# Cache Observations Equal-Width Histogram

> Cache Observations 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 2026-10-18).

Computes an equal-width histogram over cache hit or miss counts from up to 200 typed cache observation records, returning a local descriptive analytics report.

## Facts

- Endpoint: POST https://market.datapackvibe.com/x402/assistant-ar-analytics-cache-observations-histogram?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-18
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/cache-observations-equal-width-histogram-f8cc959e
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_DkOr-hnIM0Ge2yMvJfM5E

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 cache-observations-equal-width-histogram-f8cc959e -d '<json body>'
```

Example prompt: Take these 4 cache observation records — row-1 on 2026-10-01 with 10 hits and 1 miss for group-a, row-2 on 2026-10-02 with 20 hits and 2 misses for group-b, row-3 on 2026-10-03 with 15 hits and 3 misses for group-a, row-4 on 2026-10-04 with 30 hits and 4 misses for group-b — and give me an equal-width histogram over the hits field using 5 bins.

## When to prefer this

Choose this endpoint when you have raw cache observation records (hits and misses by date and cache group) and need a quick, local equal-width histogram without any external data enrichment, forecasting, or machine learning. It is ideal for operational dashboards, SRE reviews, or any workflow needing a deterministic frequency distribution of cache metrics at low cost ($0.01 USDC per call) on datasets up to 200 records.

## Known failure modes

- Fewer than 1 or more than 200 rows submitted — request rejected
- Invalid date format (not YYYY-MM-DD) on any row — validation error
- Bins parameter outside 1–30 range — rejected
- Missing required fields (row_id, cache, date, hits, misses) on any row — schema error
- Field value not one of 'hits' or 'misses' — enum validation error
- Numeric values outside ±1,000,000,000,000 range — rejected

## How this service works

Cache observations - Equal-width histogram: Equal-width histogram for Cache observations. Up to 200 supplied typed records. Local descriptive analytics; no enrichment or forecast. One of 25 new profiles across 20 shared operations in this industry. 0.01 USDC includes one bounded equal-width histogram report.

## Output

A bounded equal-width histogram report showing bin boundaries and the frequency of cache observations (hits or misses) falling into each bin, derived entirely from the supplied records with no external enrichment or forecasting.

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

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/cache-observations-equal-width-histogram-f8cc959e/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)