x402

x402 is an internet-native payments protocol that lets services request payment directly in HTTP responses. It uses the HTTP 402 Payment Required status code to signal that a payment is needed before a request can proceed, enabling API monetization and microtransactions.

The standard builds on the semantics of HTTP 402 to enable machine-readable payment flows, often integrating with a payment processor. Specification: x402.org.

Related Terms

API

Application Programming Interface

An API is a set of protocols and tools that allows different software applications to communicate wi...

Microtransaction

A microtransaction is a small-value payment, typically for a digital good or service such as in-app ...

Payment Gateway

A payment gateway is a service that captures and routes payment information from a merchant to a pay...

Payment Processor

A payment processor manages the technical processing of card and electronic payments between merchan...

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