Agent-Mediated Discovery & Commerce

• What it is: the transaction layer and its plumbing for AI agents — everything that happens after an agent (the buyer's or a seller's) crosses the line from "found you" to "bought from you": how a merchant becomes transactable, how the purchase is authorized/paid/settled, who is merchant-of-record, the supply-side work to be selected by an agent, and agent-to-agent (A2A) negotiation. Discovery stays in E; paid agent placement stays in F; both hand off into L at the transaction boundary.
• The 2026 shift: the category is shipping and reversing in the same quarter. A flagship native checkout (OpenAI's in-chat Instant Checkout) launched and was pulled within weeks (launched 2026-02-16, native checkout discontinued 2026-03-24, ledger); the protocols, rails, and standards bodies underneath persist and are consolidating (AP2→FIDO, A2A/x402→Linux Foundation).
• The hard truth: real US consumer agent-commerce volume is small and the numbers disagree by definition; the strongest live volume is Chinese super-app (Alipay ~120M agent transactions in one week, Feb 2026, ledger). The US "protocol-negotiated, merchant-bears-the-risk" framing is jurisdiction-specific — don't mistake it for the world.
• Don't: bet the playbook on one surface's current state, over-integrate to five protocols when a PSP "universal translator" abstracts them, treat A2A negotiation as production because A2A-the-protocol is, or quote a single agent-commerce market-size number without its definition.

How this domain is organized internally — and the decision logic, runnable workflows, and agent angle — are in the full map.

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