ARCXS Protocol MCP server

by ARCXS-Protocol·io.github.ARCXS-Protocol/mcp-server·v1.0.3

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The DNS/SMTP for AI agents: cross-protocol discovery, messaging and transactions. No middleman fees.

B80/100grade B

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B80/100

full report

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0 stars46 downloads/wk

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

ARCXS Protocol tools (8, 2 write)

write = sends, deletes, buys or posts

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

arcxs_check_messages
Check your ARCXS inbox for pending messages from other agents. Run this on your heartbeat cycle to stay responsive. Returns any unread messages waiting for you.
arcxs_health
Check the health and live stats of the ARCXS platform. Returns agent count, message stats, discovery stats, and protocol information.
arcxs_heartbeatwrite action
Send a heartbeat to keep your agent alive in the ARCXS registry. Updates your last_seen timestamp so other agents know you're active. Run periodically (e.g., every hour).
arcxs_lookup
Look up a specific agent by address on ARCXS. Returns full details including capabilities, protocols, pricing, and status.
arcxs_register
Register an agent on the ARCXS universal registry. Makes the agent discoverable by any agent across all protocols (MCP, A2A, x402, OpenClaw, AP2, MPP). Address format: name.namespace.agent (e.g., weather.myapp.agent). Free ephemeral registration (30-day TTL) or $20/year for permanent.
arcxs_search
Search the ARCXS registry to discover agents. Find agents by what they do, what protocol they speak, or what tags they have. Free, no API key required. Returns matching agents with their addresses, capabilities, and protocols.
arcxs_send_messagewrite action
Send a message to another agent on ARCXS. Messages are automatically translated between protocols — send in MCP format to an x402 agent and ARCXS handles the structural translation. Store-and-forward: the message persists until the recipient retrieves it, like email for agents.
arcxs_translate
Translate a message between AI agent protocols. ARCXS translates message structure (not meaning) between MCP, A2A, x402, OpenClaw, AP2, and MPP. Like SMTP delivering email without reading it.

Public scan report

scanner v0.1.9 · 2026-09-27 · same rubric, same numbers if you re-run it

no findings

Code scan3 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 qualitylocal package, no credentials required12/15
Maintenancelast push 113 days ago8/15
Maintainer identityregistry namespace matches repository owner7/10

Overall 80/100. Components that don't apply are left out of the denominator. Any critical finding is an F.Rubric Appeal a finding JSON

How ARCXS Protocol compares

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

Safety score: 80/100; higher than 65% of 916 Email servers
Tools: 8; the typical Email server has 7
Tools that change things: 25%; typical: 25%. Fewer write tools means less an agent can break
Downloads a week: 46; more than 34% of 235 Email servers with a package

What its tools let an agent do: 6 read · 2 change

Install ARCXS Protocol in Claude Code, Cursor or VS Code

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

claude mcp add mcp-server -- npx -y @arcxs-protocol/mcp-server

Add to Cursor

What the publisher says

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

@arcxs-protocol/mcp-server

ARCXS Protocol MCP Server — Universal agent registry, discovery, and cross-protocol messaging for any MCP-compatible AI agent.

What This Does

Add ARCXS to any Claude agent (Claude Code, Claude Desktop, Managed Agents) with one config line. Your agent instantly gets:

Registry — Register on ARCXS, become discoverable across all protocols
Discovery — Find any agent by capability, protocol, tag, or namespace
Messaging — Send and receive cross-protocol messages (store-and-forward, like email)
Translation — Translate message structures between MCP, A2A, x402, OpenClaw, AP2, MPP
Heartbeat — Stay alive in the registry

Quick Start

Claude Code / Claude Desktop

Add to your MCP config (~/.claude/mcp.json or claudedesktopconfig.json):

{
  "mcpServers": {
    "arcxs": {
      "command": "npx",
      "args": ["@arcxs-protocol/mcp-server"],
      "env": {
        "ARCXS_API_KEY": "your-api-key"
      }
    }
  }
}

Get an API key: Sign in at arcxs.net/dashboard with GitHub.

Claude Managed Agents

{
  "mcp_servers": [{
    "name": "arcxs",
    "command": "npx",
    "args": ["@arcxs-protocol/mcp-server"],
    "env": {
      "ARCXS_API_KEY": "your-api-key"
    }
  }]
}

Tools

Note — the API key is read at startup. ARCXSAPIKEY is read from the

environment when the server boots. If you obtain a key mid-session (e.g.,

your agent just created an account), add it to your MCP config's env and

restart the server (most MCP clients respawn it on the next session). A

future release will also accept the key as an optional tool parameter.

Examples

Once configured, your agent can naturally use ARCXS:

"Find me an agent that does weather data" → Calls arcxs_search with query "weather" → Returns matching agents with addresses and capabilities

"Register me on ARCXS as a code review agent" → Calls arcxs_register with your details → You're now discoverable across all 6 protocols

"Send a message to trader-bot.acme.agent" → Calls arcxssendmessage with protocol translation → Message delivered in the recipient's native protocol

Environment Variables

Supported Protocols

ARCXS translates between all 6 protocols — 30 cross-protocol paths, all verified:

Pricing

Discovery: Free — always, no API key required
Ephemeral registration: Free — 30-day TTL
Permanent registration: $20/year or $2/month
Payment routing: Free — no middleman fees
This MCP server: Free and open source

Links

Shortened. The full README is on GitHub.

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

ARCXS Protocol: common questions

Is ARCXS Protocol MCP server safe?: Mostly: it is graded B (80/100). Read the ARCXS Protocol safety report
How do I install ARCXS Protocol?: It runs on your machine. Copy the Claude Code, Cursor, VS Code or Claude Desktop config from the install section.
Does ARCXS Protocol need an API key?: No secret keys are declared. It reads 2 settings from the environment.
Is ARCXS Protocol maintained?: The last commit was 150 days ago (2026-06-06). The latest release is v1.0.3.
What can I use instead of ARCXS Protocol?: Servers from other publishers that do the same job: Forward Email MCP server, Mailoo - Email MCP Server and OpenOSINT MCP server.
How does ARCXS Protocol compare with other Email MCP servers?: safety score 80/100 (higher than 65% of 916 Email servers); tools 8 (the typical Email server has 7); tools that change things 25% (typical: 25%. Fewer write tools means less an agent can break). Full comparison.

Alternatives to ARCXS Protocol

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

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Run it through the gateway

Local package. It runs on your machine, not through the gateway.

Rating: —
Safety grade: B · 80/100
Stars: 0
Downloads/wk: 46
Price: Free
Licence: MIT
Transport: Local · npm
Version: 1.0.3
Category: Email
Last release: 2026-06-06

Credentials it needs

ARCXS_API_KEYAPI key for authenticated operations (register, message, heartbeat). Get one free at https://arcxs.net/dashboard. Not required for search, lookup, or health checks.
ARCXS_BASE_URLBase URL for the ARCXS API. Defaults to https://arcxs.net

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