# Cache Observations – Adjacent Row Changes

> Cache Observations – Adjacent Row Changes is a paid API for AI agents from market.datapackvibe.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-19).

Computes adjacent (period-over-period) row changes for cache hit/miss observation data, returning a bounded descriptive analytics report for up to 200 records.

## Facts

- Endpoint: POST https://market.datapackvibe.com/x402/assistant-ar-analytics-cache-observations-period-change?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-19
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/cache-observations-adjacent-row-changes-02e65828
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_sr-5VQSk73zvuR1j-U2PF

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-adjacent-row-changes-02e65828 -d '<json body>'
```

Example prompt: Can you run an adjacent row changes report on my cache observations — I have 4 rows with dates 2026-10-01 through 2026-10-04, cache groups 'group-a' and 'group-b', hits of 10, 20, 15, 30 and misses of 1, 2, 3, 4, and I want to analyze the hits field?

## When to prefer this

Choose this endpoint when you need a quick, local, period-over-period delta report on cache hit or miss timeseries data without any enrichment, forecasting, or external data dependencies. It is ideal for lightweight analytical pipelines where you supply up to 200 typed cache observation records and only need adjacent row change values at minimal cost ($0.01 USDC).

## Known failure modes

- Fewer than 1 row supplied — minItems validation failure
- More than 200 rows supplied — maxItems exceeded
- Missing required fields (row_id, cache, date, hits, misses) on any record
- Invalid date format (must match YYYY-MM-DD pattern)
- Numeric values outside allowed range (±1,000,000,000,000)
- Invalid field enum value (must be 'hits' or 'misses')
- Payment not fulfilled — x402 payment required before response

## How this service works

Cache observations - Adjacent row changes: Adjacent row changes 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 adjacent row changes report.

## Output

A bounded descriptive analytics report showing the computed adjacent (row-to-row) change values for the selected metric field (hits or misses) across the supplied cache observation records, with no forecasting or external enrichment applied.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "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-adjacent-row-changes-02e65828/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)