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

> HALOWERK Central Land – Austria 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 soil layer at a given WGS84 coordinate within Austria.

## Facts

- Endpoint: POST https://mitteleuropa.halowerk.com/v1/at-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-austria-soil-nitrogen-0-5-cm-9ff1fa55
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_7nw5bVedxNCwzSmEuoWk9

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-austria-soil-nitrogen-0-5-cm-9ff1fa55 -d '<json body>'
```

Example prompt: What's the mean total nitrogen concentration in the top 5 cm of soil at latitude 47.8 and longitude 13.05 in Austria?

## When to prefer this

Choose this endpoint when you need point-level topsoil (0–5 cm) total nitrogen data specifically within Austria, validated against official country boundaries. It is ideal for precision agriculture, soil health assessments, and environmental monitoring workflows focused on Austrian land. Prefer it over generic global soil APIs when Austria-specific boundary enforcement and per-call micropayment pricing are acceptable.

## Known failure modes

- Coordinate outside Austria boundary — request rejected before processing
- Latitude or longitude outside the accepted European coverage range (lat 34–72.5, lon -31.5–40.5) — validation error
- Malformed request body or missing required fields — 400 error
- Payment not completed or insufficient USDC balance — 402 payment required
- Temporary upstream SoilGrids data unavailability — 503 or timeout

## How this service works

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

## Output

A numeric mean total nitrogen value for the 0–5 cm soil layer at the queried coordinate, sourced from SoilGrids global soil data. The coordinate is validated against Austria's Natural Earth boundary before the result is returned; requests falling outside Austria are rejected.

## 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-austria-soil-nitrogen-0-5-cm-9ff1fa55/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)