# Null Coverage String Normalisation and Missing-Value Fill

> Null Coverage String Normalisation and Missing-Value Fill is a paid API for AI agents from market.datapackvibe.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-16).

Normalises string fields and fills explicit missing values (zero, mean, or median) in null-coverage records containing missing_values and total_values columns, returning 2 analytical reports for up to 200 rows.

## Facts

- Endpoint: POST https://market.datapackvibe.com/x402/assistant-ib26-analytics-03-037?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-16
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/null-coverage-string-normalisation-and-missing-value-fill-1c08feb1
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_YuEoTgDNKS_YE9wpzbEwh

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-string-normalisation-and-missing-value-fill-1c08feb1 -d '<json body>'
```

Example prompt: I have up to 200 rows of null coverage records with missing_values and total_values columns grouped by dataset_group — can you normalise the strings and fill the missing_values field using median imputation, then give me two analytical reports?

## When to prefer this

Choose this endpoint when you have a bounded set of up to 200 null coverage records (with missing_values and total_values columns) and need both string normalisation and explicit missing-value imputation (zero, mean, or median) with two structured analytical reports, all processed locally without any external data lookup or live prediction. Prefer it over general-purpose data tools when you specifically need dual-report output on null coverage metrics per dataset group.

## Known failure modes

- Row count exceeds 200 items — request rejected
- Required fields (row_id, date, missing_values, total_values) absent from one or more rows
- Date strings not matching YYYY-MM-DD pattern — validation error
- Numeric values outside allowed range (±1 trillion) — rejected
- Invalid method enum value (not zero/mean/median) — error
- Invalid field enum value (not missing_values/total_values) — error
- Empty rows array — minimum 1 item required

## How this service works

Null coverage — String normalisation + Explicit missing-value fill: String normalisation + Explicit missing-value fill 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

Two analytical reports covering the supplied null coverage rows (up to 200): one covering string normalisation applied to fields like dataset_group and date, and one covering explicit missing-value fill results for the chosen field (missing_values or total_values) using the selected method (zero, mean, or median), including imputed values and coverage statistics.

## 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"
  },
  "method": {
   "enum": [
    "zero",
    "mean",
    "median"
   ],
   "type": "string",
   "default": "median"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/null-coverage-string-normalisation-and-missing-value-fill-1c08feb1/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)