MarketCheck Cars API vs Autotrader (Cox Automotive) for AI agents
MarketCheck Cars API is a paid REST API of new, used and certified car listings collected from dealer and other source websites, plus dealer, VIN and market-statistics endpoints. Cox Automotive runs an integration platform for partners, dealers and lenders; no public listings or inventory search API for outside developers was found on its pages.
The short answer
- MarketCheck Cars API: Searching current US dealer inventory at scale with price, mileage, photos and a link back to the dealer's listing page.
- Autotrader (Cox Automotive): Dealers and lenders already working with Cox Automotive products.
Side by side
| MarketCheck Cars API | Autotrader (Cox Automotive) | |
|---|---|---|
| Searches | Active new, used and certified dealer listings in the US, recent dealer inventory (last 90 days) in the US and Canada, private-party and auction listings, and dealers by location. | – |
| Returns | Listing records with price, miles, seller name, seller type, photo URLs and a link to the original vehicle details page, plus specs and dealer details. | – |
| Before the first call | A MarketCheck developer account and API key from the Developers Portal. | A business relationship with Cox Automotive (dealer, lender or integration partner); access goes through contact forms and partner login. |
| Free | Free plan at $0 a month with 500 calls a month and a 100-mile search radius limit. | – |
| Paid | Basic plan $299 a month plus per-call data fees (inventory search is $0.002 a call). | – |
| Acting on a result | Each listing carries the seller name and a link (vdp_url) to the vehicle details page on the source site; no dealer phone field is defined in the data definitions. | – |
| Limits on keeping or showing results | No caching, storing, indexing or persisting of substantial portions of the data; no independent or persistent datasets outside the service. | – |
| AI in its terms | Data may not be used to train, fine-tune or improve generalized ML or AI models, but may be used inside AI applications when accessed in real time. | – |
| Coverage | United States for active inventory search; US and Canada for recent dealer, private-party and auction inventory; the MCP docs also list the UK. | United States. |
| MCP server | Official hosted MCP server at https://api.marketcheck.com/mcp?api_key=YOUR_API_KEY (needs an API key; covers US, Canada and UK). | – |
Where Openpath fits
Openpath has no car listings yet. Cars are on its roadmap, from sellers and dealers who list them themselves. Get listed.
Questions people ask
What do I need before I can use MarketCheck Cars API?
A MarketCheck developer account and API key from the Developers Portal.
Is MarketCheck Cars API free?
Free plan at $0 a month with 500 calls a month and a 100-mile search radius limit.
Sources
Every line about another company comes from its own pages. Prices and terms change, so check the source before you rely on one.
MarketCheck Cars API, read on October 15, 2026:
- marketcheck.com/apis/pricing: “$0 /mo ... 500 calls per month”
- marketcheck.com/apis/pricing: “100 mile radius restriction”
- marketcheck.com/apis/pricing: “$299 /mo + data fee”
- marketcheck.com/apis/pricing: “$0.002”
- marketcheck.com/apis/cars: “Lookup New / Used / Certified cars for sale in US”
- marketcheck.com/apis/cars: “New / Used dealer cars for sale in US & Canada from last 90 days”
- docs.marketcheck.com/docs/guides/data/cars/inventory/data-definitions: “The URL of the Vehicle Details Page (VDP)”
- docs.marketcheck.com/docs/guides/data/cars/inventory/data-definitions: “The name of the dealership or seller, as displayed on the source website.”
- docs.marketcheck.com/docs/guides/data/cars/inventory/data-definitions: “The name of the source website from which the vehicle listing was scraped.”
- docs.marketcheck.com/docs/get-started/api/mcp/getting-started.md: “https://api.marketcheck.com/mcp?api_key=YOUR_API_KEY”
- marketcheck.com/terms_of_service: “Cache, store, index, or otherwise persist substantial portions of data obtained through the Service”
- marketcheck.com/terms_of_service: “Use MarketCheck data to train, fine-tune, or improve any generalized machine learning or artificial intelligence models”
- marketcheck.com/terms_of_service: “You may use MarketCheck data within applications that utilize AI models, provided the data is accessed in real time”
Autotrader (Cox Automotive), read on October 15, 2026:
- b2b.autotrader.com/integrations-cox-automotive-products: “Let's talk about Autotrader + Cox Automotive Integrations”
- coxautoinc.com/solutions/digital-retailing-apis: “Cox Automotive APIs empower you to seamlessly turn casual browsers into contract-ready buyers for your dealer partners.”