https://agenticcommerceprotocol.info/changelog Dated timeline of agentic commerce standards (ACP, AP2, MCP, x402), each entry sourced. en Wed, 10 Jun 2026 21:06:43 GMT https://github.com/agentic-commerce-protocol/agentic-commerce-protocol https://github.com/agentic-commerce-protocol/agentic-commerce-protocol#2026-04-17 Fri, 17 Apr 2026 00:00:00 GMT The ACP specification adds cart, feed, orders, authentication and MCP support. https://github.com/Universal-Commerce-Protocol/ucp/releases/tag/v2026-04-08 https://github.com/Universal-Commerce-Protocol/ucp/releases/tag/v2026-04-08#2026-04-08 Wed, 08 Apr 2026 00:00:00 GMT The Universal Commerce Protocol publishes specification release v2026-04-08 on GitHub, its third release. https://stripe.com/blog/machine-payments-protocol https://stripe.com/blog/machine-payments-protocol#2026-03-18 Wed, 18 Mar 2026 00:00:00 GMT Tempo and Stripe launch MPP, an open standard for programmatic agent payments over HTTP, in stablecoins and fiat via Shared Payment Tokens. https://github.com/agentic-commerce-protocol/agentic-commerce-protocol https://github.com/agentic-commerce-protocol/agentic-commerce-protocol#2026-01-30 Fri, 30 Jan 2026 00:00:00 GMT The ACP specification releases version 2026-01-30 with extensions, discounts and payment handlers. https://github.com/agentic-commerce-protocol/agentic-commerce-protocol https://github.com/agentic-commerce-protocol/agentic-commerce-protocol#2026-01-16 Fri, 16 Jan 2026 00:00:00 GMT The ACP specification releases version 2026-01-16 introducing capability negotiation. https://blog.google/products/ads-commerce/agentic-commerce-ai-tools-protocol-retailers-platforms/ https://blog.google/products/ads-commerce/agentic-commerce-ai-tools-protocol-retailers-platforms/#2026-01-11 Sun, 11 Jan 2026 00:00:00 GMT Google launches the Universal Commerce Protocol, co-developed with Shopify, Etsy, Wayfair, Target and Walmart and endorsed by 20+ organizations. Apache 2.0, compatible with A2A, AP2 and MCP. https://github.com/agentic-commerce-protocol/agentic-commerce-protocol https://github.com/agentic-commerce-protocol/agentic-commerce-protocol#2025-12-12 Fri, 12 Dec 2025 00:00:00 GMT The ACP specification releases version 2025-12-12 with fulfillment enhancements. https://www.linuxfoundation.org/press/linux-foundation-announces-the-formation-of-the-agentic-ai-foundation https://www.linuxfoundation.org/press/linux-foundation-announces-the-formation-of-the-agentic-ai-foundation#2025-12-09 Tue, 09 Dec 2025 00:00:00 GMT Anthropic donates MCP to the Agentic AI Foundation under the Linux Foundation, co-founded with Block and OpenAI. https://usa.visa.com/about-visa/newsroom/press-releases.releaseId.21716.html https://usa.visa.com/about-visa/newsroom/press-releases.releaseId.21716.html#2025-10-14 Tue, 14 Oct 2025 00:00:00 GMT Visa publishes TAP, developed with Cloudflare: cryptographic verification of trusted AI agents at checkout, built on HTTP Message Signatures (RFC 9421). https://openai.com/index/buy-it-in-chatgpt/ https://openai.com/index/buy-it-in-chatgpt/#2025-09-29 Mon, 29 Sep 2025 00:00:00 GMT Instant Checkout launches in ChatGPT, powered by the Agentic Commerce Protocol (Apache 2.0), starting with Etsy sellers. https://cloud.google.com/blog/products/ai-machine-learning/announcing-agents-to-payments-ap2-protocol https://cloud.google.com/blog/products/ai-machine-learning/announcing-agents-to-payments-ap2-protocol#2025-09-16 Tue, 16 Sep 2025 00:00:00 GMT Google announces the Agent Payments Protocol with 60+ organizations, designed as an extension of A2A and MCP. https://developers.googleblog.com/en/google-cloud-donates-a2a-to-linux-foundation/ https://developers.googleblog.com/en/google-cloud-donates-a2a-to-linux-foundation/#2025-06-23 Mon, 23 Jun 2025 00:00:00 GMT Google donates the Agent2Agent protocol to the Linux Foundation; the project is founded with AWS, Cisco, Google, Microsoft, Salesforce, SAP and ServiceNow. https://www.coinbase.com/developer-platform/discover/launches/x402 https://www.coinbase.com/developer-platform/discover/launches/x402#2025-05-06 Tue, 06 May 2025 00:00:00 GMT Coinbase launches x402, native stablecoin payments over HTTP via the 402 status code, with AWS, Anthropic, Circle and NEAR. https://www.mastercard.com/global/en/news-and-trends/press/2025/april/mastercard-unveils-agent-pay-pioneering-agentic-payments-technology-to-power-commerce-in-the-age-of-ai.html https://www.mastercard.com/global/en/news-and-trends/press/2025/april/mastercard-unveils-agent-pay-pioneering-agentic-payments-technology-to-power-commerce-in-the-age-of-ai.html#2025-04-29 Tue, 29 Apr 2025 00:00:00 GMT Mastercard unveils its agentic payments program built on Mastercard Agentic Tokens, with Microsoft, IBM, Braintree and Checkout.com as announced collaborators. https://developers.googleblog.com/en/a2a-a-new-era-of-agent-interoperability/ https://developers.googleblog.com/en/a2a-a-new-era-of-agent-interoperability/#2025-04-09 Wed, 09 Apr 2025 00:00:00 GMT Google announces the Agent2Agent protocol for agent-to-agent communication, with support from more than 50 technology partners. https://anthropic.com/news/model-context-protocol https://anthropic.com/news/model-context-protocol#2024-11-25 Mon, 25 Nov 2024 00:00:00 GMT Anthropic open-sources the Model Context Protocol, the context layer for connecting agents to tools and data.