# OpenAPI Discovery Change Watch

> OpenAPI Discovery Change Watch is a paid API for AI agents from intel.rallylive.ca, paid per call via x402, $0.02/call, status unknown (last checked 2026-09-14).

Monitors a domain's OpenAPI/Swagger discovery status and alerts when it changes, storing results for 90 days to diff against previous checks.

## Facts

- Endpoint: GET https://intel.rallylive.ca/watch/site/openapi
- Price: $0.02/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/openapi-discovery-change-watch-c4f16ffc
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_3K1KHTo4h5gH96q86Q8LD

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability openapi-discovery-change-watch-c4f16ffc
```

Example prompt: Keep an eye on api.acme.com and let me know if its OpenAPI or Swagger discovery status changes — tell me exactly what fields changed and what they were before versus now.

## When to prefer this

Use this endpoint when you need to be notified of changes to OpenAPI/Swagger discovery on a domain over time, rather than just performing a one-off lookup. It is especially valuable for scheduled monitoring workflows where knowing what changed (field-level diffs) matters more than just getting the current state. Prefer it over a plain discovery check when you want persistent state tracking across multiple calls without managing your own storage.

## Known failure modes

- Domain not previously checked — no baseline to compare against, returns current result with no diff
- Domain unreachable — may return error or incomplete discovery result
- No change detected — returns changed: false with current state only
- Baseline older than 90 days — previous result expired, treated as first-time check

## How this service works

Change watch for openapi discovery: runs the check and compares it with the result from your previous call for the same domain (kept 90 days), returning the current answer, changed true/false, exactly which fields changed with before/after values, and when it was last seen. Call it on a schedule to be told when openapi / swagger discovery changes. $0.01 per check.

## Output

Returns the current OpenAPI/Swagger discovery answer for the domain, a boolean 'changed' flag indicating whether it differs from the previous check (stored up to 90 days), a list of exactly which fields changed with their before and after values, and a timestamp of when the result was last seen.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "properties": {}
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/openapi-discovery-change-watch-c4f16ffc/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from intel.rallylive.ca](https://www.zero.xyz/host/intel.rallylive.ca/llms.txt)