# Label Review Analytics — Equal-Width Histogram & Two-Measure Correlation

> Label Review Analytics — Equal-Width Histogram & 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 2026-10-24).

Runs an equal-width histogram on a chosen field and a two-measure correlation (reviewed_records vs changed_labels) over up to 200 label review rows, returning two independent analytical reports.

## Facts

- Endpoint: POST https://market.datapackvibe.com/x402/assistant-ib26-analytics-12-171?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-24
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/label-review-analytics-equal-width-histogram-two-measure-correlation-6e8244af
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_aDDaBH_cJBoySS2GZuWhL

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 label-review-analytics-equal-width-histogram-two-measure-correlation-6e8244af -d '<json body>'
```

Example prompt: Can you run a histogram with 10 bins on the reviewed_records field and also compute the correlation between reviewed_records and changed_labels for these label review rows: [row-1, 2024-01-01, group-a, reviewed=50, changed=3], [row-2, 2024-01-02, group-b, reviewed=80, changed=7], [row-3, 2024-01-03, group-a, reviewed=60, changed=5]?

## When to prefer this

Choose this endpoint when you have label review or annotation QA data and need both a distribution view (histogram) and a linear relationship check (correlation) between reviewed_records and changed_labels in a single call. It is purpose-built for label review workflows with up to 200 rows and requires no external lookups or live data. Prefer it over general analytics platforms when you want a lightweight, pay-per-call statistical summary without infrastructure setup.

## Known failure modes

- More than 200 rows submitted — request rejected or truncated
- Missing required fields (row_id, reviewed_records, changed_labels, date) cause row-level errors
- Invalid date format (not YYYY-MM-DD) triggers validation failure
- Bin count outside 1–30 range rejected
- Null values in both measure fields may reduce correlation reliability
- All values identical leads to degenerate histogram (single non-empty bin)

## How this service works

Label review — Equal-width histogram + Two-measure correlation: Equal-width histogram + Two-measure correlation for supplied label review records (reviewed_records, changed_labels). 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 independent analytical reports: (1) an equal-width histogram of the selected field (reviewed_records or changed_labels) divided into the specified number of bins with counts per bin, and (2) a correlation report showing the statistical relationship between reviewed_records and changed_labels across the supplied rows. No external data is fetched; all computation uses the provided rows only.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "bins": {
   "type": "integer",
   "default": 5,
   "maximum": 30,
   "minimum": 1
  },
  "rows": {
   "type": "array",
   "items": {
    "type": "object",
    "required": [
     "row_id",
     "dataset_group",
     "date",
     "reviewed_records",
     "changed_labels"
    ],
    "properties": {
     "date": {
      "type": "string",
      "default": "",
      "pattern": "^\\d{4}-\\d{2}-\\d{2}$",
      "maxLength": 10
     },
     "row_id": {
      "type": "string",
      "default": "",
      "maxLength": 80,
      "minLength": 1
     },
     "dataset_group": {
      "type": "string",
      "default": "",
      "maxLength": 80
     },
     "changed_labels": {
      "type": [
       "number",
       "null"
      ],
      "maximum": 1000000000000,
      "minimum": -1000000000000
     },
     "reviewed_records": {
      "type": [
       "number",
       "null"
      ],
      "maximum": 1000000000000,
      "minimum": -1000000000000
     }
    },
    "additionalProperties": false
   },
   "default": [
    {
     "date": "2026-10-01",
     "row_id": "row-1",
     "dataset_group": "group-a",
     "changed_labels": 1,
     "reviewed_records": 10
    },
    {
     "date": "2026-10-02",
     "row_id": "row-2",
     "dataset_group": "group-b",
     "changed_labels": 2,
     "reviewed_records": 20
    },
    {
     "date": "2026-10-03",
     "row_id": "row-3",
     "dataset_group": "group-a",
     "changed_labels": 3,
     "reviewed_records": 15
    },
    {
     "date": "2026-10-04",
     "row_id": "row-4",
     "dataset_group": "group-b",
     "changed_labels": 4,
     "reviewed_records": 30
    }
   ],
   "maxItems": 200,
   "minItems": 1
  },
  "field": {
   "enum": [
    "reviewed_records",
    "changed_labels"
   ],
   "type": "string",
   "default": "reviewed_records"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/label-review-analytics-equal-width-histogram-two-measure-correlation-6e8244af/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)