The code for Plavna Cron is quite short. It's more of a recipe for solving a problem than a library. The goal was to have a free cron-like requesting service that could make 10 times more requests per month than other cron services offer – execute requests even more often than once a minute.

The secret is Cloudflare – it allows you to create free minute-by-minute CRONs, and within each one, make several requests with a delay between them (using a simple await sleep) and the time between requests will not be counted as computer seconds used.

If this description is not enough for you and you are interested in the code, write to me on X/Twitter and I might will make it open source.