Inside the Web Infrastructure of Dynamic Pricing

Every price you see online is increasingly the output of a real-time engine that reads your device, your behavior, and your history to calculate the maximum you'll pay. New York's 2025 disclosure law forced this into the open, an Instacart investigation caught 23% price swings on identical groceries, and the same cloud backends are now powering physical shelf labels at Walmart and Kroger. The fixed price is dead. What replaced it is a per-user negotiation you never agreed to.