# HALOWERK Central Land – Slovakia Soil Coarse-Fragment Volume (0-5 cm)

> HALOWERK Central Land – Slovakia Soil Coarse-Fragment Volume (0-5 cm) is a paid API for AI agents from mitteleuropa.halowerk.com, paid per call via x402, $0.004/call, status unknown (last checked 2026-09-13).

Returns the mean SoilGrids coarse-fragment volume (volumetric %) for the 0–5 cm topsoil layer at a given WGS84 coordinate within Slovakia.

## Facts

- Endpoint: POST https://mitteleuropa.halowerk.com/v1/sk-soil-coarse-fragments
- Price: $0.004/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/halowerk-central-land-slovakia-soil-coarse-fragment-volume-0-5-cm-3562cde2
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_gP-hQO-QkAUoMcTsKf2hi

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-central-land-slovakia-soil-coarse-fragment-volume-0-5-cm-3562cde2 -d '<json body>'
```

Example prompt: What's the mean coarse-fragment volume in the top 5 cm of soil at latitude 48.71, longitude 19.15 in Slovakia? I need the SoilGrids value for that point.

## When to prefer this

Use this endpoint when you need soil coarse-fragment (gravel/stone fraction) data specifically for the 0–5 cm topsoil layer at a precise coordinate within Slovakia. Prefer it over general GIS queries when you want a ready-to-use numeric value from SoilGrids without handling raw raster files yourself. It is ideal for enriching agricultural, construction, or environmental datasets with a single per-point API call. For other soil properties (pH, silt, etc.) or other Central European countries, use the sibling endpoints on the same platform.

## Known failure modes

- Coordinate outside Slovakia boundary: rejected before payment with a boundary validation error
- Coordinate outside the broader European coverage (lat 34–72.5, lon -31.5–40.5): rejected with range error
- Missing or malformed latitude/longitude fields: returns a schema validation error
- SoilGrids data unavailable for the specific point (e.g. water body): may return null or an error indicating no data
- Network timeout: occasional slow response if upstream SoilGrids service is slow

## How this service works

Mean SoilGrids coarse-fragment volume for the 0-5 cm layer. The coordinate is validated against the Natural Earth boundary for Slovakia; results outside it are rejected before payment.

## Output

A numeric value representing the mean volumetric coarse-fragment percentage (stones, gravel, etc.) in the 0–5 cm soil layer at the queried coordinate, derived from SoilGrids. The coordinate is validated against the Natural Earth boundary for Slovakia; requests outside Slovakia are rejected before any charge is applied.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "latitude": {
   "type": "number",
   "maximum": 72.5,
   "minimum": 34,
   "description": "WGS84 latitude inside the published European coverage."
  },
  "longitude": {
   "type": "number",
   "maximum": 40.5,
   "minimum": -31.5,
   "description": "WGS84 longitude inside the published European coverage."
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/halowerk-central-land-slovakia-soil-coarse-fragment-volume-0-5-cm-3562cde2/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from mitteleuropa.halowerk.com](https://www.zero.xyz/host/mitteleuropa.halowerk.com/llms.txt)