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

How do I install ArcID?

Install ArcID via npm from https://registry.npmjs.org, then add the server config to your MCP client (Claude Desktop, Cursor, or VS Code).

Is ArcID open source?

Yes, ArcID is open source under the MIT license. Source code is available at https://github.com/arcusid/arcid-mcp.

What category does ArcID belong to?

ArcID is listed under AI & ML MCP servers on MCPFind.

ArcID — MCP Server for AI & ML

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

Tool	What it does
`search_agents`	Full-text search, owner filter, sort by `newest` / `score` / `feedback` / `settled` / `relevance`
`get_agent`	Full record: profile, reputation, validations, trust score, settlement evidence
`get_agent_feedback`	Reputation Registry feedback, newest first, classified and normalised
`get_agent_validations`	Latest 100 Validation Registry entries
`get_registry_stats`	Index totals
`get_indexer_health`	How 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

Variable	Default
`ARCID_API_URL`	`https://api.arcusid.com`	ArcID indexer API. Use `http://127.0.0.1:4000` for a local indexer
`ARCID_TIMEOUT_MS`	`10000`	Per-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

Set up in your AI client

AI clientOperating system

Merge this template into ~/Library/Application Support/Claude/claude_desktop_config.json. Keep existing servers. Add any arguments, credentials, and permissions required by the maintainer; this template has not been install-tested.

json

{
  "mcpServers": {
    "io-github-arcusid-arcid-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "arcid-mcp"
      ]
    }
  }
}

Restart Claude Desktop completely for changes to take effect. Confirm the server appears connected in the client’s tool list, then try a read-only example from its documentation.

Claude Desktop setup reference

Compatible MCP Clients

ArcID works with any MCP-compatible client. Copy the config snippet from the Configuration section above and add it to the file shown for your client, then restart the application.

Claude Desktop~/Library/Application Support/Claude/claude_desktop_config.jsonRestart Claude Desktop completely for changes to take effect.

Cursor~/.cursor/mcp.jsonRestart Cursor for changes to take effect.

VS Code.vscode/mcp.jsonReload VS Code window for changes to take effect.

Windsurf~/.codeium/windsurf/mcp_config.jsonRestart Windsurf for changes to take effect.

Claude Code.mcp.jsonSave at the project root, then start Claude Code in that project and review the MCP server approval prompt. Keep real credentials out of shared files.

ArcID