---
name: x402
title: x402
category: commerce
---

# x402

x402 revives HTTP 402 Payment Required as an agent-native payment flow: the server states its price, the client pays, the request completes.

## When to use this skill

Use this when a site fails the "x402" check and you need to implement it.

## Goal

Support x402 protocol for agent-native HTTP payments

## Pass criteria

Payable routes answer HTTP 402 with x402 requirements, or a discovery document is published.

## Implementation

This skill covers the diagnosis. The step-by-step implementation prompt is part
of the paid tier and is served per scan by the API — see https://agent-ready.t0ols.com/llms-full.txt.

## Specifications

- https://www.x402.org/
- https://github.com/coinbase/x402

## Verifying

Re-run the scan against the site and confirm the check reports a pass:

    curl -s https://agent-ready.t0ols.com/api/scan \
      -H 'content-type: application/json' \
      -d '{"url":"https://example.com","enabledChecks":["x402"]}'