Y Combinator Founder Paul Graham: Amazon Blocks Agents, Opening Opportunities for Startups
Y Combinator founder Paul Graham stated that Amazon's ban on external agents presents the first opportunity for startups to compete since Amazon's inception. He believes that people will want agents to shop on their behalf, which could become a primary use case, and they will be reluctant to use Amazon's own agents.
The post did not provide product solutions, only defining the ban as a vacancy. The background is that Amazon cut off Meta's Muse from shopping access to amazon.com around September 21. Muse, launched on September 8, can open browsers, fill out forms, and check out after authorization, providing up to $1,000 in coverage for damages, losses, and price drops. Amazon claimed it requested Meta to exclude the site, which was refused; subsequently, Muse accessed the store, scraped and saved login credentials without indicating its agent status, continuing access that was deemed a violation of the terms of use agreed upon by users.
The block list is not limited to one entity. Amazon's site rules and crawler files mark ChatGPT, Claude, Copilot, Perplexity, Grok, and Google's AI crawlers as prohibited. The company also retains its own shopping AI, Alexa, which can add items and make purchases on third-party websites. CEO Andy Jassy mentioned in a earnings call that the company is in talks with companies looking to run commercial agents.
The legal line has already been drawn. Amazon sued Perplexity last November, accusing its browser Comet of shopping on-site using customers' own accounts; it obtained a preliminary injunction in March, but on August 4, the Ninth Circuit Court ruled that the anti-hacking claim was unlikely to succeed and lifted the injunction, stating that it was the user, not the AI company, accessing the computer. A request for rehearing on September 10 was denied. Elon Musk stated that if user IP and cookies are used, Amazon cannot distinguish whether the buyer is a person or an agent.
The advertising account explains why the gatekeeping is necessary. Amazon's retail profits are thin, while advertising revenue exceeded $68 billion last year, relying on people browsing pages rather than agents jumping directly to checkout. Third-party agents bypass search positions, recommendation spots, and sponsored products, effectively removing advertising inventory from the purchasing path. Graham's judgment is that users want agents on their side, not agents sent by the store owner.
This is an event-driven battle for entry. Buyers are consumers and agent developers who want to delegate price comparison and ordering to external agents, while sellers are Amazon, which guards accounts, pages, and advertising spots. Beneficiaries are new entry points that can complete purchases legally without being controlled by a single retailer; those under pressure are advertisements that rely on in-site browsing for monetization, as well as agents from Meta, OpenAI, Google, and Perplexity that have been specifically blocked. Funds have not yet moved away from Amazon's product sales, but the pricing power of purchasing actions has shifted from the shelves to the agents.
Source: Public Information
ABAB AI Insight
Paul Graham founded Y Combinator in 2005, with early batches including Airbnb, Dropbox, and Stripe, which emerged from gaps overlooked by incumbents. His public judgments typically focus on actions where incumbent platforms deny users, rather than on feature lists. Amazon, founded by Jeff Bezos in 1994 as an online bookstore, later closed its shelves using Prime, fulfillment networks, and advertising; Graham notes this is the first time since its founding that he sees a similar vacancy, referring to how this cycle has kept purchasing agents out.
Capital will bypass the blocked pages to buy account relationships and fulfillment. If agents cannot access amazon.com, startups will need to manage brand inventory, independent site checkouts, and payment credentials themselves, or create authorization interfaces that Amazon is unwilling to open. Meta has already added a $1,000 loss guarantee on Muse to build trust for users handing money to agents. While Amazon blocks external agents, it allows Alexa to make purchases on other websites, indicating it wants to control buyer relationships, not oppose the act of purchasing on behalf of others. Jassy has publicly stated that the company is in talks with commercial agent companies, leaving negotiations for revenue sharing, not a technical void.
A comparison can be made to Microsoft blocking Netscape from system entry during the browser wars, leaving not another browser, but a new entry point that later grew through search and plugins. A closer example on the retail side is Shopify separating independent sites from Amazon's shelves, relying on merchants' unwillingness to share customer lists. The current phase is one of control: Amazon uses terms, crawler prohibitions, and litigation to guard accounts, while the Ninth Circuit has extracted "user-authorized access" from the hacker narrative, and the injunction has not held.
Structurally, this represents a shift in pricing power. In the past, prices were determined by search rankings, sponsored products, and page dwell time; last year's $68 billion in advertising reflects this mechanism's billing. Agents compress the path to "price comparison followed by direct ordering," eliminating browsing, and thus advertising space loses its pricing basis. Whoever holds the user's purchasing directive can reprice the shelves; agents sent by store owners cannot retain this directive because buyers want an opposing party to select on their behalf.
ABAB News · Cognitive Laws
The day a platform blocks entry is the founding day of its competitor.
Agents from store owners cannot earn buyers' trust.
Once browsing is skipped, advertising space loses pricing power.