# Newsletter ISO-Date Pattern Inventory

> Newsletter ISO-Date Pattern Inventory 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).

Scans a newsletter document (Markdown or plain text) and returns an inventory of all ISO-date patterns found within it

## Facts

- Endpoint: POST https://market.datapackvibe.com/x402/assistant-sector-writing-newsletter-date-inventory?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-iso-date-pattern-inventory-4e3e6ab0
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_JWuN18GJgaSmkRVfUXoNM

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-iso-date-pattern-inventory-4e3e6ab0 -d '<json body>'
```

Example prompt: Can you scan this newsletter draft for me and pull out an inventory of all the ISO-date patterns in it? Here's the text: '## Introduction
Example 1 content.
TODO: review by 2026-10-10.

## Updates
Content here.
Deadline: 2026-11-15.'

## When to prefer this

Choose this endpoint when you need a deterministic, bounded extraction of ISO-date patterns specifically from newsletter-format Markdown or plain text documents. It is purpose-built for the newsletter content type and guaranteed to be non-generative (no hallucinated dates). Prefer it over general-purpose LLM date extraction when you need reproducible, auditable results for the same input.

## Known failure modes

- Text exceeds 20,000 character limit — request rejected
- No ISO-date patterns found in the document — empty inventory returned
- Malformed input (non-string text field) — validation error
- Network or payment failure — HTTP 402 or 5xx response

## How this service works

Newsletter - ISO-date pattern inventory: ISO-date pattern inventory 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 iso-date pattern inventory deliverable.

## Output

A structured inventory of all ISO-date patterns (YYYY-MM-DD format) found in the supplied newsletter text, including their occurrences and positions within the document. The result is deterministic — the same input always produces the same output — with no generative prose or fact-checking.

## 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-iso-date-pattern-inventory-4e3e6ab0/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)