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Protocols

The standards AI agents use to find, buy from and pay a store, and what tragent checks for each.

  • Shared catalogue standardUCP

    The Universal Commerce Protocol. A shared format Google and Shopify use so an agent can read your catalogue and build a basket without scraping your pages.

  • ChatGPT checkoutACP

    The Agentic Commerce Protocol, from OpenAI and Stripe. It is how ChatGPT completes a purchase on your store.

  • Payment authorisationAP2

    The Agent Payments Protocol. It proves a real person authorised the agent to spend, so you are not taking an agent's word for it.

  • Direct tool accessMCP

    The Model Context Protocol. It lets an assistant call your store's own functions directly instead of driving your website.

  • Browser agent checkoutWebMCP

    The Web Model Context Protocol. Your pages tell a browser agent which actions they support — Shopify's get_checkout and complete_checkout, for example — so it calls them instead of guessing at buttons.

  • Agent discoveryA2A

    Agent-to-Agent. It lets other agents find and talk to any agent you publish.