Standards & Interoperability

A brief guide to using X402 for streamlined AI agent billing and payments.

An overview of real-world use cases for AI agents using X402 payments.

A quick guide to integrating X402, covering setup basics and key implementation steps.

x402 is doing something very useful and at the same time simple : resurrecting HTTP 402 Payment Required as a standard way for machines to ask for payment and then retry the same HTTP request with proof of payment. The result is an internet-native payment handshake that works for APIs, AI agents, and micro-services—without accounts, API keys, or subscription checkout flows.

AI agents today can research, negotiate, and collaborate, but when it comes to handling payments, everything suddenly becomes messy.