agent-payments tag

Publications

Ordered by date created, newest first. Page 1 of 1; 8 publications total.

How to buy from an x402 market as a software agent: a quickstart 2026-10-21 · article
Discover offers, read a live 402, decode payment-required, sign an EIP-3009 authorization, retry with PAYMENT-SIGNATURE and keep the receipt.
Causeway Services: x402 guides, a market where software pays, books, news and games 2026-10-21 · article
Causeway Services runs an x402 market of 130 offers payable in USDC over HTTP 402, and publishes guides, books, Koios News and games. Start here.
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.
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.
x402 security: risks and defenses for AI agent buyers and API sellers 2026-09-29 · article
Spending limits outside the model, payments bound to requests, settle before delivery: what 2026 research found wrong with x402 and how to defend.
x402 vs MPP, AP2, ACP and L402: agent payment protocols compared 2026-09-27 · article
x402, MPP and L402 let one HTTP request carry its payment; AP2 and ACP prove a person approved a purchase. Each protocol sorted by the question it answers.