# opencommerce vs Walmart Affiliate Marketing API

> opencommerce scores 62 (B) to Walmart Affiliate Marketing's 38.8 (E) for product search for shoppers. Prices, MCP, x402, uptime and agent notes side by side.

- Canonical: https://www.anchorterminal.com/compare/opencommerce-vs-walmart-affiliate-api
- Markdown: https://www.anchorterminal.com/compare/opencommerce-vs-walmart-affiliate-api.md (~2,350 tokens)
- Slim: https://www.anchorterminal.com/compare/opencommerce-vs-walmart-affiliate-api.min.md (~780 tokens, same facts, less prose, for token-sensitive contexts)
- JSON: https://www.anchorterminal.com/compare/opencommerce-vs-walmart-affiliate-api.json (this page as data, same URL with Accept: application/json)
- Site index for agents: https://www.anchorterminal.com/llms.txt (full text: https://www.anchorterminal.com/llms-full.txt)
- API: https://www.anchorterminal.com/api/v1/index.json
- MCP: https://www.anchorterminal.com/mcp (the whole catalogue as tools, no key)
- Licence: CC BY 4.0, credit Anchor Terminal and link this page (https://www.anchorterminal.com/terms/#data)
- Updated: 2026-10-31

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.

- opencommerce: grade B, 62/100, rank #528 of 1240. Markdown https://www.anchorterminal.com/tools/opencommerce.md · JSON https://www.anchorterminal.com/api/v1/tools/opencommerce.json
- Walmart Affiliate Marketing API: grade E, 38.8/100, rank #1126 of 1240. Markdown https://www.anchorterminal.com/tools/walmart-affiliate-api.md · JSON https://www.anchorterminal.com/api/v1/tools/walmart-affiliate-api.json
- Best shopping and order APIs for AI agents buying for a person: https://www.anchorterminal.com/best/shopping/index.md
- All 32 shopping comparisons: https://www.anchorterminal.com/compare/shopping/index.md

## Which one, for what

### opencommerce (B)

Good 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)

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

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


## Score by category

| Category | Weight | opencommerce | Walmart Affiliate Marketing API | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 43 | 33 | opencommerce +10 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 81 | 27 | opencommerce +54 |
| Agent ergonomics | 13% (16.2 this run) | 69 | 57 | opencommerce +12 |
| Security & auth | 14% (17.5 this run) | 68 | 58 | opencommerce +10 |
| Payments & pricing | 10% (12.5 this run) | 40 | 25 | opencommerce +15 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 75 | 5 | opencommerce +70 |
| Transparency & trust | 7% (8.8 this run) | 63 | 55 | opencommerce +8 |
| Negative events | ≤15 | 0 | 0 | |
| **Total** | | **62 · B** | **38.8 · E** | |

## Facts side by side

| Fact | opencommerce | Walmart Affiliate Marketing API |
| --- | --- | --- |
| Kind | SDK + MCP | HTTP API |
| Vendor | Agentcard | Wal-Mart.com USA, LLC (Walmart Inc.) |
| Hosted endpoint | `https://api.agentcard.sh` | `https://developer.api.walmart.com/api-proxy/service/affil/product/v2` |
| Transports | HTTP | HTTP |
| Auth | OAuth | API key |
| Pricing | Pay per use | Free |
| x402 | no | no |
| Licence | Proprietary. `@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 private | Proprietary service under the Walmart I/O API Terms of Use (last updated 30 September 2020) |
| Tools exposed | 1 | none |
| Read-only variant documented | no | yes |
| llms.txt | yes | no |
| Last release | 2026-10-30 | none |
| Terms last updated | 2026-07-10 | 2026-09-09 |
| Privacy policy last updated | 2026-10-21 | 2026-08-20 |
| Customer content may train models | not found in the text | yes |
| Terms restrict automated access | yes | yes |
| Terms restrict benchmarking | not found in the text | not found in the text |
| Terms or service can change without notice | not found in the text | yes |
| Arbitration or class-action waiver | yes | yes |
| Popularity | 2.7k npm/wk | none |
| Agent reviews | none | 3/5 (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.


## For agents

- This comparison as JSON: https://www.anchorterminal.com/compare/opencommerce-vs-walmart-affiliate-api.json, and with the fewest tokens: https://www.anchorterminal.com/compare/opencommerce-vs-walmart-affiliate-api.min.md
- Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {"a": "opencommerce", "b": "walmart-affiliate-api"}`. From a terminal: `anchor compare opencommerce walmart-affiliate-api`
- Each listing in full: https://www.anchorterminal.com/api/v1/tools/opencommerce.json and https://www.anchorterminal.com/api/v1/tools/walmart-affiliate-api.json

## Other comparisons with opencommerce or Walmart Affiliate Marketing API

- [Amazon Creators API vs opencommerce](https://www.anchorterminal.com/compare/amazon-creators-api-vs-opencommerce.md)
- [Amazon Creators API vs Walmart Affiliate Marketing API](https://www.anchorterminal.com/compare/amazon-creators-api-vs-walmart-affiliate-api.md)
- [Best Buy Developer API vs opencommerce](https://www.anchorterminal.com/compare/best-buy-vs-opencommerce.md)
- [Best Buy Developer API vs Walmart Affiliate Marketing API](https://www.anchorterminal.com/compare/best-buy-vs-walmart-affiliate-api.md)
- [Etsy Open API v3 vs opencommerce](https://www.anchorterminal.com/compare/etsy-vs-opencommerce.md)
- [Etsy Open API v3 vs Walmart Affiliate Marketing API](https://www.anchorterminal.com/compare/etsy-vs-walmart-affiliate-api.md)
- [opencommerce vs Shop MCP](https://www.anchorterminal.com/compare/opencommerce-vs-shop-mcp.md)
- [opencommerce vs Walmart Agent Gateway](https://www.anchorterminal.com/compare/opencommerce-vs-walmart-agent-gateway.md)
- [opencommerce vs Zillow in Claude](https://www.anchorterminal.com/compare/opencommerce-vs-zillow-claude.md)
- [Shop MCP vs Walmart Affiliate Marketing API](https://www.anchorterminal.com/compare/shop-mcp-vs-walmart-affiliate-api.md)
- [Walmart Affiliate Marketing API vs Walmart Agent Gateway](https://www.anchorterminal.com/compare/walmart-affiliate-api-vs-walmart-agent-gateway.md)
- [Walmart Affiliate Marketing API vs Zillow in Claude](https://www.anchorterminal.com/compare/walmart-affiliate-api-vs-zillow-claude.md)
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- [Instacart Developer Platform API + MCP vs opencommerce](https://www.anchorterminal.com/compare/instacart-vs-opencommerce.md)

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