Car Rental Brain

npx add-mcp 'https://app.carrentalbrain.com/mcp'

Ask your AI assistant what car hire really costs.

Connect Car Rental Brain to ChatGPT or Claude and it can answer with our measured figures, not guesses: the price per day with a second driver or full cover, the deposit held at the desk, which desks take a debit card and when they close. It then hands you a search link with your dates already filled in, so you see live prices and book in one tap.

The address to add:

https://app.carrentalbrain.com/mcp

Add it to Claude

1. On claude.ai, open Settings → Connectors → Add custom connector.
2. Name it Car Rental Brain, paste the address above, and leave authentication empty.
3. In a chat, switch it on from the tools menu, then just ask.

Add it to ChatGPT

1. Open Settings → Apps & Connectors → Advanced and turn on Developer mode.
2. Create an app: name Car Rental Brain, paste the address above, authentication None.
3. In a new chat, start with "Using Car Rental Brain, …".

Other assistants

Anything that can add a remote MCP server can use it. The setting is always the same three things: the address above, the transport Streamable HTTP, and no authentication. Menu names move around, so look for "Connectors" or "MCP" in settings.

• Perplexity (Pro, Max or Enterprise): Settings → Connectors, add a custom remote connector with the address above and no authentication. Then ask in a chat with the connector switched on.
• Mistral Le Chat: in Connectors, add a custom MCP connector with the address above. Any account owner can do this, the free plan included.
• Grok: go to grok.com/connectors → New Connector → Custom, paste the address above, and Grok finds the tools itself.
• Gemini Enterprise: a workspace admin adds it as a custom MCP server (Streamable HTTP, no authentication); it then shows up for the team.
• Claude Code: run claude mcp add --transport http car-rental-brain https://app.carrentalbrain.com/mcp
• Cursor: with Cursor installed, one click adds it - If Cursor opens without an install prompt: Customize → MCPs → New MCP Server, and in the mcp.json that opens add "car-rental-brain": {"url": "https://app.carrentalbrain.com/mcp"} inside "mcpServers".
• VS Code, Windsurf and other MCP clients: add a server named car-rental-brain with "url": "https://app.carrentalbrain.com/mcp" in the client's MCP settings.

If your assistant can't add servers, just ask it about car hire costs: our airport reports are open for it to read and cite.

Things to ask

"Where in Spain is car hire cheapest with a second driver in March?"

"Faro Airport, 12–19 November, two drivers. What will it really cost, and which supplier holds the smallest deposit?"

"I land in Lisbon at 23:00 with a debit card. What should I watch out for?"

What it can look up

Tool	What it answers
airport_costs	One airport: per-day price for the car alone, with a second driver, with full cover, automatic and no-deposit; by pick-up month; deposits; debit cards; desk hours and late-pick-up fees
compare_airports	Airports ranked by real cost, deposit, debit-card friendliness or late desks
supplier_terms	Each supplier at an airport: price, second-driver fee, cover, deposit, debit card, desk reviews
build_search_link	Your live search, dates and choices filled in, ready to book
list_airports, get_capabilities	What we cover and how fresh it is

Honest limits

The figures are measured - medians from our own repeated searches, each with its date - not a live quote for your exact dates. Live prices run in your own browser through the search link, where you book on DiscoverCars. The assistant never books or pays for you. It is read-only, needs no account, and we receive no personal information from your chat. If you book through the link we earn a commission; you pay the same price.

Developers: the same tools answer as JSON at app.carrentalbrain.com/api/v1/…, and llms.txt describes them for AI crawlers. Questions: hello@carrentalbrain.com.