Your API Broke. Your Dashboard Still Says OK.
website issue monitoring
A 200 response can still violate the contract. Monitor public API endpoints with configurable requests, response assertions, timing, TLS evidence, and scheduled DNS history.
What Is API Monitoring?
API monitoring is scheduled testing of a public HTTP or HTTPS endpoint from outside the application. A useful check verifies an allowed status, records response time, and evaluates the response assertions that represent the contract. Visual Sentinel supports configurable methods, headers, request bodies, expected statuses, and API or GraphQL response assertions. Response-content monitoring requires Starter or higher. TLS trust and hostname authorization run with the uptime request, while DNS history follows a separate six-hour schedule. This is single-endpoint synthetic monitoring, not a private-network agent or scripted multi-step transaction runner. Business and Agency use 1-minute uptime checks from Europe and the United States; Solo and Starter use 5-minute checks. Paid alert-channel availability depends on the selected plan.
Built for issues
customers actually notice.
Response Time Tracking
Monitor TTFB and total response time with historical trends. Get alerted when your API slows down before users complain.
Checks as Fast as 1 Minute
Business checks your API every 60 seconds from Europe and the United States. Solo and Starter run every 5 minutes.
Content Validation
On Starter or higher, evaluate configured response rules or API and GraphQL assertions. The monitor only catches the contract conditions you define.
SSL & DNS Monitoring
Check TLS trust, hostname authorization, and expiry with the uptime request. Keep selected DNS record history on a separate six-hour schedule.
Response-Time Thresholds
Set a response-time threshold per monitor and review the recorded trend. Alerts reflect the threshold you configure, not an inferred baseline.
10 Alert Channels
Route API alerts to Slack, Discord, PagerDuty, OpsGenie, email, WhatsApp, Telegram, Teams, webhooks, or Prometheus.
Webhook Integration
Trigger automated responses when your API fails. Connect to your incident management workflow via custom webhooks.
Three steps,
no extensions.
Add Your API Endpoint
Enter a public API URL and configure the method, headers, request body, expected statuses, response-time threshold, and eligible assertions.
Configure Alert Channels
Choose the notification channels available on your plan and set the monitor sensitivity, delay, and repeat interval.
Monitor 24/7
Choose a 5-minute Solo or Starter cadence, or 1-minute Business checks from Europe and the United States.
Answers,
in plain English.
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Check Your API Free in
60 seconds.
start watching in 60 secondsFree plan available. Paid plans start at $6/mo.