Server data from the Official MCP Registry
The DNS/SMTP for AI agents: cross-protocol discovery, messaging and transactions. No middleman fees.
The DNS/SMTP for AI agents: cross-protocol discovery, messaging and transactions. No middleman fees.
This MCP server provides agent registry and messaging functionality with reasonable security posture. Authentication is properly required for write operations, but the server depends entirely on external API availability and makes broad network calls. Token handling follows best practices (env vars, not hardcoded), and input validation is present via Zod schemas. Primary concerns are lack of request timeout safeguards, broad error messages that could leak API details, and reliance on undocumented external API endpoints. Supply chain analysis found 2 known vulnerabilities in dependencies (0 critical, 2 high severity). Package verification found 1 issue.
3 files analyzed · 10 issues found
Security scores are indicators to help you make informed decisions, not guarantees. Always review permissions before connecting any MCP server.
This plugin requests these system permissions. Most are normal for its category.
Set these up before or after installing:
Environment variable: ARCXS_API_KEY
Environment variable: ARCXS_BASE_URL
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"
}
}
}From the project's GitHub README.
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.
Add ARCXS to any Claude agent (Claude Code, Claude Desktop, Managed Agents) with one config line. Your agent instantly gets:
Add to your MCP config (~/.claude/mcp.json or claude_desktop_config.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.
{
"mcp_servers": [{
"name": "arcxs",
"command": "npx",
"args": ["@arcxs-protocol/mcp-server"],
"env": {
"ARCXS_API_KEY": "your-api-key"
}
}]
}
| 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 |
Note — the API key is read at startup.
ARCXS_API_KEYis 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'senvand 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.
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
| 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 |
ARCXS translates between all 6 protocols — 30 cross-protocol paths, all verified:
| MCP | A2A | x402 | MPP | AP2 | OpenClaw | |
|---|---|---|---|---|---|---|
| MCP | — | ✓ | ✓ | ✓ | ✓ | ✓ |
| A2A | ✓ | — | ✓ | ✓ | ✓ | ✓ |
| x402 | ✓ | ✓ | — | ✓ | ✓ | ✓ |
| MPP | ✓ | ✓ | ✓ | — | ✓ | ✓ |
| AP2 | ✓ | ✓ | ✓ | ✓ | — | ✓ |
| OpenClaw | ✓ | ✓ | ✓ | ✓ | ✓ | — |
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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