# HALOWERK Nordic Land – Denmark Soil Nitrogen (0–5 cm)

> HALOWERK Nordic Land – Denmark Soil Nitrogen (0–5 cm) is a paid API for AI agents from nordland.halowerk.com, paid per call via x402, $0.004/call, status unknown (last checked 2026-09-15).

Returns the mean total nitrogen content (from SoilGrids) for the 0–5 cm soil layer at a given coordinate within Denmark.

## Facts

- Endpoint: POST https://nordland.halowerk.com/v1/dk-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-nordic-land-denmark-soil-nitrogen-0-5-cm-d58d3ea4
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_r6mxVizuyx-VlHsHb-ClD

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-nordic-land-denmark-soil-nitrogen-0-5-cm-d58d3ea4 -d '<json body>'
```

Example prompt: What's the mean total nitrogen in the top 5 cm of soil at latitude 55.676, longitude 12.568 in Denmark — I need the SoilGrids figure for that spot.

## When to prefer this

Use this endpoint when you need point-level SoilGrids total nitrogen data specifically for a location within Denmark. It is ideal for precision agriculture, soil health assessments, environmental monitoring, and land-use planning workflows where nitrogen at the topsoil (0–5 cm) layer is required. Prefer this over generic SoilGrids API access when you want a lightweight, pay-per-call integration with built-in Danish boundary validation.

## Known failure modes

- Coordinate outside Denmark's Natural Earth boundary — request rejected before payment is processed
- Latitude or longitude outside the European coverage range (lat 34–72.5, lon -31.5–40.5) — validation error
- Malformed or missing coordinate fields — schema validation error
- SoilGrids data unavailable for requested point — null or error response
- Network timeout or upstream SoilGrids service unavailability

## How this service works

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

## Output

Returns the mean SoilGrids total nitrogen value for the 0–5 cm soil layer at the specified coordinate. The value is derived from the SoilGrids dataset and represents nitrogen content for the surface soil horizon. Coordinates outside Denmark's Natural Earth boundary are rejected before processing.

## 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-nordic-land-denmark-soil-nitrogen-0-5-cm-d58d3ea4/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from nordland.halowerk.com](https://www.zero.xyz/host/nordland.halowerk.com/llms.txt)