Email alerts
Scheduled monitors email the account owner when a check finds breaking or potentially-breaking changes. Delivery is retried up to three times.
Integrations
A plain inventory of what API Guard connects to today. Planned channels are labeled as planned; they are not presented as finished features.
Available now
Slack alerts Pro
Connect a Slack incoming webhook and API Guard posts a concise change summary after a scheduled monitor detects a notable change.
Signed JSON webhooks Pro
Send a structured api.change_detected payload to a public HTTPS endpoint. Each request includes an HMAC-SHA256 signature and is retried on network errors, HTTP 429 and server errors.
OpenAPI URL monitoring
Register a public HTTP or HTTPS OpenAPI 3.0/3.1 URL. Free and Pro re-fetch it daily; pasted specs use manual Check Now.
Polar billing
Polar hosts Pro checkout and acts as Merchant of Record. Cryonel receives signed subscription-state webhooks, not card details.
Browser tools
Validate or diff a spec locally before monitoring it. The free OpenAPI tools do not upload the spec to API Guard.
Not shipped yet
Discord, Microsoft Teams, GitHub pull-request checks, GitLab merge-request checks, CLI and CI/CD actions are not available today. They remain demand-gated so the product does not promise integrations it cannot deliver.
Start with the current workflow
Use the live diff demo, review the security model, then create a free account. The Free plan needs no card.