Changelog and timeline
The milestones that shaped the agentic commerce standards, newest first. Each entry links to its primary source.
The Universal Commerce Protocol adds multi-vertical foundations, grocery and location capabilities, 3DS2 flows, payment schedules, split payments, granular consent and loyalty support. The release includes breaking schema changes.
Primary source →AWS makes AgentCore Payments generally available with support for x402 and MPP, session spending caps, expiry controls and transaction observability.
Primary source →The Model Context Protocol moves to a stateless request and response core and adds header-based routing, cache hints, authorization hardening, Multi Round-Trip Requests and a formal extensions framework.
Primary source →Shopify's Spring 2026 Edition removes the approval requirement to build on its agentic commerce layer, exposes a public MCP endpoint, ships a UCP Skill and expands the Catalog API for agent discovery.
Primary source →Adyen ships Adyen Agentic, a modular API suite (Agentic Feed, Agentic Cart, Agentic Payments) so merchants can sell across AI platforms from one integration; early partners include American Express, Mastercard, Salesforce and Visa.
Primary source →Coinbase and AWS announce that publishers using AWS CloudFront and WAF can charge AI agents per request through x402, initially settling in USDC on Base.
Primary source →At Mastercard Connections, Mastercard introduces Agent Pay for Machines, a service to permission, orchestrate and settle machine-speed agent-to-agent payments and microtransactions, with more than 30 launch partners including Adyen, Coinbase, Stripe, Cloudflare, Getnet by Santander, OKX and Tempo.
Primary source →Visa and OpenAI announce a strategic collaboration to enable tokenized Visa payments initiated by agents inside OpenAI experiences, with spending limits and merchant-category controls, under Visa Intelligent Commerce.
Primary source →Visa announces Agent Score (agentic-readiness scoring for merchant sites), an Agentic Directory (agent trust registry), a Large Transaction Model, plus stablecoin settlement and token enhancements under Visa Intelligent Commerce.
Primary source →Hey Savi launches the UK's first agentic commerce experience with native in-app checkout powered by PayPal's Agentic Commerce Services; Debenhams Group (Debenhams, Karen Millen, Boohoo, Pretty Little Thing) is the first UK retail adopter.
Primary source →At Money20/20, Worldline and ING complete Europe's first end-to-end agent-initiated payment in production, on the Mastercard network, with consumer approval and ING as issuer.
Primary source →At Open Source Summit North America 2026, Google's UCP team presents the Universal Commerce Protocol's layered model (services, capabilities, extensions; REST, MCP and A2A transports) and cites Bain's forecast that agentic shopping could reach 10 to 25 percent of US e-commerce by 2030.
Primary source →Google transfers ownership of the Agent Payments Protocol to the FIDO Alliance to keep it platform-agnostic and community-led, and releases AP2 v0.2 with Human Not Present payments for autonomous, pre-authorized transactions. Verifiable Intent, co-developed with Mastercard, is also donated to FIDO.
Primary source →The ACP specification adds cart, feed, orders, authentication and MCP support.
Primary source →The Universal Commerce Protocol publishes specification release v2026-04-08 on GitHub, its third release.
Primary source →OpenAI ships richer product discovery in ChatGPT powered by ACP (feeds and promotions, delivered directly or through Salesforce and Stripe), and lets merchants use their own checkout, saying the initial Instant Checkout did not offer the flexibility it wanted. Target, Sephora, Nordstrom, Lowe's, Best Buy, The Home Depot and Wayfair are named as integrated for discovery; Walmart ships an in-ChatGPT app.
Primary source →Tempo and Stripe launch MPP, an open standard for programmatic agent payments over HTTP, in stablecoins and fiat via Shared Payment Tokens.
Primary source →The ACP specification releases version 2026-01-30 with extensions, discounts and payment handlers.
Primary source →The ACP specification releases version 2026-01-16 introducing capability negotiation.
Primary source →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.
Primary source →The ACP specification releases version 2025-12-12 with fulfillment enhancements.
Primary source →The Linux Foundation names MCP as a founding technical contribution to the Agentic AI Foundation, alongside Block’s goose and OpenAI’s AGENTS.md.
Primary source →Visa publishes TAP, developed with Cloudflare: cryptographic verification of trusted AI agents at checkout, built on HTTP Message Signatures (RFC 9421).
Primary source →Instant Checkout launches in ChatGPT, powered by the Agentic Commerce Protocol (Apache 2.0), starting with Etsy sellers.
Primary source →Google announces the Agent Payments Protocol with 60+ organizations, designed as an extension of A2A and MCP.
Primary source →Google donates the Agent2Agent protocol to the Linux Foundation; the project is founded with AWS, Cisco, Google, Microsoft, Salesforce, SAP and ServiceNow.
Primary source →Coinbase launches x402, native stablecoin payments over HTTP via the 402 status code, with AWS, Anthropic, Circle and NEAR.
Primary source →Mastercard unveils its agentic payments program built on Mastercard Agentic Tokens, with Microsoft, IBM, Braintree and Checkout.com as announced collaborators.
Primary source →Google announces the Agent2Agent protocol for agent-to-agent communication, with support from more than 50 technology partners.
Primary source →Anthropic open-sources the Model Context Protocol, the context layer for connecting agents to tools and data.
Primary source →Latest documented event: .