Amazon started blocking Meta's new Muse shopping agent from its store on the night of Sunday, September 20, less than two weeks after Muse launched. The block is the clearest sign yet that large retailers intend to decide which AI agents can transact on their sites, and on what terms. Other September moves, from Amazon's ChatGPT ad deal to grocery platforms' own assistants, point the same way.
Amazon shuts the door on Muse
Meta launched Muse on September 8 as a personal AI agent that handles multi-step tasks, including shopping, on iOS, Android, the web and WhatsApp (GeekWire, September 2026). Checkout runs through Stripe's Link wallet. At merchants that accept Link, Muse pays with the shopper's saved method. At other merchants, Link issues a single-use virtual card scoped to the approved purchase. Shoppers approve the amount in the chat, and the service is limited to US consumers for now (Stripe, September 8, 2026).
Amazon did not want Muse on its site at all. Shoppers who sent Muse to Amazon got a popup stating that "continued access by an unauthorized AI agent violates Amazon's Conditions of Use" (GeekWire). Amazon told Retail Dive it received no advance notice and did not authorize access. It said third-party apps buying on customers' behalf "should operate openly and respect service provider decisions about whether or not to participate" (Retail Dive, September 22, 2026).
Amazon also said Muse does not identify itself while browsing and appears to capture and store customer credentials. Meta replied that Muse "has no visibility into people's passwords or payment methods" and that shared credentials sit in secure storage the agent uses without seeing them (GeekWire).
Amazon's own record complicates its position. Its Buy for Me feature purchases from other brands' sites, and sellers had to opt out by email rather than opt in (Retail Dive; Tech Times, September 23, 2026). Amazon's distinction is that Buy for Me identifies itself and lets brands opt out (GeekWire). The consent standard it wants from Meta is still stricter than the one it applied to others.
Why Amazon is using its terms, not the courts
Amazon has tried the legal route before. It sued Perplexity over the Comet browser's shopping agent and won a preliminary injunction. On August 4, the Ninth Circuit vacated it (Ninth Circuit opinion, No. 26-1444).
The panel held that under the Computer Fraud and Abuse Act, it is the user, not the AI company, who "accesses" the site when directing an agent through their own browser. It also applied the rule of lenity, warning that the opposite reading could expose individual users to criminal liability (Jones Day, September 2026). The ruling was limited to the record before the court, and the underlying case continues.
The practical result is that federal anti-hacking law may not stop a user-directed agent. Platforms are left with terms of service and technical blocking, which is exactly what Amazon used against Muse. For other retailers weighing the same question, agent detection plus a contractual prohibition is the toolkit that remains.
Amazon wants to be inside the AI assistant, on its terms
While keeping Meta's agent out of its store, Amazon moved into a rival assistant through its ad business. On September 10, Amazon Ads announced a US pilot that lets select advertisers buy ChatGPT Ads through Amazon DSP, with Delta Vacations named as an early participant (Amazon Ads, September 10, 2026). Retail Dive reported that the offering is managed by Amazon's team, includes text, image and product-feed units beneath ChatGPT answers, and is priced on CPC or CPM (Retail Dive, September 11, 2026).
The two moves are consistent. Amazon is willing to be present in third-party AI assistants when it controls the commercial relationship, whether as ad seller or as the agent itself. It objects when someone else's agent sits between it and the customer at checkout.
Grocery platforms keep the agent in-house
Instacart and Shipt both launched shopping assistants on September 9, and both stop short of autonomous purchase. Instacart's Clementine turns conversations, recipes or photos of grocery lists into carts across its US and Canadian marketplace. Customers review and approve the items and complete checkout themselves (Instacart, September 9, 2026). Ask Shipt builds carts from text or meal photos, and Shipt says every recommendation "can be reviewed, swapped, or edited before checkout" (Shipt, September 9, 2026).
