eBay blocks third-party AI agents from browsing its listings

A shopping agent that worked last week may read nothing on eBay this week. The Verge reports that eBay has blocked Meta's Muse agent, and other third-party agents, from browsing listings on its site. The story was reported by Mia Sato.

A Verge reader told the outlet about his Muse agent. For weeks it had read eBay and sent him a daily digest of watches for sale. The digest held each link, the price, the delivery details and a note on condition. That stopped over the past weekend. Muse told him it was blocked from the site. The Verge reproduced the behaviour on other searches. In some runs Muse pointed instead to outside sites that mirror eBay listings.

What eBay said

The Verge asked eBay directly. The company's spokesperson, Sybille St. Arromand, would not say whether a new limit had been applied. She told the outlet that eBay takes "a selective approach" to how third parties reach its marketplace. The company had "restricted agent access in certain cases, including unauthorized scraping and training on our data". The Verge reports that Meta declined to comment.

The company's user agreement already banned "buy-for-me agents" and "LLM-driven bots" that place orders without human review. Until recently, Muse and similar agents could still browse. That is what changed.

The wider line through the agent market

Retailers are not moving in one direction. The Verge writes that Amazon blocks external agents from browsing or shopping at all. Target lets some agents browse and blocks others. The outlet says Shopify has opened a catalogue of about a billion listings. A shopper can point an agent at that catalogue and buy.

So a shopping agent's reach depends on the site. A team that builds one has to carry a list. Which retailers answer, which answer sometimes, which return nothing. The list changes without notice, as eBay's did this weekend.

The agent protocols the industry has been building do not help here. Model Context Protocol and the agent-payment schemes describe how an agent speaks to a server that chooses to answer. A server that blocks the agent at the edge, as eBay has, is a different problem. The agent never reaches a server it could talk to.

The step for a buyer of a shopping-agent service is simple. Ask the vendor for a live list of what their agent can read today. Then plan for that list to shrink. The vendor's demo may still work on the retailers it chose at launch. The question is which of them answer in six months.

There is a wider point for AI answer engines too. ChatGPT and similar tools may still link to a retailer in a response. A reader who clicks the link and asks an agent to buy may hit the same wall. The link reads, the buy step is refused.

Source

eBay appears to have shut the door on third-party AI agents, Mia Sato, The Verge.