Car Rental Brain
Compare real car rental costs at 120+ airports including fees, deposits, and debit card policies.
Shows the true cost of car hire at major airports worldwide: base price, second driver fees, insurance, deposits, debit card acceptance, and desk hours. Compares suppliers and airports to find the cheapest option for your dates and needs.
Try asking Muse: "What's the cheapest airport to rent a car in Spain next March, and how much will a second driver add?"
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Source: Found in the official MCP Registry (com.carrentalbrain/car-rental-brain) · First listed October 29, 2026
Last 24 hours
Each bar is one check, every 15 minutes. Green means it answered. Last checked 2 h ago.
Is it safe to connect?
What Muse can see: It does not ask you to sign in, so it cannot see your accounts. It only sees what Muse sends it from your request.
Before it acts: Read what Muse plans to do before you approve it, and remove the app from Muse when you stop using it.
musedirectory.ai is not part of Meta. More about how Muse handles your information
How to add it to Muse
Not in Muse's Connectors list yet, but Muse can still use it. Copy the request below and paste it into Muse. Muse asks before it shares anything with the app's site. Meta does not review apps used this way, so only use ones you trust. We tested this in the Muse app on September 24, 2026: Muse used an app's link directly this way and returned a live answer.
https://app.carrentalbrain.com/mcpNot in Muse's Connectors list yet. Muse can still use it: its page gives you a request to paste into Muse.
Also use it in ChatGPT or Claude
Car Rental Brain is a remote MCP server, so any assistant that can add a custom connector by link can use it. Same link, same tools.
Add it to ChatGPT
- 1
Open ChatGPT settings
In ChatGPT, open Settings, then Connectors (called Apps & Connectors on some accounts).
- 2
Turn on developer mode
Under Advanced settings, switch on Developer mode. That is what lets you add a connector by link.
- 3
Create the connector
Choose Create, give it a name, paste the link as the MCP server URL, and save. If it needs a sign-in, ChatGPT asks for it here.
- 4
Use it in a chat
Start a chat, open the tools menu, pick the connector, and ask. ChatGPT asks before it runs a tool the first time.
Custom connectors need a paid ChatGPT plan, and on Team, Enterprise and Edu accounts only an admin can add them. Our "Working" label means the server answered us; it cannot tell whether your plan lets you add it. All connectors that work in ChatGPT
Add it to Claude
- 1
Open Claude settings
In Claude, open Settings, then Connectors.
- 2
Add a custom connector
Choose Add custom connector, give it a name, and paste the link.
- 3
Connect and use it
If it needs a sign-in, Claude sends you to it. Then turn the connector on in a chat from the tools menu and ask.
Custom connectors are available on paid Claude plans; on Team and Enterprise accounts an admin may need to add them. Our "Working" label means the server answered us; it cannot tell whether your plan lets you add it. All connectors that work in Claude
https://app.carrentalbrain.com/mcpWhat people ask Muse to do
Technical details: safety screening, tools, response time and recent checks
Response time at the last check: 543ms. Worked in n/a of checks over 30 days.
Screening · October 29, 2026
Screened, no issues found
Screening looks for known threats and hidden instructions at the time of the check, and runs again weekly and whenever the tool list changes. It cannot see the server's code, so only connect what you need and review what Muse asks to do. How screening works.
Tools · 6
get_capabilitiesWhat Car Rental Brain measures, how fresh it is, and which airports/countries are covered.list_airportsAirports we measure, with the typical rental price per day. Filter by country.airport_costsThe true cost of hiring a car at one airport: per-day price for the car alone, with a second driver, with full cover, automatic, no-deposit (from + typical); by pick-up month; second-driver fees; deposits; debit-card acceptance; desk closing times and out-of-hours fees; policies.compare_airportsRank airports by real cost (car only / with driver / with cover), typical deposit, debit-card friendliness or late desk hours. 'Where in Spain is car hire cheapest in March?'supplier_termsPer supplier at an airport: typical price per day, second-driver fee, full-cover price, deposit held, whether the desk takes a debit card, and customers' desk review scores.build_search_linkA link for the PERSON to open: live prices for their exact dates and needs, ranked by the total they will actually pay, where they can book. Always give this to the person.Link
https://app.carrentalbrain.com/mcpQuestions about Car Rental Brain in Muse
How do I connect Car Rental Brain to Muse?
Not in Muse's Connectors list yet, but Muse can still use it. Paste this into Muse: "Use Car Rental Brain to help me. It is a free service with an MCP server at https://app.carrentalbrain.com/mcp. It does not need an API key. Ask me before you share anything with it." Muse asks before it shares anything with the app's site. Meta does not review apps used this way, so only use ones you trust. We tested this in the Muse app on September 24, 2026: Muse used an app's link directly this way and returned a live answer.
Is Car Rental Brain working right now?
At the last check (October 29, 2026, 15:16 UTC) the endpoint was working, answering in 543ms. It is checked every 15 minutes.
Is Car Rental Brain safe to connect to Muse?
It was screened on October 29, 2026 with the result "screened, no issues found". Screening checks the domain against threat feeds and reads the tools for hidden instructions and requests for passwords or card numbers. It cannot see the server's code, so grant only the access you need.
What can Car Rental Brain do in Muse?
It exposes 6 tools, including get_capabilities, list_airports, airport_costs, compare_airports. For example, you could ask Muse: "What's the cheapest airport to rent a car in Spain next March, and how much will a second driver add?"
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This listing was added from public sources (Found in the official MCP Registry (com.carrentalbrain/car-rental-brain)). If you build Car Rental Brain, claim it to correct the details and get your badge.
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<a href="https://musedirectory.ai/connector/car-rental-brain"><img src="https://musedirectory.ai/badge/car-rental-brain.svg" alt="Car Rental Brain on musedirectory.ai" width="236" height="40"></a>