# Walmart Affiliate Marketing API (slim)

> Walmart's read-only catalogue API for affiliates, documented on the Walmart I/O portal. It searches Walmart.com products and returns item details, reviews, taxonomy, trending items, recommendations and nearby stores, with affiliate links tracked through Impact. It cannot place orders.

- Full: https://www.anchorterminal.com/tools/walmart-affiliate-api.md (~6,200 tokens) · this version ~1,280 tokens · JSON https://www.anchorterminal.com/tools/walmart-affiliate-api.json · canonical https://www.anchorterminal.com/tools/walmart-affiliate-api
- Index: https://www.anchorterminal.com/llms.txt · API: https://www.anchorterminal.com/api/v1/index.json · Updated: 2026-10-14

**E · 38.6/100 · rank #995 of 1076 · #5 in Shopping, returns & refunds · not agent-ready · confidence low**


Assessment: Live, free catalogue search and product lookup for approved Walmart affiliates, signed with an RSA key and capped at 5,000 calls a day. It cannot place or follow orders, and the Checkout API needs separate approval. The documentation renders only in a browser, and the API terms date from 2020 and still name a previous affiliate network.

## Facts

- Kind: HTTP API · vendor: Wal-Mart.com USA, LLC (Walmart Inc.) · category: Shopping, returns & refunds · legal entity: Wal-Mart.com USA, LLC · provenance 71/100
- Endpoint: `https://developer.api.walmart.com/api-proxy/service/affil/product/v2` (HTTP)
- Auth: API key · pricing: Free · x402: no · licence: Proprietary service under the Walmart I/O API Terms of Use (last updated 30 September 2020)
- Probe metrics: not measured yet (probes haven't run)
- Surface listed: Walmart Affiliate Marketing API v2 at developer.api.walmart.com, read from the walmart.io portal script and an unauthenticated probe on 14 October 2026
- Endpoints: /api-proxy/service/affil/product/v2/ search, items, paginated/items, postbrowse, nbp, reviews, stores, taxonomy, trends, plus feeds (bestsellers, preorder, rollback, items), clearance and specialbuy
- Search parameters: query (required), publisherId, numItems (default 10, maximum 25), start, sort, order, responseGroup (base or full), facet (on or off)
- Authentication: RSA key pair. Consumer ID and key version issued on public key upload. Headers WM_CONSUMER.ID, WM_CONSUMER.INTIMESTAMP, WM_SEC.KEY_VERSION, WM_SEC.AUTH_SIGNATURE, signature valid 180 seconds
- Rate limit: 5,000 calls a day under the API terms. Feed API access by email request per category
- Checkout API: Separate, subscription based, needs approval and a business case. Guest checkout v2 and account linking with prepare and place order. Not graded here

- Scores: Reliability 33, Performance pending, Schema & documentation 27, Agent ergonomics 57, Security & auth 58, Payments & pricing 25, Task success pending, Maintenance & community 5, Transparency & trust 53 · total over the 7 assessed categories
- Why: Reliability, No status page was found. · Schema & documentation, No OpenAPI or machine-readable description for the affiliate API. · Agent ergonomics, responseGroup base or full and numItems up to 25 size responses, without field selection (15 of 25). · Security & auth, Requests are signed with the developer's RSA private key, which is never sent, and signatures expire after 180 seconds. · Payments & pricing, No x402, MPP or L402 (0 of 40). · Maintenance & community, No dated release, changelog or change notice for the affiliate API was found (0 of 30). · Transparency & trust, Closed service with API terms shown in the portal, last updated 30 September 2020. They still name Rakuten LinkShare and MySpace while the s…
- Sources: 10, open questions: 5, both in the full twin
- Capabilities: shopping.search, shopping.prices, shopping.affiliate
- JSON: https://www.anchorterminal.com/api/v1/tools/walmart-affiliate-api.json
- Verify (for the vendor): the badge `https://www.anchorterminal.com/badges/walmart-affiliate-api.svg` or a link to https://www.anchorterminal.com/tools/walmart-affiliate-api from a page on walmart.com or walmart.io or one of their subdomains, then `POST https://www.anchorterminal.com/api/v1/verify` `{"slug", "url"}` or `verify_listing` at /mcp; re-checked weekly, no effect on the grade. Snippets in the full twin.

## Before you call it

1. Generate a fresh WM_SEC.AUTH_SIGNATURE for each call, because a signature older than 180 seconds is rejected
2. Keep below 5,000 calls a day per application
3. Pass the Impact publisher ID so returned links earn commission
4. Hand purchases to the person through the returned product link, since the affiliate API cannot check out

## Similar tools

| Tool | Grade | Score | Shared capabilities | Slim |
| --- | --- | --- | --- | --- |
| Amazon Creators API | D | 48.7 | shopping.search, shopping.prices, shopping.affiliate | https://www.anchorterminal.com/tools/amazon-creators-api.min.md |
| Etsy Open API v3 | B | 63.4 | shopping.search, shopping.prices | https://www.anchorterminal.com/tools/etsy.min.md |
| Best Buy Developer API | E | 39.1 | shopping.search, shopping.prices | https://www.anchorterminal.com/tools/best-buy.min.md |
| Instacart Developer Platform API + MCP | D | 48.3 | shopping.affiliate | https://www.anchorterminal.com/tools/instacart.min.md |


## Panel reviews (0, desk reviews from public material, no calls made)