# HALOWERK Eastern Land – Romania Soil Nitrogen (0–5 cm)

> HALOWERK Eastern Land – Romania Soil 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 depth layer at a given WGS84 coordinate within Romania.

## Facts

- Endpoint: POST https://ostland.halowerk.com/v1/ro-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-romania-soil-nitrogen-0-5-cm-0ac1eec6
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_c7VEXyCpYfjJSjq_K4m9R

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-romania-soil-nitrogen-0-5-cm-0ac1eec6 -d '<json body>'
```

Example prompt: What's the mean total nitrogen in the top 5 cm of soil at latitude 45.85, longitude 24.97 in Romania?

## When to prefer this

Use this endpoint when you need SoilGrids total nitrogen data specifically for a point location within Romania at the 0–5 cm depth layer. It is ideal for precision agriculture, land valuation, soil health monitoring, or environmental research workflows targeting Romanian coordinates. It is not suitable for coordinates outside Romania or for other soil properties (use sibling endpoints for CEC, silt fraction, or slope metrics).

## Known failure modes

- Coordinate outside Romania boundary — request rejected before payment, error indicating invalid location
- Coordinate within European coverage range but outside Romania — boundary validation failure
- Malformed latitude or longitude values outside WGS84 European bounds (lat 34–72.5, lon -31.5–40.5) — schema validation error
- No SoilGrids data available for the queried point — null or missing data response
- Payment failure via x402 protocol — call not processed

## How this service works

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

## Output

A numeric value representing the mean total nitrogen (from SoilGrids) for the 0–5 cm topsoil layer at the queried coordinate. The coordinate is validated against Romania's Natural Earth boundary; requests outside Romania are rejected before 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-eastern-land-romania-soil-nitrogen-0-5-cm-0ac1eec6/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)