Walmart Products by Category

Use this endpoint when you need to browse or list Walmart products within a known category ID, especially when you want to apply price filters, sort options, or location context. Prefer this over keyword search when you already know the category and want broad category browsing rather than keyword-driven results.

• Invalid or non-existent category_id returns empty results or error
• Missing required category_id parameter causes 400 error
• Invalid domain value (not 'us' or 'ca') causes validation error
• Invalid sort_by value causes validation error
• Payment not processed (x402 payment required) returns 402 status
• Page number out of range returns empty results