Schema-aware API monitoring that catches breaking changes before your users do.

website · blog · public-API changelog · free diff tool · Bluesky

monit.rs — the hosted monitor. Point it at your API endpoint and it learns the response schema by example, diffs every subsequent probe against the baseline, and alerts you the moment the contract drifts. Every alert ships with an AI-generated plain-English summary of what changed. 3 endpoints free forever, full feature set, no card required.

Open-source pieces of monit.rs live here:

GitHub Action that runs the same schema-aware diff engine as a step in your CI. On every PR that touches your OpenAPI spec, it comments a summary of breaking / non-breaking / info changes and fails the check when a breaking change is introduced (configurable).

- uses: Monitrs/openapi-diff-action@v1
  with:
    spec: openapi.yaml

Available on GitHub Marketplace →

• Live changelog of 28 public APIs — Stripe, GitHub, Vercel, Cloudflare, Supabase, OpenAI, and 22 more. Updated weekly. RSS available.
• Public regressions archive — real detected schema drift, anonymized before publication.
• Blog — data-driven writing about API stability and drift.

• Website: monit.rs
• Email: hello@monit.rs
• Support: support@monit.rs
• Bluesky: @monit.rs

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