# Tree Canopy Observations — Adjacent Row Changes + Equal-Width Histogram

> Tree Canopy Observations — Adjacent Row Changes + 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 2026-10-26).

Computes adjacent row-to-row changes and an equal-width frequency histogram for tree canopy observation records (canopy_m2 and plot_m2) over up to 200 rows.

## Facts

- Endpoint: POST https://market.datapackvibe.com/x402/assistant-ib26-weather-17-156?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-26
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/tree-canopy-observations-adjacent-row-changes-equal-width-histogram-a82c1308
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_y52LB9jcB0JeLDHTLrmPg

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 tree-canopy-observations-adjacent-row-changes-equal-width-histogram-a82c1308 -d '<json body>'
```

Example prompt: Run adjacent row change analysis and an equal-width histogram with 10 bins on my canopy_m2 field for these tree canopy observations: row-1 on 2026-10-01 in group-a has canopy_m2=150 and plot_m2=500, row-2 on 2026-10-02 in group-a has canopy_m2=180 and plot_m2=510, and row-3 on 2026-10-03 in group-b has canopy_m2=120 and plot_m2=490.

## When to prefer this

Choose this endpoint when you have raw tree canopy observation records (with canopy_m2 and plot_m2 fields) and need both a sequential change analysis and a distribution histogram in a single cheap call. Ideal for preprocessing environmental or forestry survey data before visualization or reporting. Not suitable if you need live canopy data fetching, geospatial lookups, predictive modeling, or professional ecological assessment.

## Known failure modes

- More than 200 rows submitted — request will be rejected or truncated
- Missing required fields (row_id, date, canopy_m2, plot_m2) cause validation errors
- Invalid date format (not YYYY-MM-DD) triggers schema validation failure
- bins value outside 1–30 range is rejected
- Null numeric values may produce gaps or NaN deltas in the adjacent-row report
- Payment of 0.01 USDC not attached or fails — request not processed

## How this service works

Tree canopy observations — Adjacent row changes + Equal-width histogram: Adjacent row changes + Equal-width histogram for supplied tree canopy observations records (canopy_m2, plot_m2). 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) an adjacent row changes report showing the delta between consecutive canopy_m2 (or plot_m2) values row by row, and (2) an equal-width histogram breaking the chosen field into the specified number of bins with frequency counts — all computed locally on the supplied data, 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",
     "station_group",
     "date",
     "canopy_m2",
     "plot_m2"
    ],
    "properties": {
     "date": {
      "type": "string",
      "default": "",
      "pattern": "^\\d{4}-\\d{2}-\\d{2}$",
      "maxLength": 10
     },
     "row_id": {
      "type": "string",
      "default": "",
      "maxLength": 80,
      "minLength": 1
     },
     "plot_m2": {
      "type": [
       "number",
       "null"
      ],
      "maximum": 1000000000000,
      "minimum": -1000000000000
     },
     "canopy_m2": {
      "type": [
       "number",
       "null"
      ],
      "maximum": 1000000000000,
      "minimum": -1000000000000
     },
     "station_group": {
      "type": "string",
      "default": "",
      "maxLength": 80
     }
    },
    "additionalProperties": false
   },
   "default": [
    {
     "date": "2026-10-01",
     "row_id": "row-1",
     "plot_m2": 1,
     "canopy_m2": 10,
     "station_group": "group-a"
    },
    {
     "date": "2026-10-02",
     "row_id": "row-2",
     "plot_m2": 2,
     "canopy_m2": 20,
     "station_group": "group-b"
    },
    {
     "date": "2026-10-03",
     "row_id": "row-3",
     "plot_m2": 3,
     "canopy_m2": 15,
     "station_group": "group-a"
    },
    {
     "date": "2026-10-04",
     "row_id": "row-4",
     "plot_m2": 4,
     "canopy_m2": 30,
     "station_group": "group-b"
    }
   ],
   "maxItems": 200,
   "minItems": 1
  },
  "field": {
   "enum": [
    "canopy_m2",
    "plot_m2"
   ],
   "type": "string",
   "default": "canopy_m2"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/tree-canopy-observations-adjacent-row-changes-equal-width-histogram-a82c1308/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)