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

> HALOWERK Central Land – Slovakia 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 SoilGrids total nitrogen concentration for the 0–5 cm soil layer at a given coordinate within Slovakia.

## Facts

- Endpoint: POST https://mitteleuropa.halowerk.com/v1/sk-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-slovakia-soil-nitrogen-0-5-cm-e44a120f
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_WGUCQAx8FDwStWADbzaxT

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-slovakia-soil-nitrogen-0-5-cm-e44a120f -d '<json body>'
```

Example prompt: What's the mean total nitrogen in the top 5 cm of soil at latitude 48.7 and longitude 19.1 in Slovakia? I need the SoilGrids figure for that layer.

## When to prefer this

Use this endpoint when you specifically need SoilGrids total nitrogen data for the surface soil layer (0–5 cm) at a point in Slovakia. It is ideal for agricultural planning, environmental assessments, or soil science workflows scoped to Slovak territory. For other soil properties (pH, silt, CEC) or other countries, use the sibling endpoints on the same platform. Prefer this over generic soil APIs when you need boundary-validated, pay-per-call precision with no subscription overhead.

## Known failure modes

- Coordinate outside Slovakia boundary — request rejected before payment, error indicating point is outside coverage area
- Coordinate within European coverage bounding box but outside Slovakia — rejected by boundary validation
- Invalid latitude or longitude values outside the European range (lat 34–72.5, lon -31.5–40.5) — schema validation error
- Malformed request body — missing required latitude or longitude fields returns a validation error
- Service unavailability or upstream SoilGrids data retrieval failure — may return a 5xx error

## How this service works

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

## Output

A numeric value representing the mean total nitrogen concentration (from SoilGrids) in the 0–5 cm soil layer at the requested coordinate. The coordinate is validated against Slovakia's Natural Earth boundary; requests outside Slovakia 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-central-land-slovakia-soil-nitrogen-0-5-cm-e44a120f/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)