---
title: "UCP | UCP universal commerce protocol well-known | Agent-Ready Check"
description: "The Universal Commerce Protocol describes catalog, cart, checkout and order services so an agent can transact end to end. Pass criteria: /.well-known/ucp declares protocol_version and at least one service."
locale: en
canonical: https://agent-ready.t0ols.com/checks/ucp/
---

# UCP

> Category: Commerce

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

## Why it matters

It is the difference between an agent recommending your product and an agent buying it.

## Pass criteria

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

## How to implement it

Goal: Enable content payments via Universal Commerce Protocol

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

The step-by-step implementation prompt is part of the paid tier. The free layer gives you the diagnosis, the evidence and the specification links.

Specifications: https://ucp.dev/
Implementation notes: https://agent-ready.t0ols.com/.well-known/agent-skills/ucp/SKILL.md