# HALOWERK Nordic Land – Sweden Surface Soil Nitrogen

> HALOWERK Nordic Land – Sweden Surface Soil Nitrogen 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 (g/kg) from SoilGrids for the 0–5 cm topsoil layer at a given coordinate within Sweden.

## Facts

- Endpoint: POST https://nordland.halowerk.com/v1/se-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-sweden-surface-soil-nitrogen-79c75fd9
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_fXNSt8Eyzq1FYCLkPazaR

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-sweden-surface-soil-nitrogen-79c75fd9 -d '<json body>'
```

Example prompt: What's the mean total nitrogen in the top 5 cm of soil at latitude 57.7 and longitude 11.97 in Sweden?

## When to prefer this

Choose this endpoint when you need point-level surface soil nitrogen data specifically for locations in Sweden, validated against official boundaries. Prefer it over generic SoilGrids API access when you want boundary-enforced queries with predictable per-call pricing, or when building agentic workflows that need reliable soil nutrient lookup within a Swedish geographic scope.

## Known failure modes

- Coordinate outside Sweden boundary — rejected before payment with a geographic validation error
- Coordinate within broad European input range but outside Sweden — returns rejection, no charge
- Latitude or longitude out of the declared European bounds (lat 34–72.5, lon -31.5–40.5) — schema validation error
- SoilGrids data unavailable for remote or coastal edge coordinates — may return null or no-data value
- Malformed request body — returns 400-level 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 Sweden; results outside it are rejected before payment.

## Output

A numeric value representing the mean total nitrogen content in g/kg (or equivalent SoilGrids units) for the 0–5 cm topsoil layer at the queried coordinate within Sweden. The response is only returned if the coordinate falls within Sweden's Natural Earth boundary.

## 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-sweden-surface-soil-nitrogen-79c75fd9/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)