--- title: "UCP vs AP2: sourced differences | Agent Ready Checkout" description: "UCP vs AP2: UCP is a commerce protocol with carts, checkout sessions and payment handlers. Verdicts by reader type. Every claim has a source and a read date." canonical: https://agentreadycheckout.com/compare/ucp-vs-ap2 site: "Agent Ready Checkout" last_updated: 2026-11-04 section: "Head-to-heads" --- # UCP vs AP2: sourced differences | Agent Ready Checkout > UCP vs AP2: UCP is a commerce protocol with carts, checkout sessions and payment handlers. Verdicts by reader type. Every claim has a source and a read date. Source: https://agentreadycheckout.com/compare/ucp-vs-ap2 Site: Agent Ready Checkout Last reviewed: 2026-11-04 Head-to-head # UCP vs AP2 In short UCP is a commerce protocol with carts, checkout sessions and payment handlers; AP2 is a payment authorisation layer of signed mandates that UCP lists as a built-in extension. On Stripe the matrix reads UCP live and AP2 no statement found, and the two split on 17 more columns. ## The sourced difference UCP is a commerce protocol with carts, checkout sessions and payment handlers; AP2 is a payment authorisation layer of signed mandates that UCP lists as a built-in extension. UCP checkout is live on Google surfaces; AP2 has no confirmed live surface and moved to FIDO working groups in April 2026. [ucp.dev](https://ucp.dev/), read 4 Nov 2026. ## Verdicts by reader type Head of ecommerce engineering Implement UCP now; treat AP2 as a future field in the payment step. Payments lead AP2 mandates are dispute evidence, not a liability shift. Shopify Plus merchant Nothing to do for AP2 on Shopify today. ## Side by side | Measure | UCP | AP2 | | --- | --- | --- | | Kind | Protocol | Protocol | | Operator | UCP Tech Council (Google, Shopify, Etsy, Target, Wayfair, Amazon, Meta, Microsoft, Salesforce, Stripe and others) | FIDO Alliance (donated by Google, April 2026) | | Homepage | ucp.dev | ap2-protocol.org | | Matrix cells with a stated status | 10 live, 4 pilot, 6 announced | 0 live, 1 pilot, 10 announced | | Published pricing | No pricing statement on file | No pricing statement on file | | A limit worth knowing | Does not move funds: payment runs through the merchant PSP via a payment handler. | Does not carry the payment itself: it wraps cards, x402 or other rails. | | Merchant of record | Merchant | Merchant | | Dispute rules | None in spec | Evidence only | | Live surfaces | Yes | None confirmed | | Cost | No protocol fee | No protocol fee | ## Column by column: where the statuses differ 18 of 27 columns read differently for UCP and AP2 on 4 Nov 2026. | Column | UCP | AP2 | | --- | --- | --- | | Stripe | live | no statement found | | Adyen | pilot | announced | | PayPal | live | announced | | Braintree | live | no statement found | | Coinbase | no statement found | announced | | Crossmint | live | announced | | Shopify | live | announced | | BigCommerce | pilot | no statement found | | Salesforce CC | live | announced | | commercetools | live | no statement found | | WooCommerce | pilot | no statement found | | Amazon | not supported | no statement found | | Walmart | announced | no statement found | | Target | live | no statement found | | Wayfair | announced | no statement found | | Google AI Mode | live | announced | | Meta Muse | announced | no statement found | | Copilot | live | no statement found | | | | 18 differences | | | ## Read the profiles - [Universal Commerce Protocol (UCP)](https://agentreadycheckout.com/protocols/ucp) - [Agent Payments Protocol (AP2)](https://agentreadycheckout.com/protocols/ap2) ## Sources 1. [ucp.dev/](https://ucp.dev/), read 4 Nov 2026 2. [AP2 protocol site](https://ap2-protocol.org/), read 4 Nov 2026 3. [shopify.com/news/ai-commerce-at-scale](https://www.shopify.com/news/ai-commerce-at-scale), read 4 Nov 2026 4. [cloud.google.com/blog/products/ai-machine-learning/announcing-agents-to-payments-ap2-protocol](https://cloud.google.com/blog/products/ai-machine-learning/announcing-agents-to-payments-ap2-protocol), read 4 Nov 2026 5. [AP2 releases](https://github.com/google-agentic-commerce/AP2/releases), read 4 Nov 2026 Last reviewed 4 Nov 2026 ## Edition Matrix edition of 4 Nov 2026. Reviewed 4 Nov 2026, [5 sources](#sources-h). ## Method [How cells, sources and read dates are defined](https://agentreadycheckout.com/method)