# HALOWERK Central Land – Slovenia Soil Clay Fraction (0–5 cm)

> HALOWERK Central Land – Slovenia Soil Clay Fraction (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 clay fraction for the 0–5 cm soil layer at a given WGS84 coordinate within Slovenia, validated against Natural Earth boundaries.

## Facts

- Endpoint: POST https://mitteleuropa.halowerk.com/v1/si-soil-clay
- 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-slovenia-soil-clay-fraction-0-5-cm-245d1085
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_ib0xBX1LeBvqRvUI0GBFt

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-slovenia-soil-clay-fraction-0-5-cm-245d1085 -d '<json body>'
```

Example prompt: What's the mean clay fraction in the top 5 cm of soil at latitude 46.07, longitude 14.51 in Slovenia? I need the SoilGrids value for that exact point.

## When to prefer this

Choose this endpoint when you need point-level, SoilGrids-derived topsoil clay fraction data specifically for locations in Slovenia, particularly for agricultural planning, geotechnical screening, or environmental analysis. It is ideal when you need a cost-efficient, pay-per-call lookup with built-in boundary validation that guarantees results are within Slovenia rather than relying on caller-side filtering.

## Known failure modes

- Coordinate outside Slovenia boundary — request rejected before payment
- Latitude or longitude out of European coverage range (lat 34–72.5, lon -31.5–40.5) — validation error
- Malformed request body or missing latitude/longitude fields — 400 error
- SoilGrids upstream data unavailable or timeout — 503 error
- Payment not completed or insufficient USDC — 402 error

## How this service works

Mean SoilGrids clay fraction for the 0-5 cm layer. The coordinate is validated against the Natural Earth boundary for Slovenia; results outside it are rejected before payment.

## Output

A numeric value representing the mean clay fraction (as a proportion or percentage) for the 0–5 cm soil depth at the queried coordinate, sourced from SoilGrids global soil data, covering only locations within Slovenia's Natural Earth boundary.

## 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-slovenia-soil-clay-fraction-0-5-cm-245d1085/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)