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io.github.swarm-agent-operator/swarm-x402-mcp

Official registry Search and web

Pay-per-call x402 services: repo scans, web research, site checks, page text. USDC on Base.

Source code Documentation

Install

Add this to your client's MCP configuration (Claude Desktop: claude_desktop_config.json; Cursor: .cursor/mcp.json; VS Code and others use the same "mcpServers" shape).

NPM package swarm-x402-mcp
Claude Code 
claude mcp add swarm-x402-mcp -e 'SWARM_WALLET_KEY=<your swarm_wallet_key>' -e 'SWARM_MAX_USD=<SWARM_MAX_USD>' -- npx -y swarm-x402-mcp@0.1.4
JSON configuration (Claude Desktop, Cursor, VS Code) 
{
    "mcpServers": {
        "swarm-x402-mcp": {
            "command": "npx",
            "args": [
                "-y",
                "swarm-x402-mcp@0.1.4"
            ],
            "env": {
                "SWARM_WALLET_KEY": "<your swarm_wallet_key>",
                "SWARM_MAX_USD": "<SWARM_MAX_USD>"
            }
        }
    }
}

Environment variables

  • SWARM_WALLET_KEY secret Private key of a dedicated wallet with a little USDC on Base. Without it, tools only quote.
  • SWARM_MAX_USD Refuse any call priced above this many dollars (default 1).

Documentation

From the project's README on GitHub, refreshed weekly. Links open on GitHub.

Contents
  1. swarm-x402-mcp
  2. Tools
  3. Install
  4. How payment works
  5. Links

swarm-x402-mcp

MCP server with paid tools: your agent pays per call in USDC on Base. No API key, no account.

MCP server for SWARM, an autonomous agent that sells small services over x402. Add it to Claude Code, Cursor, Claude Desktop or any MCP client. Your agent can then call SWARM's services and pay per call in USDC on Base. You need no account and no API key, and you are charged only when the service delivers.

Tools

Six tools. Each one calls SWARM's shop over the network and, with a wallet key, pays in USDC, so none is read-only; every tool declares this in its MCP annotations (readOnlyHint: false, openWorldHint: true):

ToolWhat you sendWhat you getPrice
code_healtha public GitHub repo URLstatic scan: TODO/FIXME debt, oversized files, secret heuristics, hygiene$0.05
summarya topicone-page brief, researched on the live web, sources linked$0.75
reporta topicfull Markdown report, researched on the live web, sources linked$0.99
utilitiesan operation (uuid, hash, base64, …)UUIDs, hashes, base64, URL encoding, passwords, timestamps$0.02
site_checka URLis it up: HTTP status, final URL after redirects, response time, TLS errors$0.002
read_pagea URLthe readable text of the page (menus, scripts and markup removed)$0.002

Install

You need Node.js 20 or newer. Use a dedicated wallet holding only a few dollars of USDC on Base for SWARM_WALLET_KEY.

Claude Code

claude mcp add --transport stdio swarm --env SWARM_WALLET_KEY=0x… --env SWARM_MAX_USD=1 -- npx -y swarm-x402-mcp

Cursor (~/.cursor/mcp.json) and Claude Desktop (Settings → Developer → Edit Config)

{
  "mcpServers": {
    "swarm": {
      "command": "npx",
      "args": ["-y", "swarm-x402-mcp"],
      "env": {
        "SWARM_WALLET_KEY": "0x…",
        "SWARM_MAX_USD": "1"
      }
    }
  }
}
  • SWARM_WALLET_KEY: the private key of the wallet that pays. Without it, the tools still list and quote; they explain the price and don't pay.
  • SWARM_MAX_USD (default 1): the server refuses any call priced above this, before signing anything.

How payment works

Each call first reads SWARM's 402 quote without paying. It checks that the network is Base mainnet and that the price is under your limit. Then it pays with the official x402 client (@x402/fetch). SWARM verifies the payment, does the work, and settles only if the work succeeded.

MIT licence.

Frequently asked questions

What is io.github.swarm-agent-operator/swarm-x402-mcp?

Pay-per-call x402 services: repo scans, web research, site checks, page text. USDC on Base.

How do I install io.github.swarm-agent-operator/swarm-x402-mcp?

It runs on your machine. In Claude Code: claude mcp add swarm-x402-mcp -e 'SWARM_WALLET_KEY=<your swarm_wallet_key>' -e 'SWARM_MAX_USD=<SWARM_MAX_USD>' -- npx -y swarm-x402-mcp@0.1.4. For other clients, paste the JSON configuration from this page into their MCP settings.

Does io.github.swarm-agent-operator/swarm-x402-mcp need an API key?

Yes. It expects SWARM_WALLET_KEY, which you set in its configuration.

Is io.github.swarm-agent-operator/swarm-x402-mcp open source?

Yes. Its code is on GitHub under the MIT license.

Who maintains io.github.swarm-agent-operator/swarm-x402-mcp?

It is published by swarm-agent-operator. AI.tn lists it but does not maintain or endorse it.

From the official MCP Registry. Listing is not an endorsement: review a server's code and permissions before giving it access to your data.