# MarketCheck Developer Portal

> MarketCheck is an automotive data platform. The developer portal at
> developers.marketcheck.com is where developers sign up for API keys,
> manage billing and usage, and connect AI assistants to MarketCheck data
> over the Model Context Protocol (MCP). Coverage spans 40M+ active vehicle
> listings across cars, recreational vehicles, motorcycles, and heavy
> equipment, plus VIN decoding, price prediction, and sold-market history.

The REST API documentation lives at apidocs.marketcheck.com. This portal
covers account, plans, keys, and the MCP integration. AI assistants can
connect to the hosted MCP server with no install using OAuth, or run a
local stdio proxy (@marketcheck/mcp-client) for IDE agents.

## Core pages
- [Developer portal home](https://developers.marketcheck.com/): Product overview, pricing, and sign-up.
- [MCP overview](https://developers.marketcheck.com/mcp): What the MarketCheck MCP server is, the tools it exposes, and how to connect Claude, ChatGPT, Cursor, and other agents.
- [Sign up](https://developers.marketcheck.com/sign-up): Create a free account and get an API key.

## MCP server
- Endpoint: https://developers.marketcheck.com/api/mcp (Streamable HTTP, OAuth 2.1 + PKCE).
- Connect from an AI assistant by adding the endpoint as a custom connector and granting access through the OAuth consent screen. Per-tool scopes are managed per API key in the portal.
- Local proxy for IDE agents: the npm package @marketcheck/mcp-client bridges stdio clients to the API using an API key.

### MCP tools (US)
- search_active_cars: Vehicle listings search across 40M+ active inventory with 100+ filters.
- search_past_90_days: Recently sold or expired dealer listings from the last 90 days, with inferred sold counts, median prices, and days-to-sell aggregates.
- predict_price_with_comparables: AI price prediction with the comparable listings used to derive it.
- get_car_history: Complete listing history by VIN, including price changes, ownership, and days on market.
- decode_vin_neovin: Full VIN specs, options, packages, and trim data via NeoVIN.
- get_server_info: Server metadata and the tool catalog (used by clients for introspection).

### MCP tools (UK)
- search_uk_active_cars: UK live listings search across active dealer inventory.
- search_uk_recent_cars: UK recently sold or expired listings.

## Plans
- Starter: Free. Entry tier for evaluation and low-volume use.
- Growth: 749 USD per month.
- Scale: 1499 USD per month.
- Enterprise: Custom pricing. Contact sales for high-volume and custom terms.
- Per-endpoint rate cards cover Cars, Recreational Vehicles, Motorcycles, and Heavy Equipment. See the portal home for current pricing.

## Legal
- [Terms of Service](https://developers.marketcheck.com/terms)
- [Privacy Policy](https://developers.marketcheck.com/privacy)

## Contact
- Sales and support: through the portal, or the contact options on the home page.