Bulk Check Domains - Lightweight Asynchronous - Web App

Lightweight asynchronous web APP: Part1. Bulk-check lists of up to 100,00 domains using - We can upload CSVs, TXTS (containing up to 100k names) or paste domain lists into a simple form. - Using "API" (as researched and suggested by you) we will need accurate results returned of all domains that have expired and no longer in use (eg: available to register) - Method can include an API if required (we can pay) - Setup hosting server (suggested by you) to run fast checks on a regular basis. *Result specifics. - Must be able to provide results for 50k names in around 30 secs. - Must only return available (expired/not registered) .com or .[login to view URL] - Only return domains available with 12 characters or less - Only return domains with characters (no numbers or hyphens). *If an API subscription is required - we would pay for the monthly fee. *If a server is required - we will pay for the subscriptions. (this is just the first stage of the project. it is going to be a longer more extensive system. So we would like someone who is familiar with Python, Apis, and Heroku servers.)