I did a related approach:

A toll charging gateway for llm scrapers: a modification to robots.txt to add price sheets in the comment field like a menu.

This was for a hackathon by forking certbot. Cloudflare has an enterprise version of this but this one would be self hosted

I think it has legs but I think I need to get pushed and goaded otherwise I tend to lose interest ...

It was for the USDC company btw so that's why there's a crypto angle - this might be a valid use case!

I'm open to crypto not all being hustles and scams

Tell me what you think?

https://github.com/kristopolous/tollbot

This is literally what HTTP 402 is for -- there's a whole buncha work going on ... but please, please, please don't let Cloudflare become another bloody gatekeeper. Please.