# Sampling Observations — Daily Sum Series + Equal-Width Histogram

> Sampling Observations — Daily Sum Series + Equal-Width Histogram is a paid API for AI agents from market.datapackvibe.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-15).

Computes a daily sum time series and an equal-width histogram from supplied sampling observation records (sample_value, sample_weight) for up to 200 rows.

## Facts

- Endpoint: POST https://market.datapackvibe.com/x402/assistant-ib26-analytics-15-139?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/sampling-observations-daily-sum-series-equal-width-histogram-d60da128
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_FmELY2Gd0jTo0QBdQhSWS

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 sampling-observations-daily-sum-series-equal-width-histogram-d60da128 -d '<json body>'
```

Example prompt: Can you run a daily sum series and a 10-bin equal-width histogram on these sampling observations — I have 80 rows, each with a date, row_id, dataset_group, sample_value, and sample_weight — and analyze the sample_value field?

## When to prefer this

Choose this endpoint when you have up to 200 rows of sampling observations with dates and numeric values and need both a time-series daily sum and a histogram distribution report in a single low-cost call ($0.01 USDC). It is ideal for lightweight offline statistical summarization of sampled data without needing a full analytics platform or live data connection.

## Known failure modes

- More than 200 rows submitted — exceeds maxItems limit, request rejected
- Invalid date format (not YYYY-MM-DD) — schema validation failure
- bins value outside 1–30 range — validation error
- sample_value or sample_weight outside ±1,000,000,000,000 — validation error
- Empty rows array — minItems violation
- Missing required fields (row_id, dataset_group, date, sample_value, sample_weight) — schema error
- Payment not provided or insufficient — x402 payment required error

## How this service works

Sampling observations — Daily sum series + Equal-width histogram: Daily sum series + Equal-width histogram for supplied sampling observations records (sample_value, sample_weight). 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 independent analytical reports: (1) a daily sum series aggregating the chosen field (sample_value or sample_weight) by date across all supplied rows, and (2) an equal-width histogram breaking the chosen field into the specified number of bins with frequency counts. Both are computed locally on the supplied data with no external lookups.

## 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",
     "sample_value",
     "sample_weight"
    ],
    "properties": {
     "date": {
      "type": "string",
      "default": "",
      "pattern": "^\\d{4}-\\d{2}-\\d{2}$",
      "maxLength": 10
     },
     "row_id": {
      "type": "string",
      "default": "",
      "maxLength": 80,
      "minLength": 1
     },
     "sample_value": {
      "type": [
       "number",
       "null"
      ],
      "maximum": 1000000000000,
      "minimum": -1000000000000
     },
     "dataset_group": {
      "type": "string",
      "default": "",
      "maxLength": 80
     },
     "sample_weight": {
      "type": [
       "number",
       "null"
      ],
      "maximum": 1000000000000,
      "minimum": -1000000000000
     }
    },
    "additionalProperties": false
   },
   "default": [
    {
     "date": "2026-10-01",
     "row_id": "row-1",
     "sample_value": 10,
     "dataset_group": "group-a",
     "sample_weight": 1
    },
    {
     "date": "2026-10-02",
     "row_id": "row-2",
     "sample_value": 20,
     "dataset_group": "group-b",
     "sample_weight": 2
    },
    {
     "date": "2026-10-03",
     "row_id": "row-3",
     "sample_value": 15,
     "dataset_group": "group-a",
     "sample_weight": 3
    },
    {
     "date": "2026-10-04",
     "row_id": "row-4",
     "sample_value": 30,
     "dataset_group": "group-b",
     "sample_weight": 4
    }
   ],
   "maxItems": 200,
   "minItems": 1
  },
  "field": {
   "enum": [
    "sample_value",
    "sample_weight"
   ],
   "type": "string",
   "default": "sample_value"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/sampling-observations-daily-sum-series-equal-width-histogram-d60da128/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)