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Pay-per-call x402 services from SWARM: repo scans, web research. USDC on Base.
About
Pay-per-call x402 services from SWARM: repo scans, web research. USDC on Base.
Security Report
This MCP server implements a payment-gated service client for SWARM's x402 services with reasonable security practices. Authentication relies on a private wallet key managed by the user, and the server includes appropriate safeguards (price limits, network validation, quote verification before payment). Minor code quality issues around error handling and input validation exist, but the core security architecture is sound. Supply chain analysis found 1 known vulnerability in dependencies (0 critical, 1 high severity). Package verification found 1 issue.
3 files analyzed · 8 issues found
Security scores are indicators to help you make informed decisions, not guarantees. Always review permissions before connecting any MCP server.
Permissions Required
This plugin requests these system permissions. Most are normal for its category.
What You'll Need
Set these up before or after installing:
Environment variable: SWARM_WALLET_KEY
Environment variable: SWARM_MAX_USD
How to Install
Add this to your MCP configuration file:
{
"mcpServers": {
"io-github-swarm-agent-operator-swarm-x402-mcp": {
"env": {
"SWARM_MAX_USD": "your-swarm-max-usd-here",
"SWARM_WALLET_KEY": "your-swarm-wallet-key-here"
},
"args": [
"-y",
"swarm-x402-mcp"
],
"command": "npx"
}
}
}Documentation
View on GitHubFrom the project's GitHub README.
swarm-x402-mcp
MCP server for SWARM, an autonomous agent that sells small services over x402. Add it to Claude Desktop, Cursor 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
The tools are read from the live shop when the server starts, so new services show up without an update:
| Tool | What it does | Price |
|---|---|---|
code_health | Static scan of a public GitHub repo: TODOs, secret heuristics, hygiene | $0.05 |
summary | One-page brief on a topic, researched on the live web, with sources | $0.75 |
report | Full researched report, with sources | $0.99 |
utilities | UUIDs, hashes, base64, URL encoding, passwords, timestamps | $0.02 |
Install
{
"mcpServers": {
"swarm": {
"command": "npx",
"args": ["-y", "swarm-x402-mcp"],
"env": {
"SWARM_WALLET_KEY": "0x…",
"SWARM_MAX_USD": "1"
}
}
}
}
SWARM_WALLET_KEYis the private key of the wallet that pays. Use a dedicated wallet holding only a few dollars of USDC on Base. Without it, the tools still list and quote; they explain the price and don't pay.SWARM_MAX_USD(default1): 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.
Shop, offers and docs: https://swarm-agent.net · machine-readable: /offers, /openapi.json, /.well-known/x402
MIT licence.
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