English Français العربية

ArcID

Official registry AI and agents

Look up AI agents on Arc: ERC-8004 identity, feedback, validations and USDC-backed trust scores.

Source code Website Documentation

Install

Add this to your client's MCP configuration (Claude Desktop: claude_desktop_config.json; Cursor: .cursor/mcp.json; VS Code and others use the same "mcpServers" shape).

Remote (streamable-http)
Claude Code 
claude mcp add --transport http arcid 'https://mcp.arcusid.com/mcp'
JSON configuration (Claude Desktop, Cursor, VS Code) 
{
    "mcpServers": {
        "arcid": {
            "type": "http",
            "url": "https://mcp.arcusid.com/mcp"
        }
    }
}
NPM package arcid-mcp
Claude Code 
claude mcp add arcid -e 'ARCID_API_URL=<ARCID_API_URL>' -- npx -y arcid-mcp@0.2.0
JSON configuration (Claude Desktop, Cursor, VS Code) 
{
    "mcpServers": {
        "arcid": {
            "command": "npx",
            "args": [
                "-y",
                "arcid-mcp@0.2.0"
            ],
            "env": {
                "ARCID_API_URL": "<ARCID_API_URL>"
            }
        }
    }
}

Environment variables

  • ARCID_API_URL ArcID indexer API. Defaults to https://api.arcusid.com

Documentation

From the project's README on GitHub, refreshed weekly. Links open on GitHub.

Contents
  1. arcid-mcp
  2. Tools
  3. Connect
  4. Configuration
  5. Development
  6. License

arcid-mcp

MCP server for ArcID, the identity and reputation layer for AI agents on Arc. It lets Claude and other MCP clients look up agents registered in the ERC-8004 registries: profiles, owners, feedback, validations and USDC-weighted trust scores.

Read-only. No wallet or API key needed.

Tools

ToolWhat it does
search_agentsFull-text search, owner filter, sort by newest / score / feedback / settled / relevance
get_agentFull record: profile, reputation, validations, trust score, settlement evidence
get_agent_feedbackReputation Registry feedback, newest first, classified and normalised
get_agent_validationsLatest 100 Validation Registry entries
get_registry_statsIndex totals
get_indexer_healthHow far the indexer is behind the chain head

Connect

Remote (claude.ai, ChatGPT, any URL-based client)
https://mcp.arcusid.com/mcp

Streamable HTTP, stateless, no authentication.

  • claude.ai / Claude Desktop: Settings → Connectors → Add custom connector → paste the URL.
  • ChatGPT: Settings → Apps & Connectors → Advanced → enable Developer mode → Create → paste the URL, authentication: none.
  • Claude Code: claude mcp add --transport http arcid https://mcp.arcusid.com/mcp
Local (stdio via npx)

No install step needed; clients run it with npx.

Claude Code
claude mcp add arcid -- npx -y arcid-mcp
Claude Desktop / Cursor / other clients
{
  "mcpServers": {
    "arcid": {
      "command": "npx",
      "args": ["-y", "arcid-mcp"]
    }
  }
}

Configuration

VariableDefault
ARCID_API_URLhttps://api.arcusid.comArcID indexer API. Use http://127.0.0.1:4000 for a local indexer
ARCID_TIMEOUT_MS10000Per-request timeout, 1000 to 60000

Development

git clone https://github.com/arcusid/arcid-mcp.git && cd arcid-mcp && npm install
npm run dev            # run from source (tsx)
npm test               # vitest
npm run test:coverage  # 80% threshold enforced
npm run inspect        # MCP Inspector against dist/
npm run worker:dev     # remote endpoint locally (wrangler)
npm run worker:deploy  # typecheck, test, deploy the Worker

The remote endpoint is worker/index.ts: a Cloudflare Worker that serves the same tools over Streamable HTTP (src/http.ts). It reaches the ArcID API through a service binding and forwards the caller's IP, so API rate limits apply per user.

License

MIT

Frequently asked questions

What is ArcID?

Look up AI agents on Arc: ERC-8004 identity, feedback, validations and USDC-backed trust scores.

How do I install ArcID?

It runs as a remote server. In Claude Code: claude mcp add --transport http arcid 'https://mcp.arcusid.com/mcp'. For other clients, paste the JSON configuration from this page into their MCP settings.

Does ArcID need an API key?

Its registry entry lists no required key or secret. Some features may still need an account with the service it connects to.

Is ArcID open source?

Yes. Its code is on GitHub under the MIT license.

Who maintains ArcID?

It is published by arcusid. AI.tn lists it but does not maintain or endorse it.

From the official MCP Registry. Listing is not an endorsement: review a server's code and permissions before giving it access to your data.