Shipt also sells through ChatGPT and Claude (Shipt). The pattern holds: outside assistants are welcome through integrations the platform chooses, while the native assistant keeps the customer relationship and the order data.
Shoppers are not asking for full delegation
Consumer research suggests the cautious design is sensible. An ACI Worldwide survey, fielded by YouGov in June 2026 among 3,328 adults in the UK and US, found that 53% were uncomfortable letting an AI assistant buy on their behalf. Only 7% of fashion shoppers would allow autonomous purchasing under predefined conditions. Price-drop alerts and cross-retailer price comparison each drew 35% interest, against 18% for personalized recommendations (ACI Worldwide, September 16, 2026). ACI sells payments software, so this is vendor-commissioned research, though its findings match the approval-first design choices Instacart, Shipt and Stripe made.
That result cuts both ways for Amazon. If most shoppers want to approve each purchase, the immediate commercial threat from Muse is smaller than the block suggests. The strategic threat, an agent that compares Amazon's price against every other retailer before the shopper ever lands on Amazon, is the part shoppers say they want most.
What to watch
Meta did not respond to Retail Dive's request for comment for its September 22 report. The next signals are whether Meta changes how Muse identifies itself to merchants, whether other large retailers follow Amazon or sign on as Link-accepting merchants, and whether Amazon files suit against Meta. The Perplexity case, which remains ongoing, will show how far terms-of-service enforcement can go when anti-hacking law does not apply.
Sources
- Stripe. "Stripe helps Muse, Meta's new personal AI agent, shop across the internet with Link." 2026. https://stripe.com/newsroom/news/stripe-helps-meta-muse-shop-with-link
- GeekWire. "Amazon blocks Meta's Muse AI assistant in new standoff over agentic shopping." 2026. https://www.geekwire.com/2026/amazon-blocks-metas-muse-ai-assistant-in-new-standoff-over-agentic-shopping/
- Retail Dive. "Amazon asks Meta to remove it from the Muse AI agent experience." 2026. https://www.retaildive.com/news/amazon-meta-muse-ai-agent-shopping-experience/831018/
- Tech Times. "Amazon Blocks Meta Muse Using Standards It Ignores for Its Own Shopping Agent." 2026. https://www.techtimes.com/articles/327940/20260923/amazon-blocks-meta-muse-using-standards-it-ignores-its-own-shopping-agent.htm
- US Court of Appeals for the Ninth Circuit. "Amazon.com Services, LLC v. Perplexity AI, Inc., No. 26-1444." 2026. https://cdn.ca9.uscourts.gov/datastore/opinions/2026/08/04/26-1444.pdf
- Jones Day. "Ninth Circuit Vacates CFAA Injunction Against Perplexity's Comet AI Agent." 2026. https://www.jonesday.com/en/insights/2026/09/ninth-circuit-vacates-cfaa-injunction-against-perplexitys-comet-ai-agent
- Amazon Ads. "Amazon Ads announces new integration with ChatGPT." 2026. https://advertising.amazon.com/library/news/amazon-ads-chat-gpt-advertising-integration
- Retail Dive. "Amazon pilots ad services in ChatGPT: What marketers need to know." 2026. https://www.retaildive.com/news/amazon-pilots-ad-services-chatgpt-what-marketers-need-to-know/830068/
- Instacart. "Meet Clementine, Instacart's AI shopping assistant." 2026. https://company.instacart.com/pressreleases/meet-clementine-instacart-s-ai-shopping-assistant-that-takes-what-s-for-dinner-off-your-plate
- Shipt. "Meet Ask Shipt, Shipt's new AI shopping assistant." 2026. https://corporate.shipt.com/news/meet-ask-shipt-shipt-s-new-ai-shopping-assistant
- ACI Worldwide. "Only 7% of Fashion Shoppers Trust AI to Buy for Them Today." 2026. https://investor.aciworldwide.com/news-releases/news-release-details/only-7-fashion-shoppers-trust-ai-buy-them-today-showing