# HALOWERK Eastern Land – Croatia Soil Sand Fraction (0–5 cm)

> HALOWERK Eastern Land – Croatia Soil Sand Fraction (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 sand fraction for the 0–5 cm soil layer at a given WGS84 coordinate validated to fall within Croatia's boundary.

## Facts

- Endpoint: POST https://ostland.halowerk.com/v1/hr-soil-sand
- 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-sand-fraction-0-5-cm-258fe081
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_xYqXRxDPSd91QNIJrlGcF

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-sand-fraction-0-5-cm-258fe081 -d '<json body>'
```

Example prompt: What's the mean sand fraction in the top 5 cm of soil at latitude 45.81 and longitude 15.98 in Croatia?

## When to prefer this

Use this endpoint when you need SoilGrids sand fraction data specifically for a location within Croatia and require coordinate validation against an authoritative boundary before incurring costs. Prefer this over generic SoilGrids queries when working with Croatian agricultural, environmental, or land-use applications that need guaranteed geographic scoping.

## Known failure modes

- Coordinate outside Croatia's validated boundary — request rejected before payment with a geographic validation error
- Coordinate within European bounding box but outside Croatia — rejected by Natural Earth boundary check
- Missing or malformed latitude/longitude — returns a validation error
- Coordinates at extreme precision or at boundary edge may trigger edge-case rejection

## How this service works

Mean SoilGrids sand fraction 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

Returns the mean sand fraction (as a proportion or percentage) for the 0–5 cm soil depth layer at the requested coordinate, sourced from SoilGrids data. Coordinates outside Croatia's Natural Earth boundary are rejected before payment is processed.

## 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-sand-fraction-0-5-cm-258fe081/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)