# HALOWERK Eastern Land – Croatia Soil Bulk Density (0–5 cm)

> HALOWERK Eastern Land – Croatia Soil Bulk Density (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 bulk density for the 0–5 cm soil layer at a given coordinate within Croatia, validated against the Natural Earth boundary.

## Facts

- Endpoint: POST https://ostland.halowerk.com/v1/hr-soil-bulk-density
- 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-bulk-density-0-5-cm-92386afc
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_nM8kyRfHMnNEac1NBShxa

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-bulk-density-0-5-cm-92386afc -d '<json body>'
```

Example prompt: What's the mean soil bulk density for the 0–5 cm layer at latitude 45.815 and longitude 15.982 in Croatia?

## When to prefer this

Choose this endpoint when you specifically need SoilGrids mean bulk density for the 0–5 cm layer at a point within Croatia, especially when geographic boundary enforcement and per-call micropayment pricing ($0.004 USDC) are acceptable. Prefer it over general-purpose SoilGrids APIs when you want validated, Croatia-scoped results with built-in boundary rejection and x402 payment integration.

## Known failure modes

- Coordinate outside Croatia boundary → request rejected, no charge
- Latitude or longitude out of European coverage range (lat 34–72.5, lon -31.5–40.5) → validation error
- Missing required latitude or longitude → 400 Bad Request
- Payment failure or insufficient USDC balance → 402 Payment Required
- SoilGrids upstream data unavailable for coordinate → service error

## How this service works

Mean SoilGrids bulk density 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 SoilGrids bulk density for the 0–5 cm soil layer at the requested coordinate, in standard SoilGrids units (kg/dm³ or g/cm³). Coordinates outside the Croatia boundary are rejected before any charge is incurred.

## 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-bulk-density-0-5-cm-92386afc/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)