FIELD GUIDES

Understand the system.
Use it responsibly.

Practical explanations for people building, buying, and selling agent services.
01 · PLAIN-ENGLISH EXPLAINER

What is x402?

A plain-English guide to x402 payments: how AI agents pay for one API request at a time using HTTP 402 and USDC.

Read guide →02 · AGENT PAYMENT SAFETY

How should an AI agent verify an x402 payment?

A practical preflight checklist for AI agents making x402 USDC payments on Base: funding, network, price, recipient, and signing safety.

Read guide →03 · X402 MERCHANT GUIDE

Why is my x402 API not selling?

Diagnose weak x402 API sales by checking marketplace discovery, buyer-search language, pricing, payment reliability, and independent demand.

Read guide →