You can ask ChatGPT to write you a script that will find all matches in a folder and report their count to Beeminder using API.
For macOS/Linux you need to ask it for a Bash script, and if you’re on Windows you want Powershell.
Then you will need to find a program that can run a script every day. On macOS you can likely do it with the built-in Automator. No idea for other OSes unfortunately, but ChatGPT is actually better than Google at recommending software, in my experience.
If you haven’t done programming before, it will involve a bit of trial and error, but the good thing is that you can’t mess it up too much. Most likely you’ll just get wrong counts for the first version of the script and then you’ll ask ChatGPT to fix it and it’ll start working after a few iterations.