# HALOWERK Eastern Land – Hungary Soil Total Nitrogen (0-5 cm)

> HALOWERK Eastern Land – Hungary Soil Total Nitrogen (0-5 cm) is a paid API for AI agents from ostland.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 topsoil layer at a given WGS84 coordinate within Hungary.

## Facts

- Endpoint: POST https://ostland.halowerk.com/v1/hu-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-eastern-land-hungary-soil-total-nitrogen-0-5-cm-507ba084
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_kTp0UGJPTuWkkVJllyyAp

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-eastern-land-hungary-soil-total-nitrogen-0-5-cm-507ba084 -d '<json body>'
```

Example prompt: What's the mean total nitrogen concentration in the top 0-5 cm of soil at latitude 47.49, longitude 19.04 in Hungary — can you pull that from SoilGrids?

## When to prefer this

Use this endpoint when you specifically need SoilGrids total nitrogen data for the 0-5 cm topsoil layer at a point location within Hungary. It is the right choice for precision agriculture, land evaluation, environmental assessments, or soil science workflows scoped to Hungarian territory. For other soil properties (e.g., cation exchange capacity, coarse fragment volume) or other countries, use the corresponding sibling endpoints on ostland.halowerk.com.

## Known failure modes

- Coordinate outside Hungary boundary: request rejected before payment with a boundary validation error
- Coordinate within European coverage range but outside Hungary: rejected by Natural Earth boundary check
- Latitude or longitude out of the European bounds (lat 34–72.5, lon -31.5–40.5): schema validation error
- Missing latitude or longitude: request rejected with a missing-parameter 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 Hungary; results outside it are rejected before payment.

## Output

A single numeric value representing the mean total nitrogen content (in g/kg or cg/kg per SoilGrids convention) for the 0-5 cm topsoil layer at the queried coordinate, derived from the SoilGrids dataset. The coordinate is validated against Hungary's Natural Earth boundary; coordinates outside Hungary are rejected before any charge is applied.

## 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-eastern-land-hungary-soil-total-nitrogen-0-5-cm-507ba084/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from ostland.halowerk.com](https://www.zero.xyz/host/ostland.halowerk.com/llms.txt)