---
title: "Paid: JSON API Schema Check"
method: POST
path: "/api/x402/schema-check"
---

# Paid: JSON API Schema Check

`POST /api/x402/schema-check`

## Request

- Base URL: `https://three.ws`
- URL: `https://three.ws/api/x402/schema-check`
- Auth: none required

three.ws JSON API schema conformance checker — pay $0.001 USDC to fetch a named three.ws public API and validate its response against the declared schema. Surfaces breaking schema changes before users notice a broken feed. Current target: changelog_json — the /changelog.json feed holders and RSS consumers depend on. Returns { valid, version, entry_count, schema_errors }.

## Request body

- object
  - `api` 'changelog_json', required

## Response `200`

three.ws JSON API Schema Check result JSON

## Other responses

- `400`: Validation error
- `402`: Payment Required (x402)

---

[API](https://skmtc.dev/three/apis/three-ws-api.md) · [All operations](https://skmtc.dev/three/apis/three-ws-api/llms.txt) · [OpenAPI document](https://skmtc.dev/three/apis/three-ws-api/revisions/dbc5e3a81b79?raw)