---
title: "UCP Discovery and Commerce Capabilities — citelayer®"
url: "https://citelayer.ai/docs/ucp-discovery/"
date: 2026-02-25
---

# UCP Discovery and Commerce Capabilities

UCP means Universal Commerce Protocol. citelayer® distinguishes the free plugin’s discovery information from the commerce APIs implemented by each paid store add-on.

Check the active capability status
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The free plugin reports available shop capabilities through its discovery surface. Installed, licensed, disabled and available are different states. An inactive or disabled add-on must not be assumed to provide a usable commerce flow.

WooCommerce: documented REST commerce
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WooCommerce Pro exposes catalog browsing/search, stateless cart checks and calculation, signed draft carts, checkout handoff, signed checkout status/cancellation and signed order reads. Start with `/wp-json/citelayer/v1/ucp/capabilities`, `/ucp/openapi.json`, `/ucp/auth` and `/ucp/coverage` under the same REST namespace.

Its `/.well-known/ucp` business profile links the implemented REST contract. Buyer payment takes place at the WooCommerce payment URL.

EDD: a separate feature set
---------------------------

EDD Pro provides download listing/detail/categories/search, stateless cart validation/calculation and a pending-order handoff into the EDD payment flow. WooCommerce’s signed cart/lifecycle/order contract is not part of EDD 1.2.1.

Transport and payment boundaries
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WooCommerce 1.2.19 advertises REST over HTTPS. Its context JSON is discovery, not an MCP JSON-RPC transport. It does not advertise A2A, Embedded Protocol, AP2 mandates or native autonomous payment execution. “Full UCP Support” is explicitly not claimed. See [the REST API reference](/docs/rest-api/) before building a client.

Next step
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Continue with [the quick start checklist](/docs/quick-start/), or [check the common questions](/docs/faq/). For a reproducible problem, send the plugin versions, affected URL, expected result and actual response through [Support](/support/). Do not include passwords, license keys or customer details.

Reviewed 6 October 2026 against citelayer® Free 1.13.5, WooCommerce add-on 1.2.19 and EDD add-on 1.2.1. Features depend on the active components and settings on your site.