# Level-two headings — Empty value report

> Level-two headings — Empty value report is a paid API for AI agents from market.datapackvibe.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-13).

Parses a webpage or HTML snippet to report which H2 heading elements have empty values for a specified attribute.

## Facts

- Endpoint: POST https://market.datapackvibe.com/x402/assistant-bx-web-h2-empty?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/level-two-headings-empty-value-report-64c626da
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Cn1mLU0jD7UhBoenU452i

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 level-two-headings-empty-value-report-64c626da -d '<json body>'
```

Example prompt: Check this page https://example.com/docs for any H2 headings where the 'id' attribute is empty — I'm looking for headings related to 'installation' and give me a report.

## When to prefer this

Use this endpoint when you need a fast, lightweight audit of H2-level heading elements specifically for empty attribute values on a static HTML page or URL. Prefer it over full-site crawlers when you only need heading-level attribute checks without JavaScript execution, login flows, or deep DOM traversal. Ideal for SEO audits, accessibility checks, or content QA pipelines that process one page at a time.

## Known failure modes

- URL is unreachable or returns non-200 status — endpoint cannot fetch page
- URL requires JavaScript rendering — static parser returns incomplete results
- HTML input exceeds 100,000 character limit — request rejected
- Attribute name does not match pattern ^[a-zA-Z][a-zA-Z0-9:_-]{0,49}$ — validation error
- No H2 headings found on the page — empty result set returned
- URL and HTML both absent or malformed — ambiguous input error

## How this service works

Level-two headings — Empty value report: Empty value report for Level-two headings. 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 empty value report result.

## Output

A bounded report listing H2 heading elements found in the parsed HTML or fetched URL that have empty values for the specified attribute, along with relevant heading text and attribute metadata. Static parsing only — no JavaScript rendering or authentication.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "url": {
   "type": "string",
   "default": "",
   "maxLength": 2048
  },
  "html": {
   "type": "string",
   "default": "<!doctype html><html><head></head><body><h2 id=\"sample\" data-kind=\"example\">Example product guide</h2></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/level-two-headings-empty-value-report-64c626da/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)