# agentutility — paid x402 endpoints for autonomous agents

> agentutility — paid x402 endpoints for autonomous agents is a paid API for AI agents from x402.agentutility.ai, paid per call via x402, $0.04/call, status unknown (last checked 2026-09-14).

## Facts

- Endpoint: POST https://x402.agentutility.ai/webpage-diff
- Price: $0.04/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/webpage-diff-fd57ddae
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_LhmJkh_nrGft0gRHmLjW-

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 webpage-diff-fd57ddae -d '<json body>'
```

## How this service works

Paid x402 endpoints organized into product clusters. USDC-settled on Base. MCP-callable. ERC-8004 identity registry agentId 47167.

## Request schema (JSON Schema)

```json
{
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "type": "object",
 "properties": {
  "input": {
   "type": "object",
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "type": "string",
     "enum": [
      "POST"
     ]
    },
    "bodyType": {
     "type": "string",
     "enum": [
      "json",
      "form-data",
      "text"
     ]
    },
    "body": {
     "properties": {
      "url": {
       "type": "string",
       "description": "Page URL to fetch (http or https). Server follows redirects and reports the final_url."
      },
      "previous_hash": {
       "type": "string",
       "description": "SHA-256 of a prior fetch, hex-encoded. If provided, response.changed compares against this hash."
      },
      "previous_text": {
       "type": "string",
       "description": "Prior plain-text content from a previous fetch. If provided, response.diff returns added/removed line arrays."
      },
      "selector": {
       "type": "string",
       "description": "Optional CSS selector to scope the diff (e.g. 'article', '#price'). When set, only matched element text is hashed and compared."
      }
     },
     "required": [
      "url"
     ]
    }
   },
   "required": [
    "type",
    "method",
    "bodyType",
    "body"
   ],
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "properties": {
      "url": {
       "type": "string"
      },
      "final_url": {
       "type": "string"
      },
      "status_code": {
       "type": "integer"
      },
      "current_text": {
       "type": "string"
      },
      "current_hash": {
       "type": "string"
      },
      "char_count": {
       "type": "integer"
      },
      "selector": {
       "type": "null"
      },
      "changed": {
       "type": "boolean"
      },
      "diff": {
       "type": "null"
      }
     }
    }
   },
   "required": [
    "type"
   ]
  }
 },
 "required": [
  "input"
 ]
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "url": "https://example.com",
  "diff": null,
  "changed": true,
  "selector": null,
  "final_url": "https://example.com/",
  "char_count": 127,
  "status_code": 200,
  "current_hash": "feb057ddba5ac313506909af05c17370808a81030f057346499d045c25534dbf",
  "current_text": "Example Domain\nThis domain is for use in documentation examples without needing permission. Avoid use in operations.\nLearn more"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/webpage-diff-fd57ddae/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402.agentutility.ai](https://www.zero.xyz/host/x402.agentutility.ai/llms.txt)