# Null Coverage Duplicate Key Report + Two-Measure Correlation

> Null Coverage Duplicate Key Report + 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).

Analyzes up to 200 null-coverage records to produce a duplicate key report and a two-measure Pearson/rank correlation between missing_values and total_values.

## Facts

- Endpoint: POST https://market.datapackvibe.com/x402/assistant-ib26-analytics-03-066?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-duplicate-key-report-two-measure-correlation-894909aa
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_eEPLi92rRLgCHiuS0Erjs

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-duplicate-key-report-two-measure-correlation-894909aa -d '<json body>'
```

Example prompt: I have 150 rows of null coverage data with row IDs, dataset groups, dates, missing_values, and total_values — can you run a duplicate key report and a two-measure correlation between missing_values and total_values on all of them?

## When to prefer this

Choose this endpoint when you have up to 200 null-coverage records (rows with missing_values and total_values) and need both a duplicate key check and a statistical correlation between those two measures in a single paid call. It is ideal for data quality workflows where you want to detect duplicate row IDs and quantify how missing data correlates with dataset size without setting up your own analytics infrastructure.

## Known failure modes

- Fewer than 1 row submitted — request rejected
- More than 200 rows submitted — exceeds maximum row limit
- Missing required fields (row_id, missing_values, total_values) — validation error
- Date field does not match YYYY-MM-DD pattern — schema validation failure
- Non-numeric values supplied for missing_values or total_values — type error
- Payment not provided or insufficient USDC — x402 payment required error

## How this service works

Null coverage — Duplicate key report + Two-measure correlation: Duplicate key report + 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 duplicate key report identifying any row_ids that appear more than once in the supplied records, and (2) a two-measure correlation report showing the statistical relationship between missing_values and total_values across all rows. No external lookups or predictions are made — all analysis is performed locally on the submitted data.

## 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
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/null-coverage-duplicate-key-report-two-measure-correlation-894909aa/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)