For ChatGPT, Claude and other AI assistants
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
- On claude.ai, open Settings → Connectors → Add custom connector.
- Name it Car Rental Brain, paste the address above, and leave authentication empty.
- In a chat, switch it on from the tools menu, then just ask.
Add it to ChatGPT
- Open Settings → Apps & Connectors → Advanced and turn on Developer mode.
- Create an app: name Car Rental Brain, paste the address above, authentication None.
- In a new chat, start with "Using Car Rental Brain, …".
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.