Can we not charge for access? If I have a link, that says "By clicking this link you agree to pay $10 for each access" then sending the bill?

Cloudflare launched a product to do that last year: https://blog.cloudflare.com/introducing-pay-per-crawl/

I have no idea if it actually works as advertised though. I don't think I've heard from anyone trying it.

Send it where?