http-402 tag

Publications

Ordered by date created, newest first. Page 1 of 1; 5 publications total.

What is x402? HTTP 402 Payment Required for AI agents and APIs 2026-10-21 · article
x402 is an open protocol that lets software pay for a web request in USDC by answering HTTP 402 Payment Required. How it works, who runs it, who uses it.
How an x402 payment works, step by step: one request, one payment 2026-09-29 · article
A single x402 payment in five steps: the 402 response, the signed EIP-3009 authorization, facilitator verify and settle, and the receipt. Version 2 headers.
The x402 Economy: a book sold for $9 in USDC over HTTP 402 2026-09-29 · article
The x402 Economy is a 63-page book on HTTP 402 and the x402 market, sold for $9 in USDC through the protocol it explains. Contents and how to buy.
What does HTTP 402 Payment Required mean? A history of the web's unused code 2026-09-29 · article
HTTP 402 Payment Required was reserved in the web's standard in the 1990s and left unused for decades. Its history, why micropayments failed, and what changed.
x402 glossary: 44 terms for HTTP 402, agent payments and USDC 2026-09-29 · page
Plain definitions of x402, HTTP 402, facilitator, EIP-3009, CAIP-2, USDC, MCP, A2A, AP2, MPP, L402, calls per payer and more, each with its first-use context.