VercatusAgentic commerce protocol OpenAI
OpenAI's Agentic Commerce Protocol (ACP), open-sourced on 29 September 2025 with Stripe and maintained by OpenAI and Stripe (beta, date-versioned; latest stable spec 2026-04-17), has three parts: product feeds for discovery, the Agentic Checkout spec (checkout endpoints the merchant hosts) and the Delegated Payment spec; the merchant stays merchant of record. It launched with Instant Checkout for US Etsy sellers. On 24 March 2026 OpenAI said the initial Instant Checkout did not offer the flexibility it wanted, let merchants use their own checkout experiences (or a ChatGPT app, such as Walmart's) and refocused on product discovery, extending ACP to carry product feeds and promotions; Target, Sephora, Nordstrom, Lowe's, Best Buy, The Home Depot and Wayfair had integrated for discovery, and Shopify merchants are covered through Shopify Catalog. Microsoft adopted ACP for Copilot Checkout (8 January 2026, US).
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- 4Microsoft Advertising · 2026Conversations that convert: Copilot Checkout and Brand Agentsabout.ads.microsoft.com
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