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Stripe and OpenAI release the Agentic Commerce Protocol with Instant Checkout

On 29 September 2025 Stripe announced that it powers Instant Checkout in ChatGPT and released the Agentic Commerce Protocol, co-developed with OpenAI. US ChatGPT users could buy from US Etsy businesses in-chat, with Shopify merchants described as coming soon. ACP is a merchant checkout-session standard, not Coinbase x402.