Free Website Uptime API - JSON for Developers and Automation

Published November 2025 by SiteInformant Team

Free Website Uptime API - JSON for Developers and Automation

SiteInformant provides a read-only public JSON API for monitors whose owners have enabled public visibility. It is designed for straightforward use in scripts, dashboards, reports, and internal tools.

What the API returns

Depending on the endpoint, public status data can include:

• Current online state
• Recent check time
• Uptime percentage
• Average response time
• SSL expiration date
• SSL issuer

No API key is required for public status data.

Public visibility is opt-in

A site appears through the public API only when its owner enables public status. Encrypted request headers and private account data are never included.

Common uses

Developers can:

• Add current status to an internal dashboard
• Generate a service-health report
• Feed an operational script
• Display uptime beside project documentation
• Combine JSON status with a public page or SVG badge

Status data versus monitor management

The public API reads opted-in status information. It does not create, edit, pause, or delete monitors. Those actions remain in the authenticated SiteInformant application.

See the Developers page for the current endpoints and OpenAPI document.

Try SiteInformant: Try It Free