--- title: "Uptime Monitoring API — REST access to site, SSL and SEO data" description: "Lemwatch monitoring API: one REST endpoint for uptime, response time, SSL and incident data, plus a POST to trigger a check. Bearer key auth, 100 requests/hour." canonical: "https://lemwatch.com/api-docs" source: "https://lemwatch.com" --- # Website monitoring API > One REST endpoint for uptime, response time, SSL and incident data on any site you monitor, plus a POST call that runs a fresh check on demand. ## Authentication Every request carries an API key as a bearer token in the Authorization header. Keys are generated in Settings → API Keys inside your account, shown once, and stored hashed. The default limit is 100 requests per hour per key, and exceeding it returns 429. ## What the GET endpoint returns - Current up/down state and the last HTTP status code - Uptime percentage over 24 hours, 7 days and 30 days - Response time history and the current health score - SSL certificate validity, issuer and expiry - Open and recent incidents for the site ## Triggering a check A POST with action: run_check and a site id runs every configured check immediately and returns as soon as the run is queued. Useful straight after a deploy, or from a scheduled job in Zapier, Make or n8n. ## Error codes 400 for bad parameters, 401 for a missing or invalid key, 403 when the key lacks permission, 404 for an unknown resource, 429 when the rate limit is hit, 500 for a server error. ## Prefer an AI assistant to the API? The [Lemwatch MCP server](https://lemwatch.com/mcp) exposes the same data to Claude, ChatGPT and Cursor with no code at all. ## Lemwatch at a glance - What it is: website monitoring that checks uptime, page changes, SEO, security, SSL and speed in one tool. - Free plan: 10 sites, no time limit, all check types. - Pro: $19/mo, 50 sites, public API and webhooks. - Agency: $59/mo, 150 sites, white-label status pages. - Source: https://lemwatch.com/pricing (facts verified from the product's own plan limits). ## Related - [Lemwatch MCP server](https://lemwatch.com/mcp) - [API endpoints help article](https://lemwatch.com/help/api-endpoints) - [Lemwatch pricing](https://lemwatch.com/pricing) - [All monitoring checks](https://lemwatch.com/features)