Get Details on a Specific Car Make: Same as the first endpoint but this one returns relevant information for a specific car make. The information can also be narrowed down with filters.
Get Total Count of Car Makes: Get the total number of car makes.
Get A List of Makes: Returns a list of makes based on filters.
These three endpoints provide all the necessary data.
http://api.edmunds.com/api/vehicle/v3/honda?state=USED&api_key={vehicle api key}
http://api.edmunds.com/api/vehicle/v3/makes/count?api_key={vehicle api key}
http://api.edmunds.com/api/vehicle/v3/makes?api_key={vehicle api key}&publicationStates=NEW_USED