is there something wrong with the API right now?

tldr I made a script a while ago to rename my local files using post data.

It's not working and tbh I'm not a great programmer so I'm wondering if the API isn't working or if something changed. I haven't made any code changes since it last functioned.

My gelbooru script also doesn't work right now.

"It doesn't work" doesn't tell us much about why it's not working. Make sure you're sending a unique user-agent and not using whatever your HTTP client's built-in one is, don't pretend to be a browser, and follow rate limits. The API itself hasn't been changed and should be working fine as long as the site is up.