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?
Four open standards: MCP (Anthropic) for connecting agents to tools and data, ACP (OpenAI + Stripe) for agent checkout, 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 completes a purchase and powers ChatGPT Instant Checkout. AP2 is a payment-agnostic authorization framework and extends MCP. 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 agent-ready: adopting ACP to sell inside ChatGPT (one line of code for Stripe merchants), and/or supporting AP2 or x402 depending on the surface and payment type.
Is buying in ChatGPT live?
Yes. Instant Checkout launched in ChatGPT on 29 September 2025 for US users, starting with Etsy sellers, with Shopify merchants announced as coming soon.
Are these standards open source?
ACP 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.