eBay's User Agreement prohibits buyers and sellers from using "buy-for-me agents, LLM-driven bots, or any end-to-end flow that attempts to place orders without human review" on the marketplace unless the company grants "prior express permission," a restriction carried in the version of the contract that took effect for existing users on June 28, 2026, and, word for word, in the version before it, which became effective for all users on February 20, 2026. How eBay polices the rule came into view in November, when The Verge reported on November 10 that Meta's Muse agent had been blocked from pulling eBay listings over the preceding weekend.

In Short

eBay's contract with its users bans shopping agents, AI-driven bots and fully automated checkout flows unless eBay gives prior express permission, and the clause has been in force since February 20, 2026. In November, Meta's Muse agent stopped reliably reaching eBay listings, and eBay told The Verge it blocks unauthorized scraping while still allowing some AI search, discovery and agent-assisted navigation. If you build, sell through or rely on shopping agents, eBay treats them as prohibited by default, and it has not published which agents have permission or how one gets it.

What the agreement says

The restriction sits in Section 3, "Using eBay," inside a list of conduct that every user agrees to avoid. The full clause reads that users will not "use any robot, spider, scraper, data mining tools, data gathering and extraction tools, or other automated means (including, without limitation buy-for-me agents, LLM-driven bots, or any end-to-end flow that attempts to place orders without human review) to access our Services for any purpose, except with the prior express permission of eBay."

Three features of that sentence matter. The first is breadth. The prohibition covers access "for any purpose," which on its face includes browsing, price checks and listing collection, not only checkout. The second is structure: the parenthesis names three examples - buy-for-me agents, bots driven by an LLM, and end-to-end flows that place orders without human review - and the qualifier "without human review" attaches grammatically to the third. A buy-for-me agent is listed as prohibited whether or not a person checks its work. The third is the exit door. Everything in the clause is permitted if eBay says so in advance, which turns the clause into a gate that eBay alone can open.

The surrounding list adds companion rules. Users must not "circumvent any technical measures used to provide our Services," must not "interfere with the functioning of our Services, such as by imposing an unreasonable or disproportionately large load on our infrastructure," and must not "harvest or otherwise collect or use information about users without their consent." Another item touches a practical mechanism that many agents rely on: users may not "share your log in credentials with any third parties. If you require that authorized third parties (employees, agents, etc.) have access to your account we offer a Multi-User Account Access program for that purpose." The agreement does not say whether that program extends to software agents, or only to people.

What happens to an account that breaks the rule

The enforcement paragraph is written around the account holder, not the software. "If we believe you are violating this User Agreement or any of our policies, or abusing eBay and/or our Services in any way, we may, in our sole discretion and without limiting other remedies, limit, suspend, or terminate your user account(s) and access to our Services," the agreement states. The list continues with removing hosted content, demoting listings, reducing discounts and the option to "take technical and/or legal steps to prevent you from using our Services." A separate sentence reserves "the right to refuse, modify, or terminate all or part of our Services to anyone for any reason at our discretion."

That framing creates an asymmetry. Under the contract, the person who points an agent at eBay is the party in breach. The technical block that The Verge described, by contrast, landed on the agent itself.

The purchase terms in Section 8 sharpen the point. A buyer "enter[s] into a legally binding contract to purchase an item when you buy the item, commit to buy the item, your offer for the item is accepted, you have the winning bid for the item, or your bid for the item is otherwise accepted." The same section makes the buyer "responsible for reading the full item listing before making a bid or offer, buying, or committing to buy." An agent that bids on its own still binds its owner, and the reading duty stays with a human.

Two versions, one unchanged clause

The ebay.com help page carrying the agreement shows two texts. The current one opens: "For users who agreed to a prior version of our User Agreement, this agreement is effective as of June 28, 2026. For users who had not previously agreed to the User Agreement, this agreement is effective upon acceptance. The previous amendment to this User Agreement was effective for all users on February 20, 2026." Below it, under a "Previous User Agreement" heading, sits the February version.

PPC Land compared the two texts word by word. The agent clause is identical in both. The 128 days between February 20 and June 28 brought other changes: a new "eBay Live" subsection covering the live-streaming sales feature, permission for eBay to contact users "by email to any email address that you have provided us," a new arbitration provision letting either side push small-claims-sized disputes back to small claims court, and a switch from emailed or mailed dispute notices to a webform. The previous version told users to send notices to an address in Draper, Utah. The sentence on message scanning also softened from "eBay's automated systems scan" to "eBay's automated systems may scan."

