ContractWatch snapshots your REST or MCP contracts on a schedule and diffs them against yesterday. When something breaking slips in, you hear about it in Slack — before your users file the ticket.
Any client still sending customer_id alone will start receiving 400s.
Point it at an OpenAPI spec or an MCP server. Same diff engine, same alerts.
See the exact field, type, or tool signature that changed — not just “something broke.”
Slack, email, or a webhook into your own system. No dashboard you have to remember to check.
2 monitors, daily checks, email alerts — no credit card required. Upgrade when you outgrow it.