Agent Ready CheckoutEdition . The pay layer for agents.

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, read 4 Nov 2026.

Nearby terms

Sources

  1. Machine Payments Protocol, read 4 Nov 2026

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