# Sampling Observations Base-100 Series and Keyed Dataset Comparison

> Sampling Observations Base-100 Series and Keyed Dataset Comparison 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 Base-100 indexed time series and a keyed dataset comparison report for up to 200 rows of weighted sampling observations.

## Facts

- Endpoint: POST https://market.datapackvibe.com/x402/assistant-ib26-analytics-15-168?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-base-100-series-and-keyed-dataset-comparison-a30086ac
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_7Qxv_ya7h0G-3AE_smKTi

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-base-100-series-and-keyed-dataset-comparison-a30086ac -d '<json body>'
```

Example prompt: I have two sets of sampling observations with sample_value and sample_weight for each row — can you run a base-100 series index and a keyed comparison between my two datasets? Here are the rows for the primary dataset (group-a vs group-b dated 2026-10-01 through 2026-10-04) and a second dataset with slightly different values — I want both reports using sample_value.

## When to prefer this

Choose this endpoint when you need both a base-100 normalized time series and a cross-dataset keyed comparison in a single paid call, using your own supplied observation data (up to 200 rows) without requiring any external data lookup, prediction, or live enrichment. It is well-suited for researchers, analysts, or automated pipelines that already have structured sampling data with weights and need reproducible index and comparison analytics cheaply at $0.01 USDC per call.

## Known failure modes

- Fewer than 1 row supplied — minItems constraint violation
- More than 200 rows submitted — maxItems constraint exceeded
- Invalid date format (not YYYY-MM-DD) on any row
- Missing required fields (row_id, dataset_group, date, sample_value, sample_weight) on any row
- sample_value or sample_weight outside the ±1,000,000,000,000 range
- Invalid field enum value (must be 'sample_value' or 'sample_weight')
- Payment of 0.01 USDC not completed — x402 payment required

## How this service works

Sampling observations — Base-100 series + Keyed dataset comparison: Base-100 series + Keyed dataset comparison 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

Returns two independent analytical reports for the supplied rows: (1) a Base-100 indexed time series where values are rebased relative to a baseline period, and (2) a keyed dataset comparison aligning the primary and secondary datasets by row ID and group to highlight differences — all computed locally with no external data lookup.

## Request schema (JSON Schema)

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

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/sampling-observations-base-100-series-and-keyed-dataset-comparison-a30086ac/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)