---
title: "Commerce · Sitebulb Labs"
description: "Explore checks for agent commerce protocols, including ACP, UCP, x402 and MPP, and learn how agents may discover payment or purchase options."
url: https://labs.sitebulb.com/docs/checks/commerce/
---

# Commerce

Explore checks for agent commerce protocols, including ACP, UCP, x402 and MPP, and learn how agents may discover payment or purchase options.

These checks look for the protocols that let an agent pay for something or complete a purchase. The standards are all new and still settling, so every check here is an **emerging bonus** check: off by default, and when turned on, able to add points but never to lower a score.

When nothing is found the result is **N/A**, not a failure. An ordinary site that does not sell to agents is not penalised.

## Checks in this category

- Emerging check[**x402 payments**](https://labs.sitebulb.com/docs/checks/commerce/x402)\
  The x402 standard uses HTTP 402 to let agents pay for resources programmatically.
- Emerging check[**Merchant Payment Protocol (MPP)**](https://labs.sitebulb.com/docs/checks/commerce/mpp)\
  MPP exposes merchant payment capabilities to agents.
- Emerging check[**Universal Commerce Protocol (UCP)**](https://labs.sitebulb.com/docs/checks/commerce/ucp)\
  UCP standardises agent-driven commerce interactions.
- Emerging check[**Agentic Commerce Protocol (ACP)**](https://labs.sitebulb.com/docs/checks/commerce/acp)\
  ACP lets agents complete purchases on a person's behalf.