Lock and unlock vehicles and get data like odometer reading and location. Works on most new cars.
Smartcar API is a free Vehicle API that requires OAuth authentication, is served over HTTPS and supports CORS, so it can be called from the browser.
Welcome to Smartcar's Developer Documentation! Here, you'll learn how to integrate your application with over 40 OEM brands, securely connect to vehicles, and receive the dynamic vehicle data you need, delivered directly to your systems.
Details from smartcar.com.

Unified API suite · now live
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The Smartcar API is provided by smartcar (smartcar.com). Welcome to Smartcar's Developer Documentation! Here, you'll learn how to integrate your application with over 40 OEM brands, securely connect to vehicles, and receive the dynamic vehicle data you need, delivered directly to your systems.
Yes. The Smartcar API is listed in the Vehicle category of the public-apis directory, which only includes APIs that are free or have a free tier. Check its documentation for rate limits and paid plans.
Yes. The Smartcar API uses OAuth authentication, so you need to register for credentials before making requests.
Yes. The Smartcar API supports CORS, so front-end JavaScript can call it directly.
Yes. The Smartcar API is served over HTTPS, so it's safe to use in production.