Walmart Marketplace product data API

The ShopAPIS Walmart Marketplace product data API returns price, Buy Box owner, first-party vs third-party seller, in-stock and store-level availability, ratings, review count, variant matrix and shipping/pickup options for any Walmart item ID — as clean JSON. One parser covers both walmart.com (US) and walmart.com.mx (Mexico), which share the same platform DNA, so you get cross-seller pricing the seller-gated Walmart API cannot provide.

Walmart Marketplace is the fastest-growing third-party platform in North America. It is the #3 US e-commerce site by traffic (SimilarWeb 2026) and hosts ~200,000 third-party sellers — with +44,000 added in the first five months of 2025. Roughly 47% of Walmart’s GMV now flows through third-party sellers (2025 estimate), making cross-seller Buy Box and price data increasingly valuable.

Why Walmart data is hard to get

Walmart runs one of the more aggressive anti-bot stacks in retail. It layers PerimeterX / HUMAN bot detection on top of Akamai and behavioral request scoring, and challenges automated traffic with session and device checks. The official Walmart Marketplace API  is gated to approved sellers and exposes only your own listings — not rivals’ offers or the cross-seller Buy Box. ShopAPIS maintains the parsing and rotation infrastructure so you receive structured fields without managing proxies or solving challenges.

Data fields returned

• Identifiers — Walmart item ID, US Item Number, UPC/GTIN, model, seller SKU.
• Pricing — current price, was/strike price, currency, per-offer pricing.
• Buy Box — pro/winning seller, total offers, “Sold & shipped by”.
• Seller type — 1P (Walmart.com) vs 3P marketplace seller, seller name and ID.
• Availability — online in-stock, limited-stock flag, store-level pickup/delivery.
• Ratings — average rating, review count, review samples.
• Variants — size/color/pack variants with per-variant price and stock.
• Fulfillment — shipping estimate, free-shipping flag, pickup eligibility.
• Media — image gallery URLs, category breadcrumb.

Sample response

{
  "platform": "walmart",
  "marketplace": "walmart.com",
  "item_id": "5689919121",
  "us_item_number": "568991912",
  "title": "Keurig K-Express Single Serve K-Cup Pod Coffee Maker, Black",
  "brand": "Keurig",
  "price": { "amount": 59.00, "currency": "USD", "was_price": 99.00 },
  "buy_box": { "seller": "Walmart.com", "total_offers": 6 },
  "seller_type": "1P",
  "seller": { "name": "Walmart.com", "id": "F55CDC31AB754BB68FE0B39041159D63" },
  "availability": "in_stock",
  "store_pickup": true,
  "rating": 4.5,
  "review_count": 8123,
  "variant": { "color": "Black", "size": "Single Serve" },
  "shipping": { "free": true, "estimate_days": 2 },
  "upc": "0611247391211",
  "category_path": ["Home", "Kitchen & Dining", "Coffee Makers"],
  "images": ["https://i5.walmartimages.com/asr/keurig-k-express.jpeg"],
  "scraped_at": "2026-06-05T11:45:00Z"
}

Markets & domains covered

• United States — walmart.com (USD).
• Mexico — walmart.com.mx (Walmart de México y Centroamérica, MXN); related Bodega Aurrerá and Sam’s Club MX surfaces.

Both share platform structure and PerimeterX/HUMAN defenses, so one parser scales across the cluster.

Use cases

• Cross-channel repricing — compare Walmart Buy Box prices against Amazon and eBay. Feeds price monitoring.
• 3P seller intelligence — identify who is selling your catalog and at what price. See competitive intelligence.
• MAP enforcement — catch below-MAP listings on the marketplace. See MAP compliance.
• Stock & store availability — monitor in-stock and pickup status. See inventory tracking.

Related

Stats from ShopAPIS market research, June 2026 (@plans/plan2-research/reports/north-america.md); sources: SimilarWeb 2026, RedStag/Digital Commerce 360 2025. Anti-bot stack (PerimeterX/HUMAN + Akamai) per SpyderProxy 2026.