# HALOWERK Central Land – Slovenia Soil Nitrogen (0-5 cm)

> HALOWERK Central Land – Slovenia Soil Nitrogen (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 total nitrogen content (from SoilGrids) for the 0-5 cm soil layer at a given WGS84 coordinate within Slovenia.

## Facts

- Endpoint: POST https://mitteleuropa.halowerk.com/v1/si-soil-nitrogen
- 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-nitrogen-0-5-cm-b6aa4bb2
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_y6HO-vEnM3p4tBeOAONe5

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-nitrogen-0-5-cm-b6aa4bb2 -d '<json body>'
```

Example prompt: What is the mean total nitrogen in the top 5 cm of soil at latitude 46.05, longitude 14.50 in Slovenia?

## When to prefer this

Use this endpoint when you need topsoil (0-5 cm) total nitrogen data specifically for a coordinate within Slovenia and require automatic boundary validation to avoid wasted calls. It is ideal for agricultural analysis, soil health assessments, or geospatial enrichment pipelines scoped to Slovenia. Prefer this over general SoilGrids API access when you want a pay-per-call micropayment model with built-in geographic guardrails.

## Known failure modes

- Coordinate outside Slovenia boundary: request rejected before payment with a boundary validation error
- Coordinate outside overall European coverage range (lat 34–72.5, lon -31.5–40.5): rejected with validation error
- Missing or malformed latitude/longitude fields: returns a schema validation error
- SoilGrids upstream data unavailable: may return a service error or null value

## How this service works

Mean SoilGrids total nitrogen 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 total nitrogen concentration in the 0-5 cm soil layer at the queried coordinate, sourced from SoilGrids, expressed in standard soil nitrogen units (cg/kg or equivalent). Only coordinates validated as falling within Slovenia's Natural Earth boundary are accepted; out-of-bounds coordinates 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-slovenia-soil-nitrogen-0-5-cm-b6aa4bb2/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)