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agent402.tools OpenAPI Diff
x402
agent402.tools OpenAPI Diff is a paid API for AI agents from agent402.tools, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-14).
Compares two OpenAPI 3.x or Swagger 2.x documents and returns a structured diff of added, removed, and changed endpoints with a breaking-change flag.
Price / call$0.001
Success—
StatusUnknown
How this service works
Compare two OpenAPI 3.x or Swagger 2.x documents and return a structured diff: added / removed / changed endpoints, with a conservative "is any change breaking?" flag. Breaking = an endpoint or required-2xx status was removed, a required parameter was added, an optional param became required, a param type changed, or a JSON body field became required. Pure CPU - deterministic, no network, no $ref dereferencing (resolve refs upstream if needed).
Output
A structured JSON diff listing added endpoints, removed endpoints, and changed endpoints between the two API specs, plus a boolean 'is breaking?' flag set to true if any endpoint or required 2xx status was removed or a required parameter was dropped.
Example use cases
Example prompt
“Can you compare these two OpenAPI specs and tell me what changed — specifically whether any endpoints were removed or required parameters were dropped? Here's the old spec and the new spec.”
Technical details
Endpoint
POSThttps://agent402.tools/api/openapi-diffWhen to prefer
Use this endpoint when you need a programmatic, structured breakdown of API changes between two versions — especially when you need a reliable breaking-change signal. Prefer this over manual diffing or generic text comparison when the inputs are valid OpenAPI/Swagger documents and you need machine-readable output distinguishing added, removed, and changed endpoints.
Side effects
- Invalid JSON or non-OpenAPI document provided — parse error returned
- Missing 'before' or 'after' field — validation error
- Malformed Swagger 2.x or OpenAPI 3.x structure — schema validation failure
- Payment not attached or insufficient — 402 Payment Required
- Network timeout on large spec documents
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| after | — | OpenAPI/Swagger document (object or JSON string) for the new version |
| before | — | OpenAPI/Swagger document (object or JSON string) for the previous version |
Output
Schema · Response
{
"type": "json",
"example": {
"added": [
"POST /admin"
],
"changed": [],
"removed": [
"GET /legacy"
],
"summary": {
"added": 1,
"changed": 0,
"removed": 1
},
"breaking": true,
"breakingCount": 1
}
}Tags
x402
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