---
name: ucp
title: UCP
category: commerce
---

# UCP

The Universal Commerce Protocol describes catalog, cart, checkout and order services so an agent can transact end to end.

## When to use this skill

Use this when a site fails the "UCP" check and you need to implement it.

## Goal

Enable content payments via Universal Commerce Protocol

## Pass criteria

/.well-known/ucp declares protocol_version and at least one service.

## Implementation

This skill covers the diagnosis. The step-by-step implementation prompt is part
of the paid tier and is served per scan by the API — see https://agent-ready.t0ols.com/llms-full.txt.

## Specifications

- https://ucp.dev/

## Verifying

Re-run the scan against the site and confirm the check reports a pass:

    curl -s https://agent-ready.t0ols.com/api/scan \
      -H 'content-type: application/json' \
      -d '{"url":"https://example.com","enabledChecks":["ucp"]}'