The Numbers That Matter
Shopify closed Tuesday at $147.74, up $9.82 (+7.12%) on more than 24 million shares, after Meta's Muse AI agent began completing purchases through Shop Pay.
Meta, the company that built the agent, slipped 0.63% to $736.60. Amazon, the company that blocked it, fell 1.34% to $254.98.
Muse logged an estimated 1.8 million U.S. and Canadian iOS downloads in its first 12 days, against 1.3 million for ChatGPT over the same stretch, according to Apptopia.
Shopify's second quarter: revenue of $3.58 billion (+34%), gross merchandise volume of $115.6 billion and free cash flow of $654 million.
The Nasdaq closed at a record 27,244.28 (+0.45%) while the S&P 500 finished flat, down 0.06 points.
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The Agent Needed a Cash Register
Meta spent September building the most talked-about AI app in North America. Muse launched on September 8 in the U.S. and Canada, climbed to No. 1 on the U.S. App Store and, by Apptopia's estimate, reached 2.8 million installs worldwide in 12 days. Meta hasn't released official numbers.
It still couldn't close a sale on its own.
On Monday, Mark Zuckerberg posted on X: "Teaming up with Shopify to make shopping and checkout easier in Muse. Shoppers find more. Shops sell more. More partnerships like this coming soon." Shopify CEO Tobi Lütke described the deal as agentic checkout across every Shopify store. In other words, Muse can now browse a Shopify merchant's site and pay through Shop Pay for the user.
On Tuesday, the market decided who benefits. Shopify rose 7.12%. Twilio, another infrastructure name investors tied to the Muse rollout, gained 6.94% to $284.53, just below its 52-week high. Meta closed lower.
The logic is simple. When a human buys something on a Shopify store, Shopify processes the payment. When an AI agent buys the same thing, Shopify still processes the payment. Deutsche Bank analysts called the deal a sign that major AI platforms are choosing Shopify's infrastructure rather than building their own. Neither company has disclosed financial terms, a revenue split or a rollout timeline, and investors bid the stock up without any of those details.
Amazon Locked the Door
The same weekend, Amazon did the opposite.
Starting Sunday night, anyone using Muse to shop on Amazon.com got a pop-up: "Continued access by an unauthorized AI agent violates Amazon's Conditions of Use, to which our customers have agreed." Amazon told GeekWire it was never told in advance that Muse would access its store. It said the agent doesn't identify itself while browsing and appears to capture customer credentials. The company also said it had asked Meta to remove Amazon from the experience, and Meta declined.
This is a pattern, not a one-off. Amazon sued Perplexity over its Comet browser agent, and a judge sided with Perplexity in August. It has also moved to keep shopping agents from Google and OpenAI off its site. Amazon wants its own storefront, its own recommendations and its own Prime relationship with the customer, with no outside bot in between.
That leaves two different bets on how people will shop when software does the clicking. Amazon is betting the customer stays inside its walls. Shopify is betting the agents come to whoever lets them in. For one session, investors paid for the open door, and the fight between these two giants is already making the risks around Meta and Amazon more expensive to cover.
Why the Business Can Handle the Traffic
Shopify didn't come into this week as a turnaround story. On August 5, it reported second-quarter revenue of $3.583 billion, up 34%. Gross merchandise volume, the total dollar value of goods sold across its merchants, was $115.6 billion, up from $87.8 billion a year earlier. Operating income was $488 million, and free cash flow was $654 million, an 18% margin.
"This was a monster quarter: more than 30% growth in GMV AND revenue AND gross profit AND free cash flow," President Harley Finkelstein said at the time. For the third quarter, the company guided to revenue growth in the low-thirties percent.
Even after Tuesday's jump, Shopify trades well below its 52-week high of $182.19. That gap says investors still aren't sure how much of the agent economy flows through merchant platforms and how much the AI companies keep for themselves.
Where the Tape Closed
The rest of the market spent Tuesday digesting Monday's rally.
S&P 500: 7,764.64, down 0.06 points (flat), still roughly 0.4% below its August 13 record close.
Dow: 51,863.69, down 185.14 (−0.36%). Financials weighed. Charles Schwab fell 6.11% to $100.35, still under pressure from last week's Fed rate hike.
Nasdaq Composite: 27,244.28, up 122.18 (+0.45%), a second straight record close. Micron added 5.00% to $1,096.16 ahead of its September 30 earnings.
VIX: 14.21 (−4.44%). 10-year Treasury: about 4.95%, back under last week's 5% breach.
WTI crude: $95.21 (−0.60%). Oil fell for a fifth straight session after Iran said the Strait of Hormuz could reopen within seven days if the U.S. eases its blockade. Brent briefly traded below $98 before recovering to about $100.
The biggest movers had nothing to do with AI shopping. Viking Therapeutics jumped 35.67% to $40.85 on maintenance data for its obesity drug VK2735. Vicor rose 19.85% to $268.34 after more than doubling its third-quarter sequential growth forecast to over 20%, from roughly 10%, on licensing royalties. Lennar gained 6.38% to $83.06 after Berkshire Hathaway disclosed a purchase of more than 2.7 million shares, a reminder that the Buffett playbook is still being run without Buffett in the chair.
Lab-testing stocks lost ground. Quest Diagnostics fell 4.13% and Labcorp fell 2.94% after the Centers for Medicare & Medicaid Services reported that Medicare pays 16% more for lab services than private insurers do and said it will align most payments with private-sector rates.
What to Watch
Wednesday, 7 p.m. ET: Meta Connect. Zuckerberg delivers the keynote after the closing bell, with a developer session Thursday. New smart glasses are expected, and so are Muse updates. After "more partnerships like this coming soon," any new commerce partner named on stage could move whichever platform gets picked, and could put Shopify's lead to its first test.
Thursday: BlackBerry reports fiscal second-quarter results before the open, and Costco reports fiscal fourth-quarter results after the close. President Xi Jinping's White House visit, with tariffs and AI on the agenda, runs through the end of the week.
The Fed: Policymakers aren't sounding finished. Chicago Fed President Austan Goolsbee has warned that the fight against inflation is "going to be painful," and Boston's Susan Collins has penciled in a second hike this year. If you're still catching up on the September 16 move, here's what the Fed's first hike in three years means from here.
September 30: Micron's earnings, with Wall Street looking for roughly $50 billion in quarterly revenue.
Tuesday's lesson was about where the money lands. Meta may have the most popular new app in the country, but when Muse buys something, the payment runs through Shopify. And one of the biggest stores in the world has decided the agent can't come in.
This article is for informational and educational purposes only and does not constitute investment advice or a recommendation to buy or sell any security.
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