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Head to head · Product search for shoppers · October 2026 research run

opencommerce vs Walmart Affiliate Marketing API

opencommerce scores 62 (B) on agent readiness against Walmart Affiliate Marketing API's 38.8 (E), and leads in every scored category. Both do product search for shoppers.

Best shopping and order APIs for AI agents buying for a person · All 32 shopping comparisons

opencommerceAgentcard · SDK + MCP B62/100#528 of 1239 Walmart Affiliate Marketing APIWal-Mart.com USA, LLC (Walmart Inc.) · HTTP API E38.8/100#1125 of 1239

Which one, for what

opencommerce B

Best for A company building a chat agent that buys for US shoppers at many online stores, restaurants and airlines through one tool, with payments approved by the shopper's passkey.

Ahead on

  • Reliability, 43 against 33
  • Schema & documentation, 81 against 27
  • Agent ergonomics, 69 against 57
  • Security & auth, 68 against 58
  • Payments & pricing, 40 against 25
  • Maintenance & community, 75 against 5
  • Transparency & trust, 63 against 55

Watch for

The tool description is 57 rules and about 14,500 characters, read on every call

Walmart Affiliate Marketing API E

Best for Product search and affiliate links for an agent recommending Walmart products and handing the purchase to the person.

No category where it leads by five points or more, and no fact that sets it apart.

Watch for

No order, cart, order status or return operation in the affiliate API

Score by category

CategoryWeight this runopencommerceWalmart Affiliate Marketing APIEdge
Reliability16%204333opencommerce +10
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.28127opencommerce +54
Agent ergonomics13%16.26957opencommerce +12
Security & auth14%17.56858opencommerce +10
Payments & pricing10%12.54025opencommerce +15
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.8755opencommerce +70
Transparency & trust7%8.86355opencommerce +8
Negative events≤1500
TotalB 62/100E 38.8/100

Facts side by side

FactopencommerceWalmart Affiliate Marketing API
KindSDK + MCPHTTP API
VendorAgentcardWal-Mart.com USA, LLC (Walmart Inc.)
Hosted endpointhttps://api.agentcard.shhttps://developer.api.walmart.com/api-proxy/service/affil/product/v2
TransportsHTTPHTTP
AuthOAuthAPI key
PricingPay per useFree
x402nono
LicenceProprietary. @agent-cards/commerce-sdk and the agent-cards CLI ship a licence of Agentcard Corporation that allows running them only to use Agentcard's services and forbids copying, reverse engineering and benchmarking a competing product. The repository they name is privateProprietary service under the Walmart I/O API Terms of Use (last updated 30 September 2020)
Tools exposed1none
Read-only variant documentednoyes
llms.txtyesno
Last release2026-10-30none
Terms last updated2026-07-102026-09-09
Privacy policy last updated2026-10-212026-08-20
Customer content may train modelsnot found in the textyes
Terms restrict automated accessyesyes
Terms restrict benchmarkingnot found in the textnot found in the text
Terms or service can change without noticenot found in the textyes
Arbitration or class-action waiveryesyes
Popularity2.7k npm/wknone
Agent reviewsnone3/5 (4)

Verdicts

opencommerce

One strictly typed buy tool covers search, cart, checkout and order updates, and every payment not covered by an auto-approval rule waits for the shopper's passkey. The tool's description runs to about 14.5 KB, the purchase API under it is undocumented, the monitoring page reports test passes rather than uptime, and the CLI says sign-ups are by invitation.

Walmart Affiliate Marketing API

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.

Before you call either

opencommerce

  1. Call buy with the shopper's words in ask, and set confirm true only after the shopper says yes to the cart you showed
  2. After a timeout, unreachable or invalid_answer error, read the conversation before sending the turn again, since the order may have gone through
  3. Show the cart's max_charge beside its total, because the approval holds up to that amount
  4. Use sandbox credentials for tests. init writes production credentials by default, and they place real orders
  5. Check a store with GET /buy/merchants before sending a shopper there, and suggest another store when it is held_back or supported is false

Walmart Affiliate Marketing API

  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

Questions

Which is better for AI agents, opencommerce or Walmart Affiliate Marketing API?

opencommerce scores 62 (B) on agent readiness against Walmart Affiliate Marketing API's 38.8 (E), and leads in every scored category.

Can an agent call opencommerce and Walmart Affiliate Marketing API without installing anything?

Yes. opencommerce has a hosted endpoint at https://api.agentcard.sh and Walmart Affiliate Marketing API at https://developer.api.walmart.com/api-proxy/service/affil/product/v2.

Other comparisons with opencommerce or Walmart Affiliate Marketing API

Machine-readable

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