Changelog Openapi — x402-gateway

Diff two OpenAPI specs and generate a structured breaking-change changelog. Deterministic, no LLM. Provide base_spec_url and new_spec.

Try it (x402 payment flow)

⚡ Try with your wallet — live payment

curl -X POST https://x402.freeq.one/tools/changelog_openapi \ -H "Content-Type: application/json" \ -d '{"base_spec_url": "https://example.com/openapi-v1.json", "new_spec": {"openapi": "3.1.0", "info": {"title": "v2"}, "paths": {}}}'

Without payment, the server returns 402 Payment Required with x402 challenge details. A paying agent signs a USDC transaction on Base and retries with the payment header.