Hey, thanks for the question!

So, the server that runs the website also fetches the data on demand, which it then caches for up to 1 minute in order to not get denied with 429 Too Many Requests. That was the optimal balance between freshness and stability in my tests.

I'm using a cheap server provider for now, so my server costs amount to around $5/month. I expect that to (hopefully) scale up, but for now it works without issues.