I use a personal AI agent to watch listings and shop for me, and in November 2026 it started getting blocked on eBay. Does eBay allow AI shopping agents, what does its user agreement actually say, and which other big sites ban or restrict buy-for-me agents?

What should I check, step by step?

1. Read the site's terms, not just robots.txt. eBay's ban is in its User Agreement; robots.txt and AI-preference signals don't tell you whether a buy-for-me agent is allowed.

2. Look for a named allowlist or a permission route. Target lists approved agents; Resy names ChatGPT and Claude; eBay requires prior express permission but publishes no process.
3. Don't hand your password to an unapproved agent. eBay's agreement bars sharing log-in credentials with third parties and points to its Multi-User Account Access program instead; Amazon cited a third-party agent appearing to capture and store customer credentials.
4. Keep a human review step before any order. eBay names "end-to-end flow that attempts to place orders without human review" as an example of prohibited automation, and under its terms a purchase or winning bid is a binding contract for the account holder.
5. Expect intermittent blocks rather than a clear refusal. eBay's enforcement is technical and selective, so an agent may work one day and be blocked the next; treat that as a signal the site hasn't approved it.
6. If you run the site, say it plainly in both places: terms that name which agents may do what, and edge rules that enforce it, with a public way for operators to request access.
7. Keep your own record of what your agent was allowed to do and what it did on each site, in case an order or an account action is questioned later.

What does eBay's user agreement say about buy-for-me agents and LLM-driven bots?

The clause sits in Section 3, "Using eBay", in the list of things users agree not to do. eBay's help page shows the current agreement, effective June 28, 2026 for existing users, and states that the previous amendment took effect for all users on February 20, 2026; the agent wording appears in that earlier version too. The same list bars circumventing technical measures, imposing an unreasonable or disproportionately large load, and harvesting information about users without consent.

• The ban covers access "for any purpose", so on its face it reaches browsing, price checks and listing collection, not just checkout. Buy-for-me agents and LLM-driven bots are listed regardless of whether a person reviews the result; "without human review" qualifies only the third example, end-to-end ordering flows.
• Enforcement is written around the account: if eBay believes you're violating the agreement it may limit, suspend or terminate your account and take technical or legal steps. Section 8 makes a buyer responsible for reading the full listing, and a purchase or accepted bid forms a binding contract, whoever clicked.

Is eBay blocking AI shopping agents like Meta's Muse?

The Verge reported on November 10, 2026 that a reader's Muse agent, which had been building a daily digest of watch listings, stopped being able to pull eBay links or details over the weekend; The Verge reproduced the block and found Muse sometimes pointed to outside sites mirroring eBay listings. By November 12 it described Muse's access as hit or miss.

• eBay's statement: it takes "a selective approach" to third-party access, has restricted agents in some cases including unauthorized scraping and training on its data, and is in discussions with potential partners. After publication it added that the restrictions are not a blanket ban and that it permits AI search, discovery and certain agent-assisted navigation in accordance with its policies.
• That leaves a gap between the contract (no automated access without prior permission) and the stated practice (some agent-assisted browsing allowed). The policies eBay referred to aren't reproduced in the agreement, and it hasn't said which agents hold permission.

Which companies ban or restrict AI shopping agents?

Business Insider's November 12, 2026 list: Amazon's Conditions of Use say it may limit, including by technical measures, whether and how any agent accesses its services, and Muse users in September saw a notice that continued access by an unauthorized AI agent violated those conditions. Target's terms bar AI shopping agents unless authorized and list approved ones that may sign in, build carts, place orders and start returns with the customer's permission. Booking.com bars AI assistants without permission; Resy supports ChatGPT and Claude and may block others; Yelp requires express permission for non-human traffic; United Airlines said unauthorized agents may not search, book, buy or manage trips.

• Not every retailer is closing the door. The Verge notes Shopify has opened its catalog so shoppers can send agents to buy, and PPC Land reports Walmart set out agent profiles, an agent gateway and customer-set spending limits on October 21, 2026.
• For site owners the pattern is the same: the rule lives in the terms, the enforcement lives at the edge, and the agents that get through are the ones a site can identify. Agents that sign requests with Web Bot Auth give a site something to allow by name instead of guessing from a user-agent string.