Resources
Official AP2 resources
AP2 repositorygithub.com/google-agentic-commerce/AP2The open source AP2 project created by Google, with its samples and SDK. v0.2.0 is the latest tagged version; we validate against it.AP2 specification (v0.2.0)github.com/google-agentic-commerce/AP2/blob/v0.2.0/docs/ap2/specification.mdThe roles, the Checkout and Payment Mandates, mandate versioning, and its compatibility with UCP.UCP AP2 Mandates Extensionucp.dev/2026-08-25/specification/payment/extensions/ap2-mandatesUCP's own specification of how AP2 is advertised and used within UCP: the primary source for most of the rows this checker runs.AP2 FAQ (v0.2.0)github.com/google-agentic-commerce/AP2/blob/v0.2.0/docs/faq.mdIncluding how AP2 relates to UCP, and its description as similar to the A2A protocol.Contributing guidegithub.com/google-agentic-commerce/AP2/blob/main/CONTRIBUTING.mdNotes that the core specification has been donated to FIDO and that contributions to this repo are now to the samples and SDK.
Research & industry sources
commercetools – AI trends shaping agentic commercecommercetools.com/blog/ai-trends-shaping-agentic-commerce73% of consumers are already using AI in their shopping journey.Accenture – Agentic commerce and the future of paymentswww.accenture.com/au-en/blogs/banking/agentic-commerce-payments$3.1 trillion of online commerce will run through AI agents by 2030 – more than 30% of all online commerce – per Accenture.
Validate other agentic protocols
UCP Checkwww.ucpcheck.orgFree validator for Universal Commerce Protocol.ACP Checkwww.acpcheck.orgFree validator for Agentic Commerce Protocol.ONX Checkwww.onxcheck.orgFree validator for Order Network eXchange.MCP Checkwww.mcpcheck.orgFree validator for Model Context Protocol.A2A Checkwww.a2acheck.orgFree validator for Agent2Agent Protocol.ARD Checkwww.ardcheck.orgFree validator for Agentic Resource Discovery.