L402 Search MCP

Name: L402 Search MCP
Author: llmops-pro

by llmops-proversion 0.1.0i★ 0iRuns on your computer

Registry nameio.github.llmops-pro/l402-search-mcp

Install

Overview

Description from the maker (original English)

No-KYC web search for AI agents, paid per query in Lightning sats (L402). Holds no keys.

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 checksi2 of 2 passedChecked from public information; code not scanned yet
UsageiVery new↓ 55/wk · ★ 0

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: Search & AI memory

Install

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

Before you install

Basic checks: 2 of 2 passed
Runs on your computer with your user’s permissions (files, network, apps).
You fill in yourself: SEARCH_SERVICE_URL

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": {
    "l402-search": {
      "command": "npx",
      "args": [
        "-y",
        "l402-search-mcp"
      ],
      "env": {
        "SEARCH_SERVICE_URL": "your-value"
      }
    }
  }
}

Run this in your terminal

claude mcp add l402-search --env SEARCH_SERVICE_URL=your-value -- npx -y l402-search-mcp

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": {
    "l402-search": {
      "command": "npx",
      "args": [
        "-y",
        "l402-search-mcp"
      ],
      "env": {
        "SEARCH_SERVICE_URL": "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": {
    "l402-search": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "l402-search-mcp"
      ],
      "env": {
        "SEARCH_SERVICE_URL": "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

SEARCH_SERVICE_URL env
L402 search endpoint to consume (default: https://llmops-search.fly.dev)

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 11, 2026

✓ Pass
Maker matches the repo
The registry name was verified with the GitHub account llmops-pro, which owns the repo
✓ Pass
Still maintained
Code last changed 3 months ago
… 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 Search & AI memoryi

More stars than 0% of the other 5862 servers in this category
Published to the registry more recently than 17% of the other 5862 servers in this category
Basic checks equal to or better than 100% of the other 5862 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 L402 Search MCP safe?

It passed 2 of 2 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?

The registry does not list a required key, though some servers ask you to sign in on first use.

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 3 months ago, and the latest version (0.1.0) reached the registry 5 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: Ruflo, Context7, Metabase

Alternatives

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

Ruflo

Agent teams, swarms, memory and hooks for Claude Code and Codex, served over MCP.

by ruvnetWidely used↓ 74.3K/wk★ 81.4KUpdated today

Runs on your computer

Install

Context7

Feeds AI the latest docs for libraries and frameworks before it answers, so code it writes does not use outdated, removed functions.

by upstashWidely used↓ 1.2M/wk★ 64.4KUpdated yesterday

Computer or cloud

Install

Metabase

Lets AI clients search, explore, query, and visualize data in a Metabase instance.

by metabaseWidely used★ 50.3KUpdated 6 months ago

Runs in the cloud

Install

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.

l402-search-mcp

No-KYC web search for AI agents — paid per query in Lightning sats, via MCP.

This is an MCP *client-side* server for L402-paywalled search endpoints. It gives any MCP-capable agent (Claude Desktop, Claude Code, Cursor, nostr-merchant, …) a search tool that costs sats instead of an API key:

search(query) → returns a bolt11 Lightning invoice + payment_hash
The agent pays the invoice with its own wallet — e.g. nwc-mcp's nwc_pay_invoice, under the agent's own budget caps
search(query, payment_preimage) → JSON results

No account. No API key. No KYC. Each payment buys exactly one search.

By default it points at https://llmops-search.fly.dev (50 sats/search, run by us), but SEARCH_SERVICE_URL works with any endpoint speaking the same L402 dialect.

The trust model (read this)

This server holds NO keys. Not a wallet connection, not an nsec, nothing. Payment happens in the *agent's* wallet, where the agent's own budget caps, allowlists, and audit logs apply. l402-search-mcp only:

relays the L402 challenge (invoice) to the agent,
remembers which macaroon belongs to which payment_hash (so the agent only handles the preimage its wallet already returned),
makes the authorized retry.

Worst-case compromise of this process leaks pending search queries — never money.

Install

npx -y l402-search-mcp

Claude Code (project scope):

claude mcp add l402-search -s project -- npx -y l402-search-mcp

Claude Desktop (claude_desktop_config.json):

"mcpServers": { "l402-search": { "command": "npx", "args": ["-y", "l402-search-mcp"] } } }

Pair it with a wallet server (e.g. nwc-mcp) so the agent can actually pay.

Tools

Tool	Price	What it does
`search`	sats (set by the endpoint; 50 on the default)	First call returns the invoice; the call with `payment_preimage` returns results.
`search_service_info`	free	Endpoint reachability, pending challenges, flow explainer.

Configuration

Everything is optional — the defaults work. Set in the environment or a .env next to the install (never read from cwd):

SEARCH_SERVICE_URL=https://llmops-search.fly.dev  # any L402 search endpoint

CHALLENGE_TTL_SECONDS=900 # match the endpoint's macaroon TTL AUDIT_LOG_PATH=./l402-search-mcp-audit.log # NDJSON, append-only HTTP_TIMEOUT_MS=15000

The flow, end to end

agent                    l402-search-mcp              endpoint              agent's wallet

│ search("foo") │ │ │ │ ────────────────────────► │ GET /search?q=foo │ │ │ │ ───────────────────────► │ │ │ │ 402 {macaroon, invoice} │ │ │ {invoice, payment_hash} │ ◄─────────────────────── │ │ │ ◄──────────────────────── │ (macaroon cached) │ │ │ nwc_pay_invoice(invoice) │ │ │ │ ──────────────────────────┼──────────────────────────┼─────────────────────► │ │ {preimage} │ │ │ │ ◄─────────────────────────┼──────────────────────────┼────────────────────── │ │ search("foo", preimage) │ │ │ │ ────────────────────────► │ GET + Authorization: │ │ │ │ L402 macaroon:preimage │ │ │ │ ───────────────────────► │ │ │ {results} │ 200 {results} │ │ │ ◄──────────────────────── │ ◄─────────────────────── │ │

The macaroon never round-trips through the LLM — the agent only sees the invoice and hands back the preimage its wallet returned. sha256(preimage) = payment_hash recovers the rest.

Audit log

NDJSON, one line per event: startup, challenge_received, results_received, unknown_preimage, endpoint_error. Same shape as the other servers in the kit.

Part of the LLMOps.Pro agent-payments kit

nwc-mcp (wallet) · nostr-ops-mcp (NOSTR identity/publishing) · marketplace-mcp (storefront) · albyhub-admin-mcp (node admin) · paywall-mcp (sell YOUR tools for sats) · `l402-search-mcp` (buy search with sats)

MIT. Built by LLMOps.Pro · ⚡ sovereigncitizens@getalby.com

L402 Search MCP

Overview

PopNx MCP’s three pillars

What you can do with it

Install

Before you install

Values you fill in

Which apps can use it

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 Search & AI memoryi

Common questions

Alternatives

Ruflo

Context7

Metabase

README from the maker

l402-search-mcp

The trust model (read this)

Install

Tools

Configuration

The flow, end to end

Audit log

Part of the LLMOps.Pro agent-payments kit