I can’t find it in their docs but they stated it in the announcement email for pay-as-you-go.
I also have received a email saying they covered my ~$0.18 bill for the month.
You could probably contact support for more clarification.
EDIT: Originally I just looked at the website. Looking at the GitHub repo, I see it's a fork, which makes sense (I also didn't notice the other replies!) Either way, it's cool. I'll probably end up using this myself. I was unable to find a way to store notes in a folder or in encrypted Gists though.
This seems nearly identical to Heynote[0], which was also on HN[1]. Even the example blocks share some content with that used as an example in the screenshot on the Heynote homepage (and I think in the app too)
What note-taking app are you using currently, if any?
I've been using Silverbullet [1] for a while now and love it due to it's usage of plain-text markdown files in a normal directory structure to actually store the notes. Yet, it supports many other features such as query language and to a certain extent, federation with other SilverBullet instances. The only major downside for me is that whilst it's usable on mobile, it feels cramped.
Open-sourcing the code allows some level of assurance that your data is not being used for profit and that if the hosted version goes away, it can still be used as a self-hosted service.
In addition, it can allow the devs to accept contributions, making their job maintaining the program easier.
I found this interesting as it has gained a significant amount of GitHub stars in a short period of time. From a brief look at the code, it seems it just makes requests to chat.openai.com as if someone was using ChatGPT, for free, via the browser. This somehow automates it, and seemingly, without credentials.
EDIT: I didn't realize that ChatGPT can now be used without a login. That seems to be how this can function without credentials.