The agent language therefore predates June. According to The Register, which reported the change on January 22, 2026, eBay posted the update with the buy-for-me wording on January 20. That date sits 31 days before the February 20 effective date, which fits the agreement's own amendment rule: "We will provide you 30 days' notice by posting the amended terms. Additionally, we will notify you through the eBay Message Center and/or by email." The Register also noted that the robot, spider and scraper language was already in the earlier contract. What January added was the explicit naming of agents and LLM-driven bots.

Who signs this agreement? The ebay.com text names six contracting entities depending on where a user lives: eBay Inc. in San Jose for the United States, eBay (UK) Limited in London, eBay GmbH in Kleinmachnow for the European Union, eBay Canada Limited in Toronto, eBay Singapore Services Private Limited for users in India, and eBay Marketplaces GmbH in Bern for "any other country."

Muse finds the eBay door stuck

The Verge's report, by Mia Sato and dated November 10, 2026, began with a reader. For several weeks, according to the publication, he had used Muse to browse eBay and other platforms and build a daily digest of watches for sale, with links, prices, shipping details and notes on condition or style. Over the weekend before the report, Muse could no longer pull links or details from eBay and told him it had been blocked. The Verge said it reproduced the result with other search requests and, in some cases, found that Muse directed users instead to outside sites that mirrored eBay listings.

By November 12, The Verge wrote, Muse's ability to reach eBay "seems to be somewhat hit or miss," with the agent alternately getting blocked and getting through. Meta declined to comment.

eBay's spokesperson, Sybille St. Arromand, told The Verge in an email that AI is becoming embedded throughout eBay for discovery, personalization and selling. She declined repeated questions about whether eBay had recently imposed new limits on agents. Her statement read: "As it pertains to third-parties, we take a selective approach to how they access and interact with our marketplace. We have restricted agent access in certain cases, including unauthorized scraping and training on our data. We have ongoing discussions with potential partners and are evaluating ways third-party agents could help new customers discover eBay's unmatched inventory, and our focus is on preserving the trusted end-to-end experience that buyers and sellers expect from eBay."

After publication, according to The Verge, St. Arromand added that the restrictions were not a blanket ban and that eBay permits "AI search, discovery and certain agent-assisted navigation in accordance with our policies, while blocking unauthorized automated scraping - including data collection for model training - when detected." She did not explain why Muse lost access.

The contract and the statement do not line up neatly

Read side by side, the two documents describe different regimes. The contract bans automated access "for any purpose" absent prior express permission. The spokesperson describes a default that allows AI search, discovery and some agent-assisted navigation, and targets unauthorized web scraping and data collection for model training. The statement's phrase "in accordance with our policies" suggests a policy layer below the agreement that governs which agents get through. The agreement does not reproduce or link such a policy, and it does not describe any process for requesting permission.

Training is another gap. The spokesperson names "training on our data" as a reason eBay restricts agents. The agreement never uses the word in connection with AI models; its only use of "training" concerns recorded phone calls "for quality control and training purposes." The scraping and data-extraction wording is broad enough to reach collection for model training, but the document does not say so in terms.

And there is eBay's own use of the technology. Section 2 states: "We may use artificial intelligence or AI-powered tools and products to provide and improve our Services, to offer you a customized and personalized experience, to provide you with enhanced customer service, and to support fraud detection; availability and accuracy of these tools are not guaranteed." Section 7 makes sellers responsible for listing content "created using tools offered by eBay or third parties such as translation, image editing, and generative artificial intelligence tools." The help page that hosts the agreement even carries a "Search with AI" box. In the current text, "artificial intelligence" appears twice, "AI-powered" once and "LLM" once - in the ban.

Why eBay might want a human at the till

The Register offered a commercial reading in January. eBay charges sellers a variable "final value fee," the outlet noted, which means it earns more on higher-priced items, and bots "swooping in to win auctions on the site could mean more items sell for less, costing eBay cash." The agreement confirms the fee structure only in general terms: eBay charges sellers, lists its fees on its selling-fees pages, and can change them "by posting the changes on the eBay site fourteen (14) days in advance."

