PAYG AI chat

AI chat tech is the current thing and there's profit in the subscription model where people pay $20+/month for a service they underutilize.

The models are generally available, but they are gate-kept. Is there an example outside of BTC where micropayments for AI are utilized for pay as you go AI chat?

There are a few examples using BTC for PAYG, but Jack Dorsey is promoting https://routstr.com, for example.