# HALOWERK Europe Land – Parcel Soil pH (0–5 cm)

> HALOWERK Europe Land – Parcel Soil pH (0–5 cm) is a paid API for AI agents from euroland.halowerk.com, paid per call via x402, $0.006/call, status unknown (last checked 2026-09-15).

Returns the mean SoilGrids pH in H2O for the 0–5 cm topsoil layer within a caller-supplied WGS84 polygon, covering 30 European countries.

## Facts

- Endpoint: POST https://euroland.halowerk.com/v1/europe-soil-ph-parcel
- Price: $0.006/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/halowerk-europe-land-parcel-soil-ph-0-5-cm-d8b6f43e
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Ihn1bRzJUBwvt3dLyWQH0

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 halowerk-europe-land-parcel-soil-ph-0-5-cm-d8b6f43e -d '<json body>'
```

Example prompt: What's the mean topsoil pH for my vineyard in Burgundy? The parcel corners are roughly at [4.85, 47.12], [4.87, 47.12], [4.87, 47.11], [4.85, 47.11] — I need the SoilGrids 0–5 cm H2O pH reading.

## When to prefer this

Choose this endpoint when you need standardized SoilGrids topsoil pH data for a precise, user-defined polygon boundary within Europe — especially for agricultural due diligence, precision farming, environmental assessments, or land valuation workflows where a parcel-level (rather than circular buffer) query is required. Prefer this over point-based or circular-buffer soil APIs when exact cadastral or field boundaries are available.

## Known failure modes

- Polygon exceeds 0.25-degree maximum span — returns validation error
- Fewer than 3 coordinate pairs provided — polygon invalid
- Coordinates outside supported European bounding box (lon: -31.5 to 40.5, lat: 34 to 72.5) — out-of-coverage error
- Malformed coordinate array (non-numeric values, wrong nesting) — schema validation failure
- No SoilGrids data available for very remote or island areas — may return null or empty result

## How this service works

Mean SoilGrids pH in H2O for the 0-5 cm layer. The service evaluates the bounded polygon supplied by the caller and returns standardized units across all 30 covered countries.

## Output

A standardized mean soil pH value (H2O method) for the 0–5 cm depth layer, aggregated over all SoilGrids raster pixels falling within the submitted polygon. The result is consistent across all 30 covered European countries.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "polygon": {
   "type": "array",
   "items": {
    "type": "array",
    "items": [
     {
      "type": "number",
      "maximum": 40.5,
      "minimum": -31.5
     },
     {
      "type": "number",
      "maximum": 72.5,
      "minimum": 34
     }
    ],
    "maxItems": 2,
    "minItems": 2,
    "additionalItems": false
   },
   "maxItems": 100,
   "minItems": 3,
   "description": "WGS84 polygon ring. The closing coordinate is optional; maximum span is 0.25 degrees."
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/halowerk-europe-land-parcel-soil-ph-0-5-cm-d8b6f43e/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from euroland.halowerk.com](https://www.zero.xyz/host/euroland.halowerk.com/llms.txt)