How we record Back Market US prices
We record the public starting price visible for tracked refurbished iPhones on Back Market US. Each observation is stored with its timestamp, then used to calculate lows, averages, trends and price-position labels.
Traceable data, not price promises
How the figures on Price Radar are produced
The method separates what we observe, what we derive from it, and the claims we deliberately never make.
What is recorded
The publicly visible “from” price of the refurbished iPhone models we track on Back Market US — not every storage and grade combination separately.
What is computed
Current price, lowest, highest, average, trend and price position are computed only from stored readings, never from an external estimate.
What is never claimed
No forecast, no stock guarantee, no personal buying advice. The offer you open at the source remains the thing that decides.
What each figure on the site means
Current price is the last reading we stored for a model. It is the visible entry price at that moment, for the cheapest configuration on offer — usually the smallest storage and the most marked cosmetic grade. It is not the price of a specific unit, and it is not a quote.
Lowest recorded and highest recorded are the extremes of the readings we hold. They prove the market reached those amounts on given dates. They say nothing about whether either will happen again, and we never present them as a target.
Average price is the mean of stored readings over the tracked period. It smooths daily noise and gives a reference point; on a model tracked for only a few weeks it is a weak reference, which is why the number of readings is always shown next to it.
Price position places the current price between the lowest and the highest we have seen for that model. It is the figure behind the “low / usual / high” labels, and it is only computed when the series is long enough to mean something.
Change over 7 and 30 days compares the current reading with the reading closest to that date. When we have no reading that far back, we show nothing rather than compare against the oldest value we happen to hold.
Reference new price, where it appears, is the new price observed for the same model. It exists only for models still sold new, and the discount we display is the difference between two observed amounts — never an estimate.
Common questions
The important points at a glance
How often are prices recorded?
Once or twice a day. Every page names the time of the last reading so a figure can always be placed in time.
Why track only an entry price?
Storage and cosmetic grade change the final amount. A single entry price stays comparable across models and across months without inventing equivalences.
Is an old price ever overwritten?
No. Readings are kept as a time series, which is what allows every indicator to be derived from the real history rather than from the latest snapshot.