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Run402 MCP Server

answering

Run402 is answering right now. Last checked 4 min ago. 8 605 installs a week from npm. It exposes 2 tools. Last commit 2 Nov 2026.

x402 pay-per-call infra for agents: $0.03 image generation, Postgres, auth, storage, functions.

Installs per day peak 1 700 · avg 567 · -39% w/w
a month agotoday
Uptime history 91 days of history · worst day 99%
91 days agonow
100.0%
Uptime 24h
92 of 92 checks
2
Tools
read from the server
596 ms
Response time
average over 24h
8 605
Installs / week
npm and PyPI

What changed 3

Every tool that appeared, vanished or quietly changed what it asks for. Recorded since 11 October 2026. No other catalogue keeps this.

11 Oct 2 tools disappeared experiment_scoreboard, submit_wall_claim
11 Oct a tool changed version

What the code does

We read the source, 21 h ago · tools taken from the live server · rules 995398eba69f

A tool parameter reaches a dangerous call

A value the model can set ends up inside a file or shell call. That is not a flaw by itself — for a terminal server it is the job — but it is where things go wrong when it is not.

A tool parameter reaches a file or shell call x402_price_check.url → buzz/install-smoke.mjs:87
  const bytes = readFileSync(absolute);
Capabilities

What this server is able to do. For an MCP server this is often the job itself — a terminal server runs commands because that is what it is for. Listed so you know what you are plugging in, not as an accusation.

File ships in the package but is absent from the source [пакет] sdk/core-dist/config.js:1, [пакет] sdk/core-dist/control-plane-session.js:1, [пакет] sdk/core-dist/keystore.js:1 и ещё 7
этот файл ставится пользователю, но в репозитории его нет
Long encoded blob in source test-vectors/r402s-v0/vectors.json:833
    "signature_preimage_hex": "72343032732f76302f7661756c745f67656e657369730a7b22616c6c6f636174696f6e5f6e6f6e6365223a226662393664613264333265393235386332613037653636643161626639643532222c22637265617465645f6174223a22323032362d30382d32305431323a30303a30302e3030305a222c2263726561746…
import { existsSync, mkdirSync, readdirSync, readFileSync, renameSync, rmSync, statSync, unlinkSync, writeFileSync } from "node:fs";
Touches key and credential files cli/lib/repos.mjs:450
                    s3:// destination (read from ~/.aws/credentials at USE
In the project's build, not in the package

Found in continuous integration, deployment or infrastructure files, or in a neighbouring package of the same monorepo. None of this is installed when you add the server: it describes how the project is built and released. We list it because a leaked key in a build pipeline is still a real problem, but it is not something this server does on your machine.

Builds a file path from a variable .github/workflows/publish.yml:245
              return import(path.join(dir, f)).catch(function (e) { throw new Error(f + ': ' + e.message); });

Is this your server and something here is wrong? Tell us — corrections are free and do not require a plan.

A tool parameter here reaches a dangerous call

That is not a flaw by itself — but it is where things go wrong when it is not the job. We re-read this code on every release. Watch it and you hear from us the day another one appears.

Three servers free · no card

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 4 min ago.

run in your terminal
claude mcp add mcp --transport http https://mcp.run402.com/mcp
Settings → Connectors → Add custom connector, then paste this address
https://mcp.run402.com/mcp
~/.codex/config.toml
[mcp_servers.mcp]
url = "https://mcp.run402.com/mcp"
.cursor/mcp.json
{
  "mcpServers": {
    "mcp": {
      "url": "https://mcp.run402.com/mcp"
    }
  }
}
.vscode/mcp.json
{
  "servers": {
    "mcp": {
      "type": "http",
      "url": "https://mcp.run402.com/mcp"
    }
  }
}

Available tools 2

Read directly from the server with tools/list, grouped by what they act on. If a tool disappears, we record the date.

run402
run402_quickstart
How an agent gets a Postgres database, static site, serverless functions, storage and email on run402 with no signup — paid per-use with x402 USDC on Base. Returns the 60-second start, key URLs, and the free-testnet path.
x402
x402_price_check
Inspect any https URL for x402 pricing: performs an unpaid request and decodes the 402 challenge (price, network, asset, recipient). Free — no payment is made.

Tools removed

Tools this server used to expose. Anything built against them stopped working on the day they went.

experiment_scoreboard
removed 11 Oct 2026
submit_wall_claim
removed 11 Oct 2026

Endpoints

URLTransportStateLatencyChecked
https://mcp.run402.com/mcp streamable-http answering 615 ms 4 min ago

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Run402 — questions

Answers built from our own checks of this server.

What can Run402 do?
It exposes 2 tools, read directly from the server on our last check. Among them: run402_quickstart, x402_price_check. The full list with descriptions is on this page — we take it from the server itself via tools/list, not from a README. How MCP servers expose tools in the first place →
Is Run402 working right now?
We send a real MCP handshake every 15 minutes. Over the last 24 hours 92 of 92 checks got a reply (100.0%), average response time 596 ms. The bar chart above shows every period we have measured.
Did Run402 ever remove tools?
Yes. experiment_scoreboard, submit_wall_claim are no longer exposed — we recorded the date each one disappeared. A tool vanishing usually means a breaking change for anything that depended on it.
How do I connect Run402?
Copy the ready config from this page. We generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each in the form that client actually reads. It is a remote server, so there is nothing to install — the client connects to the address.
Does Run402 need an API key?
No. Run402 completed a full MCP handshake with us as an anonymous client and listed its tools without asking for anything. All 2 of them are readable on this page. This is what we observed, not what the docs claim.
How fast is Run402?
It answers our handshake in 596 ms on average, which is faster than 19% of all working MCP servers we measure. That is on the slow side — worth knowing if the tool sits inside an interactive loop. The comparison comes from our own checks across the whole registry, every 15 minutes.
How many people use Run402?
The npm package run402-mcp was installed 8 605 times in the last week. Week over week that is -39%. We show installs rather than GitHub stars on purpose: a star is a bookmark, an install is someone actually running it.
Is Run402 open source?
The code is open source: it is published under the MIT licence, written in TypeScript, 24 stars on GitHub and 50 open issues. The licence covers the code in the repository, not the hosted service at mcp.run402.com, which runs on its operator's own terms.