@clawfetch/mcp

MCP (Model Context Protocol) server for ClawFetch — Web Intelligence API for AI Agents.

Gives any MCP-compatible client (Claude Desktop, Cursor, Windsurf, OpenClaw, etc.) instant access to ClawFetch's web intelligence tools: fetch pages as markdown, render JS-heavy SPAs, extract structured data from 17+ site types, research topics multi-source, enrich companies from a domain, and check domain availability.

Payments are handled automatically via the x402 protocol — USDC on Base. No API keys, no billing dashboards.

Access and payment

The public hosted MCP endpoint is retired and returns HTTP 410 Gone. Run the MCP locally using the setup below, or call https://api.clawfetch.ai directly. Paid tool calls use your own USDC-funded wallet on Base; ClawFetch does not subsidize requests.

💻 Self-Hosted Mode

Run your own instance with full control over the payment wallet.

Install

npm install -g @clawfetch/mcp

Configure (stdio — for local MCP clients)

Add to your MCP client config (e.g., Claude Desktop):

{
  "mcpServers": {
    "clawfetch": {
      "command": "clawfetch-mcp",
      "env": {
        "CLAWFETCH_PRIVATE_KEY": "0xYOUR_ETHEREUM_PRIVATE_KEY"
      }
    }
  }
}

The private key signs x402 micropayments (USDC on Base). Fund the corresponding address with USDC on Base mainnet.

Run as HTTP Server

Expose the MCP server over HTTP for remote clients:

CLAWFETCH_PRIVATE_KEY=0x... CLAWFETCH_TRANSPORT=http CLAWFETCH_PORT=3001 clawfetch-mcp

This starts a server at http://localhost:3001/mcp using the Streamable HTTP transport (MCP spec compliant). By default it binds to 127.0.0.1 and accepts only loopback Host headers, which blocks DNS-rebinding attacks from web pages. To serve remote clients, set CLAWFETCH_HOST=0.0.0.0 and list your public hostnames in CLAWFETCH_ALLOWED_HOSTS.

HTTP Endpoints

| Endpoint | Method | Description | |----------|--------|-------------| | /mcp | POST | Initialize session — returns Mcp-Session-Id header | | /mcp | GET | SSE stream for server-to-client notifications (requires session ID) | | /mcp | DELETE | Close a session | | /health | GET | Server health check (JSON) |

Session Flow

1. Initialize: POST /mcp with JSON-RPC initialize request → get Mcp-Session-Id header
2. Call tools: POST /mcp with Mcp-Session-Id header + JSON-RPC tools/call request
3. Stream: GET /mcp?sessionId=... for SSE notifications (optional)
4. Close: DELETE /mcp with Mcp-Session-Id header

Tools

| Tool | Description | Cost | |------|-------------|------| | fetch_url | Fetch any URL as clean markdown | $0.001 | | render_page | Render JS-heavy pages (SPAs, React apps) | $0.005 | | extract_data | Extract structured data from 17+ site types | $0.008 | | research_topic | Multi-source research with citations | $0.02 | | check_domains | Check domain name availability | $0.003 | | suggest_domains | Generate available domain suggestions | $0.003 | | parse_document | Parse office docs (docx/pptx/xlsx/pdf/…) to markdown | $0.005 | | enrich_company | Company profile from a domain: socials, emails, tech stack, key pages | $0.02 | | list_extractors | List supported structured data extractors | $0.001 | | health_check | Check API health status | Free | | wallet_info | Show payment wallet address | Free |

Supported Extractors

GitHub repos/profiles, npm packages, PyPI packages, Twitter/X profiles, LinkedIn profiles/companies, YouTube videos/channels, Product Hunt, Hacker News, Reddit, Crunchbase, Wikipedia, and more.

Use list_extractors to see all available types with their schema.

Environment Variables

| Variable | Required | Default | Description | |----------|----------|---------|-------------| | CLAWFETCH_PRIVATE_KEY | Yes* | — | Ethereum private key (0x-prefixed) for x402 payments | | CLAWFETCH_BASE_URL | No | https://api.clawfetch.ai | API base URL | | CLAWFETCH_TRANSPORT | No | stdio | Transport: stdio or http | | CLAWFETCH_HOST | No | 127.0.0.1 | HTTP server bind address | | CLAWFETCH_ALLOWED_HOSTS | No | localhost,127.0.0.1,[::1] | Comma-separated Host header allowlist for the HTTP transport (DNS-rebinding protection) | | CLAWFETCH_PORT | No | 3001 | HTTP server port | | CLAWFETCH_TIMEOUT_MS | No | 60000 | Request timeout in ms | | CLAWFETCH_DEBUG | No | false | Enable debug logging (1 or true) |

* Required for tool calls. Without it the server still starts and lists its tools, resources and prompts (so registries can inspect it), and every call returns setup instructions. Keep this key in your local configuration; never submit it to the ClawFetch website.

Development

git clone https://github.com/clawfetch/clawfetch-mcp.git
cd clawfetch-mcp
npm install
npm run build
npm test

License

MIT