The Register's broader argument concerned attention. In the agentic vision, it wrote, people stop visiting websites and "therefore won't see any of the extra offers publishers use to boost their sales or engagement," while site operators contend with bots "programmed to never buy metaphorical fries with that." The outlet quoted McKinsey's description of "a world in which AI anticipates consumer needs, navigates shopping options, negotiates deals, and executes transactions, all in alignment with human intent yet acting independently via multistep chains of actions enabled by reasoning models."

eBay's agreement shows what is at stake in a page view. In Section 7 the company reserves the right to "display third-party advertisements (including links and references thereto) or other content in any part of our Services, including listings, in our sole discretion and without consent from, or payment, fee reduction, or other credit to, sellers." The same section allows eBay to "publish and promote your listings, including related content such as username, product reviews and feedback, in any format and through any channel, including across any eBay Services, our partners, or third-party property or advertising medium." An agent that reads a listing as data and returns a summary to its user renders none of those placements. A mirror site that copies eBay listings, of the kind The Verge said Muse pointed users to, sits outside the channels eBay controls; The Verge did not name the mirrors, and nothing in the material says whether any operates under an arrangement with eBay.

The same tension runs through Amazon's dispute with Perplexity. PPC Land reported in April that Amazon's $68.6 billion advertising business depends on shoppers seeing ads, and that Perplexity's appeal argued the federal hacking statute should not block AI shopping agents.

Closed doors, half-open doors and open ones

eBay's position sits on a spectrum that The Verge sketched. Amazon, according to the publication, blocks external agents from browsing or shopping entirely. Target has restrictions that let agents browse in some instances and blocks them in others. Shopify has opened its catalog of a billion listings so that shoppers can send agents to buy on their behalf.

Amazon's path to that position took more than a year. PPC Land reported that Amazon's robots.txt update of August 21, 2025, added six AI-related crawlers to its blocks, including ones operated by Meta, Google, Huawei and Mistral. On November 4, 2025, Amazon sent Perplexity a legal demand to stop Comet browser users from shopping on Amazon, and the same day it filed suit in the Northern District of California, alleging that Comet disguised itself as Chrome. The Register described the letter as essentially saying "This establishment does not serve shop-bots." Amazon's own agent work continued in parallel: two weeks later, Rufus gained price-triggered auto-buying.

Meta's Muse met Amazon's wall first. Meta launched the agent on September 8, 2026, as a US-only product that runs in a cloud virtual machine with its own browser and can buy things. On September 20, Amazon cut Muse off from shopping on Amazon.com, saying it had no agreement with Meta, that Muse did not identify itself when browsing, and that it appeared to capture and store customer credentials. Muse users were shown a notice saying that continued access by an unauthorized AI agent violated Amazon's Conditions of Use. eBay's contract has carried an equivalent prohibition since February.

Scale explains why one agent matters. HUMAN Security data published in late September showed Muse accounting for an average of 72% of daily AI-agent requests across its network, 5.2 times ChatGPT Agent's daily volume. On HUMAN's measurements, restricting Muse means restricting most of the agent traffic that its network sees. Meta has since begun testing signed requests: DataDome researchers found that some Muse traffic started carrying a cryptographic signature through Web Bot Auth from around October 12, a step that would let sites tell Muse apart from scrapers posing as it.

Other retailers have chosen terms over walls. Walmart on October 21 set out Agent Profiles, an Agent Gateway and a list of rules for third-party agents, letting agents buy within customer-set limits such as $50 or $100. Google in January launched the Universal Commerce Protocol, an open standard for agent purchases co-developed with Shopify, Etsy, Wayfair, Target and Walmart. eBay was not among the five co-developers. Google told The Register it does not envisage taking a cut of the sales it facilitates; the outlet observed that the company is "uncannily good at making itself an unavoidable player in markets it enters and then monetizing its dominance."

eBay's own trajectory has shifted. A PSE Consulting study published in September 2025 found that most major UK and US merchants welcomed AI agents, with Amazon the main exception; eBay was reported then as not blocking AI bots. Four months later, its contract named agents explicitly.

Security software as the enforcer

Contracts set the rules; bot management decides who actually gets in. An audit by Blend Commerce, reported by PPC Land on November 5, found that security software at 29 of 200 UK and US retailers refused its shopping agent on two separate attempts, while every refusing store whose crawler rules could be read allowed the search crawlers of ChatGPT, Perplexity and Claude. The finding suggests that blocks often come from fraud and bot tooling rather than from a deliberate policy decision about AI.

The Verge's own reporting supplies a reason retailers worry. In October, according to the publication, it found that Muse could hold product listings hostage on The RealReal, a secondhand designer consignment site, by having an agent continually add a product to the user's cart. The RealReal updated its bot system after that reporting. eBay's agreement already prohibits users from interfering "with any other user's listings"; an agent that hoards inventory on a user's behalf would put the account holder in breach of that rule as well.

