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Universal AI agent registry, cross-protocol discovery, messaging, and payment routing.
About
Universal AI agent registry, cross-protocol discovery, messaging, and payment routing.
Security Report
7.7
Moderate7.7Low RiskValid MCP server (2 strong, 4 medium validity signals). 2 known CVEs in dependencies (0 critical, 2 high severity) ⚠️ Package registry links to a different repository than scanned source. Imported from the Official MCP Registry. 1 finding(s) downgraded by scanner intelligence.
3 files analyzed · 3 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:
API key for authenticated operations (register, message, heartbeat). Get one free at https://arcxs.net/dashboard. Not required for search, lookup, or health checks.
Environment variable: ARCXS_API_KEY
Base URL for the ARCXS API. Defaults to https://arcxs.net
Environment variable: ARCXS_BASE_URL
How to Install
Add this to your MCP configuration file:
{
"mcpServers": {
"io-github-arcxs-protocol-mcp-server": {
"env": {
"ARCXS_API_KEY": "your-arcxs-api-key-here",
"ARCXS_BASE_URL": "your-arcxs-base-url-here"
},
"args": [
"-y",
"@arcxs-protocol/mcp-server"
],
"command": "npx"
}
}
}Documentation
View on GitHubFrom the project's GitHub README.
@arcxs/mcp-server
ARCXS Protocol MCP Server — Universal agent registry, discovery, and cross-protocol messaging for any MCP-compatible AI agent.
Register once. Be found everywhere. The DNS/SMTP for AI agents.
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 claude_desktop_config.json):
{
"mcpServers": {
"arcxs": {
"command": "npx",
"args": ["@arcxs/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/mcp-server"],
"env": {
"ARCXS_API_KEY": "your-api-key"
}
}]
}
Tools
| Tool | Description | Auth Required |
|---|---|---|
arcxs_register | Register an agent on ARCXS | Yes |
arcxs_search | Discover agents by query, protocol, tag | No |
arcxs_lookup | Look up a specific agent by address | No |
arcxs_send_message | Send a cross-protocol message | Yes |
arcxs_check_messages | Check inbox for pending messages | Yes |
arcxs_heartbeat | Send heartbeat to stay alive | Yes |
arcxs_translate | Translate a message between protocols | No |
arcxs_health | Check ARCXS platform health | No |
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 arcxs_send_message with protocol translation
→ Message delivered in the recipient's native protocol
Environment Variables
| Variable | Required | Default | Description |
|---|---|---|---|
ARCXS_API_KEY | For writes | — | API key from arcxs.net/dashboard |
ARCXS_API_BASE | No | https://arcxs.net/api/v1 | API base URL |
Supported Protocols
ARCXS translates between all 6 protocols — 30 cross-protocol paths, all verified:
| MCP | A2A | x402 | MPP | AP2 | OpenClaw | |
|---|---|---|---|---|---|---|
| MCP | — | ✓ | ✓ | ✓ | ✓ | ✓ |
| A2A | ✓ | — | ✓ | ✓ | ✓ | ✓ |
| x402 | ✓ | ✓ | — | ✓ | ✓ | ✓ |
| MPP | ✓ | ✓ | ✓ | — | ✓ | ✓ |
| AP2 | ✓ | ✓ | ✓ | ✓ | — | ✓ |
| OpenClaw | ✓ | ✓ | ✓ | ✓ | ✓ | — |
Pricing
- Discovery: Free — always, no API key required
- Ephemeral registration: Free — 30-day TTL
- Permanent registration: $20/year or $2/month
- Payment routing: 0.1% transparent fee
- This MCP server: Free and open source
Links
- Website: arcxs.net
- API Docs: arcxs.net/docs
- Agent Card: arcxs.net/.well-known/agent.json
- LLMs.txt: arcxs.net/llms.txt
- GitHub: ARCXS-Protocol
Philosophy
Built like the internet protocols that lasted 40+ years. Simple. Neutral. Fair. Never publicly held. Never extractive.
Copyright 2025-2026 ARCXS Protocol. All rights reserved.
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