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Run402 MCP Server

answering

Run402 is answering right now. Last checked 3 min ago. 3 775 installs a week from npm. It exposes 4 tools. Last commit 17 Sep 2026.

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

Installs per day peak 1 089 · avg 364 · +127% w/w
a month agotoday
Uptime history 47 days of history
47 days agonow
100.0%
Uptime 24h
92 of 92 checks
4
Tools
read from the server
630 ms
Response time
average over 24h
3 775
Installs / week
npm and PyPI

What the code does

We read the source, 18 h ago · tools taken from the live server · rules 3dff92dd89df

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/allowance-auth.js:1, [пакет] sdk/core-dist/allowance.js:1, [пакет] sdk/core-dist/config.js:1 и ещё 8
этот файл ставится пользователю, но в репозитории его нет
import { mkdtempSync, readdirSync, readFileSync, rmSync } from "node:fs";
Long encoded blob in source test-vectors/r402s-v0/vectors.json:833
    "signature_preimage_hex": "72343032732f76302f7661756c745f67656e657369730a7b22616c6c6f636174696f6e5f6e6f6e6365223a226662393664613264333265393235386332613037653636643161626639643532222c22637265617465645f6174223a22323032362d30382d32305431323a30303a30302e3030305a222c2263726561746…
Touches key and credential files cli/lib/repos.mjs:437
                    s3:// destination (read from ~/.aws/credentials at USE

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 3 min ago.

run in your terminal
claude mcp add mcp --transport http https://mcp.run402.com/mcp
~/Library/Application Support/Claude/claude_desktop_config.json
{
  "mcpServers": {
    "mcp": {
      "url": "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
{
  "mcpServers": {
    "mcp": {
      "url": "https://mcp.run402.com/mcp"
    }
  }
}

This one needs environment variables set before it will start: RUN402_WALLET (Named wallet profile to use (optional; defaults to 'default'). Credentials are created on first run — no pre-existing account needed.), RUN402_MCP_PROFILE (Set to 'buyer' to register only the 6 tools a buy-only agent needs (~660 tokens instead of ~43,200). Unset loads all 198.). The author declared them in the registry entry; get the values from the project itself.

Available tools 4

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

experiment
experiment_scoreboard
Live state of run402's public demand experiment: on-chain USDC receipts to the seller wallet since launch (2026-07-20), split internal vs external, plus the claims wall. Chain-verified, honest by construction.
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.
submit
submit_wall_claim
Prove your agent paid an x402 endpoint on run402: submit the Base-mainnet tx hash of a USDC payment (>= $0.03 to the run402 seller) and join the public claims wall at scoreboard.run402.com/gallery. Free; verified on-chain before it lands.
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.

Endpoints

URLTransportStateLatencyChecked
https://mcp.run402.com/mcp streamable-http answering 473 ms 3 min ago

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Run402 — questions

Answers built from our own checks of this server.

What can Run402 do?
It exposes 4 tools, read directly from the server on our last check. Among them: experiment_scoreboard, run402_quickstart, submit_wall_claim, 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 630 ms. The bar chart above shows every period we have measured.
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 with the file path 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 4 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 630 ms on average, which is faster than 20% 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 3 775 times in the last week. Week over week that is +127%. 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?
Yes — it is published under the MIT licence, written in TypeScript, 24 stars on GitHub and 56 open issues. The source link is on this page, so you can read exactly what it does with your data before you connect it.