# Newsletter Heading Hierarchy Audit

> Newsletter Heading Hierarchy Audit is a paid API for AI agents from market.datapackvibe.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-18).

Audits the heading hierarchy of a newsletter document (Markdown or plain text) to identify structural issues with heading levels and organization

## Facts

- Endpoint: POST https://market.datapackvibe.com/x402/assistant-sector-writing-newsletter-heading-audit?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-18
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/newsletter-heading-hierarchy-audit-c48f27bd
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_78QyWlpplnmrk5ZxP1HyK

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 newsletter-heading-hierarchy-audit-c48f27bd -d '<json body>'
```

Example prompt: Can you audit the heading hierarchy in my newsletter draft and flag any structural issues? Here's the content: '# Monthly Digest
## Top Stories
#### Feature Article
## Updates
### Community News'

## When to prefer this

Choose this endpoint when you need a fast, deterministic, rule-based audit of heading hierarchy specifically within newsletter content. It is ideal for pre-send quality checks, template validation, or accessibility reviews where you need consistent structural feedback without generative AI prose or hallucination risk. Prefer this over general-purpose writing assistants when you want repeatable, bounded output on heading structure alone.

## Known failure modes

- Input text exceeds 20,000 character limit — request rejected
- Empty or missing text field — no content to audit
- Plain text with no recognizable heading markers — limited or empty audit output
- Malformed Markdown syntax may reduce heading detection accuracy
- Payment of 0.01 USDC not fulfilled — 402 response blocking access

## How this service works

Newsletter - Heading hierarchy audit: Heading hierarchy audit for Newsletter. Supplied Markdown or plain text, up to 20,000 characters. Deterministic processing and document templates; no generative prose or fact checking. One of 25 profiles or calculations across 20 shared operations in this sector. 0.01 USDC includes one bounded heading hierarchy audit deliverable.

## Output

A bounded heading hierarchy audit report identifying structural issues in the supplied newsletter's heading levels, such as skipped levels, improper nesting, missing top-level headings, or inconsistent hierarchy, based on deterministic document analysis of the provided Markdown or plain text (up to 20,000 characters).

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "text": {
   "type": "string",
   "default": "## Introduction\nExample 1 content.\nTODO: review the supplied document by 2026-10-10.\n\n## Updates\nExample 2 content.\nTODO: review the supplied document by 2026-10-10.\n\n## Call to action\nExample 3 content.\nTODO: review the supplied document by 2026-10-10.",
   "maxLength": 20000
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/newsletter-heading-hierarchy-audit-c48f27bd/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)