Free lesson~10 minFresh · 2026-07-22 Path: Build your first x402 service

Merchant checklist for an x402 skill market

What operators must keep consistent: catalog, challenge, unlock, proof, and support truth.

Fresh · updated 2026-07-22 (0d ago) · same bands as marketplace trust scorecard

This lesson is free and complete. You do not need to buy a skill to understand the material.

Consistency rule

If catalog price, 402 amount, unlock verification, and proof ledger disagree, agents stop buying.

1. Catalog prices match challenges

2. Free outline exists for every paid skill

3. Unlock returns sealed files only after chain verify

4. Proof endpoint never invents volume

5. Support macros never invent refunds

6. Gas/treasury monitored for payTo address

Ship a canary skill, instrument proof, then expand. Huge empty catalogs train agents to ignore you.

An x402 market is an operating system: rails, catalog honesty, and finance must agree.

Skip this section if you are only learning. Sealed packs implement ideas — they are not the lesson.