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Item search support for EAN and ISBN in the US market

Date: August 20, 2026

Summary

The Item search API now supports additional product identifiers for the US market, making it easier to find matching Walmart catalog items before item setup. This release also introduces 5.x support for the seller-fulfilled MP_ITEM_MATCH specification.

What’s new

  • EAN and ISBN search support: In the US market, you can now search the Walmart catalog using ean or isbn.
  • Default response support: With responseFormat=DEFAULT, you can search by query, upc, gtin, ean, or isbn.
  • Spec-format response support: With responseFormat=SPEC, provide exactly one of upc, gtin, ean, isbn, or asin. SPEC is supported only in the US market, and asin remains supported only with SPEC.
  • Updated MP_ITEM_MATCH specification: Seller-fulfilled offer setup by match now supports the 5.x specification.

Why it matters

EAN and ISBN support expands catalog search coverage for products that use international or book-specific identifiers. This can help sellers identify existing Walmart catalog items more accurately, reduce duplicate setup attempts, and choose the appropriate item setup workflow more quickly.

Moving MP_ITEM_MATCH to 5.x also aligns seller-fulfilled offer setup by match with the current item specification framework.

Next steps

Update your US Item Search API integration to use ean or isbn where applicable, and review your validation logic for responseFormat=DEFAULT and responseFormat=SPEC.

For more information and usage examples, refer to the Item search API Guide.