OpenAPI Changelog Generator
OpenAPI Changelog Generator: Diff two OpenAPI specs and generate a structured breaking-change changelog (no LLM — deterministic diff). Provide base_spec_url and new_spec. Pay per call in USDC on Base via x402 — POST https://x402.freeq.one/tools/changelog_openapi.
Answeringour last check, 2026-09-24
1 of 1checks answered this week
926 msmedian answer time
$0.005listed price per call
$0.005price it asked us
Paid test badge: not yet. The checks above are free: we call the tool without paying and read the payment request it sends back. The Verified badge needs paid calls whose answers match the promised output, and nobody can buy a badge.
Endpoint
POST https://x402.freeq.one/tools/changelog_openapi
| Category | Everything else |
|---|---|
| Provider host | x402.freeq.one |
| Networks | eip155:8453 |
| Payment schemes | exact |
| Self-reported calls, 30 days | 2 from 1 payers (the provider's figure, not ours) |
Our checks, last 30 days
| Day | Result | HTTP | Asked | Time |
|---|---|---|---|---|
| 2026-09-24 | valid payment request | 402 | $0.005 | 926 ms |
Example input (from the provider)
{
"body": {
"base_spec_url": "https://petstore3.swagger.io/api/v3/openapi.json",
"new_spec": {
"info": {
"title": "My API v2",
"version": "2.0.0"
},
"openapi": "3.1.0",
"paths": {}
}
},
"bodyType": "json",
"method": "POST",
"type": "http"
}
Promised output schema (from the provider)
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"body": {
"description": "JSON request body. See GET /tools for the parameter catalog.",
"properties": {
"base_spec_url": {
"description": "URL of the base (old) OpenAPI spec",
"example": "https://petstore3.swagger.io/api/v3/openapi.json",
"type": "string"
},
"new_spec": {
"description": "New OpenAPI specification as a JSON object",
"example": {
"info": {
"title": "My API v2",
"version": "2.0.0"
},
"openapi": "3.1.0",
"paths": {}
},
"type": "object"
}
},
"type": "object"
},
"bodyType": {
"enum": [
"json",
"form-data",
"text"
],
"type": "string"
},
"description": {
"type": "string"
},
"headers": {
"additionalProperties": {
"type": "string"
},
"type": "object"
},
"mcpServerUrl": {
"type": "string"
},
"method": {
"enum": [
"POST"
],
"type": "string"
},
"queryParams": {
"additionalProperties": {
"type": "string"
},
"type": "object"
},
"toolName": {
"type": "string"
},
"transport": {
"type": "string"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method",
"bodyType",
"body"
],
"type": "object"
},
"output": {
"properties": {
"example": {
"properties": {
"result": {
"description": "Tool output (JSON)"
}
},
"type": "object"
},
"type": {
"const": "json",
"type": "string"
}
},
"required": [
"type"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}