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

> HALOWERK Central Land – Czechia 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 2026-09-15).

Returns the mean SoilGrids total nitrogen concentration for the 0–5 cm topsoil layer at a given WGS84 coordinate validated against the Czechia boundary.

## Facts

- Endpoint: POST https://mitteleuropa.halowerk.com/v1/cz-soil-nitrogen
- 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-central-land-czechia-soil-nitrogen-0-5-cm-8af91c68
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_B8BzCQSGwS0UQ34p4Z5jK

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-czechia-soil-nitrogen-0-5-cm-8af91c68 -d '<json body>'
```

Example prompt: What's the mean total nitrogen in the top 5 cm of soil at latitude 50.0755, longitude 14.4378 in Czechia? I need it for a soil health assessment.

## When to prefer this

Use this endpoint when you need SoilGrids total nitrogen specifically for the 0–5 cm topsoil layer at a point location within Czechia. It is preferable when geographic validation against official Czechia boundaries is required before incurring cost. Choose sibling endpoints on the same host for other soil properties (pH, silt, CEC) or other geographic layers.

## Known failure modes

- Coordinate outside Czechia boundary: request rejected, no charge applied
- Latitude or longitude outside European coverage range (lat 34–72.5, lon -31.5–40.5): validation error
- Missing required latitude or longitude parameter: schema validation error
- Network or upstream SoilGrids data unavailability: service error response

## How this service works

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

## Output

Returns the mean SoilGrids total nitrogen value (in g/kg or cg/kg, per SoilGrids convention) for the 0–5 cm depth layer at the queried coordinate. Coordinates outside the Czechia boundary are rejected before any 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-central-land-czechia-soil-nitrogen-0-5-cm-8af91c68/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)