# Null Coverage — Base-100 Series + Two-Measure Correlation

> Null Coverage — Base-100 Series + 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 2026-10-18).

Computes a base-100 index series and a two-measure Pearson/rank correlation report for null coverage data (missing_values and total_values) supplied in up to 200 rows.

## Facts

- Endpoint: POST https://market.datapackvibe.com/x402/assistant-ib26-analytics-03-165?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/null-coverage-base-100-series-two-measure-correlation-d17800c1
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_tSq_UEbts-9ug8Yslyndw

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 null-coverage-base-100-series-two-measure-correlation-d17800c1 -d '<json body>'
```

Example prompt: I have 50 rows of null coverage data with missing_values and total_values for each date — can you generate a base-100 index series starting at row 0 for missing_values, plus a correlation report between the two measures?

## When to prefer this

Choose this endpoint when you already have null coverage data in hand (missing_values and total_values per row) and need two specific offline statistical outputs — a base-100 rebased time series and a cross-measure correlation — without any live data fetching, prediction, or external enrichment. It is ideal for lightweight data quality audits where both a trend index and a correlation check are needed in a single call at minimal cost.

## Known failure modes

- Missing required fields (row_id, date, missing_values, total_values) cause validation errors
- Submitting more than 200 rows returns an array-length validation error
- Invalid date format (not YYYY-MM-DD) causes a pattern validation failure
- base_index pointing to a null or missing field value may produce undefined index anchoring
- All-null missing_values or total_values columns may produce undefined correlation results
- Payment not included or incorrect USDC amount results in 402 Payment Required

## How this service works

Null coverage — Base-100 series + Two-measure correlation: Base-100 series + Two-measure correlation for supplied null coverage records (missing_values, total_values). 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 base-100 rebased index series for the selected field (missing_values or total_values) anchored at the specified base_index row, showing relative change over the supplied rows; and (2) a two-measure correlation report quantifying the statistical relationship between missing_values and total_values across all supplied rows. Both reports are computed locally with no external data lookups.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "rows": {
   "type": "array",
   "items": {
    "type": "object",
    "required": [
     "row_id",
     "dataset_group",
     "date",
     "missing_values",
     "total_values"
    ],
    "properties": {
     "date": {
      "type": "string",
      "default": "",
      "pattern": "^\\d{4}-\\d{2}-\\d{2}$",
      "maxLength": 10
     },
     "row_id": {
      "type": "string",
      "default": "",
      "maxLength": 80,
      "minLength": 1
     },
     "total_values": {
      "type": [
       "number",
       "null"
      ],
      "maximum": 1000000000000,
      "minimum": -1000000000000
     },
     "dataset_group": {
      "type": "string",
      "default": "",
      "maxLength": 80
     },
     "missing_values": {
      "type": [
       "number",
       "null"
      ],
      "maximum": 1000000000000,
      "minimum": -1000000000000
     }
    },
    "additionalProperties": false
   },
   "default": [
    {
     "date": "2026-10-01",
     "row_id": "row-1",
     "total_values": 1,
     "dataset_group": "group-a",
     "missing_values": 10
    },
    {
     "date": "2026-10-02",
     "row_id": "row-2",
     "total_values": 2,
     "dataset_group": "group-b",
     "missing_values": 20
    },
    {
     "date": "2026-10-03",
     "row_id": "row-3",
     "total_values": 3,
     "dataset_group": "group-a",
     "missing_values": 15
    },
    {
     "date": "2026-10-04",
     "row_id": "row-4",
     "total_values": 4,
     "dataset_group": "group-b",
     "missing_values": 30
    }
   ],
   "maxItems": 200,
   "minItems": 1
  },
  "field": {
   "enum": [
    "missing_values",
    "total_values"
   ],
   "type": "string",
   "default": "missing_values"
  },
  "base_index": {
   "type": "integer",
   "default": 0,
   "maximum": 199,
   "minimum": 0
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/null-coverage-base-100-series-two-measure-correlation-d17800c1/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)