Meta, Stripe, Walmart and others launch joint personal agent protocol amid rival standards

Bret Taylor, the chairman of OpenAI, is leading the protocol, and OpenAI has not joined it ^[6][11]. OpenAI already has a commerce standard: the Agentic Commerce Protocol, co-developed with Stripe and released under Apache 2.0 in September 2025 ^[14]. Stripe also launched the Machine Payment Protocol with Tempo in March 2026 ^[15]. Counting the new group, Stripe is attached to three agent protocols ^[18]. Walmart is in two, because it also sits in the Universal Commerce Protocol with Google, Target, Etsy and Wayfair ^[13][19]. The two reports do not agree on the roster either: CNBC names Meta, Walmart, Stripe and Sierra ^[1][6], while CryptoBriefing lists Meta, Sierra, Genesys, Rocket, Shopify and Walmart ^[9].

So far the money moves through Stripe. Its Link wallet has about 300 million users and about 1 million merchants, and agentic purchases on it rose 38-fold in the month to late September, according to CryptoBriefing ^[20]. That month includes September 8, when Muse launched as the first personal agent wired to Link ^[12][21]. CryptoBriefing did not give the base, so 38-fold may be a small number growing fast. For a payments company, I'd expect the logic of sitting in three protocols to be plain: whichever one wins, the purchase can still settle through Link.

The new protocol is narrower than checkout. Taylor compared it to signing into websites with Google or Facebook credentials, a system he worked on as Facebook's tech chief, and said it would let businesses authenticate bots and see what they do ^[2]. "Companies will know when it's a personal agent versus an actual person. For a lot of companies there's a risk: you don't want just a random bot that isn't acting on behalf of a person to have access to this service," Taylor said ^[7]. He added: "It is kind of chaos until such a standard exists." ^[8]

David Singleton of Meta Superintelligence Labs said agents need customers' card and personal details to work, and that the standard creates some level of visibility and control ^[5]. That puts the protocol at the identity layer, with the Universal Commerce Protocol covering the full agent checkout ^[13] and the Stripe-Tempo protocol covering payment initiation ^[15]. CryptoBriefing calls the set overlapping and competing ^[17]. Or rather, they compete hardest at checkout, where both the Stripe-OpenAI protocol and the Google-backed one sit ^[13][14].

If OpenAI and Anthropic join, as Taylor said he expects ^[11], the protocol could become the identity check under whichever checkout standard a merchant already runs. If they stay out, merchants authenticate agents vendor by vendor. The third outcome is the one Amazon has already picked. It blocks Meta's agents over scraping ^[3], and in November it sued Perplexity, alleging the startup concealed its agents; Perplexity called the suit a "bully tactic" ^[4].

In my view, consumer businesses need an agent policy now, but building it around this one standard runs ahead of the evidence when its own members back rivals ^[18][19]. The counter-case is Muse's reach. It sits at the top of Apple's App Store ahead of ChatGPT ^[10] and has millions of US users, according to Singleton ^[16]. If OpenAI or Anthropic adopt the protocol, the case for planning around one standard is much stronger than I am allowing.