Cloudflare made the cost argument directly. In a post dated November 5, the company said websites bear the primary cost in nearly all of 14 problems that agents acting for people create, from identity to fraud to load. The eBay clause on "an unreasonable or disproportionately large load on our infrastructure" speaks to one of them.

How much agentic shopping is there?

Not much, on the evidence The Verge assembled. Uber said it fulfilled only four rides via third-party agents in the third quarter and around 500 Uber Eats orders during the week of Halloween. DoorDash said it fulfilled "several hundred" orders placed via third-party agents, against 993 million total orders in the quarter. PPC Land's arithmetic: several hundred out of 993 million is fewer than one order in a million.

Those figures cut both ways for eBay. A ban costs little in lost sales when agent orders are this rare. Yet the clause was written in January 2026, long before agents carried meaningful volume. One reading, consistent with St. Arromand's statement, is that the concern lies less with current orders than with who controls the buyer relationship if agents ever carry volume: eBay wants to preserve "the trusted end-to-end experience," and it is talking to "potential partners." The "prior express permission" route in the contract is where any such partnership would be written.

What it means for marketers and sellers

For sellers on eBay, the immediate change is visibility, not policy. Listings that consumer agents could read in October may be partially invisible to them in November, while the same listings may surface through mirror sites outside eBay's control. Sales that start in an agent's conversation and finish on eBay would arrive without the on-site path that eBay's search placement and advertising products depend on. The agreement's ranking factors - buyer location, search query, browsing history, price, shipping cost, seller history and "number of listings matching the buyer's query" - assume a human session on eBay.

For agent developers and the brands experimenting with them, eBay's default is closed. Unlike Walmart, eBay has published no agent terms, gateway or identity requirements in its agreement. The human in the loop principle appears only as a negative condition: an end-to-end flow "without human review" is one of the named examples of prohibited automation. The agreement is silent on whether a flow with human review, run by an agent eBay has not approved, is acceptable; the clause's "for any purpose" language suggests it is not, while the spokesperson's account of permitted "agent-assisted navigation" suggests it may be, at least for browsing.

For the advertising market, eBay joins Amazon and, in part, Target among large retailers where agent access is limited by blocks, while Walmart and Shopify have published routes in. PPC Land has tracked the blocking side from Amazon's crawler restrictions in 2025 through the Perplexity litigation and Amazon's Muse block in September 2026. What the eBay case adds is a contract that named the agents in January, nearly ten months before a block on one of them became visible.

What remains unclear

Several questions remain open. eBay has not said which agents, if any, hold prior express permission, nor how a developer or a user would request it. It has not said whether the Muse block was a deliberate decision about Muse, an effect of its general bot defences, or something else; the intermittent access The Verge observed by November 12 fits more than one explanation. The "policies" that the spokesperson cited for permitted AI search and navigation are not reproduced in the User Agreement. Meta has not commented. The Register's January article carried no response from eBay.

Timeline

Summary

Who: eBay, its buyers and sellers, and the makers of AI shopping agents, most visibly Meta, whose Muse agent lost reliable access to eBay listings. eBay spokesperson Sybille St. Arromand commented to The Verge; The Register first reported the contract change.

What: eBay's User Agreement prohibits robots, scrapers and other automated means, "including, without limitation buy-for-me agents, LLM-driven bots, or any end-to-end flow that attempts to place orders without human review," from accessing its services for any purpose without eBay's prior express permission. In November, Muse was blocked from pulling eBay listings, and later got through only some of the time. eBay says it permits some AI search, discovery and agent-assisted navigation and blocks unauthorized scraping, including data collection for model training.

When: eBay posted the agent language on January 20, 2026, according to The Register; it became effective for all users on February 20, 2026, and remains unchanged in the version effective for existing users since June 28, 2026. The Muse block was reported on November 10, 2026, and updated on November 12.

Where: eBay's marketplace, under an agreement published on ebay.com that names contracting entities in the United States, the United Kingdom, the European Union, Canada, India and other countries.

Why: eBay says it takes "a selective approach" to third-party access, is evaluating partnerships, and wants to preserve "the trusted end-to-end experience." The Register pointed to eBay's final value fee and the risk that bots winning auctions drive prices down. For marketers, the case shows that access for shopping agents is being decided by contracts and bot defences before it is decided by deals, with direct consequences for listing visibility and the advertising that depends on human visits.