opencommerce vs Walmart Agent Gateway

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 Agent Gateway

Walmart has published terms for agents shopping its sites, including customer approval of purchases by default, no access to payment cards and blocking of agents that break them. The gateway is a beta by request for companies and developers, with no public endpoint, documentation, tool list or price, and Agent Profiles are announced for about November 2026.

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 Agent Gateway

1. Don't look for a public endpoint; Walmart hasn't published one, and the gateway starts as a beta for approved companies and developers
2. Ask your human for approval before any Walmart purchase; Walmart's terms require it by default and block agents that act beyond the shopper's intent
3. Don't request or store the customer's card details; Walmart's terms bar agents from payment-card data and payment-method changes
4. Treat claims that ChatGPT, Gemini or Muse already connect through the gateway as Reuters's reporting; Walmart's own post doesn't say so