A log-weighted index of the median observed price of every canonical part, rebased to 100 at the start of the window. Read it before you commit to a build — it is the same data the forecast board runs on.
Prices are the median across every seller carrying a canonical part, observed continuously by the Price Watch agent. The index is log-price weighted so a $500 compute module does not drown out a $2 sensor. Forecasts combine the 180-day trend, aggregate stock depth, listing competition and currency exposure — they are estimates, not promises.
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