---
title: "Universal Commerce Protocol (UCP) · Sitebulb Labs"
description: "UCP standardises agent-driven commerce interactions."
url: https://labs.sitebulb.com/docs/checks/commerce/ucp/
---

# Universal Commerce Protocol (UCP)

UCP standardises agent-driven commerce interactions.

- Category

  [Commerce](https://labs.sitebulb.com/docs/checks/commerce)

- Standard

  - Emerging checkEmerging
  - Off by default, turn on in settings

## What it checks

UCP aims to give agents one way to browse a catalogue, build a basket, and check out across different merchants.

The extension requests `/.well-known/ucp.json` and `/.well-known/ucp`, in that order, and passes on the first one that returns a non-empty JSON document.

Commerce protocols are new, and most sites have no reason to support them, so absence is **N/A** rather than a failure.

## Results

| Status   | When                                               |
| -------- | -------------------------------------------------- |
| **Pass** | One of the paths returns a non-empty JSON document |
| **N/A**  | Nothing was found                                  |

## How to fix

Publish a UCP descriptor at `/.well-known/ucp.json` to expose your commerce capabilities to agents. Serve it as JSON (`Content-Type: application/json`); the extension only confirms a JSON document is there and does not validate its contents.

These standards are still settling, so follow the protocol’s own documentation for what the descriptor should contain.