Sunday, June 14, 2026

— A weekly publication —

The Agentic Commerce Report

A weekly read of everything that moved in agentic commerce — protocols, payment rails, retailer pilots, regulation. Summarised, sourced, and stitched to what came before.

Google Publishes AP2 Agent-to-Payment Protocol

Issue 2September 15–21, 2025Synthesised from 4 sources

Edited by Reviewed against primary sources

Google published the AP2 protocol specification this week 1, a transport-layer standard defining how agents communicate payment intent to processors without exposing credential material. AP2 specifies a structured message envelope with fields for amount, currency, merchant identifier, and a single-use authorisation token scoped to each transaction.

The specification is designed for cross-processor interoperability, distinguishing it from network-specific implementations. It draws on the tool-calling semantics of the Anthropic Model Context Protocol 2 and the agent-to-agent communication patterns from Google’s earlier A2A framework 3, consolidating both into a commerce-specific message format.

AP2 is the second publicly available agent-payment specification within five months. Mastercard’s Agent Pay APIs 4 provide a network-specific implementation for the Mastercard card network; AP2 targets the layer above network rails where multiple processors may be addressed by a single agent session.

Two agent-payment specifications now exist in public form: Google’s AP2 and Mastercard’s Agent Pay. Both define mechanisms for agents to initiate transactions; neither had published a formal interoperability mapping with the other as of this week.

Events this issue

1 event
Standards
spec

Google launches Agent Payments Protocol (AP2) with 60+ partners

Open payment protocol using cryptographically-signed Mandates to authorise agent-led transactions across credit, debit, stablecoins, and real-time transfers; extends A2A and MCP.

AP2 extends the A2A inter-agent layer (2025-w15-standards-google-a2a) and the MCP tool layer (2024-w48-standards-anthropic-mcp) into payment authorisation, using cryptographically-signed Mandates that record human intent, agent identity, and transaction scope. The 60+ partner roster spans card networks (Mastercard, American Express), processors (Adyen, Worldpay), stablecoin issuers, and real-time payment operators, making AP2 the first agent payment spec with cross-rails coverage. The Mandate model later anchors the FIDO Alliance Agentic Auth working group (2026-w18-standards-fido-agentic-working-groups). AP2 sits beneath the Universal Commerce Protocol (2026-w02-standards-google-ucp-launch) as the payment leg of the full commerce stack and informs Visa's parallel Trusted Agent Protocol (2025-w42-payments-visa-trusted-agent-protocol) released a month later.

  1. Google Cloud Blog