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marktplaats-mcp: the Marktplaats & 2dehands MCP server

marktplaats-mcp is an MCP server for Marktplaats.nl (Netherlands) and 2dehands.be (Belgium), the Dutch and Belgian second-hand classifieds (tweedehands, petites annonces d'occasion). It lets Claude, ChatGPT, Cursor, Codex, Gemini, VS Code Copilot, Cline, opencode and any other MCP client search listings, filter on category-specific attributes, vet sellers, compare prices, monitor new ads, and, with your own login, read and send messages, place bids and manage favorites and your own ads. No API key. Runs locally over stdio, or as a hosted endpoint you paste into claude.ai in one step.

🌐 Use on claude.ai (no install)

A hosted copy of this server runs at https://marktplaats-mcp.jaspnerd.dev/mcp, ready for claude.ai in your browser or the Claude mobile app. Custom connectors work on every Claude plan, including Free.

1. Open claude.ai → Settings → Connectors → Add custom connector.
2. Paste https://marktplaats-mcp.jaspnerd.dev/mcp as the URL and click Add. No account or key needed.
3. Ask Claude: "Search Marktplaats for an OLED TV under €400 near 3011 AB and check the seller."

The hosted endpoint runs the same code as the PyPI package, is rate-limited per client and only offers the read-only tools. For your own account, install it locally below.

🚀 Quickstart (local)

The only prerequisite is uv (brew install uv or curl -LsSf https://astral.sh/uv/install.sh | sh).

Claude Code, one command:

claude mcp add marktplaats -- uvx marktplaats-mcp

Then ask: "Find a racefiets under €500 within 25 km of 1011 AB, frame 57-61 cm, and tell me if the sellers look legit."

👤 Use your own account (messages, favorites, bids, your ads)

Marktplaats has no public API and its login uses SMS two-factor authentication and reCAPTCHA, so this server never asks for your password. Instead it copies the session from a browser you are already logged into, the way yt-dlp --cookies-from-browser does:

uvx --from 'marktplaats-mcp[login]' marktplaats-mcp login

That looks for a Marktplaats session in Chrome, Brave, Firefox, Safari, Edge, Arc and friends, verifies it against the site, and stores it in ~/.config/marktplaats-mcp/session.json, readable by your user only. Restart your MCP client and the account tools appear. Useful commands:

marktplaats-mcp login --site 2dehands  # also import your 2dehands.be session
marktplaats-mcp login --read-only      # never send, bid or change favorites
marktplaats-mcp login --window         # open a browser window and log in there instead
marktplaats-mcp login --paste          # paste a Cookie header from DevTools instead
marktplaats-mcp status                 # is the stored session still valid?
marktplaats-mcp logout                 # delete it

Or set MARKTPLAATS_COOKIE / TWEEDEHANDS_COOKIE (the request Cookie header) in your client's config. Sessions last weeks; when one expires the tools tell you to log in again.

What can go wrong, and what cannot. Sending a message, contacting a seller and placing a bid return a preview first and only act when called again with confirm=true, so your agent shows you what it is about to do. A bid is binding on Marktplaats; the tool refuses bids below the listing's minimum and is marked destructive so clients ask before running it. Every confirmed write is appended to ~/.local/state/marktplaats-mcp/writes.jsonl. Your session is only ever sent to marktplaats.nl or 2dehands.be, and the hosted endpoint never registers account tools. Automated ad placement is forbidden by Marktplaats' terms and is deliberately not implemented.

📦 Install in your favorite client

Every config runs the same stdio server via uvx marktplaats-mcp.

{
  "mcpServers": {
    "marktplaats": {
      "command": "uvx",
      "args": ["marktplaats-mcp"]
    }
  }
}

[mcp_servers.marktplaats]
command = "uvx"
args = ["marktplaats-mcp"]

{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "marktplaats": {
      "type": "local",
      "command": ["uvx", "marktplaats-mcp"],
      "enabled": true
    }
  }
}

{
  "mcpServers": {
    "marktplaats": {
      "command": "uvx",
      "args": ["marktplaats-mcp"]
    }
  }
}

{
  "servers": {
    "marktplaats": {
      "type": "stdio",
      "command": "uvx",
      "args": ["marktplaats-mcp"]
    }
  }
}

{
  "mcpServers": {
    "marktplaats": {
      "command": "uvx",
      "args": ["marktplaats-mcp"]
    }
  }
}

{
  "mcpServers": {
    "marktplaats": {
      "command": "uvx",
      "args": ["marktplaats-mcp"]
    }
  }
}

{
  "mcpServers": {
    "marktplaats": {
      "command": "uvx",
      "args": ["marktplaats-mcp"]
    }
  }
}

{
  "mcpServers": {
    "marktplaats": {
      "command": "uvx",
      "args": ["marktplaats-mcp"]
    }
  }
}

🧰 Tools

Read-only tools carry the matching MCP annotations, so clients skip confirmation prompts for them and ask for the write tools. Every tool returns structured output with a real schema. Two prompts, bargain_hunt and vet_listing, encode the common workflows.

