# Guides

DealScore has six guides for agents that call score_deal: a fair-price check, a comparison of car price APIs, DealScore vs KBB vs CarGurus, how grades work, scoring by VIN, and connecting an agent over MCP.

Page: https://cardealscore.com/guides

## Pages

- [Is this car a good deal?](https://cardealscore.com/guides/is-this-car-a-good-deal). A fair asking price sits inside the expected band. Ask Claude or ChatGPT to call score_deal.
- [Car price and deal APIs for AI agents](https://cardealscore.com/guides/car-pricing-apis-for-ai-agents). Six car price, VIN, and deal APIs compared on returns, MCP, auth, and free tier, with sources.
- [DealScore grade vs KBB value vs CarGurus Deal Rating](https://cardealscore.com/guides/deal-score-vs-kbb-vs-cargurus). What each measures, its inputs and output, who it is for, and how an agent gets it, from each company's own pages.
- [How grades work](https://cardealscore.com/guides/how-deal-grades-work). score_v2 maps delta_pct to Great, Good, Fair, High, or Overpriced.
- [Score by VIN](https://cardealscore.com/guides/vin-deal-score). Send a 17-character VIN. NHTSA decode fills year, make, model, and trim.
- [Score with an agent](https://cardealscore.com/guides/score-a-car-deal-with-an-agent). Connect MCP with OAuth and call score_deal.

## Quick answers

### Which guide covers whether an asking price is fair?

Is this car a good deal? A fair asking price sits inside the expected band, and the guide shows how to have Claude or ChatGPT call score_deal.

### Which guide explains the grades?

How grades work. score_v2 maps delta_pct to Great, Good, Fair, High, or Overpriced.

### How does an agent connect to DealScore?

Score with an agent covers it. Add https://cardealscore.com/api/mcp as an MCP server, sign in with OAuth, and call score_deal.

### Can an agent score a car by VIN?

Yes, Score by VIN covers it. Send a 17-character VIN with the asking price and mileage. NHTSA decode fills year, make, model, and trim.

### Which guides compare DealScore with other products?

Car price and deal APIs for AI agents compares six APIs on what they return, MCP, auth, and free tier, with sources. DealScore grade vs KBB value vs CarGurus Deal Rating covers what each one measures, from each company's own pages.