate one hop of a signed multi-agent chain (loop / budget enforcement)
`loopwall_issue`	$0.001	Issue a signed Job Envelope at chain start with budget + hop cap
`imageguard`	$0.002	NSFW image classification (multi-class moderation on roadmap)
`notifyrelay_telegram`	$0.002	Send a Telegram message to a known chat ID
`promptguard`	$0.002	Score untrusted input for prompt injection risk (0–100)
`structextract`	$0.002	Extract structured JSON from HTML — tables, links, emails, phones
`xaudit`	$0.002	Validate API response content with a cryptographically signed certificate
`docconvert_pdf`	$0.005	Convert HTML or markdown to PDF (base64 output)
`kyaoracle`	$0.005	On-chain trust score (0–100) for an Ethereum/Base wallet address
`linkrisk`	$0.005	URL risk profile — heuristic phishing signals, redirect tracing
`markdownopt`	$0.005	Convert URL or HTML to clean LLM-ready markdown (~70% token reduction)
`notifyrelay_email`	$0.005	Send a transactional email via Resend (allowlisted, rate-limited)
`embedpay`	$0.00005 / 1k tokens	OpenAI text-embedding-3-small wrapper, batch tier available
`linksafe`	$0.01	Definitive URL safety check via Playwright sandbox + VirusTotal
`scrapepay`	$0.01	Web extraction via Playwright (robots.txt enforced, SSRF-safe)
`pdf_render`	$0.49	High-fidelity URL or HTML → PDF via Playwright

22 services. Live prices and live wallet on Basescan.

Why x402, why pay-per-call

No signup tax. Every tool here works the moment your wallet has USDC. No accounts to provision, no API keys to rotate, no subscription tiers to forecast.
Charge-on-success-only. Every service settles payment only on HTTP 2xx with non-empty content. Failed calls cost nothing — your retry budget is preserved.
Composes naturally. ScrapePay → MarkdownOpt → EmbedPay → MemoryServe → MEMSCRUB is the canonical RAG pipeline. Each step's payment is independent and verifiable on-chain.
MCP-native. One install, all 22 tools appear in Claude Desktop, Cursor, Cline, Continue, Claude Code, or any MCP-aware agent runtime.
No vendor lock-in. x402 is a Linux Foundation protocol (April 2026) co-signed by Google, AWS, Stripe, Visa, Mastercard. Other providers will offer x402 services; your wallet client works with all of them.

Installation — Claude Desktop

Add to your claude_desktop_config.json:

"mcpServers": { "x402-tools": { "command": "npx", "args": ["@melis-ai/x402-tools-mcp"] } } }

macOS: ~/Library/Application Support/Claude/claude_desktop_config.json Windows: %APPDATA%\Claude\claude_desktop_config.json

Restart Claude Desktop. All 22 tools appear in the tool picker.

Installation — Cursor, Cline, Continue, Claude Code

See agents.melis.ai/docs/install-mcp for per-client setup.

Example: canonical RAG pipeline

// All 22 tools registered as MCP tools — your agent calls them like any function

// Later — recall and guard against indirect injection const hits = await callTool('memoryserve_query', { agent_id: 'agent-1', query: 'what did we learn about X?', }); for (const chunk of hits.matches) { const scrub = await callTool('memscrub', { content: chunk.content }); if (scrub.risk_level === 'safe') useChunk(chunk); }

Total cost per 5k-token page: ~$0.017 USDC. Detailed walkthrough: agents.melis.ai/pipelines/rag.

Funding the wallet

x402 settles in USDC on Base (Coinbase L2). Two paths:

Coinbase Wallet — buy USDC, switch to Base network, send to your agent's wallet.
Bridge from Ethereum mainnet — bridge.base.org.

$1.00 of USDC covers 100 ScrapePay calls, 200 PromptGuard calls, or one full RAG-pipeline ingestion run.

Discovery surfaces (for agent builders + AI consumers)

URL	Purpose
agents.melis.ai/llms.txt	Concise LLM-readable catalogue
agents.melis.ai/llms-full.txt	Full schemas + composition recipes
agents.melis.ai/openapi.json	OpenAPI 3.1 spec for all 22 endpoints
agents.melis.ai/ai-plugin.json	ChatGPT-plugin manifest
`https:// .melis.ai/.well-known/mcp.json`	Per-service MCP discovery
agents.melis.ai/agents-faq	Agent-builder FAQ (distinct from human FAQ)

Comparisons

Source & licensing

MCP wrapper source (this repo): MIT licensed.
Service code (the 22 services themselves): closed source for security.
Site content (agents.melis.ai docs): CC-BY-4.0 — attribute "melis x402 Tools" with a link to agents.melis.ai.

Security

Found a vulnerability? See SECURITY.md. Email mizukaizen@proton.me. Critical issues acknowledged within 24 hours.

Citing this work

If you use melis x402 Tools in research or downstream products, see CITATION.cff for the canonical citation.

Author

mizukaizen — agent operator and builder. Catalogue: agents.melis.ai · Email: mizukaizen@proton.me

X402 Tools MCP

What it does

Install

Install Node.js

Sign up and create a X402 Tools MCP 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 Tools MCP 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 Tools MCP 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 Tools MCP 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 Otheri

Common questions

Others in the same category

World Monitor

Claude Flow

Windmill

README from the maker

@melis-ai/x402-tools-mcp

Tool catalogue (22)

Why x402, why pay-per-call

Installation — Claude Desktop

Installation — Cursor, Cline, Continue, Claude Code

Example: canonical RAG pipeline

Funding the wallet

Discovery surfaces (for agent builders + AI consumers)

Comparisons

Source & licensing

Security

Citing this work

Author