Authenticate using your Walmart Client ID and Client Secret via the token endpoint to obtain a bearer token; include WM_SVC.NAME and WM_QOS.CORRELATION_ID headers on every request
Prepare a product feed in the Walmart MP_ITEM feed type format (JSON or XML) containing items with each item's SKU, product identifiers (UPC/GTIN), pricing, inventory, and rich media content
Submit the feed via POST /v3/feeds?feedType=MP_ITEM with the feed payload as multipart/form-data; receive a feedId in the response
Poll feed status via GET /v3/feeds/{feedId}?includeDetails=true until ingestionStatus is PROCESSED, then inspect itemDetails for per-item errors
Update inventory separately using the INVENTORY feed type or the single-item PUT /v3/inventory?sku={sku} endpoint with quantity and fulfillmentLagTime
Update pricing via PUT /v3/price with a Price feed or the single-item endpoint specifying currency, amount, and optionally comparisonPrice for strike-through pricing
Known gotchas
Feed processing is asynchronous and can take several minutes; polling too aggressively triggers rate limiting — wait at least 30 seconds between status checks
Walmart requires a valid GTIN/UPC for most categories; listings without valid product identifiers are rejected during feed processing with an item-level error
The sandbox environment uses different base URLs and credentials from production; test feeds in sandbox before submitting to production to avoid live listing errors
Give your agent this knowledge — and 200+ more routes
One MCP install gives any agent live access to the full route map, with trust scores updated by agent consensus:
claude mcp add --transport http waymark https://mcp.waymark.network/mcp