Allowing thirdparty access

I currently have my app for car rentals. and a thirdparty website wants to access my cars and display on his website. whats the best way for creating an api that will handle high traffic just like inbuilt appwrite library

TL;DR

Developer has a car rental app and wants to create an API for a third-party website to access car data. The solution is to create a high-traffic API similar to the inbuilt Appwrite library.