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.

Visa Publishes TAP; Walmart and McKinsey Document Agentic Commerce Progress

Issue 5October 13–19, 2025Synthesised from 6 sources

Edited by Reviewed against primary sources

Visa published the Visa Trusted Agent Protocol (TAP) this week 1, a credential and authorisation standard for agents operating within the Visa network. TAP defines token formats, delegation scopes, and revocation mechanisms for agent-initiated transactions. Walmart simultaneously opened a ChatGPT-powered checkout feature to US customers 2, the second major retail platform to deploy an agent-initiated purchase flow following ACP Instant Checkout.

McKinsey & Company released a study on agentic commerce adoption 3 documenting answer-engine-optimization (AEO) conversion rate differentials between agent-assisted and standard purchase flows across a sample of retail deployments. The study covers category-level data on which product types see the largest impact from agent-assisted discovery and checkout.

Visa TAP is the third network-layer protocol published in five weeks, following Google’s AP2 4 and the Mastercard Agent Pay APIs 5. Walmart’s deployment runs on the ChatGPT platform, which also hosts ACP Instant Checkout 6; the two features target different entry points — Walmart’s is retailer-initiated via its own product integration, ACP spans any participating merchant.

Three lanes were active in the same week for the first time in the tracking period: Payments (Visa TAP), Pilots (Walmart checkout), and AEO (McKinsey study). The simultaneous activity across protocol publication, live retail deployment, and independent research marks a shift from infrastructure-only weeks.

Events this issue

3 events
AEO
research

McKinsey estimates agentic commerce at $3–5 trillion globally by 2030

Study forecasts up to $1 trillion in US B2C retail and $3–5 trillion globally redirected through agentic commerce by 2030, comparing the shift to the mobile era.

The McKinsey estimate is the first multi-trillion-dollar sizing of agentic commerce from a top-tier consultancy, anchoring later GMV-disclosure events: Shopify's Q1 2026 report of 8x AI-driven traffic and 13x AI-order growth (2026-w19-aeo-shopify-q1-2026-ai-traffic) and Mastercard's Q1 2026 disclosure that Agent Pay reaches nearly all cards globally (2026-w18-payments-mastercard-agent-pay-q1-milestone). The mobile-era comparison is structural rather than predictive — McKinsey maps the funnel-redirection mechanism, not the timeline. The report frames the addressable market that the answer engine optimization (AEO) lane's PayPal, Perplexity, and OpenAI launches (2025-w44-aeo-paypal-agentic-commerce-services, 2025-w47-aeo-perplexity-paypal-instant-buy, 2025-w48-aeo-openai-chatgpt-shopping-research) compete to capture. Publication falls in the same October week as Visa's Trusted Agent Protocol launch (2025-w42-payments-visa-trusted-agent-protocol), bracketing the week with both market sizing and network-level infrastructure.

  1. McKinsey & Company
Payments
spec

Visa introduces Trusted Agent Protocol

Open framework developed with Cloudflare lets merchants verify AI agents and distinguish them from malicious bots; 12 launch partners include Shopify, Stripe, Adyen, and Microsoft.

The Visa Trusted Agent Protocol is Visa's response to the Mastercard Agent Pay launch (2025-w18-payments-mastercard-agent-pay), arriving roughly six months after and co-developed with Cloudflare's edge bot-management infrastructure. The 12-partner roster overlaps with both Stripe-OpenAI's ACP (2025-w40-payments-stripe-openai-acp-instant-checkout) and Google's AP2 (2025-w38-standards-google-ap2-protocol), positioning Visa as a multi-protocol participant. The framework's bot-distinction problem is later quantified by Visa's own PERC threat report (2025-w47-security-visa-perc-fall-2025-threats) and by Google's prompt-injection census (2026-w17-security-google-prompt-injection-empirical-study). TAP becomes the foundation for Visa's Intelligent Commerce Connect on-ramp (2026-w15-payments-visa-intelligent-commerce-connect) and the Agentic Ready production programme in Europe (2026-w11-payments-visa-agentic-ready-europe) and globally (2026-w18-payments-visa-agentic-ready-global). Shopify, Stripe, Adyen, and Microsoft in the launch roster overlap with the Mastercard, OpenAI, and PayPal ecosystems, placing the same processor and merchant set across both card networks.

  1. Visa Newsroom
Pilots
pilot

Walmart partners with OpenAI to enable ChatGPT Instant Checkout

US customers can purchase Walmart and Sam's Club products directly inside ChatGPT via Instant Checkout; Stripe powers payment processing.

Walmart's onboarding makes ChatGPT Instant Checkout the first AI-surface checkout to include a US big-box retailer, extending coverage that previously stopped at Etsy and Shopify merchants (2025-w40-payments-stripe-openai-acp-instant-checkout). Stripe handles the payment leg via Shared Payment Tokens. Five months later Walmart discloses that ChatGPT Instant Checkout converted at roughly a third of Walmart.com's rate (2026-w13-pilots-walmart-chatgpt-conversion-data), prompting OpenAI to retire the merchant-of-record model (2026-w13-aeo-openai-instant-checkout-shutdown) and Walmart to embed its Sparky agent directly inside ChatGPT instead. The pilot is the first data-rich case study of agentic-surface conversion economics in this dataset and informs the brand-native pivot across the AEO lane. Walmart's parallel role as a Universal Commerce Protocol co-launch retailer (2026-w02-standards-google-ucp-launch) places the company across both major AI-commerce protocol stacks.

  1. Walmart Corporate