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A discount is real only if today's price beats what the item actually sold for over the last 12-24 months — and that check takes minutes.
Price-history trackers sample a listing every 1-6 hours and keep 12-24 months of results. That is long enough to cover several sale cycles, so the chart shows the level an item returns to between promotions — the only honest baseline a discount can be measured against.
The pattern the check exists to catch is the raised anchor: a list price lifted weeks before a '50% off' event, so the discounted price lands near the everyday one. On a history chart the trick is visible as a step up just before the promotion begins.
On narrow screens, swipe or scroll the plate sideways.
Read the chart against the typical selling price, not the peak. If today's offer sits at or below the level the item repeatedly returns to, the discount is genuine; if it only undercuts a recently inflated list price, the saving exists on paper only.
Timing is the second half of the check. Because trackers retain 12-24 months, the chart also shows how often the item is promoted; a listing discounted every few weeks will be discounted again, and waiting one cycle usually costs nothing.
When no history exists — a brand-new listing — the fallback is to compare delivered totals across shops, because shipping, taxes and fees decide the real price at the last screen. Once the baseline is confirmed, the stacking order on the companion page about codes, cashback and free shipping squeezes the total further, and the deadline guide keeps the result protected after payment.
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