5 Checkout Standards, 3% Adoption: The Protocol Proliferation Tax Killing Agent Commerce

AI agents excel at product discovery, but they struggle to close the deal. While 132 million U.S. adults have used AI to assist in a retail purchase, according to PYMNTS Intelligence, the actual conversion rate for these autonomous systems remains stuck. Only 3% of transactions currently involve agents, revealing a massive chasm between finding an item and completing the purchase. The bottleneck is the proliferation of competing checkout protocols. With Black Friday 10 weeks away and Visa forecasting millions of AI agent purchases by holiday season, merchants face5+ competing standards – Visa IC, Mastercard Agent Pay/Connect, Stripe ACP/SPT, Google UCP/AP2, Meta Muse – while only 3% of transactions involve agents.