# HALOWERK Eastern Land – Croatia Soil Coarse-Fragment Volume (0-5 cm)

> HALOWERK Eastern Land – Croatia Soil Coarse-Fragment Volume (0-5 cm) is a paid API for AI agents from ostland.halowerk.com, paid per call via x402, $0.004/call, status unknown (last checked 2026-09-15).

Returns the mean SoilGrids coarse-fragment volume (volumetric %) for the 0–5 cm soil layer at a given coordinate validated to lie within Croatia.

## Facts

- Endpoint: POST https://ostland.halowerk.com/v1/hr-soil-coarse-fragments
- Price: $0.004/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/halowerk-eastern-land-croatia-soil-coarse-fragment-volume-0-5-cm-ac24e115
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_NHEZ26MnchxBenAK--HKM

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-eastern-land-croatia-soil-coarse-fragment-volume-0-5-cm-ac24e115 -d '<json body>'
```

Example prompt: What's the coarse-fragment volume of the topsoil (0–5 cm layer) at latitude 45.8150, longitude 15.9819 in Croatia? Use the SoilGrids-based lookup.

## When to prefer this

Choose this endpoint when you need SoilGrids coarse-fragment volume specifically for a location within Croatia and want built-in boundary validation to ensure the coordinate is valid before payment. Prefer it over generic SoilGrids APIs when working with Croatian geospatial pipelines and needing a lightweight, pay-per-call lookup without provisioning your own geospatial infrastructure.

## Known failure modes

- Coordinate outside Croatia boundary – request rejected before payment is charged
- Coordinate within European coverage range but outside Croatia – validation rejection
- Invalid latitude/longitude values outside the allowed European range (lat 34–72.5, lon -31.5–40.5) – schema validation error
- Network or upstream SoilGrids data unavailability – service error response
- Missing required latitude or longitude fields – request schema error

## 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 Croatia; results outside it are rejected before payment.

## Output

A numeric value representing the mean volumetric coarse-fragment content (expressed as a percentage or cm³/dm³) for the 0–5 cm soil depth at the queried coordinate, sourced from SoilGrids and validated to fall within Croatia'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-eastern-land-croatia-soil-coarse-fragment-volume-0-5-cm-ac24e115/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from ostland.halowerk.com](https://www.zero.xyz/host/ostland.halowerk.com/llms.txt)