Deal Score is a 0–100 assessment of the current price against confirmed recent and longer-term price history for the same listing and marketplace. It combines price hike, all-time low, average price, historical range and price stability checks. Sale mode also compares the previous sale price when recorded. Normal weights are 36% integrity, 22.5% all-time low, 18% average, 13.5% range and 10% stability. Sale weights are 36% integrity, 13.5% last sale, 18% all-time low, 13.5% average, 9% range and 10% stability. Stability looks back up to 7, 15 and 30 days at 50%, 30% and 20%, using available comparable history without waiting for complete periods. For seven days or less, up to two recorded changes earns 100 stability points; each extra change removes 10, down to zero. Longer histories use changes per seven observed days. Both increases and decreases count, while duplicate checks do not. Gaps and time after the latest quote are not assumed stable. Stability contributes at most 10%; available value checks share the other 90%, or 100% if stability is unavailable. Stability alone cannot publish a score. MRP, advertised discount, ratings, popularity and sponsored placement do not add score points.
Each check applies its own history requirements. A new all-time low earns 100; matching the recorded low earns 95. Average and range use the same eligible historical window, and a flat range is unavailable. Missing checks add no points. Confidence describes the available evidence and is separate from the score. Deal Score is neither a product-quality review nor a prediction of the next price.