What you can say, and what happens

🔒 Safety model

• No credentials by default. Searching, details, seller checks, filters, price statistics and monitoring need no account.
• Your session stays yours. The local server reads the cookie from your browser or a file only you can read, sends it only to marktplaats.nl / 2dehands.be, and never logs it. The hosted endpoint refuses to start with account credentials configured.
• Writes are explicit. Sending and bidding preview first and require confirm=true; bids below the minimum are refused; login --read-only or MARKTPLAATS_READ_ONLY=1 disables writes entirely; every confirmed write is logged locally.
• Untrusted content is labelled. Listing text and messages are written by other users; the server tells the model to treat them as data, never as instructions.
• Polite to the marketplace. Requests are spaced (MARKTPLAATS_MIN_INTERVAL_MS, default 200), retried with backoff and Retry-After, and search pages are cached for a minute. The hosted endpoint is rate-limited per client and globally.
• No affiliate links, no tracking. Listing URLs are returned exactly as the marketplaces publish them.

⚖️ How this compares

Credit where it is due: PonClick's server came first and its listing formatting informed this one, and gjoris pioneered the embedded-page parsing and the live canary. See THIRD_PARTY_NOTICES.md.

❓ FAQ

Is there an MCP server for Marktplaats?

Yes, this one. Free, open source (MIT), no API key. Paste the hosted URL into claude.ai or run uvx marktplaats-mcp.

Does it work with 2dehands.be and Belgium?

Yes. Every tool takes site="2dehands", and language="nl" or "fr" narrows Belgian results to one language.

Do I need a Marktplaats account or API key?

No. Only the account tools need your own login, and they use your existing browser session rather than a password.

Can AI read and send my Marktplaats messages, or place bids?

Yes, with the local server after marktplaats-mcp login. Sending and bidding show a preview and only act after you confirm.

Where are my login credentials stored?

In ~/.config/marktplaats-mcp/session.json on your machine, readable by your user only, or in the environment variables you set yourself. They are only ever sent to marktplaats.nl / 2dehands.be. marktplaats-mcp logout removes them.

Can I use it without installing anything?

Yes: the hosted endpoint https://marktplaats-mcp.jaspnerd.dev/mcp works in claude.ai, including the Free plan and mobile apps. It offers the read-only tools.

Does it work with ChatGPT, Cursor, Gemini, VS Code and Cline?

Yes. Any client that runs stdio servers can use uvx marktplaats-mcp; clients that support remote servers can use the hosted URL.

Is this official or affiliated with Marktplaats?

No. It is an independent open source project with no ties to Marktplaats, 2dehands or Adevinta. It uses the same public JSON endpoints the websites use; that API is undocumented and may change, which is why a live canary runs every day.

Why do I sometimes see fewer results than the limit, or total_count looks high?

Paid promotions (DAGTOPPER, TOPADVERTENTIE) are filtered out by default; pass include_sponsored=true to see them. total_count is the marketplace's raw count before that filtering.

Which Python versions are supported?

3.10 and up. CI tests 3.11 through 3.13 on Linux, macOS and Windows.

⚙️ Configuration

🗺️ Roadmap

• Cross-site search (NL and BE in one call)
• Saved-search creation from the agent
• Claude Desktop extension bundle (MCPB)

🤝 Contributing

PRs welcome. See CONTRIBUTING.md for the dev setup: uv sync --all-groups, then uv run pytest. uv run python scripts/e2e_smoke.py runs the live canary.

This project reuses proven ideas from marktplaats-py, marktplaats-monitor, marktplaats-2dehands-mcp and PonClick/marktplaats-mcp. Details in THIRD_PARTY_NOTICES.md.

If this saved you a trip to Marktplaats, a star helps other people find it.

📄 License

MIT © 2026 jasp-nerd

_{mcp-name: io.github.jasp-nerd/marktplaats-mcp}