# Definition Descriptions — Attribute Presence Check

> Definition Descriptions — Attribute Presence Check is a paid API for AI agents from market.datapackvibe.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-21).

Checks whether a specified HTML attribute (optionally with a specific value) is present on definition description elements matching a given term in a webpage or supplied HTML.

## Facts

- Endpoint: POST https://market.datapackvibe.com/x402/assistant-bx-web-definition-text-attribute-presence?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-21
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/definition-descriptions-attribute-presence-check-5de1894d
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Yetq33CfZ4xlIArdSRFWm

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 definition-descriptions-attribute-presence-check-5de1894d -d '<json body>'
```

Example prompt: Check the page at https://docs.example.com/glossary whether any definition description element containing the term 'authentication' has the attribute 'data-kind' with value 'technical'.

## When to prefer this

Choose this endpoint when you need a lightweight, low-cost static check specifically for the presence of HTML attributes on definition description (<dd>) elements in a document, without needing full DOM rendering or JavaScript execution. It is ideal for HTML template validation, accessibility compliance auditing, content structure verification, or automated QA pipelines that scan glossary or definition-list pages for specific attribute patterns.

## Known failure modes

- URL is inaccessible or returns a non-200 response — check fails to retrieve page
- HTML exceeds 100,000 character limit — input rejected
- Attribute name does not match the required pattern (must start with a letter, alphanumeric/colon/underscore/hyphen, max 50 chars) — validation error
- Term not found in any definition description element — presence check returns false/absent
- Page requires JavaScript rendering to display content — static parser returns no matching elements
- URL and HTML both empty — no content to parse

## How this service works

Definition descriptions — Attribute presence check: Attribute presence check for Definition descriptions. One public HTTPS page or supplied HTML; static parsing, no JavaScript rendering, login or access bypass. Specialised preset in a shared 50-profile, 20-operation engine. 0.01 USDC includes one bounded attribute presence check result.

## Output

Returns a bounded result indicating whether the specified HTML attribute (and optionally a specific attribute value) is present on definition description elements that match the given term, parsed statically from the provided URL or raw HTML without JavaScript rendering.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "url": {
   "type": "string",
   "default": "",
   "maxLength": 2048
  },
  "html": {
   "type": "string",
   "default": "<!doctype html><html><head></head><body><dd id=\"sample\" data-kind=\"example\">Example product guide</dd></body></html>",
   "maxLength": 100000
  },
  "term": {
   "type": "string",
   "default": "product",
   "maxLength": 100,
   "minLength": 1
  },
  "attribute": {
   "type": "string",
   "default": "id",
   "pattern": "^[a-zA-Z][a-zA-Z0-9:_-]{0,49}$",
   "maxLength": 50
  },
  "previous_texts": {
   "type": "array",
   "items": {
    "type": "string",
    "default": "",
    "maxLength": 1000
   },
   "default": [
    "Older example"
   ],
   "maxItems": 200,
   "minItems": 0
  },
  "attribute_value": {
   "type": "string",
   "default": "sample",
   "maxLength": 200
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/definition-descriptions-attribute-presence-check-5de1894d/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from market.datapackvibe.com](https://www.zero.xyz/host/market.datapackvibe.com/llms.txt)