Four agent payment standards mapped: x402, AP2, ACP, UCP — and OpenAI's pivot
lilyraynyc · x · 2026-11-06
Another slide from Darwin Santos's Tech SEO Connect talk maps four agent payment protocols: Coinbase's x402 (per-request stablecoin payments), Google's AP2 (signed mandates), OpenAI+Stripe's ACP (agent places orders, merchant of record stays), and Google's UCP with Shopify/Etsy (one standard for discovery to post-purchase) — plus the March 2026 shift as OpenAI moves to merchant-owned checkout and ACP adjusts.
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