# HALOWERK Southern Land – Malta Soil Nitrogen (0-5 cm)

> HALOWERK Southern Land – Malta Soil Nitrogen (0-5 cm) is a paid API for AI agents from suedland.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 topsoil layer at a given coordinate within Malta's boundaries.

## Facts

- Endpoint: POST https://suedland.halowerk.com/v1/mt-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-southern-land-malta-soil-nitrogen-0-5-cm-5fdc4745
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_LeHEpCJFCNpV7ZShaixi5

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-southern-land-malta-soil-nitrogen-0-5-cm-5fdc4745 -d '<json body>'
```

Example prompt: What is the mean total nitrogen in the top 5 cm of soil at latitude 35.89, longitude 14.45 in Malta? I need the SoilGrids value for that point.

## When to prefer this

Use this endpoint when you specifically need SoilGrids mean total nitrogen for the topsoil (0–5 cm) at a point within Malta. It is purpose-built for Malta's boundary and will reject out-of-bounds requests before charging, making it safe for automated pipelines. Prefer this over generic soil APIs when you need verified, boundary-constrained nitrogen data for Maltese agriculture, environmental assessment, or land-use planning.

## Known failure modes

- Coordinate outside Malta boundary — request rejected before payment with a boundary validation error
- Coordinate within European coverage bounds but outside Malta — rejected by country-level polygon check
- Missing or malformed latitude/longitude — validation error returned
- Coordinate in a sea or non-terrestrial area within the bounding box — may return null or error
- Service unavailable — upstream SoilGrids data temporarily inaccessible

## How this service works

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

## Output

A numeric value representing the mean SoilGrids total nitrogen in the 0–5 cm topsoil layer at the submitted coordinate. The coordinate is first validated against Malta's Natural Earth boundary; requests falling outside Malta are rejected without charge.

## 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-southern-land-malta-soil-nitrogen-0-5-cm-5fdc4745/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from suedland.halowerk.com](https://www.zero.xyz/host/suedland.halowerk.com/llms.txt)