PRODUCT FINDER QUERY FIELDS  (/api/data/finder)

Send a JSON object in "selection" (GET, URL-encoded) or as the POST body.
All filters are combined with AND. Array filters match any listed value (OR), max 50 values.
Prices are in cents (2499 = $24.99). Ranges use the suffixes _gte (>=) and _lte (<=).
Returns an ordered ASIN list; get details with /api/data/product (up to 100 ASINs per call).

PAGING & SORTING
  page              integer, starts at 0
  perPage           integer, 50 to 2000 (default 50)
  sort              up to 3 pairs, e.g. [["current_SALES","asc"],["monthlySold","desc"]]
                    default: best sales rank first

CATEGORY & TEXT
  rootCategory, categories_include, categories_exclude   arrays of category IDs (find IDs via /api/data/category-search)
  title             keywords, all must appear
  brand, manufacturer, model, color, size, author, binding, publisher, format, material, style ...   string arrays
                    prefix a value with ✜ to exclude it

PRICES & VALUES  (replace <TYPE> with a series name below)
  current_<TYPE>_gte / _lte           current value
  avg1|7|30|90|180|365_<TYPE>_gte/_lte  average over N days
  delta1|7|30|90_<TYPE>_gte/_lte      absolute change vs N-day average (positive = dropped)
  deltaPercent1|7|30|90_<TYPE>_gte/_lte  percent change vs N-day average (positive = dropped)
  isLowest_<TYPE>, isLowest90_<TYPE>  true = at all-time / 90-day low
  backInStock_<TYPE>                  true = was out of stock in last 60 days, now available
  Series: AMAZON, NEW, USED, SALES (sales rank), LISTPRICE, BUY_BOX_SHIPPING (buy box incl. shipping),
          NEW_FBA, NEW_FBM_SHIPPING, WAREHOUSE, COUNT_NEW, COUNT_USED, RATING (45 = 4.5 stars), COUNT_REVIEWS

DEMAND
  monthlySold_gte/_lte                estimated units sold last month
  salesRankDrops30|90|180|365_gte/_lte  number of rank drops (each roughly one sale)
  deltaPercent90_monthlySold_gte/_lte

COMPETITION & BUY BOX
  totalOfferCount, offerCountFBA, offerCountFBM  _gte/_lte
  buyBoxIsAmazon, buyBoxIsFBA, buyBoxIsPrimeEligible   true/false
  buyBoxStatsAmazon30|90|180|365_gte/_lte   % of time Amazon held the buy box
  buyBoxStatsSellerCount30|90|180|365_gte/_lte   number of sellers who won the buy box
  buyBoxSellerId, sellerIds           seller ID arrays
  availabilityAmazon                  [-1] no Amazon offer, [0] in stock, [1] preorder, [3] backorder

STOCK & RISK
  outOfStockPercentage90_gte/_lte     0-100
  isHazMat, isAdultProduct, isHeatSensitive   true/false
  returnRate                          [1] low, [2] high

PHYSICAL
  packageWeight (g), packageLength/Width/Height (mm), itemWeight   _gte/_lte

FEES & MISC
  fbaFees_gte/_lte (cents), hasReviews, hasAPlus, hasMainVideo, variationCount_gte/_lte
  productType [0] standard, [5] variation parent
  singleVariation true = one variation per parent

MATCH HELPERS
  minMatch  {"brand":2}       how many array values must match
  exists    {"monthlySold":true}  require a field to have (or not have) a value

EXAMPLE: profitable private-label candidates
{"current_SALES_lte":30000,"current_BUY_BOX_SHIPPING_gte":2000,"current_BUY_BOX_SHIPPING_lte":6000,
 "buyBoxIsAmazon":false,"totalOfferCount_lte":10,"current_COUNT_REVIEWS_lte":300,
 "monthlySold_gte":300,"perPage":50,"sort":[["monthlySold","desc"]]}

COST: 10 credits + 1 per 100 results. stats=1 adds aggregate insights for +31 credits.