You might want to just put a signup on it, charge monthly per X number of PDF's/questions (whatever combo nets you cash flow after your service charges, etc.),

You might want to just put a signup on it, charge monthly per X number of PDF's/questions (whatever combo nets you cash flow after your service charges, etc.), have different plans, take their CC info and charge them at the end of a 30 day free trial. Your price point of $2 is going to bring abusers of the service and if you have something promising your best bet is to go after smaller document based professionals (i.e. 1-4 person law firms) that want to speed up their processing/knowledge of documents but also don't know anything about ChatGPT, etc. They would likely give it a try and not think twice about a signup + credit card info if they think it will help them reduce costs.