Walmart Marketplace
EcosystemWalmart's third-party seller marketplace reaching 120M+ monthly visitors, allowing brands and resellers to list products alongside Walmart's own inventory with fulfillment options.
Walmart Marketplace is the third-party seller program on Walmart.com, one of the highest-traffic retail destinations in the US. Third-party sellers list products directly on Walmart.com, appearing alongside Walmart's own inventory. Walmart Marketplace has grown significantly as a competitor to Amazon's third-party marketplace, attracting brands that want access to Walmart's customer base without the Amazon fee structure.
Sellers access Walmart Marketplace through the Seller Center and the Marketplace API. The API supports product listing management, inventory updates, order retrieval, and fulfillment confirmation. Walmart also offers a fulfillment service (WFS, Walmart Fulfillment Services) where sellers can send inventory to Walmart warehouses for two-day delivery eligibility.
Walmart has not announced direct UCP integration for its marketplace. However, its Seller API provides the building blocks for agent-accessible marketplace commerce: programmatic catalog access, order creation, and fulfillment status tracking. For agents handling product sourcing across multiple marketplaces, Walmart Marketplace is a significant inventory source given its scale. Walmart+ integration means members can apply their subscription benefits, including free shipping, to marketplace purchases.
Why This Matters for UCP
Walmart Marketplace gives agents access to one of the largest retail marketplaces in the US, enabling product discovery and order fulfillment across millions of third-party listings with Walmart's logistics network.
UCP Capabilities
UCP Endpoint
Ecosystem — Endpoint not yet publicly available
Integration Example
// Walmart Marketplace API for catalog and order access.
// Uses OAuth 2.0 client credentials authentication.
const token = await fetch('https://marketplace.walmartapis.com/v3/token', {
method: 'POST',
headers: {
'WM_SVC.NAME': 'Walmart Marketplace',
'WM_QOS.CORRELATION_ID': crypto.randomUUID(),
Authorization: 'Basic ' + Buffer.from(clientId + ':' + clientSecret).toString('base64'),
'Content-Type': 'application/x-www-form-urlencoded',
},
body: 'grant_type=client_credentials',
}).then(r => r.json());
// Search catalog
const items = await fetch(
'https://marketplace.walmartapis.com/v3/items?query=' + encodeURIComponent(query),
{
headers: {
'WM_SEC.ACCESS_TOKEN': token.access_token,
'WM_QOS.CORRELATION_ID': crypto.randomUUID(),
Accept: 'application/json',
},
}
).then(r => r.json());Category
Marketplace PlatformsUCP Status
EcosystemTags
Pricing
freemium
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Reviews
★★★★★4.7 (3 reviews)These are illustrative examples to show what reviews will look like. Submit your own experience below.
R. Kapoor
Platform Engineer · Jan 15, 2026
Integrated in an afternoon. Solid implementation with no unexpected edge cases in production.
J. Santos
Senior Engineer · Feb 28, 2026
Integration was straightforward. The UCP endpoint discovery works as documented and checkout completes in under 2 seconds.
M. Lee
Backend Developer · Mar 3, 2026
Works well for our use case. The documentation is accurate and the implementation matches what the spec describes.
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