# HALOWERK Europe Land – Soil Sand Fraction (Parcel Polygon)

> HALOWERK Europe Land – Soil Sand Fraction (Parcel Polygon) 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 sand fraction for the 0–5 cm soil layer within a caller-supplied WGS84 polygon, covering 30 European countries.

## Facts

- Endpoint: POST https://euroland.halowerk.com/v1/europe-soil-sand-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-soil-sand-fraction-parcel-polygon-79dfcee9
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_oIPdKRSSlQDLNR9MfxXW_

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-soil-sand-fraction-parcel-polygon-79dfcee9 -d '<json body>'
```

Example prompt: What's the mean sand fraction in the top 5 cm of soil for this plot? The parcel corners are at roughly [[-0.12, 51.50], [-0.11, 51.50], [-0.11, 51.51], [-0.12, 51.51]].

## When to prefer this

Choose this endpoint when you need parcel-level mean topsoil sand fraction for a custom polygon boundary in Europe, particularly when working with SoilGrids-standardized data across multiple countries. Prefer this over point-based or fixed-radius variants when you have an exact land parcel geometry and need an area-aggregated result rather than a local buffer estimate.

## Known failure modes

- Polygon spans more than 0.25 degrees — request rejected with validation error
- Fewer than 3 coordinate pairs supplied — invalid polygon error
- Coordinates fall outside the 30-country European coverage area — out-of-bounds error
- Polygon self-intersects or is malformed — geometry validation failure
- Payment not attached or insufficient — HTTP 402 payment required

## How this service works

Mean SoilGrids sand fraction 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 sand fraction value (likely as a percentage or volumetric fraction) for the 0–5 cm topsoil layer within the supplied polygon, derived from SoilGrids global soil data, covering any of 30 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-soil-sand-fraction-parcel-polygon-79dfcee9/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)