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Xenarch MCP server

by xenarch-ai·io.github.xenarch-ai/xenarch-mcp·v1.3.1·1 stars
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Xenarch — x402 MCP server for AI agent payments. Non-custodial, USDC on Base L2.

B77/100grade B
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Safety scan
B77/100

full report

Adoption
Growing

1 stars154 downloads/wk

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If you have run it, two minutes of your experience saves the next person an afternoon.

Xenarch tools (4, 1 write)

write = sends, deletes, buys or posts

Read from the package source without running it. The installed server may list more.

  • xenarch_check_gate

    Check if a URL or domain has an x402 payment gate. Returns gate status, accepted payment requirements (price, asset, network), and the seller wallet. Use this before paying to confirm pricing, when a URL returns HTTP 402 Payment Required, or when a user asks whether content is paywalled.

  • xenarch_get_history

    List past USDC micropayments made by this wallet through Xenarch. Returns transaction hashes, URLs, domains, amounts in USD, timestamps, total spend, and payment count. Optionally filter by domain. Use this to audit spending, check if you already paid for a resource, or track agent expenditure.

  • xenarch_paywrite action

    Pay an x402-gated URL with USDC on Base L2 and return the gated content. Signs an EIP-3009 transferWithAuthorization, settles on-chain, then re-fetches the resource with proof of payment. Returns the on-chain tx_hash, seller wallet, and the response body. Settles directly to the seller wallet — no Xenarch contract in the money flow, no custodial balance. The agent wallet only ever holds USDC; no E

  • xenarch_wallet_status

    Show the agent's local payment wallet: its address, USDC balance on Base, and whether it's funded. Use this to find the address the user needs to top up with USDC, or to check the balance before paying. This is the wallet that signs payments — separate from the wallet used to sign in to the dashboard.

Public scan report

scanner v0.1.9 · 2026-09-26 · same rubric, same numbers if you re-run it

no findings
  • Code scan41 source files scanned; 25 source files scanned25/25
  • –Live reliabilityno gateway calls yet and no remote to proben/a
  • –Tool poisoningtools not inspected (local package is not executed); not countedn/a
  • Auth qualitystatic API keys via environment variables6/15
  • Maintenancelast push 56 days ago12/15
  • Maintainer identityregistry namespace matches repository owner7/10
Overall 77/100. Components that don't apply are left out of the denominator. Any critical finding is an F.RubricAppeal a findingJSON

How Xenarch compares

Against every graded AI and agents MCP server, from our own scans and uptime checks. Updated after each scan run.

Safety score
77/100
higher than 50% of 4,460 AI and agents servers
Tools
4
the typical AI and agents server has 6
Tools that change things
25%
typical: 0%. Fewer write tools means less an agent can break
GitHub stars
1
more than 50% of 2,711 AI and agents servers
Downloads a week
154
more than 71% of 1,538 AI and agents servers with a package

What its tools let an agent do: 3 read · 1 change

Install Xenarch in Claude Code, Cursor or VS Code

Runs npx -y @xenarch/agent-mcp on your machine. Read the scan report first; the gateway never runs local packages.

claude mcp add xenarch-mcp -- npx -y @xenarch/agent-mcp
Add to Cursor

What the publisher says

From the Xenarch repository's README, as published. We do not edit it. Read it on GitHub

Xenarch — x402 MCP server for AI agent payments

Xenarch is a non-custodial x402 MCP server. AI agents — Claude, Cursor, LangChain, CrewAI — pay for HTTP 402—gated APIs and content with USDC micropayments on Base L2. No API keys, no subscriptions, no credit card on file. The agent wallet never needs ETH; USDC is the only token it ever holds. Payments settle on-chain: agent wallet → publisher wallet, direct. 0% Xenarch fee — there's no Xenarch contract in the money flow.

What makes Xenarch different

How it works

1. Discover    xenarch_check_gate("example.com")
               → { gated: true, accepts: [...] }

2. Pay         xenarch_pay("example.com")
               → x402-fetch signs an EIP-3009 USDC transferWithAuthorization
               → Settlement goes on-chain
               → Re-fetches the resource with proof of payment
               → { tx_hash, content }

No API keys. No signup. The agent wallet only ever needs USDC — no ETH, no gas coin of any kind. Xenarch never holds funds and there is no Xenarch contract between the agent and the publisher.

MCP tools

29 tools across three groups. Group 1 (discovery & payments) works with just a wallet. Groups 2 and 3 (control plane + merchant) manage your Xenarch account and need a SIWE session — run xenarch agent login once (see Account tools auth).

1. Discovery & payments — agent wallet only

2. Agent control plane — manage your spending agent (SIWE session)

Caps, scope, kill-switch, and API keys for the operator's agent. Privileged (loosening) operations require confirm: true; tightening is free.

Shortened. The full README is on GitHub.

Nothing above is checked by us. What we check is on the safety report.

Xenarch: common questions

Is Xenarch MCP server safe?
Mostly: it is graded B (77/100). Read the Xenarch safety report
How do I install Xenarch?
It runs on your machine. Copy the Claude Code, Cursor, VS Code or Claude Desktop config from the install section.
Does Xenarch need an API key?
Yes. The registry entry asks for XENARCH_PRIVATE_KEY.
Is Xenarch maintained?
The last commit was 95 days ago (2026-08-01). The latest release is v1.3.1.
What can I use instead of Xenarch?
Servers from other publishers that do the same job: Agoragentic Agent OS MCP server, IWE (iwe.md) MCP server and Agent Sniper MCP server.
How does Xenarch compare with other AI and agents MCP servers?
safety score 77/100 (higher than 50% of 4,460 AI and agents servers); tools 4 (the typical AI and agents server has 6); tools that change things 25% (typical: 0%. Fewer write tools means less an agent can break). Full comparison.

Alternatives to Xenarch

Same job from other publishers: the closest match first, then the best rated.

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