# Feed Observations Base-100 Series and Secondary-Measure Weighted Mean

> Feed Observations Base-100 Series and Secondary-Measure Weighted Mean is a paid API for AI agents from market.datapackvibe.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-22).

Computes a base-100 index series and a secondary-measure weighted mean for up to 200 rows of feed observation data (item_count, duplicate_items) using local analytical engines.

## Facts

- Endpoint: POST https://market.datapackvibe.com/x402/assistant-ib26-web-11-166?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-22
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/feed-observations-base-100-series-and-secondary-measure-weighted-mean-6be03e96
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_BMIONyj1t-_DcV3nh3uJd

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 feed-observations-base-100-series-and-secondary-measure-weighted-mean-6be03e96 -d '<json body>'
```

Example prompt: I have feed observation data for two site groups over several dates — can you generate a base-100 index series for item_count starting from row 0, plus a weighted mean for duplicate_items, for these rows: group-a on 2026-10-01 had 10 items and 1 duplicate, group-b on 2026-10-02 had 20 items and 2 duplicates?

## When to prefer this

Choose this endpoint when you have tabular feed observation data with item counts and duplicate item counts and need both a base-100 normalized index series and a weighted mean computed in a single call, without any external data lookups or live predictions. It is cost-effective at $0.01 USDC for two reports on up to 200 rows. Prefer it over general analytics APIs when working specifically with feed monitoring data keyed by site_group and date.

## Known failure modes

- Fewer than 1 row supplied — request rejected
- More than 200 rows supplied — exceeds maxItems limit
- Invalid date format (not YYYY-MM-DD) — schema validation error
- base_index out of range (≥ number of rows) — index out of bounds error
- Missing required fields (row_id, site_group, date, item_count, duplicate_items) — validation failure
- Payment not included or insufficient — x402 payment required error

## How this service works

Feed observations — Base-100 series + Secondary-measure weighted mean: Base-100 series + Secondary-measure weighted mean for supplied feed observations records (item_count, duplicate_items). 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 base-100 index series for the chosen field (item_count or duplicate_items) relative to the specified base row, and (2) a secondary-measure weighted mean across the supplied feed observation rows. Both are computed locally with no external lookups, covering up to 200 input rows.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "rows": {
   "type": "array",
   "items": {
    "type": "object",
    "required": [
     "row_id",
     "site_group",
     "date",
     "item_count",
     "duplicate_items"
    ],
    "properties": {
     "date": {
      "type": "string",
      "default": "",
      "pattern": "^\\d{4}-\\d{2}-\\d{2}$",
      "maxLength": 10
     },
     "row_id": {
      "type": "string",
      "default": "",
      "maxLength": 80,
      "minLength": 1
     },
     "item_count": {
      "type": [
       "number",
       "null"
      ],
      "maximum": 1000000000000,
      "minimum": -1000000000000
     },
     "site_group": {
      "type": "string",
      "default": "",
      "maxLength": 80
     },
     "duplicate_items": {
      "type": [
       "number",
       "null"
      ],
      "maximum": 1000000000000,
      "minimum": -1000000000000
     }
    },
    "additionalProperties": false
   },
   "default": [
    {
     "date": "2026-10-01",
     "row_id": "row-1",
     "item_count": 10,
     "site_group": "group-a",
     "duplicate_items": 1
    },
    {
     "date": "2026-10-02",
     "row_id": "row-2",
     "item_count": 20,
     "site_group": "group-b",
     "duplicate_items": 2
    },
    {
     "date": "2026-10-03",
     "row_id": "row-3",
     "item_count": 15,
     "site_group": "group-a",
     "duplicate_items": 3
    },
    {
     "date": "2026-10-04",
     "row_id": "row-4",
     "item_count": 30,
     "site_group": "group-b",
     "duplicate_items": 4
    }
   ],
   "maxItems": 200,
   "minItems": 1
  },
  "field": {
   "enum": [
    "item_count",
    "duplicate_items"
   ],
   "type": "string",
   "default": "item_count"
  },
  "base_index": {
   "type": "integer",
   "default": 0,
   "maximum": 199,
   "minimum": 0
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/feed-observations-base-100-series-and-secondary-measure-weighted-mean-6be03e96/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)