# Used Car Health Check

> Vet a used car before you buy: spec, history, price changes, red flags.

**Price:** $1.49 per report. Runs inside Claude or ChatGPT (MCP), or as a shareable hosted web report. Pay per report, no subscription.

Vets a used car before purchase: full spec sheet, listing history, price changes, dealer churn, mileage progression, and computed red flags. Returns a GREEN/YELLOW/RED verdict. Use when a CONSUMER is considering buying ONE specific used vehicle (by VIN) and wants it vetted: is the asking price fair, listing-history flags, red/green signals. For the value alone use Vehicle Valuation; for negotiation talking points use Negotiation Brief.

## Inputs

### Required
- **vin** (e.g. `4T1B11HK0KU000999`): 17-character vehicle identification number.

### Recommended
- **listed_price_usd** (e.g. `18500`): Current asking price on the listing the user is considering. Lets us frame asking vs market value alongside the health check.
- **zip** (e.g. `60601`): ZIP code where the user is shopping. Improves the market-value-for-context section.

### Optional
- **miles** (e.g. `64000`): Actual odometer reading. When omitted, the report anchors the value on the most recent odometer in the listing history. Provide it to override a stale listing reading and value the car at its true mileage.

## Data semantics

Every price is a **listed (asking) price**, not a transacted sale price. "Recently off-market" comps show a vehicle's last list price (a sold proxy). The ML "MarketCheck Price" predicts an optimal listing price, not a sale price.

## How to run

Connect MarketCheck to Claude or ChatGPT at https://ai.marketcheck.com/install, then ask in plain English. Or open the report page and run it.

[Open the Used Car Health Check](https://ai.marketcheck.com/reports/used-car-health-check) · [All reports](https://ai.marketcheck.com/) · [llms.txt](https://ai.marketcheck.com/llms.txt)