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Margin alerts help you detect when profitability drops below acceptable thresholds. Margin floor: The can() endpoint can include a min_margin_percent field. When a customer’s margin drops below this threshold, you can take action — warn them, throttle usage, or adjust pricing. 
const check = await nozle.can('cust_123', 'api_calls');
if (check.margin_per_use_cents < 0) {
  // This customer is costing you money
  logger.alert('Negative margin detected', {
    customer: 'cust_123',
    margin: check.margin_per_use_cents,
    cost: check.cost_per_use_cents,
    revenue: check.revenue_per_use_cents,
  });
}
Using trend data for spike detection: 
const trend = await nozle.margin.trend({ granularity: 'hour' });
// Check for sudden margin drops in the last 24 hours
React-side usage alerts: The UsageAlert component shows warnings when usage approaches limits: 
<UsageAlert
  features={[
    { key: 'api_calls', label: 'API Calls', percentage: 92 },
    { key: 'tokens', label: 'Token Usage', percentage: 85 },
  ]}
  threshold={80}
  upgradeHref="/plans"
/>