Home / The rules behind the transaction. Agentic Commerce Wiki / Living reference
The rules behind the transaction. Eight protocol and framework records. Clear layers, current sources and explicit limits.
Commerce · Payment · Transport · Agent coordination · Identity / trust · Framework. A released specification does not establish a live merchant integration.
Find an entry Stack layerAll layers Commerce Identity & trust Payments Transport Agent coordination Framework EvidenceAll evidence states Primary source available Evidence missing
Comparison modeprotocol Restore shortlist
8 protocol entries · Alphabetical order · Checked 28 Sep 2026
AP A protocol for expressing and verifying authority for agent-performed payments.
Specification state: public-preview · 0.2.0
Read evidence → Compare + A2 A standard for communication and task coordination between agents.
Specification state: live · 1.0.1 repository release / 1.0.0 specification banner — scope unresolved
Read evidence → Compare + AC A commerce interaction standard connecting businesses, buyers and their agents.
Specification state: public-preview · 2026-04-17 · repository identifies specification as beta
Read evidence → Compare + EM A draft framework for card-based agentic payments and future specification work.
Specification state: draft · 1.0 DRAFT
Read evidence → Compare + MP A payment protocol for machine consumption of web services.
Specification state: draft · draft-httpauth-payment-01 · normative core; broader SDK/method versions separate
Read evidence → Compare + MC A standard interface connecting applications to tools, resources and prompts.
Specification state: live · 2026-07-28
Read evidence → Compare + UC A common model for agents and businesses to negotiate commerce capabilities.
Specification state: live · 2026-08-25
Read evidence → Compare + x4 An internet payment standard built around HTTP payment negotiation.
Specification state: live · 2
Read evidence → Compare +