DealScore grade vs KBB value vs CarGurus Deal Rating

DealScore grade

• How one listing's asking price compares with an expected price built from comparable US dealer listings. delta_pct is (asking_price minus expected_price) divided by expected_price, and the grade comes from delta_pct alone. (source: DealScore used car price API, How DealScore grades work)
• A private-party price is judged against dealer prices for comparable cars. (source: DealScore used car price API)

Kelley Blue Book Fair Market Range and Fair Purchase Price

• The used-car Fair Market Range is KBB's estimate of what a consumer can reasonably expect to pay this week in their area for a year, make, and model, when buying from a dealer, excluding taxes, title and fees. (source: KBB: Definitions of our values)
• KBB also publishes separate values for selling: the Trade In Range for trading in at a dealer and the Private Party Value for selling to an individual. (source: KBB: What's my car worth)

CarGurus Deal Rating and Instant Market Value (IMV)

• A Deal Rating shows how a listed price compares with CarGurus' estimated market value for similar vehicles, the Instant Market Value (IMV). (source: CarGurus: How CarGurus works, CarGurus Help: What is IMV?)
• CarGurus says a Deal Rating reflects price competitiveness only. It is not a certification of condition, reliability, safety, title, accident history, or service quality, and it leaves out taxes, registration, and government fees. (source: CarGurus: How CarGurus works)

DealScore grade

• asking_price and mileage, plus a VIN or year, make, and model. trim and zip are optional. (source: Connect DealScore to an agent, DealScore API reference)

Kelley Blue Book Fair Market Range and Fair Purchase Price

• Year, make, and model, with typical miles and options or the miles and options the user specifies. kbb.com also accepts a license plate or a VIN. (source: KBB: Definitions of our values, KBB: Car values, KBB: What's my car worth)
• KBB lists its data sources for the range as dealership retail sales transactions, auction sales transactions, economic data, consumer search analytics, online vehicle listings, trade-in marketplace offers, and dealership appraisals. (source: KBB: Definitions of our values)

CarGurus Deal Rating and Instant Market Value (IMV)

• IMV comes from comparable vehicle listings and vehicle, listing, and local-market information. That may include make, model, year, trim, mileage, options, location, seller type, vehicle history, and other listing details. (source: CarGurus: How CarGurus works)
• The CarGurus car valuation tool takes a license plate or VIN, or make, model, year, and mileage. (source: CarGurus: Car valuation)

DealScore grade

• JSON with grade (Great, Good, Fair, High, or Overpriced, or null when it cannot score), score (0 to 100), expected_price with expected_price_low and expected_price_high, delta_pct, confidence, and coverage (scored, partial, or cannot_score). (source: DealScore used car price API, How DealScore grades work)

Kelley Blue Book Fair Market Range and Fair Purchase Price

• A dollar range (the Fair Market Range), shown in the KBB Price Advisor, plus the Fair Purchase Price, which is generally the midpoint of the range. (source: KBB: Vehicle values FAQ, KBB: Definitions of our values)
• Values are updated weekly and reflect local conditions in over 100 regions. (source: KBB: Definitions of our values, KBB: What's my car worth)

CarGurus Deal Rating and Instant Market Value (IMV)

• A badge on the listing: Great Deal, Good Deal, Fair Deal, High Price, or Overpriced, or No Deal Rating when there is not enough reliable, comparable, or complete information. (source: CarGurus: How CarGurus works)
• IMV is updated daily. Deal Ratings change when price, vehicle details, or market data change, and are not updated second by second. (source: CarGurus Help: What is IMV?, CarGurus: How CarGurus works)

DealScore grade

• AI agents and the developers who connect them, scoring a listing the user already has. (source: Connect DealScore to an agent)

Kelley Blue Book Fair Market Range and Fair Purchase Price

• Consumers buying or selling a car on kbb.com, and businesses that put KBB values into their own website, mobile app, or loan origination platform. (source: KBB: What's my car worth, KBB: InfoDriver Web Service (IDWS))

CarGurus Deal Rating and Instant Market Value (IMV)

• Car shoppers browsing inventory from participating franchise and independent dealers on CarGurus. CarGurus does not host private-party listings, and browsing is free for buyers. (source: CarGurus: How CarGurus works)

DealScore grade

• MCP at https://cardealscore.com/api/mcp with the tools score_deal, explain_grade, and health, using OAuth or an API key. REST is POST /api/score with an API key. (source: Connect DealScore to an agent, DealScore API reference)
• Free covers 5 scored calls a month. (source: DealScore pricing)

Kelley Blue Book Fair Market Range and Fair Purchase Price

• InfoDriver Web Service (IDWS), a REST-compatible service with VIN decode and documentation on a developer portal. Its values include the Used Car Fair Market Range, Fair Purchase Price, Private Party Value and Range, and Trade-in Value and Range. (source: KBB: InfoDriver Web Service (IDWS))

CarGurus Deal Rating and Instant Market Value (IMV)

• A CarGurus MCP connector in the Claude connector directory and the ChatGPT plugin store. It searches US vehicle listings and retrieves vehicle details, is read-only, needs no CarGurus login, and returns up to 20 listings per search. (source: CarGurus Help: Connect AI assistants with the MCP connector)

To get a DealScore grade from an agent, connect the MCP server or create an API key. Free covers 5 scored calls a month.