Liveness probe

Plain-text liveness check. Returns HTTP 200 with the body ok when the API process is serving. Keyless, unrated, and intentionally trivial — poll it as often as your monitoring needs.

It answers exactly one question: is the process up. It does NOT assert that the database is reachable, that ingestion is current, or that any venue is fresh. Deep checks are deliberately localhost-only, because exposing dependency topology publicly is a gift to an attacker.

For DATA freshness rather than process liveness, poll /api/prediction-markets/sources/health, which reports per-venue ingest lag, freshness tier against a published SLO, and degraded flags.

NOTE: CoinRithm publishes no uptime SLA today, and this endpoint is not one. See the repository's status notes for why an SLA has not been offered yet.