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

> HALOWERK Nordic Land – Norway 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 SoilGrids total nitrogen value for the 0–5 cm soil layer at a given coordinate within Norway, validated against Natural Earth boundaries.

## Facts

- Endpoint: POST https://nordland.halowerk.com/v1/no-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-norway-soil-nitrogen-0-5-cm-b8bc23a2
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Q09vJwyrZxBSW03AcdkQ_

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-norway-soil-nitrogen-0-5-cm-b8bc23a2 -d '<json body>'
```

Example prompt: What is the mean total nitrogen in the top 5 cm of soil at latitude 63.43 and longitude 10.39 in Norway? I need the SoilGrids figure for that spot.

## When to prefer this

Choose this endpoint when you need Norway-specific SoilGrids total nitrogen data for the 0–5 cm surface layer at a precise coordinate, and you want automatic out-of-bounds rejection (no charge for invalid coordinates). Prefer it over generic SoilGrids API access when you are building Norway-focused agricultural, environmental, or land-use applications that need per-call micropayment billing via x402. Use sibling endpoints on the same host for complementary soil properties (pH, organic carbon, texture, clay, sand, silt).

## Known failure modes

- Coordinate outside Norway boundary — request rejected before payment, returns error indicating the location is out of coverage
- Coordinate within European bounding box but outside Norway polygon — rejected by Natural Earth boundary validation
- Latitude or longitude outside the declared European coverage range (lat 34–72.5, lon -31.5–40.5) — input validation error
- No SoilGrids data available for the queried location — may return null or no-data indicator
- 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 Norway; results outside it are rejected before payment.

## Output

A numeric value representing the mean total nitrogen content (g/kg or cg/kg depending on SoilGrids convention) in the 0–5 cm soil layer at the requested coordinate. Coordinates outside Norway's Natural Earth 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-nordic-land-norway-soil-nitrogen-0-5-cm-b8bc23a2/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)