Agentic commerce FAQ
Short answers to the questions people actually ask about agentic commerce and its standards. Every answer is grounded in primary sources and dated on the relevant standard page.
What is agentic commerce?
Agentic commerce is online commerce where AI agents discover, decide and complete purchases on a person's behalf, instead of the person navigating a storefront themselves.
What are the main agentic commerce standards?
Five open standards: MCP (Anthropic) for connecting agents to tools and data, ACP (OpenAI + Stripe) for product discovery in the current ChatGPT commerce experience, UCP (Google + Shopify) for the full shopping journey on Google surfaces, AP2 (Google) for authorizing agent-led payments, and x402 (Coinbase) for native stablecoin payments over HTTP.
ACP vs AP2 vs MCP: what is the difference?
MCP is the context layer (tools and data). ACP provides commerce specifications and, since March 2026, carries product discovery in ChatGPT; the old native Instant Checkout flow ended. AP2 is a payment-agnostic authorization framework, extends MCP, and has been governed by the FIDO Alliance since 28 April 2026. They address different layers and largely interoperate. See the full comparison.
AP2 vs MCP: are they competitors?
No. AP2 is explicitly designed as an extension of MCP and the A2A protocol.
How do AI agents pay for things?
Through a payment layer: ACP routes orders to the merchant's existing processor (Stripe Shared Payment Token), AP2 authorizes payments across cards, stablecoins and bank transfers, and x402 settles stablecoins on-chain over HTTP.
How can a merchant accept payments from AI agents?
By making checkout and product data agent-ready: use ACP for the current ChatGPT product-discovery path, UCP where Google agentic checkout applies, and AP2 or x402 where their authorization or payment rails fit the use case. Verify each platform’s current integration terms before implementation.
Can you still buy inside ChatGPT?
OpenAI describes merchant checkout and app integrations in its March 2026 announcement. Instant Checkout launched on 29 September 2025. On 24 March 2026 OpenAI announced a focus on product discovery and merchant checkout, citing flexibility limits in the initial version. ChatGPT now focuses on product discovery over ACP, and shoppers complete the purchase on the merchant side or inside a ChatGPT app such as Walmart’s. See what happened to Instant Checkout.
Are these standards open source?
ACP is Apache 2.0, UCP is Apache 2.0, MCP is MIT, x402 is Apache 2.0, and AP2 publishes an open specification. Each is community-oriented and governed openly.
Do Visa and Mastercard support agentic payments?
Yes. Visa runs Visa Intelligent Commerce (with the Trusted Agent Protocol for agent verification) and partnered with OpenAI in June 2026. Mastercard runs Agent Pay and launched Agent Pay for Machines on 10 June 2026. Both use tokenized credentials so agents never handle raw card data. See Visa TAP vs Mastercard Agent Pay.
What is Agent Pay for Machines (AP4M)?
A Mastercard service launched on 10 June 2026 for machine-speed, agent-to-agent payments and microtransactions, with more than 30 partners including Adyen, Coinbase, Stripe and Cloudflare.
Can AI agents pay with stablecoins?
Yes. x402 (Coinbase) settles stablecoins on-chain over HTTP, and MPP (Stripe and Tempo) settles stablecoins or fiat via Shared Payment Tokens. In June 2026 Coinbase and AWS brought x402 to Amazon Bedrock AgentCore Payments and to publishers on AWS CloudFront. See MPP vs x402.
Where can I follow the latest agentic commerce news?
In the analysis section, with a dated timeline on the changelog and sourced figures on the statistics page.