Unfortunately we do not have a limited API Token or trial offered at this time. However you can use these URL’s to get limited years, makes, models and trims.
Get makes for years 2012-2021
And so on up to 2021
Get Models by year and make
Get Trims for year, make, models
And so on.
Get Transmissions for year, make, model, & trims
https://vehapi.com/vehicle/transmissions/2012/Chevrolet/Camaro/ZL1 Coupe RWD
Get Engines for year, make, model, trim, & transmission
https://vehapi.com/vehicle/engines/2012/Chevrolet/Camaro/ZL1 Coupe RWD/6-Speed Manual
These are good for years 2012-2021 only. Any other years will give you an API access error. Online documentation can be found here: API Documentation