API for Developers

The OTDCheck API is a RESTful automotive data service that gives developers programmatic access to VIN-level market intelligence. Every response is structured JSON, so you can drop it straight into your app, dashboard, or data pipeline without parsing HTML or scraping third-party sites. The API covers four core data domains: price history (how a listing's asking price has changed over time), recall status (open NHTSA recalls cross-referenced by VIN), dealer behavior scoring (days-on-lot patterns, price-drop frequency, and negotiation tendencies), and market pulse signals (aggregate trends across makes, models, and regions).

If you have ever tried to answer the question “Is this car priced fairly?” at scale, you know how fragmented automotive data can be. Listings appear and vanish from marketplaces daily, recall databases are maintained by a separate federal agency, and dealer behavior is almost never quantified. OTDCheck consolidates those signals behind a single API key. You can look up a single VIN with our VIN lookup tool on the web, or call the same endpoint programmatically to enrich thousands of records in a batch job.

The API is built on the same dataset that powers our consumer-facing tools, including the recall checker and dealer scorecard. Check out our guide on how to use VIN price history to negotiate a better deal for a practical walkthrough.