Developers rent API docs, monitoring, secrets and webhook plumbing by the month for side projects that earn nothing yet. Self-hosted pay-once utilities cost less than one month of the SaaS they replace.
The tool this job usually means renting is Statuspage.io, at $29+/mo — roughly $348 a year, every year. Upkeep Status does the job for a one-time $29 — running on infrastructure you control.