I built https://zebra.page/ during time off from work around the holidays. Stripe came out with payment links a few months later. Not exactly the same thing, but enough to dissuade from spending time marketing it.
This is great, thanks for the writeup! We are actually building something quite similar. We have a rough landing page up at hireross.com. Airbnb folks, I'd love to chat if you're up for it. Just to learn more. email is at the bottom of the landing page.