Price index for a specific retailer over time
Compute a normalized price index (retailer avg / category avg) for a specific retailer day-by-day versus its category baseline. Points report insufficient_sample below sample_threshold products plus stable_avg_price over the products priced every day — read trends from the stable series.
Query Parameters
Retailer platform key (e.g., amazon, walmart)
Country (us or ca)
us, ca Product category. Accepts a human-readable name (e.g. 'electronics', 'beauty') or a taxonomy slug path (e.g. 'electronics/headphones'); matched against the catalog's category tree (exact node, subtree, or path substring). Also accepts a GS1 GPC code (exactly 8 digits, e.g. '10001159') to filter by PRODUCT TYPE instead of by shelf placement — the same product type is shelved under different categories by different retailers, so a category filter answers from a fraction of the data while a GPC code spans them. Coarser codes (class/family/segment) match every brick beneath them. Resolve a phrase to a code with /v1/reference/classify?q=... ; when a code is used, resolved.match_source is 'gpc'. For analyst endpoints, supply either category or department; both may be supplied to narrow the scope.
1Top-level department (root category), e.g. 'Electronics', 'Beauty', 'Home & Kitchen'. Case-insensitive; matched against the category tree's root segment. For analyst endpoints, supply either category or department; both may be supplied to narrow the scope.
1Historical window preset. Explicit from/to takes precedence and is reported as custom; time_window=custom requires both from and to. Date-only ranges use UTC calendar boundaries with inclusive from and exclusive to.
last_30_days, last_60_days, last_90_days, month_to_date, previous_month, month_over_month, quarter_to_date, custom Start date (ISO 8601, defaults to 30 days ago)
End date (ISO 8601, defaults to now)
Response
Retailer index data
True when any series point has a basket below sample_threshold.
Products priced in every period of the series (the basis of stable_avg_price). Null for single-point series.

