Watch a developer community for the things you care about. On a schedule it searches Hacker News for your keywords inside a rolling window, has a model write a short digest with a structured shape, and sends it to Telegram — but only when there is something worth saying. Hacker News search needs no credentials, so the whole thing runs end to end before you own anything.
Grafana dashboard for Air Pipe managed hosted metrics: requests, failures and latency per config and interface, and series against your plan's limit. With a three-route demo API to fill it, and the scrape config for your own Prometheus.
Uptime monitoring where a Google Sheet is the whole database: the site list, the append-only log of every check, and the current up/down state. A schedule probes every site concurrently, logs the result, upserts the current status, and alerts only when something is actually down.