https://atamel.dev/tags/ap2/Recent content in AP2 on Atamel.DevHugoenatamel@gmail.com (Mete Atamel)atamel@gmail.com (Mete Atamel)Wed, 04 Nov 2026 09:33:49 +0000https://atamel.dev/posts/2026/11-04_agentic_commerce_protocols_ucp_ap2/Wed, 04 Nov 2026 00:00:00 +0000atamel@gmail.com (Mete Atamel)https://atamel.dev/posts/2026/11-04_agentic_commerce_protocols_ucp_ap2/<p><figure> <img src="https://raw.githubusercontent.com/meteatamel/genai-beyond-basics/main/samples/protocols/images/mcp-a2a-ucp-ap2-a2ui-agui.png" alt="Agent Protocols: MCP, A2A, UCP, AP2, A2UI, AG-UI" /> <figcaption>Agent Protocols: MCP, A2A, UCP, AP2, A2UI, AG-UI</figcaption> </figure></p> <p>In my <a href="https://atamel.dev/posts/2026/03-17_agent_protocols_mcp_a2a_a2ui_agui/">Agent Protocols - MCP, A2A, A2UI, AG-UI</a> post back in March, I provided a high-level overview of the main agent protocols for tool use (MCP), agent-to-agent communication (A2A), and agent-to-UI interactions (AG-UI and A2UI).</p> <p>Recently, I had a chance to explore two newer protocols focused on <strong>agentic commerce</strong> and <strong>payments</strong>: the <a href="https://ucp.dev/">Universal Commerce Protocol (UCP)</a> and the <a href="https://ap2-protocol.org/">Agent Payments Protocol (AP2)</a>. Traditional e-commerce and payment flows assume a human is directly browsing a website and clicking &ldquo;Buy&rdquo; on a trusted checkout screen. When an AI agent shops and pays on your behalf, both the commerce workflow and the cryptographic proof of user authorization need a standard language.</p>