Spot AWS cost anomalies before they wreck your budget

Quick take AWS bill spikes are almost never random. They follow four predictable signals: a service line that grew faster than your traffic, a region that was not in the plan, a usage type that was unused last month, and a percentage delta that crosses the 30% threshold. Catch all four early, and the next budget incident becomes a Slack notification, not a Monday-morning fire. If you only have 60 seconds, this is the shape: AWS Cost Anomaly Detection is free and a fine baseline, but it lags by 24 to 48 hours. Real-time anomaly detection is the 2026 standard, and several tools now ship with auto-remediation. The four signals to set up alerts on are service spike, region drift, usage-type creep, and percentage delta. Why cost anomalies hit harder in 2026 I get pulled into post-incident reviews where a single weekend cost the team $14,000 in surprise spend. The shape of these incidents has shifted twice in the last year. AI workloads create spiky bills. A