# News Archive Completeness — Category Frequencies + Two-Measure Correlation

> News Archive Completeness — Category Frequencies + Two-Measure Correlation is a paid API for AI agents from market.datapackvibe.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-11-02).

Analyzes news archive completeness records by computing category frequencies across channel groups and calculating the correlation between indexed_items and expected_items.

## Facts

- Endpoint: POST https://market.datapackvibe.com/x402/assistant-ib26-news-23-108?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-11-02
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/news-archive-completeness-category-frequencies-two-measure-correlation-3f6a0813
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_P-VsaNj-G3UPN1UiihE5-

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 news-archive-completeness-category-frequencies-two-measure-correlation-3f6a0813 -d '<json body>'
```

Example prompt: Can you analyze the completeness of my news archive — I have up to 200 rows with channel groups like 'politics' and 'sports', each with an indexed_items count and an expected_items count across daily dates, and I need a category frequency report plus the correlation between indexed and expected items?

## When to prefer this

Choose this endpoint when you have up to 200 rows of news archive completeness data keyed by channel group and date, and you need both a categorical frequency breakdown and a numeric correlation between two measures (indexed vs expected items) in a single low-cost call. It is ideal for lightweight, offline statistical auditing without requiring external data sources or a full analytics platform.

## Known failure modes

- Missing required fields (row_id, channel_group, date, indexed_items, or expected_items) causes validation error
- Exceeding 200 rows returns an error or truncation
- Malformed date strings not matching YYYY-MM-DD pattern rejected
- Null values in both numeric measures may degrade or invalidate correlation output
- Empty rows array rejected (minItems: 1)

## How this service works

News archive completeness — Category frequencies + Two-measure correlation: Category frequencies + Two-measure correlation for supplied news archive completeness records (indexed_items, expected_items). Up to 200 rows; 2 independent reports using shared local analytical engines. No live lookup, prediction, professional assessment or external action. 0.01 USDC includes 2 supplied-data reports for up to 200 rows.

## Output

Returns two analytical reports: (1) a category frequency report showing how often each channel_group appears across the supplied rows, and (2) a Pearson or rank correlation between the indexed_items and expected_items numeric measures — all computed locally from the supplied data with no external lookups.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "rows": {
   "type": "array",
   "items": {
    "type": "object",
    "required": [
     "row_id",
     "channel_group",
     "date",
     "indexed_items",
     "expected_items"
    ],
    "properties": {
     "date": {
      "type": "string",
      "default": "",
      "pattern": "^\\d{4}-\\d{2}-\\d{2}$",
      "maxLength": 10
     },
     "row_id": {
      "type": "string",
      "default": "",
      "maxLength": 80,
      "minLength": 1
     },
     "channel_group": {
      "type": "string",
      "default": "",
      "maxLength": 80
     },
     "indexed_items": {
      "type": [
       "number",
       "null"
      ],
      "maximum": 1000000000000,
      "minimum": -1000000000000
     },
     "expected_items": {
      "type": [
       "number",
       "null"
      ],
      "maximum": 1000000000000,
      "minimum": -1000000000000
     }
    },
    "additionalProperties": false
   },
   "default": [
    {
     "date": "2026-10-01",
     "row_id": "row-1",
     "channel_group": "group-a",
     "indexed_items": 10,
     "expected_items": 1
    },
    {
     "date": "2026-10-02",
     "row_id": "row-2",
     "channel_group": "group-b",
     "indexed_items": 20,
     "expected_items": 2
    },
    {
     "date": "2026-10-03",
     "row_id": "row-3",
     "channel_group": "group-a",
     "indexed_items": 15,
     "expected_items": 3
    },
    {
     "date": "2026-10-04",
     "row_id": "row-4",
     "channel_group": "group-b",
     "indexed_items": 30,
     "expected_items": 4
    }
   ],
   "maxItems": 200,
   "minItems": 1
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/news-archive-completeness-category-frequencies-two-measure-correlation-3f6a0813/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)