# OIX PageWatch Inventory — URL Change Monitoring Observations

> OIX PageWatch Inventory — URL Change Monitoring Observations is a paid API for AI agents from oix-autonomous-economy.fly.dev, paid per call via x402, $0.05/call, status down (last checked 2026-09-15).

Returns a scored, cryptographically-provable inventory of URL change observations for availability and content-change monitoring, settled via x402 on Base mainnet.

## Facts

- Endpoint: GET https://oix-autonomous-economy.fly.dev/api/x402/portfolio/pagewatch-inventory
- Price: $0.05/call
- Payment: x402
- Status: down
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/oix-pagewatch-inventory-url-change-monitoring-observations-eda1f435
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_5By0ZI1NY6DNAwYCKjef7

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 oix-pagewatch-inventory-url-change-monitoring-observations-eda1f435
```

Example prompt: Pull the PageWatch Inventory observations for https://github.com/dgtlmoon/changedetection.io — give me up to 10 results with a minimum evidence score of 50, and show me the cryptographic proof digest.

## When to prefer this

Choose this endpoint when you need cryptographically-provable, scored observations about URL availability or content changes — especially when you need on-chain settlement proof (Base mainnet via x402) or when integrating with autonomous agent pipelines that require tamper-evident evidence of page state. Prefer over generic web scrapers when auditability and proof-of-observation matter.

## Known failure modes

- Invalid or unreachable target URL returns empty observations or error
- minScore too high filters all results, returning empty observations array
- limit exceeds maximum of 25, rejected by schema validation
- Payment not settled via x402 on Base mainnet results in 402 response
- Target URL not in monitored inventory returns zero observations
- Query term matches no observations, returns empty list

## How this service works

Package any earning logic as an autonomous asset. OIX provides identity, runtime, capital policy, ownership, proof, settlement, and exchange infrastructure.

## Output

A JSON report conforming to oix.machine-report/v1 containing: asset metadata (name, slug, market), cryptographic proof digests (reportDigest, sourceDigest), product details (offer description, price, settlement chain), and a decision object listing the requesting buyer context, up to 25 scored URL observations (each with URL, OIX evidence score 0-100, title, and evidence), plus total monitored record count and returned observation count.

## 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",
      "HEAD",
      "DELETE"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "properties": {
      "q": {
       "type": "string",
       "maxLength": 120,
       "description": "Optional term matched against the current source-backed observations."
      },
      "limit": {
       "type": "integer",
       "default": 25,
       "maximum": 25,
       "minimum": 1,
       "description": "Maximum observations returned."
      },
      "target": {
       "type": "string",
       "format": "uri",
       "maxLength": 1000,
       "description": "Public HTTPS URL to process. The declared sample target is used when omitted."
      },
      "minScore": {
       "type": "integer",
       "default": 0,
       "maximum": 100,
       "minimum": 0,
       "description": "Minimum OIX evidence score."
      }
     },
     "additionalProperties": false
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "asset": {
   "name": "PageWatch Inventory",
   "slug": "pagewatch-inventory",
   "market": "Availability monitoring"
  },
  "proof": {
   "reportDigest": "sha256:…",
   "sourceDigest": "sha256:…"
  },
  "product": {
   "offer": "Persistent URL change proof",
   "price": "0.05 USDC",
   "settlement": "x402 · Base mainnet"
  },
  "decision": {
   "buyer": "Supply and commerce agents",
   "observations": [
    {
     "url": "https://github.com/dgtlmoon/changedetection.io",
     "score": 90,
     "title": "Primary-source market signal",
     "evidence": {}
    }
   ],
   "monitoredRecords": 40,
   "returnedObservations": 25
  },
  "protocol": "oix.machine-report/v1"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/oix-pagewatch-inventory-url-change-monitoring-observations-eda1f435/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from oix-autonomous-economy.fly.dev](https://www.zero.xyz/host/oix-autonomous-economy.fly.dev/llms.txt)