---
title: "HTTP 402 Payment Required, defined | Agent Ready Checkout"
description: "HTTP 402 Payment Required: An HTTP status code reserved for payment; x402 and MPP use it to tell a client that a resource has a price."
canonical: https://agentreadycheckout.com/glossary/http-402-payment-required
site: "Agent Ready Checkout"
last_updated: 2026-11-04
section: "Glossary"
---

# HTTP 402 Payment Required, defined | Agent Ready Checkout

> HTTP 402 Payment Required: An HTTP status code reserved for payment; x402 and MPP use it to tell a client that a resource has a price.

Source: https://agentreadycheckout.com/glossary/http-402-payment-required
Site: Agent Ready Checkout
Last reviewed: 2026-11-04

Glossary

# HTTP 402 Payment Required

In short

HTTP 402 Payment Required: An HTTP status code reserved for payment; x402 and MPP use it to tell a client that a resource has a price. The sourced facts on this site do not use HTTP 402 Payment Required outside this entry. Example: MPP standardises HTTP 402 with Challenge, Credential and Receipt messages.

## Definition

An HTTP status code reserved for payment; x402 and MPP use it to tell a client that a resource has a price.

## Example

MPP standardises HTTP 402 with Challenge, Credential and Receipt messages. [mpp.dev](https://mpp.dev/), read 4 Nov 2026.

## Nearby terms

-   [Facilitator](https://agentreadycheckout.com/glossary/facilitator)
-   [Machine Payments Protocol (MPP)](https://agentreadycheckout.com/glossary/machine-payments-protocol-mpp)
-   [x402](https://agentreadycheckout.com/glossary/x402)
-   [All terms](https://agentreadycheckout.com/glossary)

## Sources

1.  [Machine Payments Protocol](https://mpp.dev/), read 4 Nov 2026

Last reviewed 4 Nov 2026

## Edition

Matrix edition of 4 Nov 2026.

Reviewed 4 Nov 2026, [1 sources](#sources-h).

## Method

[How cells, sources and read dates are defined](https://agentreadycheckout.com/method)