Catch API degradation before it becomes an outage
NotiLens monitors API error rates, latency trends, throughput silence, and broken webhook flows — alerting you when performance degrades, errors spike, or traffic disappears entirely.
API failures don't always look like failures
A 5% error rate. A 200ms latency increase. A gradual throughput drop. These are the degradation patterns that slip through threshold-based monitoring and compound into real incidents.
API latency spiked silently
Your checkout endpoint's p95 latency drifted from 180ms to 1,400ms over 90 minutes. No single response crossed your timeout threshold. But conversion rate dropped 30% before anyone noticed.
Endpoint returning errors silently
A schema migration caused POST /orders to return 422s for specific request shapes. 15% of orders were failing. Your uptime monitor showed 100% — because it only checks GET /health.
Traffic disappeared overnight
Your API received zero requests for 34 minutes. No one noticed because it was 3am. But your SLA required 99.9% uptime — and that silence counted against it whether or not anyone was watching.
Monitoring that understands API behavior
NotiLens goes beyond simple uptime checks — it watches your API's behavioral patterns and alerts on trends, anomalies, and silence.
API error rate detection
NotiLens tracks error counts per endpoint and computes a rolling baseline. Get alerted the moment a specific endpoint's error rate exceeds its normal pattern — not just a global threshold.
Latency trend monitoring
Send response time events per request. NotiLens spots when latency is trending up and can flag gradual drift before it compounds into a user-facing slowdown that threshold alerts miss entirely.
Throughput silence alerts
Define a minimum expected request volume per window. If traffic drops to zero or below your threshold, NotiLens alerts you before the silence triggers an SLA breach or goes unnoticed until morning.
Broken webhook flow detection
Define two-step flows like webhook.received → order.acknowledged. If the second event never fires in your window, NotiLens alerts you — before a silent drop in your event processing pipeline causes data loss.
Metric drift detection
Launched May 2026, drift detection catches gradual baseline shifts over time — like response times that creep up 50ms every day. These are invisible to threshold-based alerts but compound into real user-facing slowdowns.
Acknowledgement (ACK)
Critical error rate alerts repeat every 5 minutes until someone on your team acknowledges them. A checkout endpoint failing at 3am won't go unnoticed until your support queue explodes at 9am.
What NotiLens sends your team
Endpoint-specific alerts with baselines and context — so you know exactly where to look and what to expect when you get there.
Zero traffic is not the same as healthy traffic.
When your API goes quiet, traditional uptime monitors don't fire — because the endpoint is still responding. NotiLens detects when expected traffic disappears and alerts you immediately, regardless of what your health check returns.
Monitor every API endpoint that matters
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